Guide
How Much Interest Are You Really Paying on Your Debt?
If someone asked what you owe, you could probably answer in seconds. Ask what that debt is actually costing you — in real interest, over the time it'll take to pay off — and most people have no idea. That number is usually the one that changes how you think about which debt to tackle first.
Why the balance alone is misleading
A $2,000 balance at 6% and a $2,000 balance at 24% look identical on a statement, but they are not the same problem. The higher-rate debt keeps accruing cost every month it survives, quietly undoing whatever progress you're making elsewhere. Balance tells you the size of the debt; interest rate tells you how urgent it is.
The two ways to attack multiple debts
The snowball method pays off the smallest balance first, for the psychological win of clearing a whole debt quickly. The avalanche method pays off the highest interest rate first, for the smallest total interest paid over the life of the payoff. Neither is wrong — snowball tends to keep people motivated longer; avalanche tends to cost less in the end. The only way to know how much less is to actually run the numbers for your specific debts.
What actually changes when you calculate it
Two things usually surprise people the first time they see a real month-by-month schedule: how much of an early payment goes to interest rather than principal, and how much extra even a modest additional payment saves once it's compounding in reverse. A flat $50 or $100 extra a month can cut months, sometimes years, off a payoff timeline — but the exact effect depends entirely on your specific balances and rates, which is why generic advice like "just pay more" is far less useful than seeing your own numbers laid out.
Why a calculator beats doing it by hand
Amortization math compounds every month, which makes it genuinely tedious and error-prone to track on paper for more than a couple of debts. A spreadsheet that recalculates automatically — updating the payoff date and total interest the moment you change a balance or add an extra payment — turns a half-hour of error-prone arithmetic into typing three numbers.
Common mistakes
- Only looking at the minimum payment. Minimums are set to keep you paying as long as possible, not to get you out of debt efficiently.
- Ignoring rate differences between debts. Treating all debt as equally urgent means the most expensive balance often gets paid off last, by accident.
- Never recalculating after a rate change. Variable rates and balance transfers change the math — worth re-running the numbers whenever they do.