· 7 min read · Updated on
Pay off your mortgage early or invest the money?
Paying down a mortgage early guarantees a return equal to your mortgage rate; investing offers a higher expected return with no such guarantee. The right choice depends on the gap between the two, your risk tolerance, and whether you've already covered the basics — an emergency fund and any higher-rate debt.
1. Extra mortgage payments are a guaranteed, risk-free return
Every extra payment toward principal saves you interest at exactly your mortgage rate, with no market risk attached. On a mortgage at 4%, an early repayment is equivalent to a risk-free investment yielding 4% after tax, which is a high bar for a low-risk asset to beat.
2. Investing offers a higher expected return, not a guaranteed one
Diversified equity portfolios have historically returned more than typical mortgage rates over long periods, but the path is uneven: a stretch of negative years while still paying the mortgage is a real possibility, not a tail risk.
- Higher expected long-run return than a low mortgage rate
- No guarantee in any given year, or even any given decade
- Liquidity: invested money can be accessed if plans change
3. The basics come first, before either option
Before extra mortgage payments or investing, resolve any higher-rate debt (credit cards, personal loans) and build a starter emergency fund. Paying down a card at 20% beats both a 4% mortgage prepayment and an expected 7% investment return, hands down.
4. A simple decision rule
As a rule of thumb, if your mortgage rate is high relative to a safe expected return, prepaying tends to be the more attractive guaranteed option; if your mortgage rate is low, investing has the edge on average, especially inside tax-advantaged retirement accounts.
| Mortgage rate | Typical lean |
|---|---|
| Above 6% | Prepayment often wins on a risk-adjusted basis |
| 4%–6% | Close call; depends on risk tolerance and horizon |
| Below 4% | Investing usually has the higher expected outcome |
5. A middle path: split it
You don't have to choose all-or-nothing. Many households split any surplus between extra mortgage payments and investing, which reduces regret risk either way and still moves both goals forward.
¿Amortizar o invertir? Comparador
Compara el ahorro cierto de amortizar con la rentabilidad neta esperada de invertir el mismo importe.
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Frequently asked questions
- Is prepaying a mortgage ever a bad idea?
- It can be, if it leaves you without an emergency fund, if you still carry higher-rate debt, or if your mortgage rate is well below a realistic long-run investment return and you have a long time horizon.
- Does a fixed or variable mortgage rate change the answer?
- A fixed rate makes the comparison stable over time; a variable rate can move the answer as rates change, so it's worth rechecking the comparison whenever your rate resets.
- What about the tax treatment of investment gains?
- Tax treatment varies a lot by country and account type, and it can meaningfully change the comparison — always compare after-tax numbers, not headline rates.