Pay Off the Mortgage or Invest?
Extra money each month: to the mortgage, or invested? Every piece below can be linked to, so it opens in a window on your reader's screen, current as of the record. No form to fill in.
2026 law · Reviewed September 7, 2026 · The full page, with methodology and sources · the terms · All tools
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The balance, rate, years left, extra per month, expected return, and whether the interest is deducted in; the months and interest saved, the two paths drawn as lines, and the position each way out. In a frame it carries no cookies, no tracking, and a visible link back to the methodology. Your site has to allow frames; most do. The link that opens it in a small window is on the professionals page.
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- In plain words.
- Paying extra on a mortgage earns the mortgage rate, for sure, and ends the loan early. Investing the same money earns whatever the investment returns, which is not for sure. This tool runs both month by month for the years left on the loan. On the first path the extra goes to the mortgage until it is gone, and then the whole payment is invested. On the second the extra is invested from the start while the mortgage runs to its end. It shows the months and interest saved, and the position each way at the end.
- Why it matters.
- It is one of the most common questions a household with a little room in the budget asks, and the answer is usually argued on feeling. A number for each path lets the feeling, which is about certainty and about being debt-free, be weighed against the size of the gap.
- An example.
- $300,000 at 6% with 25 years left and $500 a month extra, against a 7% return: to the mortgage, the loan ends 8 years and 11 months early and about $112,299 of interest is saved, and the position at the original end date is about $363,745. Invested instead, about $405,036, so investing is ahead by about $41,291 at that return.
- Where it stops.
- The expected return is a guess, and it decides the answer. The tool holds the rate and the return steady, pays no tax on the investment's growth, and deducts the interest only if you say you itemize. It leaves out mortgage insurance, prepayment penalties, the emergency fund you should keep first, and the risk that the investment does something the average does not.
The facts
Six quotable sentences on paying the mortgage against investing.
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- Every extra dollar sent to a mortgage earns exactly the mortgage rate, guaranteed, and the saving is not taxed when the standard deduction is taken. Most households take it: for 2026 it is $32,200 on a joint return and $16,100 for a single filer, and the interest is deducted only above it.
- The same dollar invested earns whatever the market gives, which may be more and may be less, and is not guaranteed in any year. The comparison is a sure return at the mortgage rate against an expected return that carries risk.
- Example: $300,000 at 6% with 25 years left, and $500 a month extra. Sent to the mortgage, the extra clears it 8 years and 11 months early and saves about $112,299 of interest; with the freed payment then invested at 7%, the position at the original end date is about $363,745. Invested from the start at 7% instead, it is about $405,036.
- When the expected return equals the mortgage rate, the two paths end equal to the cent, because a dollar of debt retired and a dollar invested compound at the same rate. The whole answer is the gap between the two rates and how sure you are of it.
- The two paths differ in ways the arithmetic does not price. Money sent to the mortgage cannot be taken back without selling or borrowing; money invested can be sold. And the payoff is certain while the investment is not, which is worth something to most people even when the expected return is higher.
- Deducting the interest lowers the sure return: a 6% mortgage deducted at 24% costs 4.56% after tax. That applies only to a household that itemizes, and only to the interest above the standard deduction.
By the expected return
How the answer moves with the one assumption that decides it.
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| Expected return | Extra to the mortgage, then invested | Extra invested throughout | Which leaves more |
|---|---|---|---|
| 4% | $314,999 | $257,065 | The mortgage, by $57,934 |
| 5% | $330,270 | $297,755 | The mortgage, by $32,516 |
| 6% | $346,497 | $346,497 | They tie |
| 7% | $363,745 | $405,036 | Investing, by $41,291 |
| 8% | $382,085 | $475,513 | Investing, by $93,428 |
Cite and link.
The clean address, a citation generated from the record so it can never carry a stale review date, and an address for every section so you can point a reader at the exact table or method.
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- Link
- https://consideratecapital.com/tools/pay-off-mortgage-or-invest
- Citation
- Considerate Capital, "Pay Off the Mortgage or Invest?," reviewed September 7, 2026, https://consideratecapital.com/tools/pay-off-mortgage-or-invest.
Link to a section
- The calculator https://consideratecapital.com/tools/pay-off-mortgage-or-invest#calculator
- The facts https://consideratecapital.com/tools/pay-off-mortgage-or-invest#facts
- By the expected return https://consideratecapital.com/tools/pay-off-mortgage-or-invest#key-numbers
- How the comparison works https://consideratecapital.com/tools/pay-off-mortgage-or-invest#how-it-works
- Methodology https://consideratecapital.com/tools/pay-off-mortgage-or-invest#methodology
- Revision history https://consideratecapital.com/tools/pay-off-mortgage-or-invest#revision-history
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