Comparison
Debt snowball vs avalanche: comparing payoff orderings
Compare estimated months, interest, and payoff order for snowball versus avalanche using the same illustrative balances, APRs, minimums, and extra payment — educational estimates, not advice.
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Snowball and avalanche use the same monthly cash budget. They differ only in which debt receives leftover cash after minimums. This page runs one shared illustrative debt set through both orderings so you can see how payoff order, months, and estimated interest can diverge when everything else is held constant.
What differs
- Target selection after minimums: lowest remaining balance (snowball) versus highest APR (avalanche).
- Estimated payoff order, months to finish, and total interest under identical debts and extra payment.
Illustrative scenario results
Illustrative DP-01 set: Card $5,000 @ 22% (min $150), Personal $3,000 @ 12% (min $100), Auto $8,000 @ 7% (min $200), plus $200 additional monthly payment.
| Strategy | Est. months | Est. total interest | Est. total paid | Payoff order |
|---|---|---|---|---|
| Snowball (lowest balance first) | 35 | $2,705.91 | $18,705.91 | Personal → Card → Auto |
| Avalanche (highest APR first) | 34 | $2,292.53 | $18,292.53 | Card → Personal → Auto |
- Estimated interest difference (snowball − avalanche): $413.38
- Estimated time difference (snowball − avalanche months): 1
How to read these results
Under these illustrative inputs, avalanche shows lower estimated total interest and a slightly shorter payoff than snowball, while snowball clears the smallest balance first. The interest gap comes from targeting higher APRs sooner. Neither ordering is presented as the right choice for a person — only as two mechanical paths under the same assumptions.
When each approach may be useful to explore
These notes describe situations where comparing the paths can be informative. They are not recommendations.
- Snowball ordering: You want to see how clearing the smallest balance first changes estimated timelines and interest under a fixed payment budget.
- Avalanche ordering: You want to see how targeting the highest APR first changes estimated interest and months under the same budget.
Run your own numbers
This page uses fixed illustrative assumptions. For estimates based on inputs you control, open the Debt Payoff Calculator.
Assumptions
- Debts, APRs, minimums, and the additional monthly payment are illustrative assumptions from the documented DP-01 scenario set — not a claim about your accounts.
- Fixed APR and fixed minimum per debt; no new charges, fees, or penalty APRs.
- Additional monthly payment is constant every month.
- Tie-breaker for equal balances or APRs: debt name ascending.
Limitations
- Does not model credit scores, hardship programs, or settlement offers.
- Behavioral stickiness is outside the simulation.
- Results are estimates under these assumptions only.
Methodology
- Both strategies call the debt payoff engine (CALCULATOR-SPECS §2) with identical debts and additional payment.
- Each month: accrue interest, fund minimums on active debts, then apply leftover cash to the strategy target with same-month waterfall.
- Interest difference = snowball total interest − avalanche total interest.
Data provenance
Scenario debts and additional payment match the documented DP-01/DP-02 illustrative set. Outputs are computed by the debt payoff engine.
- Debt payoff methodology: docs/CALCULATOR-SPECS.md §2 (as of 2026-09-09)
- Illustrative oracle scenario DP-01/DP-02: docs/CALCULATOR-TEST-CASES.md §2 (as of 2026-09-09)
- Scenario dataset: data/pseo/comparisons/snowball-vs-avalanche.ts (as of 2026-09-09)
Balances and APRs are illustrative test-case assumptions, not market averages. Re-run with your own inputs on the calculator.