Debt snowball vs avalanche: real numbers worked through
A side-by-side worked example showing how avalanche saves $1,200 in interest vs snowball on a typical $30k debt load — plus when to pick each.
1 May 2026
The debt avalanche vs snowball debate has been beaten to death, but most articles never actually show the numbers. Here is a worked example with realistic debts so you can see exactly what each strategy costs.
The starting point: a typical debt load
Three debts, total $30,000:
- Credit Card A: $4,500 balance, 22% APR, $135 minimum/month
- Credit Card B: $8,500 balance, 18% APR, $200 minimum/month
- Personal Loan: $17,000 balance, 9% APR, $350 minimum/month
Total minimums: $685/month. Extra payment available: $400/month. Total monthly debt outflow: $1,085.
Strategy 1: Avalanche (highest APR first)
Pay minimums on everything, throw the $400 extra at Credit Card A (22% APR) until it is gone. Then roll Card A's $135 minimum + the $400 extra ($535 total) onto Credit Card B. When B is gone, roll everything onto the personal loan.
Total time to debt-free: ~38 months
Total interest paid: ~$5,300
Strategy 2: Snowball (smallest balance first)
Pay minimums on everything, throw the $400 extra at Credit Card A (smallest balance, also coincidentally highest APR). Then roll onto Card B. Then onto the personal loan. In this scenario, snowball matches avalanche because the smallest balance also has the highest APR.
Let's change the example to make snowball-vs-avalanche actually divergent. Imagine Credit Card A is $4,500 at 12% APR (small but low rate), Credit Card B is $8,500 at 22% APR (bigger and higher rate). Now the methods diverge:
Avalanche on the modified example
Pay extra on Card B first (22%), then Card A, then loan.
Total interest: ~$5,100
Snowball on the modified example
Pay extra on Card A first (smallest balance), then Card B, then loan.
Total interest: ~$6,400
Snowball costs $1,300 more in interest in this scenario.
So just always do avalanche?
Mathematically yes. Behaviourally, the answer is whichever you will actually stick with. The reason snowball persists despite costing more interest:
- Killing one debt entirely (even a small one) gives a real psychological win.
- Wins compound — momentum keeps people paying down debt for the full multi-year journey.
- Quitting halfway through avalanche costs more than completing snowball.
The hybrid that often beats both
For mixed debt portfolios:
- Pay off any debt under $1,000 first (small enough to clear in 1-2 months — fast win)
- Then switch to avalanche on the remaining debts
You get one quick psychological win, then maximum interest savings on the bigger debts.
The variable that beats both methods: extra payment amount
In the example above, going from $400 extra/month to $700 extra/month finishes the same debt 14 months earlier and saves $2,800 in interest — far more than the avalanche-vs-snowball difference. How much extra you can put toward debt matters more than which order you pay it.
Working out where the $300 extra comes from is usually a budget audit (canceling subscriptions, eating out less, etc.) — see the Budget Allocation Auditor for that side of the math.
To run the simulation on your specific debts: the free debt payoff calculator does both methods side-by-side and shows the actual debt-free date and total interest under each.
Put this into practice
Debt Payoff Planner
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