The Debt Snowball Method

Popularised by personal finance author Dave Ramsey, the debt snowball focuses on eliminating debts from smallest to largest balance — regardless of interest rate.

How it works:

  1. List all debts from smallest to largest outstanding balance
  2. Make minimum payments on every debt
  3. Put every extra pound you can afford at the smallest debt
  4. When smallest debt is paid off, roll its full payment to the next smallest
  5. Repeat until all debts are cleared
ℹ️ Why it works psychologically

Paying off a debt completely — however small — creates a genuine sense of achievement. Research by academics at the University of Michigan found that people who focus on one debt at a time (regardless of interest rate) are more likely to eliminate all their debt than those who spread payments across debts. The "snowball" name describes the rolling payment that grows larger as each debt is cleared.

The Debt Avalanche Method

The debt avalanche is the mathematically optimal approach. You target the highest interest rate debt first — saving the maximum amount of money overall.

How it works:

  1. List all debts from highest to lowest interest rate (APR)
  2. Make minimum payments on every debt
  3. Put every extra pound at the highest-rate debt
  4. When it's paid off, roll its payment to the next highest rate
  5. Repeat until all debts are cleared

The avalanche saves more money because you're eliminating the most expensive debt first — every month you carry high-interest debt costs you significantly more than carrying low-interest debt of the same size.

Side-by-Side Example: Same Debts, Different Methods

Imagine you have three debts and £300/month total to put toward repayment (minimum payments covered):

DebtBalanceAPRMin Payment
Credit card A£80028%£25
Personal loan£3,20012%£80
Car finance£6,0006%£120
Snowball order

Pay: Card A → Loan → Car

Card A (smallest) cleared first. Extra £95/month (£300 − £80 − £120 − £5 spare) goes to it. Motivational win quickly. Costs slightly more in total interest because 6% car loan cleared last, but 28% card gone in ~4 months.

Avalanche order

Pay: Card A → Loan → Car

In this example, smallest debt and highest rate happen to be the same (Card A at 28%). Both methods produce identical results here — which shows that when the highest-rate debt is also small, both strategies agree.

The strategies diverge when the highest-rate debt is also the largest. In that scenario, the snowball would clear a small low-rate debt first for a quick win, while the avalanche would grind away at the large high-rate debt — potentially for years before the first payoff.

Which Should You Choose?

Choose snowball if...

You need motivation

You've tried paying off debt before and given up. You have several small debts you could clear quickly. Psychological momentum matters more to you than mathematical optimisation. You're dealing with the emotional burden of debt and need wins to keep going.

Choose avalanche if...

You're disciplined

You can stay committed to a long-term plan without needing quick wins. You have a high-interest debt (credit card, payday loan) that is costing you significant money monthly. You want to minimise total interest paid and can handle the slower progress of tackling a large balance first.

✅ Hybrid approach

Many debt advisers recommend a hybrid: use the snowball to clear any very small debts quickly (anything under £500), then switch to the avalanche for the remaining larger debts. You get the initial motivation boost without sacrificing much mathematical efficiency.

Before You Start Either Method

  • Build a small emergency fund first — £500–£1,000 in easy-access savings. Without this buffer, any unexpected expense sends you back into debt immediately.
  • Stop adding new debt — cut up or freeze the credit cards you're paying off. Both methods fail if you're adding to the balance faster than you're paying it.
  • Check for balance transfer options — if you have high-interest credit card debt, moving it to a 0% balance transfer card first can save hundreds and accelerate either strategy. Read our balance transfer cards guide.
  • Check if overpaying has penalties — personal loans sometimes have early repayment charges. Confirm before directing extra payments.

Frequently Asked Questions

Even £50/month extra makes a significant difference to your debt-free date. The key is consistency — a small but reliable extra payment every month outperforms a large occasional payment. Automate your extra payment by standing order on payday so it's never a decision. As debts clear, roll the freed-up payments into the next debt, increasing momentum over time.
High-interest debt (credit cards at 20%+, payday loans) should always be cleared before investing — you'd need to earn that rate guaranteed to break even, and no investment offers that. For lower-rate debt (personal loans at 6–10%), it's closer — a diversified equity portfolio has historically returned 7–9% annually, but with uncertainty. As a general rule: clear all debt above 8% APR before investing, and consider a split approach for debt below 8%.
Debt consolidation — combining multiple debts into one lower-rate loan — can reduce total interest and simplify repayment. It works well when you can genuinely secure a lower rate than your current debts. Risks: consolidation loans sometimes have early repayment fees; if you consolidate to a longer term, monthly payments drop but total interest can increase; and without changing spending habits, consolidating often leads to running up the cleared cards again.
Important: Educational only. If you are struggling with debt, contact a free debt advice charity — StepChange (stepchange.org), Citizens Advice, or National Debtline. Not financial advice.