Debt snowball vs avalanche: which is better in the UK?
Both methods work, and both beat paying the minimum on everything. The difference is the order you attack your debts in, and that changes how motivated you stay and how much interest you pay.
Free calculator: Debt payoff calculator: compare both methods with your own debts
Before you start: priority debts come first
In the UK, some debts carry much more serious consequences than others. Pay these first, before any snowball or avalanche:
- Rent or mortgage arrears (risk of losing your home)
- Council tax arrears (councils can use bailiffs or take money from wages or benefits)
- Gas and electricity arrears
- Court fines and child maintenance
- TV Licence, and HMRC tax owed
Credit cards, overdrafts, personal loans, store cards, catalogues and buy-now-pay-later are non-priority debts. They're the ones the snowball and avalanche methods are for. If you're behind on priority debts, speak to StepChange or National Debtline first. Both are free, and they can tell you about Breathing Space, a scheme in England and Wales that pauses most interest, charges and enforcement for 60 days while you get advice.
The two methods
With both methods you pay the minimum on every debt, then put every spare pound on one target debt. When the target is cleared, everything you were paying on it rolls on to the next target. Your total monthly payment stays the same, but more of it goes to the target each time. That's the "snowball" effect, and both methods use it.
| Debt snowball | Debt avalanche | |
|---|---|---|
| Target first | Smallest balance | Highest APR |
| Main benefit | Quick wins that keep you motivated | The least interest, mathematically |
| Best for | Lots of small debts, or if you've given up before | Big, high-APR card balances, and disciplined savers |
A worked example
Suppose you can put £500 a month towards these debts:
| Debt | Balance | APR | Minimum |
|---|---|---|---|
| Credit card | £2,400 | 24.9% | £72 |
| Overdraft | £650 | 39.9% | £25 |
| Car finance | £5,200 | 8.9% | £180 |
| Klarna | £180 | 0% | £45 |
Our calculator estimates that both methods clear everything in 19 months. Snowball (Klarna → overdraft → credit card → car) costs about £942 in interest, and avalanche (overdraft → Klarna → credit card → car) about £930. The difference is only around £12. That's typical: when balances are modest, the method you'll actually stick to matters far more than the method that's mathematically best. The gap grows when you have a large balance on a very high APR.
UK tips that speed up either method
- 0% balance transfer cards can stop interest on card debt for a year or more. Check the transfer fee (often around 3%), and make sure you can clear the balance before the 0% period ends.
- Overdrafts often charge around 35–40% a year. Moving an overdraft onto a cheaper product, or simply targeting it first, usually pays off.
- Persistent credit card debt: if you've paid more in interest and charges than off the balance for 18 months, your card provider has to contact you about it under FCA rules. Respond and ask about a repayment plan.
- Don't keep spending on the cards you're clearing. Move subscriptions to a debit card.
- Windfalls (tax rebates, bonuses, selling things) go straight onto the target debt.
When neither method is enough
If your budget can't cover all your minimum payments, a snowball won't fix it. Free debt advice can set up a debt management plan, or explain other options such as a Debt Relief Order or an IVA, with no fees. Avoid companies that charge for debt help: MoneyHelper lists free services.
Up to 10 debts, snowball or avalanche, a debt-free date, interest totals and a month-by-month plan, in Google Sheets and Excel.
See the template →
FAQs
Which is faster, snowball or avalanche?
Avalanche is never slower and usually costs a little less interest. In practice the debt-free date is often the same or within a month, so pick the method you'll stick to.
Should I save or pay off debt?
Keep a small emergency buffer (even £500–£1,000) so a surprise bill doesn't go on a card, then put everything else on high-interest debt. Debt at 25% APR costs far more than savings earn.
Related calculators & guides
Pay off your overdraft? · Debt payoff calculator · 50/30/20 budget · No-spend challenge · Subscription costs
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