Debt Snowball vs Debt Avalanche: UK Examples

For people who have already decided to focus their spare cash on one debt at a time (see the debt repayment guide) and now need to choose which debt to attack first. The two mainstream answers — Snowball and Avalanche — disagree on the ordering, and the right choice depends as much on your psychology as on the maths. This guide puts them side by side with the same set of debts so the trade-off is visible.

The shared foundation

Both methods keep the minimum payment on every debt and direct all spare cash at a single target. When that target is cleared, its full payment (minimum + extra) rolls onto the next target — the "snowball" effect. They differ only in how the target is chosen.

Side by side: the same three debts

A borrower has £200 of extra cash each month and three debts:

• Store card: £500 balance, 24% APR, £25 minimum.
• Credit card: £3,000 balance, 19% APR, £60 minimum.
• Car loan: £8,000 balance, 6% APR, £200 minimum.

Here the methods agree — the smallest balance also has the highest APR — so the Snowball's quick win and the Avalanche's maths point the same way. The disagreement only appears when the largest balance carries the highest rate.

When they disagree

Suppose the £8,000 car loan carried 24% APR instead of 6%. The Avalanche would attack it first — but at £200 extra against an £8,000 balance, the first debt would not vanish for around two years, and many borrowers give up before seeing a single balance hit zero. The Snowball would still clear the £500 store card in under three months, delivering the early win that keeps the plan alive. The Avalanche saves more money in theory; the Snowball succeeds more often in practice. A plan you finish beats one you abandon.

A hybrid that often works well

Many people start with the Snowball to clear two or three small balances and build momentum, then switch to the Avalanche to crush the remaining large, high-rate debts mathematically. There is no rule against switching — the method serves the goal, not the other way round.

Two things that override both methods

• Payday loans. With APRs that can run into four figures, these destroy any behavioural strategy — attack them immediately regardless of balance size.
• Rolling payments over. When a debt clears, that payment must roll onto the next target, not back into your lifestyle. Absorbing it into spending breaks the snowball effect entirely.

Limitations

Both methods assume you can meet all minimums and find extra cash. If you are in arrears or cannot cover essentials, optimisation is not the right tool — contact StepChange or Citizens Advice for formal help. Build your custom month-by-month timeline with the Debt Snowball Calculator and find your extra cash with the Budget Planner.