If you owe money on three or four cards, you've probably been told there's one right way to pay them off.
There are two, they disagree about the order, and the gap between them is usually smaller than the internet makes it sound.
The avalanche method lines your debts up by interest rate and throws every spare dollar at the highest one first.
The snowball method lines them up by balance instead, smallest first, so you can eliminate an entire account fast and feel something happen.
Run the numbers on a typical stack — a $700 store card at 27%, a $3,200 card at 22%, a $6,500 card at 18% — and avalanche might save you a couple hundred dollars in interest over two years.
That's the part the debt-free screaming matches skip.
The mathematical edge of avalanche depends on how spread out your rates are and how big your monthly payment is.
When the spread is wide, avalanche wins clearly.
When it's narrow, the two methods finish within weeks of each other.
Meanwhile, the behavioral edge belongs to snowball, and behavior is where most payoff plans actually die.
A Federal Reserve survey found that roughly six in ten American adults who use credit cards carry a balance at least sometimes.
It's a mood problem, a Tuesday problem, a "the transmission went out" problem.
Here's who benefits from you not knowing this.
Balance transfer offers with 3% upfront fees and 18-month windows, debt consolidation loans that reset your clock, and apps that charge a monthly subscription to sort your accounts.
All of them profit when you keep refinancing instead of finishing.
So pick the method you'll still be using in month seven.
If seeing a zero balance on one card keeps you going, snowball is not the dumb choice.
If you're wired to optimize and you'll stick with a spreadsheet, take the avalanche and the interest savings.
One caveat worth saying plainly: if your total unsecured debt is more than half your annual income, or you're borrowing to cover groceries, the order of your cards isn't the main issue.
A nonprofit credit counselor — the ones at NFCC-member agencies, not the for-profit debt settlement outfits that advertise on talk radio — can look at the whole picture, often for free.
For everyone else, the boring rules still apply.
Pay at least the minimum on everything, every month, on time.
Then point the extra at one target and don't move it.
The debt payoff industry has a financial interest in you believing there's a secret order.
There's a payment you can afford, an account you can close, and a habit you can keep.
Final Thoughts
That's the whole trick, and it's been free the entire time.