Most schools skip this. Here's the stuff that actually determines whether debt shrinks or just moves around - in plain language, with real numbers.
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Every month, interest is calculated on whatever balance is left, then added to what you owe. Pay it down slowly and you're mostly paying interest on interest - not the thing you actually bought.
Here's the gap between the rough guess most people make and what actually happens on a $5,000 balance at 25% APR with a $150/month payment:
That's not a rounding error - it's nearly five years and $3,700 that the simple math completely hides. This is exactly why Behave calculates real payoff dates instead of just dividing balance by payment.
Card issuers calculate minimum payments to be just enough to keep you current - not enough to meaningfully reduce what you owe anytime soon. Paying only the minimum on a typical high-APR card can mean over a decade to pay off a balance you stopped adding to years ago.
A minimum payment is a floor, not a target. It exists so you avoid late fees and credit damage - it was never designed to get you out of debt in a reasonable timeframe. Treating it as "the payment" instead of "the bare minimum" is one of the most common reasons debt sticks around far longer than it needs to.
Both methods do the same basic thing: pay minimums everywhere, throw every spare dollar at one target debt at a time. They just disagree on which debt goes first.
Neither is "wrong." Avalanche wins on a spreadsheet. Snowball wins if the psychological win of crossing something off keeps you going when avalanche wouldn't. Pick the one you'll actually stick with - Behave lets you toggle between them anytime.
Without a cash cushion, an unplanned expense - a car repair, a medical bill, a broken appliance - has nowhere to go but back on a card. That's the trap: you pay down a balance, something breaks, the balance comes right back. Net progress: zero, except now you've also burned the effort of paying it down once already.
A small emergency fund (commonly $1,000 as a starting target) breaks that cycle. It's not about earning a great return on that cash - it's about having a shock absorber so debt payoff can actually be a straight line instead of a loop.
A regular checking or savings account at a traditional bank often pays close to nothing in interest - a fraction of a percent. A high-yield savings account (HYSA), usually offered by an online-only bank, can pay meaningfully more, while remaining just as FDIC-insured (up to the standard federal limit) and just as liquid - your money is still available within a day or two whenever you need it.
For an emergency fund specifically, this is close to a free upgrade: same safety, same access, meaningfully more growth while it sits there waiting to be needed. It won't move the needle on debt payoff by itself, but there's no good reason to let idle emergency-fund cash earn nothing while inflation quietly erodes it.
If your debt minimums add up to more than you can actually cover, that's not a math problem to ignore - it's a signal. There are only two real levers: bring in more money, or spend less of it. Most people jump straight to cutting "wants" (dining out, subscriptions, entertainment), and that's a reasonable first move.
But sometimes wants alone aren't enough, and it's worth being honest about "needs" too - not eliminating them, but finding a cheaper version of the same need. A phone plan with less data. A car insurance policy with a higher deductible. A less expensive car payment on the next vehicle. A smaller apartment. None of these mean going without - they mean the same need, met for less, freeing up real money for the thing that's actually urgent: getting out from under interest that compounds against you every single month.
This page is general financial education, not personalized financial, investment, tax, or legal advice. Interest rates, account terms, and FDIC coverage limits change - verify current details with your bank or a licensed advisor before making decisions based on anything here.