Debt Snowball vs Avalanche: We Ran Both on the Same $18,400
The avalanche costs $227 less. The snowball gets more people to the finish line. Here is the same $18,400 debt run through both, month by month.
The avalanche method pays the highest interest rate first and always costs less. The snowball method pays the smallest balance first and is finished by more people. On a typical mixed debt load the avalanche saves a couple of hundred dollars — and the snowball saves the plan.
Below is the same $18,400 debt run through both methods with an identical $650 a month, so you can see exactly what the choice costs and what it buys.
The test case
| Debt | Balance | APR | Minimum |
|---|---|---|---|
| Store card | $1,100 | 26.9% | $35 |
| Credit card A | $4,800 | 22.4% | $120 |
| Credit card B | $2,700 | 18.9% | $70 |
| Car loan | $9,800 | 7.4% | $265 |
| Total | $18,400 | $490 |
Both methods pay every minimum, then send the whole surplus — here $160 — at one target debt. When that debt clears, its payment joins the surplus and rolls onto the next. Only the order of targets differs.
The avalanche: cheapest by the numbers
Order by interest rate, highest first: store card (26.9%), card A (22.4%), card B (18.9%), car loan (7.4%).
- Debt free in: 39 months
- Total interest paid: about $3,974
- Order cleared: store card (month 7), card A (26), card B (35), car loan (39)
Every extra dollar attacks the most expensive balance, so the total cost is mathematically the lowest available at that payment level. Nothing beats it on cost.
The snowball: finished by more people
Order by balance, smallest first: store card ($1,100), card B ($2,700), card A ($4,800), car loan ($9,800).
- Debt free in: 40 months
- Total interest paid: about $4,201
- Order cleared: store card (month 7), card B (19), card A (36), car loan (40)
- Second account gone by: month 19, against month 26 on the avalanche
The snowball costs $227 more and one extra month. In exchange, the account count drops faster — and account count is what people feel. Research out of Northwestern University's Kellogg School found that people who cleared small balances first were more likely to eliminate their whole debt load, because visible progress predicted persistence better than interest saved did.
Side by side
| Avalanche | Snowball | |
|---|---|---|
| Order | Highest APR first | Smallest balance first |
| Time to debt free | 39 months | 40 months |
| Interest paid | $3,974 | $4,201 |
| Accounts closed by month 20 | 1 | 2 |
| Best when | Rates vary a lot | You have quit before |
The hybrid most people should actually run
Clear one small balance for the win, then switch to strict avalanche. You get the early account closure that keeps you going and almost all of the interest saving, because the small balance clears quickly enough that the expensive debt barely notices the delay.
- List every debt with balance, APR and minimum.
- Pay every minimum, always — a missed payment costs more than any optimisation saves.
- Kill the smallest balance first, whatever its rate.
- From then on, target strictly by APR, highest first.
- Roll every cleared payment into the next target. Do not let it leak back into spending.
Two things to do before either method
Bank one month of essentials first. Without it, the next unexpected bill lands on the card you just paid down and the plan resets. Our emergency fund guide covers the target and the account to use.
Find the surplus before you optimise the order. Going from $160 to $300 a month cuts this debt load by roughly ten months — far more than any ordering choice. The fastest source is usually recurring bills: 14 bills you can cut this weekend typically frees $80–$210 a month, and a 50/30/20 review usually finds the rest.
What about a balance transfer or consolidation?
A 0% balance-transfer card can beat both methods — if you clear the balance within the promotional window and you do not start using the emptied card again. Check the transfer fee (typically 3–5%), divide the balance by the number of promotional months, and only take it if that monthly figure is one you can genuinely pay. A consolidation loan is worth it only when the new APR, including fees, is below the weighted average of what it replaces.
Frequently asked questions
Is the debt snowball or avalanche better?
The avalanche always costs less because it targets the highest interest rate first. The snowball clears more accounts early, and studies of real repayment behaviour find people are more likely to finish with it. On the $18,400 debt load in this guide the difference is $227.
How much more does the snowball method cost?
In our worked example with $650 a month against $18,400 of mixed debt, the snowball cost $227 more in interest and took one extra month (40 against 39). The gap widens when one debt has a much higher rate than the others.
Should I pay minimums on everything while using these methods?
Yes. Both methods require paying every minimum every month, then sending all spare money at one target debt. A missed minimum brings late fees and a credit-score hit that outweigh any interest optimisation.
Should I save or pay off debt first?
Save one month of essential expenses first, then attack debt above roughly 15% APR, then finish the emergency fund. Without that buffer, the next surprise expense goes straight back onto the card.
Does a balance transfer beat the snowball or avalanche?
It can, if you clear the balance inside the 0% window and do not spend on the emptied card. Include the 3–5% transfer fee in the maths and divide the balance by the promotional months to check the payment is realistic.
This guide is general information, not personal financial advice. Figures are illustrative and were last verified in September 2026. Rates and thresholds change — check current figures with the provider before acting. See our full disclaimer.