Should you pay off a 4% loan or invest?
Paying off a 4% loan earns you a guaranteed 4% 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: 4% 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.
A sure thing measured against a likely one
Paying down a loan and investing are not the same kind of bet, and that contrast is the heart of this decision. Every dollar aimed at the loan earns a guaranteed, risk-free return equal to its rate, with no volatility, no bad decade, and no sequence risk. Investing offers a higher expected return, but expected is an average across many possible futures, some of them disappointing.
At a rate in this neighborhood, that certainty is worth more than it first appears. The closest risk-free alternatives, high-grade bonds and cash, have often yielded less, which makes paying the loan look like buying a safe asset at an attractive, tax-free yield. The stock market's edge is real, but it shows up only on average and only over long horizons.
So the honest framing is not which one earns more, but how much extra expected return justifies taking on risk you could simply erase. A borrower with a short horizon, a shaky income, or low tolerance for a rough market can reasonably prefer the sure thing, even when the odds tilt toward investing.
Common questions
Should I pay off a 4% loan or invest?
At 4%, investing usually wins on average because a diversified ~7% expected return exceeds the 4% 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 4% loan is economically identical to earning a guaranteed, tax-free 4% on that money. That's why high-rate debt is one of the best "investments" available.