UK Cashback Credit Cards — How the Rewards Really Work

A cashback credit card returns part of eligible spending, subject to its terms. Compare the reward after fees, caps and interest rather than the headline percentage. If a card encourages extra purchases or you cannot reliably repay the statement, rewards can be outweighed by costs.

How do I calculate net cashback?

For a simple flat-rate card:

Net annual cashback = eligible annual spending × cashback rate − annual fee − other costs.

Caps, introductory offers, excluded transactions and tiers need separate treatment. The examples below are illustrations, not named products or current offers.

Example on £12,000 annual eligible spending	Gross reward	Annual fee	Net reward before other costs
Card A: 0.5%, no cap	£60	£0	£60
Card B: 1%, no cap	£120	£30	£90

Card B is £30 ahead in this example. Its extra 0.5 percentage points cover the £30 fee only after £6,000 eligible spending: £30 ÷ 0.005. Below that level, Card A gives the higher net reward, assuming identical other terms. A spending target is not a reason to buy things you do not need.

How do monthly caps change the result?

Suppose a hypothetical offer pays 1% but caps cashback at £10 each month. On £1,500 of eligible spending you receive £10, not £15. The effective reward is £10 ÷ £1,500, about 0.67%. Spending £18,000 evenly across the year gives £120, not £180.

A monthly cap also means you cannot necessarily average an expensive month across quieter months. Calculate each period separately and check whether refunds reduce previously earned cashback.

What about tiered or promotional rates?

Split spending into the bands to which each rate applies. If the first £5,000 earns 0.5% and the next £7,000 earns 1%, the result is £25 + £70 = £95, not 1% of the whole £12,000. Check whether the provider resets the tier each calendar year, membership year or month.

Do not annualise a short introductory rate as if it lasts forever. Include any maximum promotional reward and the standard rate that follows.

Which payments count?

Read the issuer's definition of eligible purchases. Cash withdrawals, transfers, fees and other cash-like payments can have different treatment from shopping. A bill qualifies only if the merchant accepts the card and the issuer's conditions include the transaction; a direct debit is not a credit-card purchase.

Keep cashback rewards separate from withdrawing cash on a credit card. A cash advance can involve fees and interest without earning rewards. See MoneyHelper's credit-card guidance.

Can interest wipe out the reward?

Yes. A £10 reward does not offset £25 of interest and fees: the net cost is £15. Check the payment due date, minimum payment, statement balance and the conditions for any interest-free purchase period. A full-balance direct debit can help with administration, but you must ensure there is enough money in the paying account.

If you expect to carry debt, evaluate the borrowing cost before rewards. You can build a budget using our take-home pay calculator without applying for another card.

Is a reward current account an alternative?

It may reward different payments, such as specified household direct debits, and has its own fees and qualification rules. Use our current-account rewards guide to compare the net value of the payments you actually make. Do not count the same payment twice unless the terms genuinely allow both rewards.

What should I check before applying?

Record the rate, cap, fee, excluded spending, payment frequency, expiry conditions and eligibility-check process from the issuer's current documents. Save those terms with the date checked. If you have limited UK credit history, start with our eligibility guide.

Examples and arithmetic checked 16 September 2026. No provider pricing or approval is implied.