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The avalanche method directs extra payments to the debt with the highest interest rate first, while making minimum payments on everything else. Once that debt is paid off, the freed-up payment rolls to the next highest rate. This minimizes total interest paid.

The snowball method targets the smallest balance first, regardless of interest rate. You get faster “wins” as small debts disappear, which research shows helps people stay motivated. Dave Ramsey popularized this approach. The gain is in persistence, not in interest cost.

When Avalanche Comes Out Ahead

Avalanche saves the most money when there is a wide spread between your highest and lowest interest rates. A 24% credit card vs. a 5% car loan is an obvious avalanche case—every dollar on the credit card saves nearly 5x as much interest.

When Snowball Costs About the Same

When interest rates across debts are similar (e.g., all credit cards in the 18–22% range), the interest cost difference is small. The snowball trades that difference for eliminating a debt sooner. The trade costs the least when a small debt clears in 1–2 months.

Mechanics Common to Both Strategies

• Missing a minimum payment on any debt triggers penalties and credit damage.
• Automatic payments remove the chance of missing one.
• Both timelines assume a freed-up payment rolls into the next debt. Cash absorbed into spending instead stretches the payoff.
• A balance transfer (0% intro APR) or consolidation loan changes the effective rate; a 3–5% transfer fee counts against the reduction.
• Without a cash buffer, an unexpected expense goes back onto the card. $1,000–$2,000 is the commonly cited starter amount.