If you carry multiple debts — a credit card at 22%, a car loan at 8%, a personal loan at 14% — the question is not whether to pay them off, but in what order.
Two strategies dominate this decision: the Debt Avalanche and the Debt Snowball. Both work. Both are better than the default (paying minimums and hoping for the best). But they work differently, optimise for different things, and suit different psychological profiles.
The Debt Avalanche Method
How It Works
List all your debts from highest to lowest interest rate. Pay minimums on every debt, then throw all extra money at the highest-rate debt. Once it is paid off, redirect that freed payment to the next highest rate debt. Repeat.Example
| Debt | Balance | Rate | Minimum | |:---|:---|:---|:---| | Credit Card A | £5,000 | 22% | £100 | | Personal Loan | £8,000 | 14% | £180 | | Car Loan | £12,000 | 8% | £240 |With £700/month total to spend on debt, you pay minimums on the car loan and personal loan (£420), then blast £280 at Credit Card A — the highest rate.
The Math Advantage
The avalanche method minimises total interest paid. In the example above, it could save you £1,200–£2,000 in interest compared to the snowball method over the payoff period. For high-rate debts, the savings can be much larger.Who It Suits
The Debt Snowball Method
How It Works
List all your debts from smallest to largest balance — ignoring the interest rate. Pay minimums on everything, then throw all extra money at the smallest balance. Once it is paid off, roll that payment into the next smallest. The "snowball" grows as you eliminate each debt.Example
Using the same debts as above, reordered by balance: | Debt | Balance | Rate | Minimum | |:---|:---|:---|:---| | Credit Card A | £5,000 | 22% | £100 | | Personal Loan | £8,000 | 14% | £180 | | Car Loan | £12,000 | 8% | £240 |In this case the order happens to be the same. But if Credit Card A had a balance of £2,000 instead, the snowball would target it first — even though the personal loan has a higher rate.
The Psychology Advantage
Research from the Harvard Business Review found that people who use the snowball method pay off debt faster in practice — even though the avalanche is mathematically superior. Why? Because paying off a complete debt creates a powerful psychological win. That momentum keeps people engaged for the long payoff journey.Dave Ramsey, the populariser of the snowball method, put it simply: "Personal finance is 20% head knowledge and 80% behaviour."
Who It Suits
Avalanche vs Snowball: A Direct Comparison
| | Debt Avalanche | Debt Snowball | |:---|:---|:---| | Order | Highest rate first | Smallest balance first | | Total interest paid | Lower (mathematically optimal) | Higher (by varying amounts) | | Time to first paid-off debt | Usually longer | Usually shorter | | Psychological motivation | Requires discipline | Provides early wins | | Best for | Efficient savers | Motivation-focused |
The Hybrid Approach
You do not have to pick one. Many financial advisors suggest:
This gives you the psychological benefit of early wins with the mathematical efficiency of the avalanche for the bulk of your debt.
How to Calculate Your Debt-Free Date
Knowing your payoff date changes everything. Instead of debt feeling like an open-ended burden, it becomes a defined problem with a specific end point.
Our Debt Payoff Calculator — launching soon — will show you:
Until it launches, you can use a free tool like Undebt.it for the full payoff schedule.
After You're Debt-Free
The most powerful moment in the debt payoff journey is when the last payment clears. That full payment amount — previously going to interest and principal — is now available for building wealth.
If you were paying £700/month on debt and your last debt is paid off:
This is why debt freedom is not just about reducing stress — it is the launchpad for the compound interest phase of your financial life. Check our Compound Interest Calculator to see what that freed payment becomes over time.
Conclusion
Choose the avalanche if you are motivated by efficiency and numbers. Choose the snowball if you need momentum and early wins. Both are infinitely better than the alternative.
The best strategy is always the one you will actually follow.
Calculate your compound interest after becoming debt-free →