Should you pay off a 3% loan or invest?
Paying off a 3% loan earns you a guaranteed 3% return — no market, no risk. Investing offers a higher expected return (~7% in stocks) but with real risk. So the decision comes down to one comparison: 3% certain vs ~7% risky.
The rule of thumb, and where it breaks
A useful default: pay off any loan above about 6–7% before investing in a taxable brokerage, because few investments reliably beat that after tax and risk. Below that, investing tends to win on average. But the rule bends:
- Guaranteed beats risky. The loan payoff has zero volatility. Getting the same expected return in the market requires taking real risk — a bad decade can wipe out the paper advantage.
- Taxes and match come first. A 401(k) match (~100% instant) and tax-advantaged space usually beat both paying off a moderate loan and taxable investing.
- Behavior and cash flow. Clearing a loan frees up monthly cash and removes a psychological weight — worth a lot even when investing edges ahead on a spreadsheet.
This compares a guaranteed loan rate to a risky ~7% expected return; it isn't tax advice. High-interest debt (credit cards, many personal loans) should almost always be cleared before investing. Model your full picture in the calculator.
When the loan costs less than you expect to earn
A loan at a rate this low sits at the friendly end of this decision. Paying it off early locks in a guaranteed return equal to the rate, but that guaranteed return is small, and a diversified portfolio held for many years has historically earned more, especially inside a tax-advantaged account where growth compounds untaxed. On paper, investing usually comes out ahead here.
Two honesty checks keep the comparison fair. First, weigh it after tax: if the loan interest is not deductible, its rate is already an after-tax cost, so paying it off delivers a clean after-tax return that a taxable investment has to beat only after its own taxes are paid. Second, this edge for investing holds only once the higher-priority moves are done, meaning a full employer match, no lingering credit-card balances, and an emergency fund in place.
Even then, math favoring investing is not the same as a rule that you must invest. A guaranteed return is certain; a market return is not. If carrying any debt costs you sleep, retiring a cheap loan early is defensible, because you are simply buying certainty at a modest price.
Common questions
Should I pay off a 3% loan or invest?
At 3%, investing usually wins on average because a diversified ~7% expected return exceeds the 3% guaranteed by paying off the loan — but the payoff is risk-free, so it's a close, defensible call either way.
What loan interest rate is worth paying off before investing?
A common threshold is about 6–7%. Above it, paying off the loan is a hard-to-beat guaranteed return; below it, investing tends to build more wealth on average. Always clear high-interest debt (credit cards) first.
Does paying off debt count as a return?
Yes — eliminating a 3% loan is economically identical to earning a guaranteed, tax-free 3% on that money. That's why high-rate debt is one of the best "investments" available.