Guide · Debt
Snowball vs Avalanche: Which Debt Payoff Method Is Faster?
Two strategies, one goal. The difference is which debt you attack first — and that choice can save (or cost) you hundreds of pounds in interest.
The two methods, explained
Both methods follow the same mechanic: pay minimums on all debts, then throw every spare pound at one target debt until it's gone, then roll that payment into the next target. The only difference is the order.
❄️ Snowball
Target the smallest balance first, regardless of interest rate. Once paid off, roll the freed payment into the next smallest. Fewer accounts faster → quick psychological wins.
🏔️ Avalanche
Target the highest interest rate first, regardless of balance. Mathematically optimal — you minimise the total interest paid over the entire payoff period.
A real comparison with numbers
Imagine three debts and £400/month to throw at them (after minimums):
| Debt | Balance | Rate | Minimum |
|---|---|---|---|
| Credit card A | £1,200 | 24% | £30 |
| Personal loan | £5,000 | 12% | £100 |
| Credit card B | £3,500 | 19% | £70 |
Snowball order: Credit card A (£1,200) → Credit card B (£3,500) → Personal loan (£5,000).
Avalanche order: Credit card A (£1,200 at 24%) → Credit card B (£3,500 at 19%) → Personal loan (£5,000 at 12%).
In this example the orders happen to be almost identical — Credit card A is both the smallest and the highest rate. The avalanche wins when high-rate debts also have large balances that would be left to compound under the snowball approach.
Approximate figures based on the example debts above with £400/month extra payments.
Which should you choose?
The avalanche is always mathematically superior. But debt payoff is fundamentally a behavioural challenge, not a maths problem. Research consistently shows that people who see accounts close — even if those accounts weren't the most expensive — are more likely to stick with their plan.
Choose snowball if you have several small debts and need the motivation of closing accounts quickly, or if the interest-rate difference between your debts is small (under 5%).
Choose avalanche if you have a high-rate debt (credit card at 20%+) with a significant balance, and you're confident you'll stay disciplined even when progress feels slow.
The best method is the one you actually stick to.
Frequently asked questions
Which method saves the most money?
The avalanche method always saves more in total interest because you eliminate the highest-rate debt first, reducing the balance that compounds at that rate. The snowball may pay more interest overall, but the difference is often smaller than people expect — especially if balances are similar.
Which method pays off debt fastest?
It depends on your specific debts. The avalanche is faster when your highest-interest debts are also large, because you reduce the most expensive compounding earliest. But if your smallest debts happen to also carry high rates, the snowball and avalanche converge to the same result.
What if I can't decide? Is there a hybrid approach?
Yes — many people pay off one small debt first to build momentum, then switch to avalanche order for the rest. This hybrid captures the psychological benefit of an early win without sacrificing much on total interest. The debt payoff calculator lets you set custom order.
Should I pay off debt or invest?
If your debt interest rate is higher than the expected return on your investments (roughly 5–7% for a diversified portfolio), pay off debt first. Credit cards at 20%+ should almost always be cleared before investing. Low-rate debts like 0% deals may be worth holding while investing, depending on your situation.