Same payments, different order, and one of them is cheaper.
By David Liu, founder of DIY9lives. Last updated November 2, 2026.
Both methods tell you to pay the minimum on everything and throw every spare dollar at one debt. They differ only in which debt goes first. Avalanche sends the extra money to the highest interest rate. Snowball sends it to the smallest balance. The debt payoff planner runs either order against your real balances, and this guide explains what each one is buying.
With three debts and $300 a month spare, the order changes nothing about the total you must pay each month. It changes how long each debt lives and how much interest accrues while it does.
Avalanche orders by rate, highest first, because every dollar paid against a 24% balance saves 24% a year and every dollar paid against a 6% balance saves 6%. It is arithmetic, and it is always cheaper in total interest.
Snowball orders by balance, smallest first, because a debt that disappears is a debt you stop paying interest on entirely — and, more importantly, one you stop looking at. The freed-up minimum payment then rolls onto the next debt, so the payment snowballs even though the rate ordering is worse.
Two debts, $1,000 at 6% with a $25 minimum, and $6,000 at 24% with a $150 minimum. There is $200 a month extra.
| Avalanche | Snowball | |
|---|---|---|
| First target | $6,000 at 24% | $1,000 at 6% |
| Monthly towards it | $350 | $225 |
| First debt cleared | around 20 months | about 5 months |
| Interest on the other debt meanwhile | 6% on $1,000 | 24% on $6,000 |
Snowball closes an account in under half a year, which is a real thing to feel. Avalanche spends twenty months paying 24% before it touches the cheap debt, and it saves more money over the whole plan because the expensive balance is shrinking from the start.
In this example the gap is large, because the rate difference is four to one and the expensive balance is the bigger one. In a typical set of card and loan balances — where rates cluster between 18% and 27% and balances are within a few thousand of each other — the difference in total interest is usually modest, and the difference in motivation is not.
Avalanche wins on interest, always, and the size of the win depends on two things: how wide the rate spread is, and how long the payoff takes. A short payoff makes the ordering nearly irrelevant because there is little time for interest to accumulate. A long payoff with a wide spread makes the ordering the most important decision in the plan.
Snowball wins on the thing arithmetic cannot measure. Most payoff plans fail for behavioural reasons rather than mathematical ones, and the method that keeps someone paying is the method that works. A person who abandons an avalanche plan in month four has saved nothing at all.
The defensible compromise is to sort by rate but treat the first target as a short sprint: if the smallest balance can be cleared in a couple of months, clear it, then switch to avalanche ordering for the rest. That buys the early win without spending years paying the highest rate last.
Neither method works if the minimum payments consume the income. If they do, the problem is cash flow rather than ordering, and the options are different: a hardship arrangement with the lender, a balance transfer, or advice from a non-profit credit counsellor. The Consumer Financial Protection Bureau's debt material is a reasonable place to start reading.
Fees are not in the rate. A card with a 21% rate and a $95 annual fee can cost more than a 23% card without one, depending on the balance. Include fees when you compare, and remember that a balance transfer fee is charged up front on the amount moved.
The plan assumes the balances only fall. A card that is paid off and then used again at the same rate is a loop, not a payoff. In practice, the highest-rate card is often the one most likely to be used, which is an argument for removing it from the wallet rather than just from the spreadsheet.
Before optimising the order, close the leaks. A single card at 24% with a $5,000 balance costs about $100 a month in interest, which is more than any ordering choice will save. Attacking the rate directly — a balance transfer, a lower-rate personal loan, or a call to the issuer — usually moves the total more than the sequence does.
Then build a small buffer before the sprint. A $1,000 emergency fund stops a car repair from going onto the card you just cleared, and that single habit protects the entire plan.
If you are confident you will stay the course and your highest rate is materially higher than the rest, avalanche. If you have started and stopped before, snowball. If a small balance can go in a month or two, clear it first and then run avalanche.
Whichever you choose, write down the order, set the automatic payments, and check the plan at the point where the first balance disappears. That is the moment the plan either becomes real or quietly stops.
A plan with no extra payment is not a plan, it is a schedule. The $200 or $300 that drives either method has to come from somewhere, and finding it is usually easier than people expect once the spending is visible for a month.
Three sources tend to produce the most for the least pain. The first is a recurring subscription you forgot about, which is small per month and permanent. The second is a bill you can re-shop — insurance, phone, internet — where a single call often moves the annual cost by more than a month of the extra payment. The third is the payment you free up when a debt closes, which is the mechanism both methods rely on and which is easy to spend by accident if it does not get redirected the day it appears.
Automate the transfer for the day after payday. A payment that requires a decision each month is a payment that stops in the month you are busiest, and the plan quietly reverts to minimums. The planner can show what the schedule looks like with and without the extra, which is usually the most motivating number on the page.
The final step in either method is the one most plans skip: what happens to the account that has just been paid off. Keeping it open with a zero balance can help credit utilisation, which is a large part of a credit score. Closing it can help some people avoid the loop that put them there in the first place. The right answer depends on which risk is larger for you.
If the balance was run up by habit rather than by an emergency, remove the card from the wallet and from any saved checkout. If it was a one-off, keep it open, set a small recurring bill against it and pay in full each month, which keeps the account active without inviting debt.
Then redirect the payment. The amount that was going to the cleared card is the money that accelerates the next one, and it is also the money that funds an emergency buffer once the plan is done. A debt plan that ends in a zero balance and no savings is a plan waiting to be repeated.
Last updated: November 2, 2026. Estimates only. Not tax, legal, financial, or professional advice. See the terms.