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Lump sum: pay down the mortgage, or invest?
You've received a windfall — a bonus, inheritance or sale proceeds. Should it go toward your mortgage or into an interest-bearing investment? Compare both paths fairly, including taxes and what happens after the loan is paid off.
Net position over time
Net position = investment balance minus remaining mortgage debt, in each scenario. Both scenarios reinvest the freed-up monthly payment once the mortgage is paid off.
The right answer also depends on your tax situation, emergency fund, retirement accounts and risk tolerance — things a calculator can't see.
Get a free professional reviewDisclaimer: This calculator provides a simplified educational estimate based only on the numbers you enter. It assumes a fixed investment return and tax rate, ignores mortgage interest deductions, PMI, inflation, transaction costs and market volatility, and treats expected returns as certain when they are not. It is not financial, tax or investment advice, and no decision should be based on it alone. Please consult a qualified professional before acting on a windfall.