0% Balance Transfer Credit Cards Explained (UK 2026)

A 0 balance transfer credit card lets you move debt from one or more existing credit cards onto a new card that charges no interest for a set promotional period. Used well, it can turn an expensive, slow-shrinking balance into a debt you actually clear, because for those months every pound you pay reduces what you owe instead of disappearing into interest. This guide explains how a balance transfer works, how to do one step by step, what it costs, and the traps that catch people out, without naming specific products or quoting deals that will be out of date by next month.

What is a balance transfer?

A balance transfer is simply moving the amount you owe on one credit card across to another. The new lender pays off your old card balance, and you then owe that same amount to the new lender instead. Nothing about the size of your debt changes at the moment of transfer; what changes is the interest rate you pay on it going forward.

The reason people do this is the 0% balance transfer offer. To win new customers, card providers advertise an introductory period, often counted in months, during which they charge 0% interest on the balance you bring over. Outside that promotional window a credit card typically charges somewhere around 20% to 30% APR, so moving a balance to 0% can save a serious amount of money while you pay it down.

According to MoneyHelper, the government-backed money guidance service, a balance transfer card can be a sensible way to take control of existing debt, but only if you have a realistic plan to clear it before the 0% rate ends.

How does a balance transfer work?

If you are wondering how does a balance transfer work in practice, it comes down to three moving parts: the promotional rate, the length of the offer, and the fee.

• The 0% promotional period. This is the number of months the new card charges no interest on the transferred balance. It is fixed and it counts down from the day your account opens, not from the day the transfer completes, so the clock may already be ticking before the money moves.
• The balance transfer fee. Most 0% deals charge a one-off balance transfer fee, usually a percentage of the amount you move (commonly somewhere in the region of 2% to 4%, though this varies). The fee is added to your balance when the transfer goes through. A longer 0% period often comes with a higher fee, so the right card depends on how long you genuinely need.
• The revert rate. When the 0% period ends, any balance left over starts accruing interest at the card's standard APR. That rate is typically high, which is exactly the interest you were trying to escape, so the goal is to owe as little as possible by then.

One crucial point: a balance transfer card is for moving existing debt, not for new spending. Purchases you make on the card are usually not covered by the 0% balance transfer rate and may be charged interest from day one. Keep the card for the transferred balance only.

How to do a balance transfer, step by step

1. Add up what you owe and the rate you pay. List each card balance and its APR. This tells you how much you need to transfer and how much interest you are currently paying.
2. Work out how long you need to clear it. Divide your total debt by what you can realistically afford each month. If you can pay £200 a month against £3,000, you need roughly 15 months at 0%, so look for an offer comfortably longer than that.
3. Compare offers on the right factors. Look at the length of the 0% period, the transfer fee percentage, and the credit limit you are likely to get. A useful comparison is the total cost: the fee you pay versus the interest you save. Many comparison sites also offer an eligibility checker that shows your chances of approval using a soft search that does not affect your credit file.
4. Apply for the new card. You can usually request the transfer during the application or shortly after. You will need the account details of the card or cards you are paying off.
5. Complete the transfer promptly. Most providers ask you to make transfers within a set window (often the first 60 to 90 days) to qualify for the headline rate. Do it early so you lose as little of the 0% period as possible.
6. Keep paying both cards until the transfer settles. A transfer can take several working days. Until your old statement shows the balance cleared, keep making at least the minimum payment on the old card to avoid a late mark.
7. Set up a fixed monthly payment. Do not just pay the minimum. Set a standing order or direct debit for an amount that clears the balance before the 0% ends, and never miss it.

Worked example: how much interest can you save?

Imagine you owe £4,000 on a credit card charging 24.9% APR, and you can afford to pay £175 a month. Compare leaving it where it is against transferring to a 0% card with a 3% transfer fee.

In this example the transfer fee costs £120, but it saves you roughly £1,000 in interest and clears the debt months sooner, because every payment attacks the balance instead of being eaten by interest. The exact figures depend on the rates and offer length available to you, which is why it helps to model your own numbers with the Credit Card Repayment Calculator before you apply.

What happens when the 0% period ends?

This is where balance transfers go wrong for unprepared borrowers. The day after the promotional period finishes, any remaining balance starts being charged at the card's standard purchase or transfer APR, which is usually high. There is no grace period and no automatic extension.

You have a few options as the deadline approaches:

• Best case: you have cleared it. If your fixed monthly payments have done their job, the balance is gone and you simply keep the card open (or close it) with nothing owing.
• Transfer again. If a balance remains, you may be able to move it to another 0% card. This is sometimes called card tarting. It can work, but each new card means another transfer fee and another credit application, and there is no guarantee you will be accepted next time.
• Pay the standard rate. If you cannot transfer, the remaining balance reverts to full interest. The longer it lingers, the more it costs, so prioritise clearing it.

How a balance transfer affects your credit score

People often worry about the link between a balance transfer credit score hit and applying for a new card. The honest answer is that the effect is usually small and short-lived, and can even be positive over time.

• The application. Applying for any credit card triggers a hard search on your credit file, which can dip your score slightly for a few months. Use eligibility checkers (soft searches) first so you only formally apply where you are likely to be accepted.
• Your credit utilisation. A big new credit limit can lower the percentage of your available credit you are using, which lenders view positively. But opening a card and immediately filling most of its limit with a transfer can look like high utilisation at first.
• Your payment history. This is the big one. Paying on time, every time, builds your record; a single missed payment can damage it and, as below, can void your 0% deal.

As Citizens Advice notes, managing a credit card responsibly, meaning staying within your limit and paying on time, is one of the steadier ways to build a healthy credit history. If building credit is your main goal, see our guide to credit cards for building credit in the UK.

Are you eligible?

The longest 0% offers and the lowest fees generally go to people with a strong credit history. Providers look at your credit file, income, existing debts and whether you have managed credit well before. A couple of points worth knowing:

• You usually cannot transfer a balance between two cards from the same bank or banking group. The transfer has to be to a different provider.
• The credit limit you are offered may be lower than the balance you want to move, so you might only be able to transfer part of your debt.
• If your debts are spread across several cards and feel unmanageable, a balance transfer may not be the whole answer. It is worth comparing it with consolidating into a single loan using the Debt Consolidation Calculator, and reading more in our credit cards guides.

Pros and cons

Pros

• No interest for the promotional period, so payments clear the actual debt.
• Can save hundreds or thousands of pounds compared with a high-APR card.
• Simplifies several balances into one monthly payment.
• Clears debt faster, with a clear deadline to aim for.

Cons

• A transfer fee usually applies, adding to your balance.
• The high revert rate is punishing if you do not clear the balance in time.
• Missing a payment can cancel the 0% deal entirely.
• It treats the symptom, not the cause, if overspending is the underlying problem.

Common mistakes

• Missing a payment. This is the most expensive slip. Miss a minimum payment and most providers can withdraw the 0% rate, snapping your balance straight onto the standard APR. Set up a direct debit for at least the minimum so it can never happen by accident.
• Spending on the card. New purchases are usually not covered by the 0% transfer rate and start charging interest immediately. Worse, your payments may be applied to the cheapest debt first, leaving the expensive purchase balance growing. Keep this card strictly for the transferred balance.
• Not clearing the balance before the deal ends. If you only ever pay the minimum, you will still owe a large chunk when the 0% expires and the high interest kicks in. Divide your balance by the number of 0% months and pay at least that each month.
• Forgetting the transfer deadline. Many cards only give the 0% rate on transfers made in the first 60 to 90 days. Leave it too late and you lose the offer on that balance.
• Chasing the longest 0% period regardless of fee. A longer offer with a 4% fee can cost more than a shorter one with a 1% fee if you only need 12 months. Match the deal to how long you actually need.
• Closing the old card too soon. Keeping a paid-off card open can help your credit utilisation, though you should weigh that against the temptation to spend on it again.

FAQs

What is a balance transfer fee?

It is a one-off charge for moving your debt to the new card, usually a percentage of the amount transferred (often around 2% to 4%). It is added to your balance at the time of transfer. Always weigh the fee against the interest you will save; for most high-APR debts the saving far outweighs the fee.

Does a balance transfer hurt my credit score?

Applying involves a hard credit search that can dip your score slightly for a few months. Beyond that, the effect depends on how you manage the card. Paying on time and reducing your overall debt tends to help your score over the medium term.

Can I transfer a balance between cards from the same bank?

Usually not. Most providers will not let you transfer a balance to another card from the same bank or banking group, so the new 0% card needs to be with a different lender.

Can I spend on a 0% balance transfer card?

You can, but you generally should not. Purchases are typically not covered by the 0% transfer rate and may attract interest straight away. Use the card only for the balance you transferred, and keep everyday spending on a different card you clear in full each month.

What happens if I do not clear the balance in time?

Any remaining balance starts being charged at the card's standard APR, which is usually high. You may be able to move it to another 0% card, but that means a fresh application and another fee, and approval is not guaranteed, so aim to clear it within the offer period.

Sources

• MoneyHelper - Balance transfer credit cards
• Citizens Advice - Credit cards
• gov.uk - Options for paying off your debts

This guide is general information, not personal financial advice. For your own circumstances, speak to a qualified adviser.