How to Pay Off Debt Faster: Snowball vs Avalanche Strategy

Step 1: Know What You Owe

Before choosing a repayment strategy, you need a clear picture of every debt you have. List them all out with the balance, annual interest rate (APR), minimum monthly payment, and the rough monthly interest cost.

Here's an example debt profile we'll use throughout this guide:

Monthly interest is approximate: (balance x APR) / 12. It decreases each month as the balance reduces.

Step 2: Choose Your Strategy

There are two main approaches to paying off multiple debts. Both require you to make minimum payments on every debt, then put any spare money toward one priority debt.

With the avalanche method, you target the debt charging the highest interest rate first. In our example, that's the overdraft at 35% APR. Once that's cleared, the payment rolls into the next highest rate debt (the credit card at 22%). Mathematically, this approach always costs you less in total interest.

With the snowball method, you target the smallest balance first regardless of interest rate. In our example, that's also the overdraft (£1,500). You get a psychological boost from clearing an entire debt quickly, which keeps you motivated.

Use our debt repayment calculator to model different payment amounts and see exactly how long each debt will take to clear.

Worked Example: Avalanche vs Snowball

Let's say you have £500 per month to put toward all your debts. After covering the minimum payments (£445), you have £55 spare to direct at your priority debt. Here's how each method plays out:

In this example, the avalanche method saves around £150 in interest compared to the snowball approach. Both methods happen to pay off debts in the same order because the smallest balance (overdraft) also has the highest APR. That won't always be the case.

The real power of the avalanche shows when the highest-interest debt is also the largest. Imagine your credit card had a £6,000 balance at 22% instead. The snowball method would still tackle the £1,500 overdraft first, but the avalanche would go straight for the credit card, saving considerably more interest over the life of repayment.

With an extra £55 per month on top of the minimum £50 payment, the overdraft clears in roughly 15 months instead of dragging on for years. Once it's gone, that freed-up £105 rolls into the next target debt, accelerating the process further. This snowball effect is why both methods are so much faster than minimum payments alone.

Balance Transfer Cards

A 0% balance transfer card lets you move existing credit card debt to a new card with no interest for a promotional period, typically 12 to 24 months. This can be a powerful tool if used correctly.

Debt Consolidation

Consolidation means replacing multiple debts with a single loan at (ideally) a lower interest rate. It simplifies your finances into one monthly payment and can reduce your total interest cost, but there are trade-offs to watch for.

For impartial guidance on consolidation and other debt solutions, visit GOV.UK Debt Advice.

5 Tips to Accelerate Debt Repayment

Free Debt Help in the UK

If your debts feel unmanageable, do not ignore them. There are several organisations that provide free, confidential advice with no strings attached. They can help you create a budget, negotiate with creditors, and explore formal debt solutions if needed.