Debt snowball vs. avalanche: the real dollar difference, worked out

Most articles on this question stop at “avalanche saves more, snowball feels better.” That’s true, and it’s also useless when you’re staring at four balances and trying to decide where next month’s extra money should go. What you need to know is how much more avalanche saves for debts like yours, and whether that number is big enough to override how you’re wired.

We built an example and ran it month by month, both ways.

The two methods in one paragraph each

Both methods start the same way: pay the minimum on every debt, every month, then send every extra dollar to one target. When the target is paid off, its payment rolls into the next target. That rollover is what makes both of them work.

Snowball picks targets from smallest balance to largest. The CFPB says you’ll “see progress quickly as you pay off smaller debts,” but warns you “may end up paying more in the long run.”

Avalanche picks targets from highest interest rate to lowest. The CFPB describes the goal as paying off “the highest interest rate debt as quickly as possible, because it’s costing you the most.”

The worked example

This is an illustration, not anyone’s real file. Four debts, $13,000 total:

The budget is $700 a month for debt, which leaves $289 above the minimums.

Assumptions, so you can check us: interest is charged monthly at APR ÷ 12 on the balance carried into the month; each minimum stays at the dollar amount shown until that debt is gone; every freed-up dollar rolls into the current target. Real card statements use a daily rate and minimums that shrink as balances fall, so your exact numbers will differ a little. We ran this in a script twice, with two separately written versions, and they agreed to the penny before rounding.

Snowball order: Store card, Card Y, Card X, personal loan. Avalanche order: Card X (27%), Card Y (22%), Store card (18%), personal loan (11%).

Month each debt hits zero

Interest paid on each debt

Avalanche saved about $167. Both finished in month 22, because the personal loan had the lowest rate and the largest balance, so it was last in line either way.

Look at where the money moved. Snowball paid almost nothing on the store card and Card Y, but let the 27% card sit for 17 months and paid $1,146 on it. Avalanche did the reverse: it let the cheap balances linger and crushed the expensive one by month 12, cutting Card X’s interest roughly in half.

Then there’s timing. Snowball’s first debt was gone in month 3. Avalanche’s first win didn’t come until month 12. That’s nine months of paying without crossing anything off.

The bigger lever is the monthly amount

We reran the same four debts with a $550 monthly budget instead of $700:

Moving from $550 to $700 a month saved about $981 under snowball and about $902 under avalanche, plus eight months. That’s roughly four to six times the gap between the methods. If you’re agonizing over which order to use, finding another $50 or $100 a month will usually do more than the choice itself.

The gap between methods also grows when your extra payment is small and the rate spread between your debts is wide. A 29% card that’s only slightly larger than a 9% debt is where avalanche earns its reputation, because snowball would make the expensive one wait.

When the two methods are the same, or nearly

• Your smallest balance has the highest rate. Both methods pick the same first target. If the order matches all the way down, they’re identical.
• Your rates are within a couple of points. The interest difference shrinks toward a rounding error, so pick snowball for the momentum.
• One debt is on a 0% promotional rate. Avalanche would put it last, but watch the promo end date. If the balance won’t be paid by then, it may need to move up.

A hybrid is fine too. Some people knock out one tiny balance first for the win, then switch to avalanche order for the rest.

What each method does to your credit score

Neither method is a credit strategy, but they don’t affect your score the same way along the way.

FICO’s amounts-owed category, 30% of the score, looks at more than your overall ratio. FICO says “a larger number of accounts with amounts owed can indicate higher risk of over-extension.” Snowball zeroes out accounts faster, so in the early months you’ll have fewer cards reporting a balance. Avalanche brings the biggest card balance down sooner, which can help that card’s individual utilization. FICO doesn’t publish what either change is worth in points, so don’t let a guess about score movement override the interest math.

Two rules apply either way:

• Don’t close cards as you pay them off. A paid-off card with an open limit lowers your overall utilization. Closing it does the opposite.
• Never miss a minimum to fund the target. Payment history is 35% of a FICO Score. One late payment would cost more than any ordering choice saves.

If you’d rather see how quickly a score tends to react once card balances fall, read how fast your score moves after paying off cards. If you’re weighing a personal loan to consolidate instead, using a loan to pay off cards covers the trade-offs.

Setting up your own plan

1. List every debt with its current balance, APR and minimum payment. Your statements show all three.
2. Add up the minimums. Decide what you can pay in total each month, and be realistic; a plan you abandon in month four saves nothing.
3. Sort the list twice: once by balance, once by APR. If the top item is the same, you’re done deciding.
4. If they differ, run both orders through the card payoff calculator with your real numbers and look at the gap in dollars.
5. Choose. If the gap is small or you’ve started and quit plans before, snowball is a reasonable pick. If the gap is large, avalanche is worth the wait for the first win.
6. Set every minimum on autopay so nothing slips, then make the extra payment by hand each month to the target.
7. When a debt hits zero, immediately add its old payment to the next target. Skipping this step is the most common way both methods stall.