Debt Payoff Strategies UK: Avalanche vs Snowball Method

If you have multiple debts, the order you pay them off matters more than most people realise. Two methods dominate, and they work on completely different logic.

The avalanche method targets the highest interest rate first. You pay the minimum on every debt, then direct every spare pound at the most expensive one. Once that is cleared, you roll the full payment into the next highest rate. Mathematically, this is always the cheapest route. It minimises total interest paid, sometimes by hundreds of pounds.

The catch is motivation. If your highest-rate debt is also your largest, it can take months before you see a balance meaningfully shrink. Some people stick with it. Others stall.

The snowball method ignores interest rates entirely and targets the smallest balance first. Pay the minimum everywhere, throw extra money at the smallest debt, and when it is gone, roll that payment into the next one. The quick wins create momentum that keeps people on track. The trade-off is paying slightly more interest overall.

A hybrid approach works well for most people: use avalanche for anything above 20% APR, because expensive debt is genuinely urgent, then switch to snowball for the remaining lower-rate debts to keep the momentum going.

The best method is whichever one you will actually follow through on. A psychologically sustainable plan beats the mathematically optimal plan you abandon after three months.