Debt snowball vs avalanche

The two methods

Both start the same way: pay the minimum on every debt, and put every spare dollar into exactly one of them. They differ only in which one.

Avalanche targets the highest interest rate first, regardless of balance. When it clears, its payment rolls onto the next-highest rate.

Snowball targets the smallest balance first, regardless of rate. When it clears, its payment rolls onto the next-smallest.

Everything else — the minimums, the rolling payment, the total monthly budget — is identical.

Worked comparison

Three debts, $600 a month available:

Here the two methods agree on the first target — the store card is both the highest rate and the smallest balance — and diverge after that. Where the smallest balance also carries the lowest rate, the divergence is larger and the avalanche's advantage grows.

Put your own figures into the debt payoff calculator: it runs both methods on the same inputs and shows the interest and months for each, so you are choosing on your numbers rather than on a rule.

Why avalanche always wins on cost

Interest accrues on balances at their own rates. Every dollar sent to a 26.9% debt saves 26.9 cents a year; the same dollar sent to a 6.5% debt saves 6.5 cents. Directing money to the highest rate available at every moment is optimal by construction, and no arrangement of the same payments can beat it.

The size of the win depends on how far apart your rates are. Debts spanning 6% to 27% produce a large gap. Three cards all around 20% produce almost none — in which case the methods are nearly equivalent and you should simply pick the smallest balance for the momentum.

Why snowball sometimes wins in practice

Debt repayment fails when people stop, not when the arithmetic is wrong.

Closing an account entirely — one fewer statement, one fewer minimum, visible progress — is a different experience from watching a large balance fall slowly. There is research suggesting people are more likely to persist when they see accounts eliminated. If a full clearance in month four keeps you going and a slow grind through month eighteen does not, the snowball's higher interest cost may be the cheaper option overall.

The honest test: run both, look at the difference, and ask whether that amount is worth the extra motivation. A few hundred dollars over three years may well be. Several thousand is a different conversation.

What matters more than either

The amount you put in. Both methods use the same $600 in the example above; raising it to $750 shortens the payoff more than the choice of method does.

The rolling payment. Keeping the total constant as debts clear — rather than letting your spending absorb the freed-up minimum — is what accelerates the tail end. This is the actual engine, and both methods share it.

Not adding new debt. A repayment plan running alongside continued card spending is not a repayment plan.

If neither is affordable

If your combined minimums exceed what you can pay, ordering is not your problem. Contact your creditors before missing a payment — hardship programs exist and are far more available in advance than after default. Nonprofit credit counseling agencies offer free budget reviews and can negotiate a debt management plan.

Be careful with for-profit debt settlement. Charging fees before settling a debt is generally prohibited, and the approach typically involves deliberately missing payments, which damages your credit and may not work.