Debt snowball vs avalanche: which one actually gets you debt-free faster?

If you carry more than one balance — a credit card, a car loan, a buy-now-pay-later plan — the order you pay them in changes both how much interest you pay and how likely you are to stick with the plan. Two methods dominate the conversation: the snowball and the avalanche.

The avalanche: cheapest on paper

Pay the minimum on everything, then throw every spare pound or dollar at the debt with the highest interest rate. When it clears, roll that payment into the next-highest rate. Mathematically this always costs the least total interest, because you are killing the most expensive money first.

The snowball: fastest wins

Same idea, but you order by smallest balance instead of highest rate. You clear individual debts sooner, which means fewer accounts, fewer due dates, and visible progress early. For many people that momentum is the difference between a plan they finish and a plan they abandon in month three.

How to choose

• If your rates are wildly different (a 29% card next to a 4% loan), avalanche saves real money — take it.
• If your rates are similar, the difference is small; pick snowball for the motivation.
• If you have abandoned a payoff plan before, pick snowball. The cheapest plan is the one you actually finish.

Run it against your own numbers

Generic advice stops being useful the moment your real balances, rates and minimums are on the table. In MoneyQuilt you can add every debt — cards, loans, BNPL plans, money owed to family — and see both payoff orders side by side, with a projected debt-free date and total interest for each. Then log payments as you make them and watch the date move.