Debt Snowball vs Avalanche: A Worked Example With Real Numbers

By Tuan · Published 22 October 2026

If you have several debts and some money each month to put towards them, there are two popular ways to decide which one to attack first. The snowball method pays off the smallest balance first. The avalanche method pays off the highest interest rate first. Both work. They just reward you in different ways.

This article explains each one, then runs both on the same three debts so you can see the actual difference in months and interest.

The rules both methods share

1. Pay the minimum on every debt, every month. Missing minimums usually means fees and damage to your credit record, whichever method you use.
2. Decide on a fixed monthly debt budget that's higher than the total of your minimums. The difference is your "extra" payment.
3. Put all the extra on one target debt until it's paid off.
4. When a debt is cleared, roll its payment into the next target. Your monthly total stays the same, but more of it goes to the next debt. This roll-over is what makes both methods speed up over time.

The only difference between the two methods is the order of targets.

Snowball: smallest balance first

Order your debts from smallest balance to largest, ignoring interest rates. You clear the first debt quickly, which gives you a visible win and one less bill to think about. People who have struggled to stick to a plan often find that early progress is what keeps them going.

Avalanche: highest interest rate first

Order your debts from highest interest rate to lowest. Every extra payment goes to the debt that's costing you the most, so you pay less interest overall. The trade-off is that if your highest-rate debt is also a large one, your first payoff can take a while.

A worked example

Here are three debts, with a total monthly budget of 500 for debt repayments. The amounts work in any currency.

The minimums add up to 325, so there's 175 extra each month.

To keep the maths transparent, interest is calculated monthly as balance × APR ÷ 12. For the credit card in month one, that's 4,000 × 24.9% ÷ 12 = 83.00 of interest. The 120 minimum covers that and only reduces the balance by 37. That's a good illustration of why minimum payments alone take so long on high-rate cards.

Snowball order: personal loan (smallest), then credit card, then car loan.

Avalanche order: credit card (24.9%), then personal loan (12.0%), then car loan (6.9%).

Running both month by month gives:

In this example, both methods clear everything in 29 months. The avalanche saves 219.82 in interest (1,971.89 − 1,752.07), because the 24.9% card shrinks faster. The snowball gives you your first win in month 8 instead of waiting until month 17.

Your own results will differ. The gap between the methods depends on how far apart your interest rates are and how big your extra payment is. When your rates are similar, or your smallest debt also has the highest rate, the two methods give almost the same result.

So which should you choose?

• Choose the avalanche if you're confident you'll stick with the plan and want to pay the least interest.
• Choose the snowball if you need early motivation, or if clearing a small debt frees up a minimum payment that makes your monthly budget less tight.
• A hybrid is fine too. Some people clear one tiny debt first for the quick win, then switch to avalanche order. Others prioritise a debt with a promotional rate that's about to end.

The method matters less than the habits: a fixed monthly amount, roll-over when a debt is cleared, and no new borrowing on the cards you're paying off.

Things that can change the picture

• Promotional 0% periods. A debt at 0% now may jump to a high rate later, so note the end date.
• Daily interest and fees. Many lenders calculate interest daily or add fees, so real figures will differ slightly from a monthly estimate.
• Minimums that don't cover interest. If a minimum payment is less than that month's interest, the balance grows even when you pay on time. Check this for every debt.
• Emergencies. Many people keep a small emergency fund while paying off debt, so one unexpected bill doesn't end up back on a card.
• Specialist help. If your minimums are more than you can afford, free debt advice services exist in the US, UK and Australia. Talking to one before you miss payments is usually better than after.

How to set this up yourself

1. List every debt with balance, APR and minimum payment from your latest statements.
2. Add up the minimums and decide your monthly total.
3. Choose your order (snowball, avalanche or your own).
4. Each month, pay all the minimums and put the extra on the first target. Update the balances from your statements.
5. When a target hits zero, move its full payment onto the next one.

A simple spreadsheet can do the month-by-month maths. If you'd like one ready-made, my Debt Snowball & Avalanche Planner Kit compares snowball, avalanche and your own custom order side by side, with the debt-free date and total interest for each. It handles up to 10 debts, warns you if a minimum doesn't cover the interest, and includes a printable tracker. Couples paying off debt together might prefer the Couples Money Bundle, which adds a shared expense splitter.

Disclosure: the planner kit and bundle are my own products on Payhip. The kit is pay what you want ($1 minimum) and the bundle is $1.50. The example figures above are calculated with monthly interest (balance × APR ÷ 12). This is general information, not financial advice.