Snowball vs avalanche.
If you've read anything about paying off debt, you've probably hit these two terms. They're the two main strategies, both work, and the choice between them is about psychology more than math.
Snowball. Pay the minimum on everything, then put every extra dollar against your smallest debt regardless of interest rate. When it's paid off, roll that payment into the next-smallest. The early wins keep you motivated.
Avalanche. Same minimums, but extra dollars go against your highest-interest debt first. Mathematically optimal — saves you the most money in total interest. The early progress feels slower because the highest-interest debt is often also the largest.
The "best" strategy is the one you actually stick with for 18 months. Avalanche wins on math. Snowball wins on psychology. Pick the one that won't make you quit.
Why most debt payoff plans fail.
The common failure mode isn't picking the wrong strategy. It's setting the monthly payment too high.
People in debt-payoff mode often map out a plan where they put 40% of take-home pay against debt. Two months in, they're miserable, they break, they buy something stupid, and they conclude they're "bad with money." They weren't. The plan was inhumane.
The fix: pick a debt-payoff amount that's sustainable for 24+ months, not aggressive enough to feel like punishment. A moderate plan you finish in 2 years is better than an aggressive plan you abandon after 4 months and have to restart with the credit-card balance now higher.
And: keep some discretionary money. Yes, even now. Especially now. A budget with zero "fun" allowance is a budget designed to fail. Allocate something small but real, and use it.
💡 Pro tip: Ambit's Debt Planner runs both strategies.
The Debt Planner (Pro tier) lets you load all your debts — credit cards, student loans, the car, whatever — with their balances, interest rates, and minimum payments. Then it models out both Snowball and Avalanche side by side: payoff date, total interest, month-by-month progress.
You can also enter an extra monthly amount (the "above the minimums" you can afford) and see how much it changes the timeline. Going from $100 extra to $200 extra often shaves a year or more off the total payoff. That's a number worth seeing.
There's also a Lump Sum analyzer — if you got a tax refund, a bonus, or proceeds from selling something, plug the amount in and see how much it accelerates your plan. Sometimes a single $1,500 lump sum is worth months of extra monthly payments.