Debt Snowball vs. Avalanche: Compare Order and Interest

The shared foundation

Both methods begin by covering required minimum payments on every account. Then the available extra goes to one target. Once that target is paid, money can move to the next debt.

The CFPB's reducing debt worksheet presents the interest-cost and motivation tradeoffs. Neither method requires a fixed income or identical extra payment every month.

Before ranking debts, record balances, rates, required payments, due dates, and special terms. Promotional periods, deferred interest, collateral, fees, and debt-specific relief options may make a simple ranking incomplete.

Worked example: equal payments, different allocation

Assume monthly interest is APR divided by 12, charged before payment. There are no new purchases, fees, or rate changes. Debt A is $1,000 at 12% with a $50 minimum. Debt B is $3,000 at 24% with a $100 minimum. The total monthly payment budget is $350, including $200 extra.

The first month's total is the same because interest was calculated before these payments. Next month's opening-balance interest differs: snowball produces $7.60 + $59.20 = $66.80; avalanche produces $9.60 + $55.20 = $64.80. Avalanche has reduced the next charge by $2.

This does not establish the full payoff period. That requires continuing the schedule, capping final payments, and reallocating money after each payoff.

Make the calculator comparison fair

Enter the same starting date, balances, APRs, minimums, and total extra payment for both runs. Save the stated interest convention. A calculator using monthly interest can differ from a card statement that uses daily balances and actual payment dates.

For variable income, test a low extra payment and a higher one as scenarios. If the tool accepts only a constant amount, do not label the result a simulation of an irregular sequence. A manual monthly schedule can represent that sequence directly.

Choose with the cost visible

Someone who values eliminating an account may accept the modeled interest difference. Someone focused on interest cost may prefer the highest-rate order. A hybrid can be modeled too, such as clearing one small account and then switching to avalanche.

Do not assume the cost difference is always small or that either method has a guaranteed completion date. The important comparison is between plans with the same affordable cash commitment.

If required payments exceed available money, optimizing the extra-payment order is no longer the immediate problem. Address the budget gap and contact lenders about options. The irregular-income budget guide helps identify timing and affordability shortfalls.