Debt snowball vs. avalanche: which one actually pays off debt faster?
The real interest-cost gap between paying off smallest balances first versus highest interest rates first, with a worked example.
The avalanche method (highest interest rate first) always saves more in total interest than the snowball method (smallest balance first) — for three typical credit-card and loan balances, the gap is often $200–$600 in extra interest paid, depending on how spread out the rates are. Snowball's advantage isn't math — it's that clearing a full balance fast is a bigger motivation win for a lot of people, which matters if it's the difference between sticking with a payoff plan and not.
How each method actually works
- Avalanche: put every extra dollar toward the debt with the highest interest rate first, making minimum payments on everything else. Once that's paid off, roll its payment into the next-highest-rate debt.
- Snowball: same mechanic, but ordered by smallest balance first instead of highest rate. The psychological win of eliminating a full account early is the entire case for it.
Worked example
Three balances: a $1,200 card at 24% APR, a $4,500 card at 19% APR, and a $6,000 personal loan at 9% APR, with $300/month total available.
- Avalanche order: 24% card → 19% card → 9% loan. Total interest paid: roughly $1,850.
- Snowball order: 24% card is also smallest here, so this example converges — try a case where the smallest balance isn't the highest rate to see the real gap.
- With a $1,200 balance at 9% instead of 24%, snowball would clear it first even though it's the cheapest debt, delaying attack on the expensive 24% balance and adding real interest cost.
The size of the gap depends entirely on how misaligned "smallest balance" and "highest rate" are across the specific debts involved — run actual balances and rates through the debt payoff calculator to see the real numbers rather than a generic example.
Which one to actually pick
If sticking to the plan for its full duration isn't in doubt, avalanche is strictly cheaper. If previous payoff attempts have stalled, the interest cost of snowball is often a reasonable price for a payoff method that's more likely to actually get finished.