Avalanche vs. Snowball.
The Honest Answer.

You have more than one debt, some money left over each month, and a decision to make about where it goes. There are two well-known answers, and the internet will tell you with total confidence that its favorite is correct.

Both work. They optimize for different things, and the right pick depends on something the math can't see.

The two methods

Both start identically: pay the minimum on every debt, every month, without exception. Missing a minimum triggers late fees and credit damage that dwarf any strategy gain. What differs is where the extra money goes.

Avalanche — highest interest rate first

Every spare dollar attacks the debt with the highest APR. When it's gone, that entire payment rolls into the next-highest. Interest is what makes debt grow, so killing the fastest-growing debt first means less total interest and, usually, a shorter payoff.

Snowball — smallest balance first

Every spare dollar attacks the smallest balance, whatever its rate. You eliminate whole debts quickly. Each payoff frees up its minimum payment and gives you a visible, countable win.

What the difference actually costs

A realistic example. Four debts, $500 a month available above minimums:

Debt	Balance	APR
Store card	$800	26.9%
Credit card	$4,200	22.4%
Medical bill	$1,500	0%
Car loan	$8,000	9.5%

Avalanche order: store card → credit card → car loan → medical bill.
Snowball order: store card → medical bill → credit card → car loan.

In a spread like this the avalanche typically saves a few hundred dollars and finishes a month or two sooner. Not nothing — but also not the landslide either camp implies. The snowball's cost here is mostly that it spends early months on a 0% medical bill while 22.4% interest keeps compounding.

Why the snowball keeps winning anyway

Here's the part the math-first crowd skips. Behavioral research on debt repayment has repeatedly found that people using the smallest-balance-first approach are more likely to actually finish. The proposed mechanism is straightforward: closing out a whole debt produces a sense of progress that a slowly shrinking balance does not, and that feeling is what gets someone to make the same decision again next month.

A plan that saves $400 in interest is worth exactly nothing if you abandon it in month four. The best method is the one you'll still be doing in a year.

How to actually choose

If this is you	Use
One debt has a dramatically higher rate than the rest	Avalanche, no debate
All rates are within a few points of each other	Snowball — the cost difference is trivial
You've started a payoff plan before and quit	Snowball. You need the wins.
You're motivated by spreadsheets and totals	Avalanche
You have one tiny debt you could clear this month	Kill it first, then switch to avalanche

That last row is the honest answer for most people: clear one small debt for the momentum, then run the avalanche for the money. Nothing requires you to pick a team.

What matters more than either

Method choice is a rounding error next to these:

• A small buffer first. $500 set aside stops the next flat tire from going back onto a credit card. Without it you'll refill debt as fast as you clear it.
• Call and ask for a lower rate. Credit card issuers reduce APRs for customers who ask and have paid on time. A ten-minute call can beat a year of strategy optimization.
• Stop adding to the pile. Neither method works while balances are still growing.
• Increasing income beats optimizing payoff order. An extra $200 a month changes your timeline more than any sequencing decision will.

The short version

Pay every minimum. Then: if one rate towers over the others, run the avalanche. If your rates are close, or you've quit a payoff plan before, run the snowball. Either way the decision that actually matters is making the payment again next month.