Debt Avalanche Method: Worked Example and How to Stick With It

The debt avalanche method pays off debt in order of interest rate, highest first. You pay the minimum on every debt, send all your extra money to the one with the highest APR, and when it is gone, roll its payment to the next-highest rate. Because the most expensive balance shrinks first, the avalanche usually costs less interest than any other order.

On the four example debts below, it saves $327 compared with the smallest-balance-first snowball and finishes in the same 28 months. The catch is patience at the start. Here is how the numbers work, where the savings come from and how to stay with it.

Avalanche method steps

1. List every debt with its balance, APR and minimum payment from the latest statement.
2. Sort by APR, highest first. The size of the balance does not affect the order.
3. Fix one total monthly payment: all the minimums plus the extra you can pay every month.
4. Pay every minimum, then send everything left to the highest-rate debt.
5. Roll the payment when the target is paid off. Its full payment moves to the next-highest rate in the same month.
6. Re-rank if a rate changes, for example when a variable rate moves.
7. Repeat until every debt is gone.

Debt avalanche example: four debts ordered by APR

These are the same four debts used in our debt snowball method guide and in the calculator on the debt snowball spreadsheet page, so you can compare the two plans line by line.

Avalanche order	Debt	Balance	APR	Minimum	Paid off
1st	Credit card	$4,800	24.9%	$120	Month 18
2nd	Personal loan	$2,400	13.5%	$85	Month 21
3rd	Car loan	$7,500	7.9%	$190	Month 28
4th	Medical bill	$600	0%	$50	Month 12

The assumptions: fixed rates, interest charged monthly as balance × APR ÷ 12, no new charges, and a fixed $645 a month, which is $445 of minimums plus $200 extra. Total interest comes to $2,322, and the last debt is gone in month 28.

The medical bill is last in line but paid off first. At 0% interest, its own $50 minimum clears the $600 in exactly 12 months without any extra money.

How the payment rolls

Months	Credit card	Personal loan	Car loan	Medical bill
1 to 12	$320	$85	$190	$50
13 to 17	$370	$85	$190	done
18	$103, paid off	$352	$190	done
19 to 20	done	$455	$190	done
21	done	$91, paid off	$554	done
22 to 27	done	done	$645	done
28	done	done	$207, paid off	done

In month 1 the card charges $100 of interest, so $220 of its $320 payment reduces the balance. Under the snowball, the same card gets only its $120 minimum in month 1, and just $20 of that reaches the balance. That $200 difference, repeated month after month on the most expensive debt, is where the savings start.

Where the interest savings come from

Here is the interest each debt costs under both methods, with the same $645 a month:

Debt	Interest, avalanche	Interest, snowball	Avalanche difference
Credit card	$993	$1,536	$543 less
Personal loan	$398	$167	$231 more
Car loan	$931	$946	$15 less
Medical bill	$0	$0	none
Total	$2,322	$2,649	$327 less

The avalanche does not save on every debt. The personal loan waits longer for its turn and costs $231 more. But the card saves $543, because every dollar paid there stops a 24.9% charge, and that outweighs everything else.

A quick way to see why: each $1,000 you pay off stops this much interest every month after that.

• Credit card at 24.9%: about $21 a month
• Personal loan at 13.5%: about $11 a month
• Car loan at 7.9%: about $7 a month
• Medical bill at 0%: nothing

The next extra dollar always does the most work on the highest rate. That is the whole logic of the method.

Why the debt avalanche method is hard to stick with

The math is on its side, but the first year can feel slow:

• Your extra payment does not finish a debt until month 18. The medical bill is gone in month 12, but its own minimum did that.
• The target is large. In this example, the highest rate sits on the second-biggest balance, so it takes 18 months of $320 to $370 payments to clear.
• Interest takes a big bite early. In month 1, $100 of the card’s $320 payment goes to interest.
• All four due dates stay open for a full year, while the snowball is down to two debts by month 10.

If you have quit a payoff plan before, this is the stretch where it usually happens. It helps to decide in advance what you will measure instead of “debts paid off.”

How to stay motivated on the avalanche

Track total debt, not debts closed. On this measure the avalanche is ahead of the snowball every month from month 2 until the end. After 12 months you owe $9,241 of the original $15,300, about 40% paid down, compared with $9,408 on the snowball.

Set milestones on the target. Mark every $1,000 off the credit card. In this example it drops below $4,000 in month 4, below $3,000 in month 8, below $2,000 in month 12 and below $1,000 in month 15. That is a new milestone every three or four months.

Count the interest you are not paying. By month 12, the avalanche has charged $167 less interest than the snowball would have, and $279 less by month 18. The monthly interest charge falls too, from $176 in month 1 to $102 in month 12.

Check in once a month, not every day. A monthly update with fresh balances shows real movement; daily checks mostly show interest posting. Our monthly budget review checklist is a natural place to add it.

Allow one quick win if you need it. Paying the small medical bill first, then switching to the highest rate, costs $82 more than the pure avalanche here, and the card is still gone in month 18. Our debt snowball vs avalanche guide compares this hybrid in full.

Protect the target from new charges. A surprise expense on the card you are attacking cancels your highest-value payments. Stop using it for new purchases, and if you still use a card every day, see how to budget with credit cards to keep new spending paid in full.

Pay highest interest debt first: the edge cases

A few situations need a judgment call:

• Rates that change. Variable rates and promotional rates can move. Re-rank at your monthly update using the current APR on each statement.
• Rates that are nearly equal. When two rates are within a point or two, the order between them makes little difference to total interest, so many people put the smaller balance first for the earlier win.
• Debts where the minimum does not cover the interest. The balance grows even while you pay. Raise that payment, and consider talking to the lender or a nonprofit credit counselor about options before building a plan around it.
• Debts in collections or with legal action. These follow different rules. A qualified professional can explain what applies to you.

Your next step: list your debts in APR order, write the month you expect each one to be gone, and put the first card milestone on your calendar. It is much closer than the final payoff date.