Get the math-backed answer in 30 seconds. Compare the guaranteed return from paying off debt vs. expected investment returns over your time horizon.
Pay off debt first if your debt interest rate is higher than your expected investment return (after tax). Investing first makes sense if your debt rate is low (under ~5%), you have a long time horizon, and you can capture employer 401(k) match (free money). Most people benefit from doing both — at minimum match, then attack high-interest debt.
Use the avalanche method: pay minimums on everything, then throw all extra cash at the highest-interest debt. Mathematically optimal. The snowball method (smallest balance first) is psychologically easier and works almost as well — pick whichever keeps you motivated. For a full month-by-month payoff plan across all your debts, try our Debt Payoff Calculator.
Under 36% is healthy (most lenders' threshold for mortgages). 36-43% is manageable but tight. Above 43% is a financial red flag. Calculate: total monthly debt payments / gross monthly income × 100. You can also see how your overall balance sheet looks with our Net Worth Calculator.
The pay-off-vs-invest decision is one piece of a broader debt-and-savings plan. These six tools cover the rest of the workflow — from snowball/avalanche payoff math to the budget and emergency-fund math that should sit underneath any decision here.