Debt Snowball vs Avalanche Method: Which Pays Off Debt Faster?

The snowball method, popularised by Dave Ramsey, focuses on paying off your smallest balance first — regardless of interest rate. You pay minimum payments on all debts, then throw every spare pound at the smallest balance. When that's cleared, you take the total payment you were making on it and add it to the minimum payment on the next smallest debt. This creates a 'snowball' effect — your payment amount grows as each debt is cleared.

The avalanche method focuses on the highest interest rate debt first — regardless of balance size. You pay minimums on all debts and put every extra pound towards the debt charging the most interest. This minimises the total interest paid across all your debts. When the highest-rate debt is cleared, you move to the next highest rate. Mathematically, this is the optimal strategy for reducing total debt fastest.

Let's use a realistic UK example. You have: Credit card A — £800 at 25% APR (minimum £25). Credit card B — £3,000 at 19% APR (minimum £75). Personal loan — £5,000 at 12% APR (minimum £120). Total minimum payments: £220/month. You have £350/month to put towards debt (£130 extra). Snowball: Clear card A first (8 months), then card B (about 18 months), then loan (about 12 months). Avalanche: Clear card A first (same — it's both smallest AND high APR), then card B, then loan. In this example the results are similar. The difference is most pronounced when your smallest debt has a low interest rate.

The honest answer: the best method is the one you'll actually stick to. Research from Harvard Business School found that people who use the snowball method (targeting smallest balance) are significantly more likely to clear their debt entirely — even though the avalanche method saves marginally more money. If you're disciplined and motivated by numbers, use avalanche. If you've tried before and lost motivation, use snowball. The difference in total interest is often smaller than people think.