When several debts are active, a repayment sequence can change modeled interest cost, the number of open accounts, and monthly cash-flow simplicity. It does not create one universally correct order.
Quick answer
Debt avalanche prioritizes the highest contractual interest rate. Debt snowball prioritizes the smallest outstanding balance. Other approaches may prioritize liquidity, contractual restrictions, cash-flow simplification, or a balance that creates repeated payment stress.
All else equal, directing the same extra payment to the highest-rate debt generally minimizes modeled interest cost. Actual choices can differ when fees, prepayment terms, collateral, emergency liquidity, or the likelihood of sustaining the plan matter.
Compare the methods
Avalanche
Make each required payment, then direct the available extra amount to the debt with the highest effective contractual rate. After that balance closes, redirect the released payment to the next selected debt.
Snowball
Make each required payment, then direct the extra amount to the smallest balance. This can reduce the number of accounts sooner, but may produce a higher modeled interest cost than avalanche when the smallest balance has a lower rate.
Other sequences
A household may compare fees, foreclosure or prepayment terms, secured versus unsecured exposure, payment-date complexity, and near-term liquidity. Consolidation or refinancing is a new credit decision: compare rate, fees, remaining tenure, collateral, total cost, and the risk of rebuilding balances before treating it as useful.
Illustrative scenario
Illustrative scenario: a household has three balances with different rates and can add a fixed amount each month after required payments. An avalanche model sends that amount to the highest-rate balance; a snowball model sends it to the smallest. The comparison is valid only with the same payment amount, dates, fees, and loan terms.
Common mistakes
- Comparing rates without including fees and prepayment terms.
- Using emergency cash without considering the resulting liquidity position.
- Assuming consolidation automatically lowers total cost.
- Treating a modeled sequence as a recommendation for every household.
What to do next
List each balance, contractual rate, required payment, remaining tenure, fees, and prepayment terms. Model more than one sequence and review liquidity before selecting an approach.