Invest Extra Money or Repay Debt?
Compare putting surplus cash into investments versus paying down loans. See when guaranteed interest savings beat expected market returns.
Open calculatorInvest the surplus
Build assets while making minimum debt payments. Higher expected return, higher volatility.
- Potential long-term market growth
- Liquidity if invested in accessible accounts
- Can capture employer retirement matches
- No guaranteed return
- Behavioral risk in downturns
- Looks worse if debt APR is very high
Repay debt faster
Use surplus to cut principal. Guaranteed return equal to the interest rate avoided.
- Guaranteed effective return
- Lower stress and faster freedom
- Best for high-APR consumer debt
- Less liquid after cash is applied to the loan
- May underperform markets when rates are very low
- Skipping employer match is usually a mistake
Crush high-interest debt first. For low-rate mortgages, model both paths. Never skip an employer match to overpay a cheap loan.
Key factors
- Loan APR after tax
- Expected after-tax investment return
- Emergency fund size
- Job stability and risk tolerance
How to decide
- 1List every APR
Credit cards, personal loans, mortgage — use real statements.
- 2Set a conservative return
Use a modest expected portfolio return, not last year’s bull market.
- 3Run invest vs repay
Compare wealth over 10–20 years with the Invest vs Repay Calculator.
- 4Pick a hybrid if close
Split surplus when rates are mid-range and you need motivation.
Run the numbers
Free calculators linked to this comparison.
Frequently asked questions
Should I invest while I have credit card debt?+
Almost never. Card APRs usually exceed reliable after-tax expected returns. Pay the card first, then invest.
What about a low-rate mortgage?+
Often invest after capturing any employer match — but run the calculator with your rate and risk tolerance.