Debt Payoff vs. Investing Calculator

Yes, in the only sense that matters for planning: every dollar of debt you retire stops accruing interest at that debt's APR, permanently and with zero volatility. Paying down a 22% credit card is economically comparable to avoiding a 22% borrowing cost on that dollar — a trade no investment can match without risk.

A common planning anchor is roughly 10% nominal per year for a diversified US stock portfolio — its long-run historical average — or about 7% after inflation. Anything above 10% should be treated as optimistic. This calculator lets you set your own assumption and shows you the breakeven return, so you can judge whether your assumption needs to be heroic for investing to win.

An employer match is usually a 50% or 100% instant return, which usually beats debt payoff on the numbers alone — though vesting schedules, match rules, taxes, and very high-interest debt can change the picture for any individual. This calculator doesn't model matches — as a rule of thumb, contribute enough to capture the full match first, then use this tool to decide what to do with the next dollar.

The calculator simulates both paths month by month across a range of investment returns and finds the exact return where investing the extra money produces the same net worth as using it to pay down debt. It lands near your debts' weighted-average APR, because paying debt down is economically the same as earning that APR risk-free — though taxes, fees, and minimum-payment effects can shift the exact number.

No — and that's the point of the framing. The debt-payoff path is modeled as certain; the investing path uses a single smooth assumed return with no down years. In reality, investments are volatile, which makes the certain return of debt payoff more attractive than a naive comparison suggests.

When the debt is cheap — a 3–6% mortgage or student loan — and the investment horizon is long, markets have historically cleared that hurdle. A 20% borrowing cost creates an unusually high hurdle for an investment alternative.