The average UK adult carries approximately £4,200 in unsecured consumer debt — credit cards, personal loans, buy-now-pay-later arrangements, overdrafts. Total UK consumer credit outstanding is currently over £230 billion. Most of it is costing between 20 and 40 percent per year in interest.
That is not a minor inconvenience. It is a wealth-destroying machine working against you every single day.
Until the 1980s, consumer credit in Britain was relatively constrained. Financial deregulation changed that. American-style consumer lending arrived with force. Credit card companies competed aggressively for customers, lending criteria loosened, and debt became easier to access and harder to escape.
Buy-now-pay-later services extended this to a new generation, making debt almost invisible. A £300 purchase split into twelve instalments does not feel like borrowing. That is precisely the point.
An average credit card in the UK currently charges approximately 22 percent APR. If you carry a £2,000 balance and make only the minimum payment each month, it takes approximately 25 years to pay off — and you pay around £3,500 in interest on top of the original £2,000. You borrowed £2,000. You paid back £5,500.
The mathematics of high-interest debt is the inverse of compound investing. Compound growth in an ISA works for you. Compound interest on a credit card works against you — at the same exponential rate, in the wrong direction.
Highest priority: credit cards above 10% APR, payday loans, buy-now-pay-later balances with deferred interest, unauthorised overdrafts. These must be cleared before meaningful investing begins.
Middle priority: personal loans at moderate rates, authorised overdrafts, student loans. Student loans in England operate on an income-contingent repayment model — for many people, the correct financial decision is not to overpay them.
Lowest priority: mortgages and other low-rate secured borrowing. At typical mortgage rates, investing in a diversified portfolio that historically returns more is mathematically preferable to overpaying.
List all your debts by interest rate, highest to lowest. Pay the minimum on everything. Direct every additional pound at the highest-rate debt. When it is cleared, redirect that payment to the next highest. Repeat.
This is mathematically optimal — you pay less total interest and clear debt faster than any other approach. For those who need psychological wins to stay motivated, the Debt Snowball (clearing smallest balances first) also works. The best strategy is the one you actually stick to.
High-interest debt is the highest-return investment most indebted people can make. Paying off a 22 percent credit card is a guaranteed 22 percent return. Get clear. Stay clear. Then build.
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