At first glance, credit cards that charge 0% interest for a longer period sound like a good deal for consumers. After all, paying 0% is surely better than paying 20%, or more. But are these 0% promotional offers good or bad for consumers?

ClearScore is a credit broker, not a lender.

Buying What We Can’t Afford

Credit card debt is nearly at a record high in the UK - according to the latest figures from the Bank of England, credit card lending has grown and is now over £2,600 per UK household.

Credit card lending accounts for a third of average unsecured credit lending in the UK (excluding student loans), which stands at over £8,300 per household. Much of this lending is in the form of 0% purchases cards (0% purchase cards remain popular, accounting for approximately 42% of total credit card lending in 2023 as consumers increasingly opt for flexible credit options).

Trouble can start when consumers use a 0% card to make purchases they can't pay off by the end of the promotional period. And without monthly interest payments to pay, cardholders may be comfortable carrying higher levels of debt than they would normally. If care isn't taken, personal debt levels can creep higher and higher.

Losing Your 0% Interest Promotional Period

Care must be taken not to lose the 0% promotional period. Consumers can really end up in a bind if they are depending on 0% interest but the promotion comes to a premature and they revert to the stated interest rate on the card.

How can you lose a 0% interest promotion? By missing a monthly payment or exceeding the credit limit during the promotional period. Doing so violates the terms of most cards and brings the 0% period to a premature end. One little mistake and you’ll be stuck paying the stated rate on your remaining balances - easily 19.9% but your rate could be 2X or 3X as high as that.

Credit card companies don’t make money during 0% interest periods - they lose money because they're lending money for free. How do they make this up? When cardholders pay interest or fees.

Since issuers are continuing to hand out 0% interest cards like there's no tomorrow, it’s a sure bet that lots of cardholders are either violating the terms of their promotional periods (so they lose the 0% promotion and pay their stated interest rate) and/or carrying balances beyond the promotional periods - in either case, consumers can end up paying at least 18.9% interest on their "0%" cards.

Balance Transfer Cards Have the Same Problem

Borrowing face a similar issue with balance transfer cards if they don't make their payments on time or exceed the credit limit. Additionally, cardholders won't get a 0% rate if the balance isn't transferred within a window that's usually 60 or 90 days from account opening.

Can a 0% Card Ever be Beneficial?

There are, of course, circumstances when a 0% card can be useful. Perhaps the boiler conked out, the car broke down and the children need new shoes - all in one month. In these cases it can be helpful to get a few months of breathing space where you are making monthly payments, but they're going strictly towards paying down your debt, not interest charges.

In short, 0% cards can be useful for consumers who use them to actively improve their personal finances (e.g., reduce their debt levels). But for consumers who use promotional periods to keep on shopping while postponing debt repayment, 0% cards with longer and longer promotional periods can be bad news indeed.

• Bank of England