Pay Off Mortgage Or Invest
Mortgage prepayment is a guaranteed return equal to the loan rate (simplified), while investing is uncertain. This page frames the invest vs debt mode around mortgage language: same engine, different mental model for homeowners.
Quick answer
Model your mortgage APR, remaining term, and expected net invest return. If your mortgage rate is low and you invest long-term in diversified assets, investing may win on expectation — but prepayment wins on sleep and simplicity.
For a related estimate, see 401k Vs Roth Ira.
Explore further: Compare Investing Strategies · Compare Investment Strategies
How to use this calculator
- Pick the mode that matches the decision: Invest vs debt is not the same question as real estate vs stocks — do not mix modes.
- Align assumptions once: Return, tax drag, and horizon must be shared across strategies or the score is misleading.
- Read break-evens: If the winner flips when return moves a fraction of a percent, the decision is fragile.
What is compared
Extra principal payments versus investing the same cash flow at modeled net returns.
Explore further: Invest Or Pay Off Debt · Invest Vs Debt
Example: 6.5% mortgage vs 6.5% net invest
When rates match, the tie-breaker is risk, liquidity, and itemization — not a spreadsheet tie (illustrative).
Real-world example
- Taxes matter: Mortgage interest deductibility and investment tax drag change after-tax outcomes — reflect tax drag in assumptions.
Explore further: Invest Vs High Yield Savings · Lump Sum Vs Dollar Cost Averaging
Which is better?
Often invest on expectation if you have liquidity; prepay if you value certainty or dislike debt.
FAQ
Why does the recommendation change when I tweak one input?
Because the model is sensitivity-based. Small changes near break-even points change the winner.
Is the “winner” personalized advice?
No — it is a modeled comparison from your inputs. Use it to structure questions for a professional.
Should I ignore liquidity?
No. Even when investing wins on paper, you may need cash buffers — the model does not replace an emergency fund.