Paying off your mortgage early: lower payment or shorter term?
Overpaying your mortgage means returning part of the principal early. When you do, you usually choose between paying less each month or finishing sooner. It sounds like a small decision, but on a long loan the difference in interest can run into thousands.
- Shortening the term saves more interest; lowering the payment gives more monthly breathing room.
- In the example, a €20,000 overpayment saves about €19,900 by shortening the term vs about €8,450 by lowering the payment.
- Prepayment fees are often capped by law and are usually lower on variable loans.
- Overpaying early has the biggest effect: at the start, most of each payment is interest.
- Before overpaying, keep an emergency fund and compare with what that money could earn invested.
What happens when you overpay
The money you pay is deducted directly from the outstanding principal. Since each month's interest is calculated on that principal, from then on you pay less interest. You then choose what to do with the saving:
- Lower the payment: keep the term and the lender recalculates a smaller payment.
- Shorten the term: keep the payment and finish sooner.
In some countries, such as the US, an extra payment shortens the term by default and lowering the payment requires a "recast".
A calculated example
A €200,000 mortgage at 3% over 30 years (payment of €843.21). After 5 years you owe €177,813 and overpay €20,000:
When to choose each option
Shorten the term if your current payment is comfortable and your goal is to pay less interest and be debt-free sooner — for example, before retiring.
Lower the payment if the payment is tight, if your income may fall (job change, children, approaching retirement) or if you have a variable rate and want to cushion possible rises.
A middle path: lower the payment and keep paying the old amount through regular overpayments. You get almost the saving of a shorter term with the flexibility of a smaller payment if you ever need it.
Prepayment fees
Many countries cap prepayment fees. In Spain, for example, the fee can never exceed the lender's actual financial loss, and it is limited to 0.25% (first 3 years) or 0.15% (first 5 years) on variable loans, and to 2% (first 10 years) and 1.5% afterwards on fixed loans. In the US, most standard mortgages have no prepayment penalty.
Check your loan agreement: it states what applies to you.
Overpay or invest?
Overpaying gives you a guaranteed return equal to your mortgage rate: if you pay 3%, each euro overpaid "earns" 3% risk-free. Investing may earn more over the long term, but with risk and taxes.
As a guide:
- With high rates or a variable loan exposed to rises, overpaying is often very sensible.
- With low, fixed rates, long-term investing can make more sense if you have the horizon and tolerate volatility.
- In both cases, the emergency fund comes first: money used to overpay does not come back.
When overpaying has the biggest effect
With standard amortisation, most of the payment is interest at the start and almost all principal at the end. That is why each euro overpaid in the early years saves far more interest than the same euro near the end. You can see it in the yearly amortisation table of the mortgage calculator.
Frequently asked questions
Is it better to lower the payment or shorten the term?
Shortening the term saves more interest. Lowering the payment gives more liquidity and better protection if your income may fall or your rate is variable.
Are there fees for paying off a mortgage early?
It depends on the country and the contract. Many countries cap them by law, and most standard US mortgages have no prepayment penalty.
When is overpaying most worthwhile?
The earlier, the more interest you save. It makes most sense with high rates or variable loans, as long as you keep an emergency fund.
Should I overpay or invest the money?
Overpaying earns your mortgage rate risk-free. Investing may earn more over the long term, with risk. Many people split the money between both.