Learn → Debt

Should I pay off my mortgage early?

It is a legitimate choice but a preference for certainty, not an obvious win. Overpaying earns you exactly your mortgage rate, guaranteed. Investing might earn more, and might not. Clear expensive debt first and keep a buffer; after that, either answer is defensible and the difference is smaller than the argument suggests.

What an overpayment actually earns

An overpayment removes future interest at your mortgage rate. If the rate is 4%, the overpayment has earned 4% — guaranteed, and in most countries with no tax on it, because avoided interest is not income.

That is a genuinely decent risk-free return, and it should be compared against other risk-free returns, not against the best year a stock market ever had.

The honest comparison

Investing has historically returned more than typical mortgage rates over long periods. But “historically” and “over long periods” are load-bearing. The return is uncertain, arrives unevenly, and may be reduced by tax and costs depending on where you hold it.

Overpaying is certain. Less exciting and worth something real — particularly as the rest of your financial life gets more uncertain rather than less.

The gap between them is usually a few percentage points a year of expected return, with very different levels of confidence attached. That is not nothing over twenty years. It is also not the obvious landslide that either camp presents.

Things that legitimately tilt it

Toward overpaying:

A high mortgage rate. At 6%+ the case strengthens considerably.
Being close to retirement, where lower fixed costs matter more than expected returns.
Knowing you would not actually invest the difference. “Invest the surplus instead” only works if you do, and many people spend it.
Sleeping badly about the debt. That is a real cost, and there is no prize for optimising your way into anxiety.

Toward investing instead:

A low mortgage rate locked in for a long time.
A long horizon — decades, not years.
Not yet having taken an employer retirement contribution, which beats both.
Wanting the money to remain reachable. Overpayments generally cannot be withdrawn; investments generally can.

Before either

Two things come first, and neither is controversial:

Expensive debt. Any card or consumer credit at a high rate outranks both overpaying and investing. It is not close.

A buffer. Overpaying a mortgage converts liquid money into equity you cannot easily reach. Someone with a heavily overpaid mortgage and no cash is one boiler failure from borrowing expensively against a house they have been diligently paying down. Keep the emergency fund intact first.

The middle answer

You do not have to choose. Overpay by a modest fixed amount, invest the rest, and stop treating it as a binary. That splits the difference between certainty and expected return, which is a perfectly rational place to be when the two options are genuinely close.

The part that is not financial

For many people a paid-off home is not really an investment decision. It is about what happens if the job goes, or health changes, or the plan does not hold. A house with no mortgage lowers the income you need to survive, permanently.

That is worth something the spreadsheet does not capture, and it is a legitimate reason to accept a slightly lower expected return. Just be clear that it is what you are buying, rather than believing it is also the mathematically optimal choice. It usually is not, and it can still be the right one.