Snowball or avalanche: which actually clears debt faster?
Avalanche wins on arithmetic every single time. On the debts loaded into this site's calculator it saves $728 and finishes a month sooner. But that is the smaller of the two decisions in front of you, and the larger one is worth more than five times as much.
The part both methods share
The example throughout is the debt payoff calculator on its defaults: a $6,000 credit card at 22.9%, a $12,000 car loan at 6.5%, and a $2,500 medical bill at 0%. Minimums total $490 a month and there is $250 spare, so the budget is $740.
The rolling payment does the heavy lifting
Both methods work the same way. Pay the minimum on everything, throw every spare dollar at one target debt, and when that debt clears, its minimum does not go back into your budget. It rolls onto the next target. The amount attacking your debt grows each time one falls, which is where the snowball image comes from even though avalanche does it too.
If you take one thing from this page, it is that: keep sending the same total every month even as individual debts disappear. The method you pick decides the order. The rolling payment decides the speed.
The scoreboard
| On the same $20,500 of debt | Avalanche | Snowball |
|---|---|---|
| Targets | highest rate first | smallest balance first |
| Debt-free in | 2 years 7 months | 2 years 8 months |
| Total interest | $2,403 | $3,131 |
| Total paid | $22,903 | $23,631 |
| First debt gone | 18 months | 9 months |
Avalanche is $728 cheaper and one month faster. Snowball gets your first debt off the board in half the time, 9 months against 18, because it goes after the $2,500 medical bill while avalanche is still grinding down the credit card.
That is the entire trade, stated honestly: $728 is the price of getting your first win nine months sooner. Whether that is a bargain or a waste depends on something no spreadsheet knows, which is whether you will still be doing this in month twelve.
How big the gap is depends on one thing
The $728 is not a universal figure. It is a function of how far apart your interest rates are, and it collapses to nothing when they converge. Same debts, same balances, same budget, only the rates changed:
| Your three rates | Avalanche interest | Snowball interest | Avalanche saves |
|---|---|---|---|
| 15% / 15% / 15% | $4,823 | $4,823 | nothing |
| 15% / 14.9% / 14.8% | $4,779 | $4,788 | $9 |
| 13% / 12% / 11% | $3,623 | $3,701 | $77 |
| 22.9% / 6.5% / 0% | $2,403 | $3,131 | $728 |
| 29.99% / 6.5% / 0% | $2,912 | $3,965 | $1,053 |
Look at the top row. When all three rates are identical, the two methods produce exactly the same interest, because the order truly stops mattering. That is the sanity check that tells you the rest of the table is measuring what it claims to.
So the decision rule falls out of the arithmetic. If your rates are close together, pick whichever method you will actually stick to, because the cost of choosing wrong is small. If one debt is far more expensive than the others, use avalanche. At 29.99% the difference is over a thousand dollars and no motivational benefit is worth that.
All figures read from the debt payoff calculator by changing only the interest rates and leaving balances, minimums and the $250 extra untouched. The identical rate row is the check: two different orderings of the same rates must cost the same, and they do, to the dollar. Method on how it's checked.
The decision that dwarfs both of them
$250 a month is worth five times the method
Here is the comparison nobody frames this way. Pay only the minimums on these debts, $490 a month, and you are in debt for 4 years 7 months and pay $6,353 in interest. Add the $250 and it becomes 2 years 7 months and $2,403.
That extra $250 a month saves $3,950 and two full years. Choosing the better of the two methods saves $728. The decision people agonize over is worth about a fifth of the decision they skip.
If you are trying to work out where to find that $250, the budget builder is a better use of an evening than re-reading arguments about payoff order.
And some debts should jump the queue regardless
Neither method knows about your employer's 401(k) match, which is an immediate 50% or 100% return and beats clearing a 22.9% card. Neither knows you have no emergency fund, which is how a car repair turns into a new credit card balance and undoes six months of progress.
Order of operations before either method matters: capture the full match, hold a small emergency buffer, then attack the debt. The guide on paying down a mortgage against investing works through the same logic at a larger scale.
What this model leaves out
Real minimum payments shrink as you pay
The calculator holds each minimum fixed. Credit card minimums are usually a percentage of the balance, so they fall as the balance does, which stretches the payoff longer than any fixed minimum suggests. That makes the minimums-only column optimistic, and it strengthens the argument for the extra $250 rather than weakening it.
It also assumes you add no new debt. One holiday season on a card you are trying to clear resets much of the progress, and no ordering strategy survives that.
Options that sit outside the comparison entirely
A 0% balance transfer can beat both methods outright by removing the interest instead of reordering it, though the transfer fee and the rate after the promotional window need checking. A consolidation loan can do the same. So can calling the issuer and asking for a lower rate, which works more often than people expect.
One quirk of this example worth noticing: the medical bill sits at 0%, so in interest terms it never needs paying early at all. Avalanche puts it last for exactly that reason. Snowball puts it first because it is smallest, which is how a 0% debt ends up costing you money in a strategy designed around momentum.
Common questions
Which method is mathematically better?
Avalanche, always, because paying the highest rate first removes the most expensive debt while it is still large. On the example here it saves $728 in interest and finishes a month sooner. It can never lose on arithmetic. The only question is whether the amount it wins by is large enough to matter to you.
How big is the difference between the two methods?
It depends entirely on how far apart your interest rates are. With rates of 0%, 6.5% and 22.9% the gap is $728. Compress those to 11%, 12% and 13% and it falls to $77. Make them identical and the gap is exactly zero, because the order stops mattering. Push one card to 29.99% and the gap grows to $1,053.
So does the snowball method ever make sense?
Yes, when your rates are close together and you need to see progress to keep going. On this example snowball clears the first debt in 9 months against 18 for avalanche, so you get your first win in half the time for $728. If your rates are within a few points of each other that is a reasonable trade. If one card is at 29% it is not.
What matters more than picking a method?
How much extra you pay. Paying only the minimums on these debts takes 4 years 7 months and costs $6,353 in interest. Adding $250 a month cuts that to 2 years 7 months and $2,403, a saving of $3,950. That is more than five times what choosing the better method is worth, and most people spend their energy on the smaller decision.