Avalanche vs. snowball — two ways to pay it down

The situation

You’ve got more than one debt — a card, a car loan, maybe a store card from a furniture splurge. You’ve freed up an extra $200 a month and you’re ready to attack. But which one do you hit first? Spread the $200 across all of them and nothing moves fast. Pick one and go hard — but pick which? This is the most-argued question in personal finance, and the good news is there are only two sensible answers, and the calculator below shows you exactly what each one costs.

The idea

Whenever you have several debts, you pay the minimum on all of them and throw every extra dollar at one target debt. When that one’s gone, you roll its whole payment onto the next. The only question is which debt is the target — and there are two schools:

Avalanche — highest interest rate first. Order your debts by APR, attack the most expensive one, ignore the balances. Because you’re killing the priciest interest first, this method pays the least total interest and is the math-optimal choice. The downside: if your highest-rate debt also has a big balance, it can take a while to clear the first one, and slow progress can sap motivation.

Snowball — smallest balance first. Order your debts by balance, attack the smallest one, ignore the rates. You clear an entire debt fast, get a real win, and roll its payment into the next — building momentum like a snowball rolling downhill. The downside: you might leave a high-rate debt sitting longer, so you pay a little more interest overall.

The rule of thumb: avalanche saves the most money; snowball gives the fastest first win — and the best method is the one you’ll actually finish. This is genuinely both-sides. The personal-finance internet loves to declare one “correct,” but the math difference is often small, and the psychological boost of snowball is real. If clearing that first debt is what keeps you going, that momentum can be worth more than a few dollars of interest. No shame either way.

There’s a nice symmetry here: this is the same “snowball” word from Phase 6, but flipped. There, compounding snowballed your savings up. Here, you snowball your payments — each cleared debt’s payment rolls into the next, so your firepower grows as you go, whichever order you choose.

By the numbers

The calculator below runs three sample debts side by side, both methods at once, with an extra $200/month thrown on top of the minimums:

The debts: a store card ($1,200 @ 20%), a credit card ($5,000 @ 25.99%), and an auto loan ($9,000 @ 6%).

Method	Attacks first	Total interest	Months to debt-free
Avalanche (highest APR first)	The 25.99% credit card	$2,209.33	29
Snowball (smallest balance first)	The $1,200 store card	$2,308.90	29

Look at what diverges and what doesn’t. Both methods finish in 29 months here — but avalanche pays $2,209.33 in interest versus snowball’s $2,308.90. Avalanche saves $99.57 by killing the 25.99% card first. Snowball, meanwhile, clears the $1,200 store card first — a whole debt gone in the first few months, a real psychological win.

So which wins? On pure dollars, avalanche, by $99.57. On momentum, snowball, by clearing a debt sooner. That’s a small price for motivation if motivation is what you need. Try both in the calculator — change the extra payment, reorder the debts — and notice how close the totals stay. The lesson isn’t “avalanche is correct.” It’s that attacking one debt at a time with every spare dollar beats spreading it thin, and that the order is yours to choose based on what keeps you going.

Same budget, two orders — and one shared move that both of them depend on:

flowchart TD
  accTitle: Avalanche and snowball — two orders for the same monthly budget
  accDescr: Start from the same monthly budget: pay the minimum on every debt and put every extra dollar on one target debt. Avalanche attacks the highest interest rate first and pays the least total interest. Snowball attacks the smallest balance first and clears a whole debt sooner, which keeps you going. Both methods then do the same thing: roll each cleared debt's payment into the next debt. The best method is the one you will actually finish.
  B["Same monthly budget: minimums on everything, every extra dollar on ONE debt"] --> A["Avalanche: attack the highest interest rate first"]
  B --> S["Snowball: attack the smallest balance first"]
  A --> AR["Pays the least total interest"]
  S --> SR["Clears a whole debt sooner — a real win that keeps you going"]
  AR --> R["Both: roll each cleared debt's payment into the next debt"]
  SR --> R
  R --> F["The best method is the one you'll actually finish"]

Where this fits

You now have two real strategies — and permission to pick the one you’ll stick with. But both start the same way: by getting every debt into one view so you can see the targets and the order. That single picture is the next lesson — and it’s where this whole “get out of debt” plan comes together.