Contents
1 How Credit Cards work 
1.1 Grace period 
1.2 The merchant's side 
1.3 Secured credit cards 
2 Features 
3 Security 
4 Profits and losses 
4.1 Costs 
4.1.1 Interest expenses 
4.1.2 Operating costs 
4.1.3 Charge offs 
4.1.4 Rewards 
4.1.5 Fraud 
4.2 Revenues 
4.2.1 Interchange fees 
4.2.2 Contract terms 
4.2.3 Industry's jargon for customer categories 
4.2.4 Interest on outstanding balances 
4.2.5 Fees charged to customers 
5 Neutral consumer resources 
5.1 Canada 
6 History 
7 Controversy 
7.1 Minimum payments 
7.2 Trailing interest 
8 Credit card numbering 
9 Credit cards in ATMs 
10 Credit card networks 
11 Credit cards as funding for entrepreneurs 
12 Collectable credit cards 
13 References 
14 See also 
15 External links 
15.1 Consumer advice 
15.2 Merchant advice 

How Credit Cards work
A user is issued a credit card after an account has been approved by the credit provider (often a general bank, but sometimes a captive bank created to issue a particular brand of credit card, such as Wells Fargo or American Express Centurion Bank), with which the user will be able to make purchases from merchants accepting that credit card up to a pre-established credit limit.

When a purchase is made, the credit card user agrees to pay the card issuer. The cardholder indicates their consent to pay, by signing a receipt with a record of the card details and indicating the amount to be paid or by entering a PIN. Also, many merchants now accept verbal authorizations via telephone and electronic authorization using the Internet, known as a customer not present (CNP) transaction.

Electronic verification systems allow merchants to verify that the card is valid and the credit card customer has sufficient credit to cover the purchase in a few seconds, allowing the verification to happen at time of purchase. The verification is performed using a credit card payment terminal or Point of Sale (POS) system with a communications link to the merchant's acquiring bank. Data from the card is obtained using from a magnetic stripe or chip on the card; the later system is commonly known as Chip and PIN, but is more technically an EMV card.

Other variations of verification systems are used by eCommerce merchants to determine if the user's account is valid and able to accept the charge. These will typically involve the cardholder providing additional information, such as the security code printed on the back of the card, or the address of the cardholder.

Each month, the credit card user is sent a statement indicating the purchases undertaken with the card, any outstanding fees, and the total amount owed. After receiving the statement, the cardholder may dispute any charges that he or she thinks are incorrect (see Fair Credit Billing Act for details of the US regulations). Otherwise, the cardholder must pay a defined minimum proportion of the bill by a due date, or may choose to pay a higher amount up to the entire amount owed. The credit provider charges interest on the amount owed (typically at a much higher rate than most other forms of debt). Some financial institutions can arrange for automatic payments to be deducted from the user's accounts.

Credit card issuers usually waive interest charges if the balance is paid in full each month, but typically will charge full interest on the entire outstanding balance from the date of each purchase if the total balance is not paid.

For example, if a user had a $1,000 outstanding balance and pays it in full, there would be no interest charged. If, however, even $1.00 of the total balance remained unpaid, interest would be charged on the full $1,000 from the date of purchase until the payment is received. The precise manner in which interest is charged is usually detailed in a cardholder agreement which may be summarized on the back of the monthly statement.

The credit card may simply serve as a form of revolving credit, or it may become a complicated financial instrument with multiple balance segments each at a different interest rate, possibly with a single umbrella credit limit, or with separate credit limits applicable to the various balance segments. Usually this compartmentalization is the result of special incentive offers from the issuing bank, either to encourage balance transfers from cards of other issuers, or to encourage more spending on the part of the customer. In the event that several interest rates apply to various balance segments, payment allocation is generally at the discretion of the issuing bank, and payments will therefore usually be allocated towards the lowest rate balances until paid in full before any money is paid towards higher rate balances. Interest rates can vary considerably from card to card, and the interest rate on a particular card may jump dramatically if the card user is late with a payment on that card or any other credit instrument, or even if the issueing bank decides to raise its revenue. As the rates and terms vary, services have been set up allowing users to calculate savings available by switching cards, which can be considerable if there is a large outstanding balance (see external links for some on-line services).

Because of intense competition in the credit card industry, credit providers often offer incentives such as frequent flier points, gift certificates, or cash back (typically up to 1 percent based on total purchases) to try to attract customers to their program.

Low interest credit cards or even 0% interest credit cards are available. The only downside to consumers is that the period of low interest credit cards is limited to a fixed term, usually between 6 and 12 months after which a higher rate is charged. However, services are available which alert credit card holders when their low interest period is due to expire. Most such services charge a monthly or annual fee.


Grace period
A credit card's grace period is the time the customer has to pay the balance, before interest is charged to the balance. Grace periods vary, but usually range from 10 to 55 days depending on the type of credit card and the issuing bank.


The merchant's side

Even some street market stands now take credit cards.For merchants, a credit card transaction is often more secure than other forms of payment, such as cheques, because the issuing bank commits to pay the merchant the moment the transaction is verified. The bank charges a commission (discount fee), to the merchant for this service and there may be a certain delay before the agreed payment is received by the merchant. In addition, a merchant may be penalized or have their ability to receive payment using that credit card restricted if there are too many cancellations or reversals of charges.

In some countries, like the Nordic countries, banks guarantee payment on stolen cards only if an ID card is checked. In these countries merchants therefore usually ask for ID.


Secured credit cards
A secured credit card is a type of credit card secured by a deposit account owned by the cardholder. Typically, the cardholder must deposit between 100% and 200% of the total amount of credit desired. Thus if the cardholder puts down $1000, he or she will be given credit in the range of $500–$1000. In some cases, credit card issuers will offer incentives even on their secured card portfolios. In these cases, the deposit required may be significantly less than the required credit limit, and can be as low as 10% of the desired credit limit. This deposit is held in a special savings account.

The cardholder of a secured credit card is still expected to make regular payments, as he or she would with a regular credit card, but should he or she default on a payment, the card issuer has the option of recovering the cost of the purchases paid to the merchants out of the deposit. The advantage of the secured card for an individual with negative or no credit history is that most companies report regularly to the major credit bureaus. This allows for rebuilding of positive credit history.

Although the deposit is in the hands of the credit card issuer as security in the event of default by the consumer, the deposit will not be credited simply for missing one or two payments. Usually the deposit is only used as an offset when the account is closed, either at the request of the customer or due to severe delinquency (150 to 180 days). This means that an account which is less than 150 days delinquent will continue to accrue interest and fees, and could result in a balance which is much higher than the actual credit limit on the card. In these cases the total debt may far exceed the original deposit and the cardholder not only forfeits their deposit but is left with an additional debt.

Most of these conditions are usually described in a cardholder agreement which the cardholder signs when their account is opened.

Secured credit cards are an option to allow a person with a poor credit history or no credit history to have a credit card which might not otherwise be available. They are often offered as a means of rebuilding one's credit. Secured credit cards are available with both Visa and MasterCard logos on them. Fees and service charges for secured credit cards often exceed those charged for ordinary non-secured credit cards, however, for people in certain situations, (for example, after charging off on other credit cards, or people with a long history of delinquency on various forms of debt), secured cards can often be less expensive in total cost than unsecured credit cards, even including the security deposit.


Features
As well as convenient, accessible credit, the cards offer consumers an easy way to track expenses, which is necessary for both monitoring personal expenditures and the tracking of work-related expenses for taxation and reimbursement purposes. Credit cards are accepted worldwide, and are available with a large variety of credit limits, repayment arrangement, and other perks (such as rewards schemes in which points earned by purchasing goods with the card can be redeemed for further goods and services or credit card cashback).

Some countries such as the United States, the United Kingdom and France limit the amount for which a consumer can be held liable due to fraudulent transactions as a result of a consumer's credit card being lost or stolen.


Security

A smart card, combining credit card and debit card properties. The 3 by 5 mm security chip embedded in the card is shown enlarged in the inset. The gold contact pads on the card enable electronic access to the chip.The low security of the credit card system presents countless opportunities for fraud. This opportunity has created a huge black market in stolen credit card numbers, which are generally used quickly before the cards are reported stolen.

The goal of the credit card companies, as they say, is not to eliminate fraud, but to "reduce it to manageable levels", such that the total cost of both fraud and fraud prevention is minimized[citation needed]. This implies that high-cost low-return fraud prevention measures will not be used if their cost exceeds the potential gains from fraud reduction.

Most Internet fraud is done through the use of stolen credit card information which is obtained in many ways, the simplest being copying information from retailers, either online or offline. There have been many cases of crackers obtaining huge quantities of credit card information from company databases. It is not unusual for employees of companies that deal with millions of customers to sell credit card information to criminals.

Despite efforts to improve security for remote purchases using credit cards, systems with security holes are usually the result of poor implementations of card acquisition by merchants. For example, a website that uses SSL to encrypt card numbers from a client may simply email the number from the webserver to someone who manually processes the card details at a card terminal. Naturally, anywhere card details become human-readable before being processed at the acquiring bank is a security risk. However, many banks offer systems such as ClearCommerce, where encrypted card details captured on a merchant's webserver can be sent directly to the payment processor.

Controlled Payment Numbers are another option for protecting one's credit card number: they are "alias" numbers linked to one's actual card number, generated as needed, valid for a relatively short time, with a very low limit, and typically only valid with a single merchant.

The Federal Bureau of Investigation is the agency responsible for prosecuting criminals who engage in credit card fraud in the United States, but they do not have the resources to pursue all criminals. In general, they only prosecute in cases exceeding US$5,000 in value. Three improvements to card security have been introduced to the more common credit card networks but none has proven to help reduce credit card fraud so far. First, the on-line verification system used by merchants is being enhanced to require a 4 digit Personal Identification Number (PIN) known only to the card holder. Second, the cards themselves are being replaced with similar-looking tamper-resistant smart cards which are intended to make forgery more difficult. The majority of smartcard (IC card) based credit cards comply with the EMV (Europay MasterCard Visa) standard. Third, an additional 3 or 4 digit code is now present on the back of most cards, for use in "card not present" transactions. See CVV2 for more information.

Profits and losses
In recent times, credit card portfolios have been very profitable for banks, largely due to the booming economy of the late nineties. However, in the case of credit cards, such high returns go hand in hand with risk, since the business is essentially one of making unsecured (uncollateralized) loans, and thus dependent on borrowers not to default in large numbers.

Costs
Credit card issuers (banks) have several types of costs:

Interest expenses
Banks generally borrow the money that they then lend to their customers. As they receive very low-interest loans from other firms, they may borrow as much as their customers require, while lending their capital to other borrowers at higher rates. If the card issuer charges 15% on money lent to users, and it costs 5% to borrow the money to lend, and the balance sits with the cardholder for a year, the issuer earns 10% on the loan. This 5% difference is the "interest expense" and the 10% is the "net interest margin".

Operating costs
This is the cost of running the credit card portfolio, including everything from paying the executives who run the company to printing the plastics to mailing the statements to running the computers that keep track of every cardholder's balance to taking the many phone calls which cardholders place to their issuer to tracking down fraud rings to protect the customers. Depending on the issuer, marketing programs are also a significant portion of expenses.

Charge offs
When a consumer becomes severely delinquent on a debt (often at the point of six months without payment), the creditor may declare the debt to be a charge-off. It will then be listed as such on the debtor's credit bureau reports (Equifax lists "R9" in the "Status" column.) It is one of the worst possible items to have on your file. The item will include relevant dates, and the amount of the bad debt.

A charge-off is considered to be "written off as uncollectable." A major reason for this involves taxes. Every year, corporations file a Profit And Loss Statement with the Internal Revenue Service. It is also made available to federal and state regulators, and to shareholders. All of the year's bad debts (individual charged-off accounts) are added together as an item in the "Loss" section of the P & L Statement, and are deducted from the corporation's tax return, much like other business expenses. To banks, bad debts and even fraud are simply part of the cost of doing business.

However, the debt is still legally valid, and the creditor can attempt to collect the full amount. This includes contacts from internal collections staff, or more likely, an outside collection agency. If the amount is large (generally over $1500 - $2000), there is the possibility of a lawsuit or arbitration.

In the US, as the charge off number climbs or becomes erratic, officials from the Federal Reserve take a close look at the finances of the bank and may impose various operating strictures on the bank, and in the most extreme cases, may close the bank entirely.


Rewards

Qantas Frequent Flyer co-branded credit cardsMany credit card customers receive rewards, such as frequent flier points, gift certificates, or cash back as an incentive to use the card. Rewards are generally tied to purchasing an item or service on the card, which may or may not include balance transfers, cash advances, or other special uses. Depending on the type of card, rewards will generally cost the issuer between 0.25% and 2.0% of the spend. However, most rewards points are accrued as a liability on a company's balance sheet and expensed at the time of reward redemption. As a result, some issuers discourage redemption by forcing the cardholder to call customer service for rewards. Others encourage redemption for lower cost merchandise; instead of an airline ticket, which is very expensive to an issuer, the cardholder may be encouraged to redeem for a gift certificate instead. With a fractured and competitive environment, rewards points cut dramatically into an issuer's bottom line, and rewards points and related incentives must be carefully managed to ensure a profitable portfolio.


Fraud
Where a card is stolen, or an unauthorized duplicate made, most card issuers will refund some or all of the charges that the customer has received for things they did not buy. These refunds will, in some cases, be at the expense of the merchant, especially in mail order cases where the merchant cannot claim sight of the card, but in other cases, these costs must be borne by the card issuer. In several countries, merchants will lose the money if no ID card was asked for, therefore merchants usually require ID card in these countries.

The cost of fraud is high; in the UK in 2004 it was over £500 million.[2] Credit card companies generally guarantee the merchant will be paid on legitimate transactions regardless of whether the consumer pays their credit card bill.


Revenues
Offsetting costs are the following revenues:


Interchange fees
Interchange fees are charged by the merchant's acquirer to a card-accepting merchant as component of the so-called merchant discount rate (also referred to as "merchant service fee"). The merchant pays a merchant discount fee that is typically 2 to 3 percent (this is negotiated, but will vary not only from merchant to merchant, but also from card to card, with business cards and rewards cards generally costing the merchants more to process), which is why some merchants prefer cash, debit cards, or even cheques. The majority of this fee, called the interchange fee, goes to the issuing bank, but parts of it go to the processing network, the card association (American Express, Visa, MasterCard, etc.), and the merchant's acquirer. With a corporate card, the interchange is also often shared by the company in whose name the card is issued as an incentive to use that issuer's card instead of someone else's.

The interchange fee that applies to a particular merchant is a function of many variables including the type of merchant, the merchant's average ticket dollar amount, whether the cards are physically present, if the card's magnetic stripe is read or if the transaction is hand-keyed, the specific type of card, when the transaction is settled, the authorized and settled transaction amounts, etc. For a typical credit card issuer, interchange fee revenues may represent about fifteen percent of total revenues, but this will vary greatly with the type of customers represented in their portfolio. Customers who carry high balances may generate low interchange revenue due to credit line limitations, while customers who use their cards for business and spend hundreds of thousands of dollars a year on their cards while paying off balances every month will have very healthy interchange revenues.

Contract terms
Credit card issuers reserve the right to change the terms of the contract at any time, even for customers who maintain a perfect payment record.

Industry's jargon for customer categories
Customers who do not pay in full the amount owed on their monthly statement (the "balance") by the due date (that is, at the end of the "grace period") and are not in a promotional period owe interest ("finance charges") are known in the industry as "revolvers". Those who pay in full (pay the entire balance) are known in the industry as "transactors", "convenience users" or "deadbeats". Those that shift usage of their credit cards or transfer balances frequently are known in the industry as "rate surfers" or "gamers".

Interest on outstanding balances
Interest charges vary widely from card issuer to card issuer. Often, there are "teaser" rates in effect for initial periods of time (as low as zero percent for, say, six months), whereas regular rates can be as high as 40 percent. In the U.S. there's no federal limit on the interest or late fees credit card issuers can charge; the interest rates are set by the states, with some states like South Dakota having no ceiling on interest rates and fees, inviting some banks to establish their credit card operations there. Other states like Delaware have very weak usury laws. See Usury laws.

Fees charged to customers
The major fees are for:

Late payments 
Charges that result in exceeding the credit limit on the card (whether done deliberately or by mistake) 
Returned check fees or payment processing fees (eg phone payment fee) 
Cash advances and convenience checks (often 3% of the amount) 
Transactions in a foreign currency (as much as 3% of the amount). A few financial institutions do not charge a fee for this. 
Membership fees (annual or monthly), sometimes a percentage of the credit limit. 

Neutral consumer resources

Canada
The Government of Canada maintains a database of the fees, features, interest rates and reward programs of nearly 200 credit cards available in Canada. This database is updated on a quarterly basis with information supplied by the credit card issuing companies. Information in the database is published every quarter on the website of the Financial Consumer Agency of Canada (FCAC).

Information in the database is published in two formats. It is available in PDF comparison tables that break down the information according to type of credit card, allowing the reader to compare the features of, for example, all the student credit cards in the database.

The database also feeds into an interactive tool on the FCAC website. The interactive tool uses several interview-type questions to build a profile of the user's credit card usage habits and needs, eliminating unsuitable choices based on the profile, so that the user is presented with a small number of credit cards and the ability to carry out detailed comparisons of features, reward programs, interest rates, etc.

History
The credit card was the successor of a variety of merchant credit schemes. It was first used in the 1920s, in the United States, specifically to sell fuel to a growing number of automobile owners. In 1938 several companies started to accept each other's cards.

The concept of using a card for purchases was invented in 1887 by Edward Bellamy and described in his utopian novel Looking Backward. Bellamy uses the explicit term "Credit Card" eleven times in his novel (Chapters 9, 10, 11, 13, 25 and 26) and 3 times (Chapters 4, 8 and 19) in its sequel, Equality.

The concept of paying merchants using a card was invented in 1950 by Ralph Schneider and Frank X. McNamara in order to consolidate multiple cards. The Diners Club, which was created partially through a merger with Dine and Sign, produced the first "general purpose" charge card, which is similar but required the entire bill to be paid with each statement; it was followed shortly thereafter by American Express and Carte Blanche. Western Union had begun issuing charge cards to its frequent customers in 1914.

Bank of America created the BankAmericard in 1958, a product which eventually evolved into the Visa system ("Chargex" also became Visa). MasterCard came to being in 1966 when a group of credit-issuing banks established MasterCharge. The fractured nature of the US banking system meant that credit cards became an effective way for those who were travelling around the country to, in effect, move their credit to places where they could not directly use their banking facilities. In 1966 Barclaycard in the UK launched the first credit card outside of the US.

There are now countless variations on the basic concept of revolving credit for individuals (as issued by banks and honored by a network of financial institutions), including organization-branded credit cards, corporate-user credit cards, store cards and so on.

In contrast, although having reached very high adoption levels in the US, Canada and the UK, it is important to note that many cultures were much more cash-oriented in the latter half of the twentieth century (Germany, France, Switzerland, among many others). In these places, the take-up of credit cards was initially much slower. It took until the 1990s to reach anything like the percentage market-penetration levels achieved in the US, Canada or UK. In many countries acceptance still remains poor as the use of a credit card system depends on the banking system being perceived as reliable.

In contrast, because of the legislative framework surrounding banking system overdrafts, some countries, France in particular, were much faster to develop and adopt chip-based credit cards which are now seen as major anti-fraud credit devices.

The design of the Credit Card itself has become a major selling point in recent years. The value of the card to the Issuer being related to the Customer's usage of the card. This has led to the rise of Co-Brand and Affinity cards - where the card design is related to the Affinity (a University, for example) leading to higher card usage. In most cases a percentage of the value of the card is returned to the Affinity group.

The ultimate extension of this is the personalised card, first used by Bank of Hawaii in 1969, but now delivered online by software firms such as Serverside to banks including ANZ, KBC, Abbey, Fortis and ING.

Controversy
As mentioned, the merchant pays a negotiated fee -- typically 1-3% for larger merchants and 3-6% for smaller merchants -- to process credit payments. Merchants who accept credit card payments typically sign a "merchant agreement," promising that they won't offer different prices for card and non-card transactions. In some countries the fee may be significantly more. If customers were responsible for this fee, it would often discourage credit card usage. Some critics have observed that this results in what is effectively a hidden tax on all transactions conducted by merchants who accept credit cards since they must build the cost of transaction fees into their overall business expense. The end result is that other customers are essentially subsidizing credit card holder purchases. The cost of the convenience enjoyed by card holders and the profits taken from transaction fees by the card industry (which has come to rely increasingly on this revenue stream over the years) is partially offloaded onto the backs of the cash customer. Critics go on to say that further compounding the issue is the fact that the customers most likely to pay in cash are the least able to afford the additional expense (card holders are more likely to be affluent, non-card holders less so).

A counterargument is that there are also costs to the merchant in other forms of payment. For cash payments these include frequent trips to the bank or use of an armored delivery service, theft, and employee error, such that cash is actually not cheaper for the merchant than credit cards. Some businesses may offer a discount for cash-paying customers.

Some companies offer incentives or bonus coupons for using cash, such as Canadian Tire Money. Australia is currently acting to reduce this by allowing merchants to apply surcharges for credit card users. In the United Kingdom, merchants won the right through The Credit Cards (Price Discrimination) Order 1990 to charge customers different prices according to the payment method, but few merchants do so (the most notable exceptions being budget airlines and travel agents). The United Kingdom is the world's most credit-card-intensive country, with 67 million credit cards for a population of 59 million people.[3]

There also exists an economic argument that credit card use increases the "velocity" of money in an economy. The result, according to the quantity theory of money, is an effective increase in the money supply, as more money is flowing through the economy at a given time. Although there is many a sad story of credit card abuse, the trend is increasing use, with some predicting a cashless society in the not so distant future.

There is some controversy about credit card usage in recent years. Credit card debt has soared, particularly among young people. Since the late 1990s, lawmakers, consumer advocacy groups, college officials and other higher education affiliates have become increasingly concerned about the rising use of credit cards among college students. The major credit card companies have been accused of targeting a younger audience, in particular college students, many of whom are already in debt with college tuition fees and college loans and who typically are less experienced at managing their own finances. A recent study by United College Marketing Services has shown that student credit lines have increased to over $6,000. Credit card usage has tripled since 2001 amongst teenagers as well. Since eighteen year-olds in many countries and most U.S. states are eligible for a card without parental consent or employment, the likelihood of increased balances, unwise use of credit and damaged credit scores increases.

According to Larry Chiang of United College Marketing Services, an example of a credit card class action was where issuers were "rolling back" posting times to extract more late fees. The due dates were "rolled back" from 1pm to 10am because mail was delivered in the afternoon so due dates were actually rolled back to charge more late fees. The following banks are listed (with the amounts penalized) in this one particular class action.

Providian: US$405 million 
Bank One: US$40 million 
Chase: US$22.2 million 
Citibank: US$15.5 million 
Another controversial area is the universal default feature of many North American credit card contracts. When a cardholder is late paying a particular credit card issuer, that card's interest rate can be raised, often considerably. Given this circumstance with one credit card, universal default allows other card issuers to raise the cardholder's interest rates on other accounts, even if those other accounts are not in default.

In the United States, some have called for Congress to enact additional regulations on the industry; to expand the disclosure box clearly disclosing rate hikes, use plain language, incorporate balance payoff disclosures, and also to outlaw universal default. Opponents - usually of a conservative or libertarian orientation - of such regulation argue that customers must become more proactive and self-responsible in evaluating and neogotiating terms with credit offerers. The nation's influential top three bank card issuers, who are among the top fifty corporate contributors to political compaigns, successfully opposed it.

Minimum payments
In the UK, there has recently been increasing concern about the minimum payments required on outstanding credit card balances. Until the mid-1990s the required minimum monthly payment was generally 5% of the outstanding balance, but competition in the last 15 years to attract customers has led to this figure being eroded on the premise that the minimum monthly payment to service a debt will be lower. Typically, credit card companies now only require a monthly minimum payment of between 2% and 3% of the outstanding balance, or a fixed cash fee, whichever is the greater. For example, on a debt of £1,000, the card holder can expect to pay back only £20 - £30 per month.

Unfortunately, some people are not aware of how long it can take to repay a debt when only paying the minimum each month. An example of this: by paying 2.5% of the debt each month, while accruing interest at 14% (in line with modern credit card interest rates), it can take over 14 years to pay back an original debt of £1,000.

It has recently been suggested that credit card companies include a warning on their statements discouraging customers from paying only the minimum, however few companies have so far acted upon this. Companies which do include a warning tend not to inform customers how long full repayment will take, i.e. they discourage users from making just minimum payments but do not explain why. Less financially savvy customers may ignore these empty warnings as a result.

Starting in 2006, most US credit card companies regulated by the Office of the Comptroller of the Currency have been required to increase customers' minimum payments to cover at least the interest and late fees from the prior statement plus 1% of the outstanding balance. The reason is to avoid a negative amortization situation which may result when the previous 3% minimum was enforced.

Trailing interest
Trailing interest, sometimes called final or residual interest, is a method of calculation whereby interest is charged right up until the day of a full payment. Cardholders of banks that use this method receive a bill with the balance owing and interest accrued and pay it off in full. On the next statement they are billed a "final" amount of interest even if no purchases or cash advances have been debited since. The reason for this is that interest continues to accrue from the time of the close of the previous statement until the day the payment for that statement is actually received.

In comparison to the normal method of interest calculation, this method is judged by many to be a hidden and thus unfair cost. Uninformed cardholders often inquire as to what amount they need to pay by their due date in order to have paid off their credit card in full and to stop interest from accumulating. They then proceed to pay off this amount under the belief that they are finished paying interest charges, only to find trailing interest on their next statement which was posted to their account on the day of the statement billing (so even if they check their balance a day before that next billing date, it would still show a zero balance).

Credit card numbering
Main article: Credit card number
The numbers found on credit cards have a certain amount of internal structure, and share a common numbering scheme.

The card number's prefix, called the Bank Identification Number, is the sequence of digits at the beginning of the number that determine the bank to which a credit card number belongs. This is the first six digits for Mastercard and Visa cards. The next nine digits are the individual account number, and the final digit is a validity check code.

In addition to the main credit card number, credit cards also carry issue and expiration dates (given to the nearest month), as well as extra codes such as issue numbers and security codes. Not all credit cards have the same sets of extra codes nor do they use the same number of digits.


Credit cards in ATMs
Many credit cards can also be used in an ATM to withdraw money against the credit limit extended to the card but many card issuers charge interest on cash advances before they do so on purchases. The interest on cash advances is commonly charged from the date the withdrawal is made, rather than the monthly billing date. Many card issuers levy a commission for cash withdrawals, even if the ATM belongs to the same bank as the card issuer. Merchants do not offer cashback on credit card transactions because they would pay a percentage commission of the additional cash amount to their bank or merchant services provider, thereby making it uneconomical.


Many credit card companies will also, when applying payments to a card, do so at the end of a billing cycle, and apply those payments to everything before cash advances. For this reason, many consumers have large cash balances, which have no grace period and incur interest at a rate that is (usually) higher than the purchase rate, and will carry those balance for years, even if they pay off their statement balance each month. 

What Credit Card
credit-card-guideto.com Your free independent guide to what credit card.
Web definitions for Credit card 

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