A credit card lets you buy things from a pot of money you borrow from a bank, building society or other lender. The lender will then send you a bill - or statement - every month and you’ll need to pay back the money you’ve spent.

How does a credit card work?

When you use a credit card, you’re borrowing money. Every month, you’ll be sent a statement from your lender - it’ll show you the total amount of money you need to pay back (the closing balance) and the due date.

They’ll also tell you what the minimum payment is.

It’s a good idea to pay back the full amount so you don’t have to pay interest; if you can’t, you could make the minimum payment, but this costs more in interest and takes far longer to clear the balance.

What’s credit card interest?

All credit cards come with interest rates - what lenders charge for borrowing. It usually applies if you don’t pay in full and on time, and from day one on cash withdrawals. You’ll know what it is during the application process and usually see it as an APR (annual percentage rate).

That’s why it’s important to budget and pay off your monthly credit card statements in full and on time. Otherwise, interest rates can be applied, and you’ll end up paying back more than what you used.

Sometimes, a credit card comes with a promotional offer - like 0% interest for a few months. It would usually be on an introductory offer for new users and can be a safety blanket while you get used to credit cards. But, if you choose a credit card with an offer, make sure you understand what rates will be applied when that promotional period is over.

What’s a credit card limit?

Your credit card will come with a limit - it’s the maximum amount of money you can use at any one time. Generally, try to keep credit utilisation below 30% of your limit.

Remember: you have to pay back whatever money you use.

How much you use is called ‘credit utilisation’. Using less than your total credit limit, and paying it back on time and in full, can help you in the future. That’s because you’ll have a track record of paying back money responsibly. So, if you want another credit card, loan or car finance, for example, you could see better offers.

Learn more: What is a credit limit and how does it affect your credit score and report?

What’s the application process like?

To apply for a credit card, you need to be a UK resident and at least 18 years old. You usually need to share additional information like your income, address and proof of ID.

If you apply for a credit card online, you could find out if you’ve been approved within a few minutes. Applying at a branch might take longer.

Once you’ve been approved, you’ll get your credit card in the post - it can take about two weeks, and you can use the card as soon as you activate it.

What’s a credit check?

When you apply for a credit card, lenders perform a credit check, also known as a hard search. Lenders want to be sure that the person they lend money to can afford any repayments. So, they search your credit report to see how well you manage money and if there are any negative marks, like debt, on there.

A hard search can have a negative effect on your credit score. It can stay visible on your credit report for one to two years, depending on the agency, but if you make your repayments on time and in full, the effect on your score usually fades within the first few months.

How do credit cards affect your credit score and report?

Your credit score is a number that - combined with your credit report - helps lenders understand how you manage money. The scale depends on which credit reference agency it comes from: ClearScore isn’t a credit reference agency, but shows your score for free using Equifax data, out of 1,000, while Experian scores are out of 1,250 and TransUnion scores are out of 999.

It’s made up of things in your credit report, like the number and type of accounts you have, how much of your available credit you’ve used, your payment history and the length of your credit history.

The way you use your credit card (how much of your limit you use, how you pay it back, how often you apply for a credit card) has an impact on your score. There are several ways a credit card can affect your credit score and report.

Credit card habits that damage your credit score (and what to do instead)

The biggest killer of credit scores is missed and late payments - nothing else on your credit report does as much damage, as quickly, or lingers as long. Most of the other habits below are fixable in a month or two. Here's what to watch for, and what to do instead.

• Missing or paying late. A payment more than 30 days overdue can be recorded as a missed payment and stays on your credit report for six years. Even one can knock a good score down noticeably. Instead: set up a Direct Debit for at least the minimum payment, so a busy month never becomes a black mark.

• Running your utilisation high. Using most or all of your limit signals to lenders that you're stretched, even if you pay it all back. Instead: try to keep credit utilisation below 30% of your limit where you can, and pay down before your statement date so a lower balance is what gets reported.

• Paying only the minimum, month after month. Minimum payments keep the account in good standing, but they're designed to clear the debt very slowly and cost a lot in interest. A persistently high balance also holds your utilisation up. Instead: pay whatever you can above the minimum, and treat the minimum as a floor, not a target.

• Applying for several cards in a short space of time. Each application leaves a hard search, and a cluster of them looks like you're struggling for credit. Instead: space applications out - a few months apart is sensible - and use an eligibility check first to see which cards you're a stronger match for, remembering that approval always rests on the lender's own checks.

• Closing an old or unused card. This is where people often get it wrong. Closing a card removes its limit from your total available credit, which pushes your credit utilisation up overnight, and if it's your oldest account you also shorten your average credit history. So is it better to cancel unused credit cards or keep them? In most cases, keeping an old card open - and using it for a small purchase now and then so it doesn't go dormant - helps your score more than closing it. Closing still makes sense if the card charges an annual fee you're not getting value from, if you can't trust yourself not to spend on it, or if you're worried about fraud on a card you never check.

• Withdrawing cash on a credit card. Cash withdrawals usually attract a fee and start charging interest immediately, with no interest-free period. Some lenders also view frequent cash advances as a sign of financial pressure. Instead: use a debit card for cash, and keep the credit card for purchases.

• Not being on the electoral roll - or having no history at all. Lenders use the electoral roll to confirm you are who you say you are and that you live where you say you live. Not being registered can slow down or scupper an application. And a completely empty credit report gives lenders nothing to judge you on, which isn't the same as a clean slate. Instead: register to vote at your current address, and build a modest track record with a low-limit card used lightly and repaid in full.

The habits that actually build a score

There's no way to add hundreds of points overnight, but the following, done consistently, moves things in the right direction:

• Pay on time, every time - set a Direct Debit so it happens automatically.

• Keep your balance well below your limit.

• Clear the full balance where you can, so you pay no interest.

• Keep older accounts open and lightly used.

• Apply for new credit sparingly, and only after an eligibility check.

• Register on the electoral roll and keep your address details up to date.

• Check your credit report regularly and challenge anything that looks wrong.

What happens if your credit card application is declined?

You need to meet certain requirements to get a credit card, so understanding how different factors affect your chances is key. If you can’t get a credit card, have a look at the possible reasons why.

FAQs

Keep reading for some of the most common credit card questions.

How much can you borrow?

Your credit limit reflects your score, your income, existing borrowing and whether repayments look affordable. A good score could mean better offers - that’s because a good score suggests you have a history of paying back money responsibly. And lenders are more likely to trust you with a higher credit limit.

Remember: always make sure you can afford repayments.

What happens if you miss a payment?

If you miss a credit card payment, there are things you can do to get yourself back on track.

How will you be charged when you use a credit card?

Your lender will send you a credit card statement (bill) every month. You’ll need to pay back what you owe - or the minimum payment - by the due date shown in the statement. You can do this by transferring money from another account or by setting up a Direct Debit.

The payment due date is the same every month (depending on bank holidays and leap years), and sometimes it doesn’t work for your budget. You’re likely to want to have a payment due date after your payday - you can speak to your lender and ask if they can change the date.

Can you use your credit card abroad?

Most credit cards can be used abroad, and they can be a great alternative to carrying cash. Check with your lender if there are fees you should be aware of (like non-sterling transaction fees, cash withdrawal fees, interest rates or exchange rate fees).

What’s the difference between a credit card and a debit card?

Debit cards let you take out money directly from your bank account, whereas credit cards let you borrow money. Some debit cards do come with an overdraft but that tends to be less than a credit card limit and the interest rate could be higher.

Next step: Start comparing credit cards with ClearScore, today.

Types of credit card compared

Not all credit cards do the same job. Some are built for spreading the cost of a big purchase, some for shifting existing debt, some for earning rewards, and some for building a credit history from scratch. Picking the type that matches what you actually need it for matters more than chasing the lowest headline rate.

You can hold more than one type at once - for example, a credit-builder card for regular small spending and a 0% purchase card for a one-off cost. Just remember that every card you hold adds to the total credit available to you, and every application leaves a record on your credit report.

How to choose the right credit card for you

To narrow down which credit card might suit your needs, start with the job you want the card to do rather than the rate on the advert. A card that's excellent for shifting existing debt can be a poor choice for everyday spending, and a rewards card is only worth having if you clear the balance every month. Be specific about the purpose: everyday shopping, a big one-off purchase, moving a balance you already owe, building a credit history, or spending abroad.

Match the card type to the purpose

Once you know the job, the shortlist narrows quickly. Spreading the cost of a large purchase points to a 0% purchase card. Existing debt on another card points to a balance transfer deal. Little or no credit history points to a credit-builder card with a low limit. Regular travel or online orders in another currency points to a card with no non-sterling transaction fee. Rewards and cashback only make sense if you're confident you'll pay in full - otherwise the interest will cost you more than the perks are worth.

Compare more than the headline APR

The APR tells you the cost of borrowing over a year, but it isn't the whole picture. Check the length of any promotional period and what the rate reverts to afterwards, whether there's a balance transfer or money transfer fee, whether there's an annual or monthly card fee, the minimum payment terms, and the fees for cash withdrawals and overseas spending. A slightly higher rate with no transfer fee can work out cheaper than a longer 0% deal with a chunky fee attached - do the sums against the balance you actually plan to move.

Why 'representative APR' isn't always the rate you'll get

Lenders only have to offer the advertised representative APR to 51% of the people they accept. The other 49% may be offered a higher rate, a lower limit, or different terms, based on what the lender sees in your credit report. That's why two people can apply for exactly the same card and end up with very different deals. Treat the representative APR as a guide to where a card sits in the market, not as a promise about your own rate.

Use an eligibility check before you apply

Rather than comparing cards on advertised rates alone, the most useful comparison shows you how likely you are to be accepted. An eligibility check uses a soft search, which only you can see on your credit report and doesn't affect your credit score and report, so you can see your chances across several cards before committing to a single application. That matters because a full application leaves a hard search, and several hard searches in a short window can make lenders wary. ClearScore shows you cards matched to your credit report for free, so you can narrow the field before anyone runs a hard search. ClearScore is a credit broker, not a lender.

Red flags to avoid

The most common mistake is applying for a premium rewards or long 0% card when your score sits in the ‘Let’s start climbing’ (0-409) or ‘Moving on up’ (410-519) bands. These cards are aimed at people in the higher score bands, and lenders also weigh up your income, existing borrowing and whether repayments are affordable, so an application may well be declined - and the rejection plus the hard search can make the next application harder still. Other warning signs: choosing a card purely for a sign-up bonus you'd have to spend heavily to unlock, taking a long balance transfer deal you don't intend to clear before it ends, and applying for a card with a limit you know you'd struggle to repay. Before applying, consider whether the card's costs, features and repayment terms fit your needs and budget. Eligibility and the terms offered are decided by the lender.

Credit card 'rules' you'll see online - and whether they apply in the UK

A lot of the credit card advice that turns up in search results was written for an American audience, with American lenders and American scoring in mind. Some of it translates. Plenty of it doesn't. Here's what to make of the rules you'll see repeated most often.

What is the 2/3/4 rule for credit cards - and does it apply in the UK?

The 2/3/4 rule is an unofficial guideline about how many cards certain US issuers will approve: roughly two new cards in 30 days, three in 12 months, and four in 24 months. It describes the internal application rules of a small number of American banks. It is not a law, it is not a scoring rule, and it does not apply to UK lenders. No UK bank or building society operates a published 2/3/4 policy, so don't use it as a checklist for what you can get away with here.

Are there similar application limits with UK lenders?

Not as a stated rule, but the underlying caution is sound. UK lenders can see the hard searches on your credit report, and several applications close together suggest you're either being turned down repeatedly or taking on a lot of credit at once. Both make lenders more cautious. Spacing applications a few months apart, and running an eligibility check before you apply, achieves the same protection the 2/3/4 rule is reaching for - without pretending a foreign bank's policy governs your credit report.

Can you really get a 700 credit score in 30 days?

Realistically, no. Credit scores are built on patterns of behaviour over time, and lenders typically report to credit reference agencies once a month, so even a genuine improvement takes at least one reporting cycle to show up. What you can do in 30 days is remove the obvious drags: register on the electoral roll, set up a Direct Debit so no payment is missed, pay down a high balance before your statement date, and dispute any errors on your report. Those changes can nudge a score up quickly. Jumping to a specific number in a month is a promise no one can honestly make.

What does 700 mean on ClearScore's score range?

This is where the US advice really comes unstuck. "700" is treated as a milestone because the common US scales run from 300 to 850. ClearScore shows your Equifax score on a scale of 0 to 1000, so 700 sits in a completely different place on our range than it would on an American one. Rather than aiming at a number you've read somewhere else, look at the band your score falls into on the scale you're actually being measured on, and what lenders in that band tend to be offered.

How quickly can your credit score realistically change?

Expect movement month by month rather than day by day. Small wins - lower utilisation, electoral roll registration, a corrected error - can show within one or two reporting cycles. Rebuilding after missed payments, defaults or a county court judgment takes far longer, because those markers stay on your credit report for six years. The good news is that their impact fades as they age, particularly if newer accounts are being managed well.

Does checking your own credit score lower it?

No. Checking your own score is a soft search, which only you can see and which has no effect on your score at all. You can check as often as you like. It's only hard searches, left when you formally apply for credit, that lenders can see and that can affect your score.

How many credit cards is too many?

There's no magic number. What matters is whether you can comfortably repay what you owe, whether you're keeping your overall utilisation low across all your cards, and whether the applications were spread out rather than bunched together. Two cards used carelessly will hurt you more than four used well. If you're losing track of due dates or leaning on one card to pay another, that's the real signal you've got too many.