Which saves more interest, reducing the payment or reducing the term?

Reducing the term, and by a wide margin. By shortening the life of the loan you eliminate entire payments from the end and stop paying interest for years. Reducing the payment spreads the same capital over the same time, so the savings are considerably smaller.

When is it better to reduce the payment instead of the term?

When your current payment is squeezing your budget, when you have a variable-rate mortgage and want to protect yourself against Euribor rises, or when you prefer to free up monthly cash to invest or build an emergency fund.

Can I freely choose between reducing the payment or the term?

In general, yes: when you order the partial overpayment, the bank asks you which one you want. Some older deeds set a default option; check yours or ask before signing the order.

Is it better to overpay at the start or at the end of the mortgage?

At the start. Under the French amortization system, in the early years you mostly pay interest, so every euro repaid early works for longer. In the final years you are almost only repaying capital and the savings are small.

July 10, 2026

Overpaying your mortgage: when is it better to reduce the payment and when to reduce the term?

Reducing the term saves far more in interest; reducing the payment gives you breathing room each month. With real numbers: which suits your situation and how to calculate it.

You have €20,000 saved up and decide to put it towards your mortgage. Congratulations: it is one of the best financial decisions you can make. But the bank will ask you the question: shall I reduce the payment or reduce the term? And that answer can be worth more than €10,000.

The two options, in one sentence

Reduce the term: you keep paying the same monthly amount, but you finish years earlier.
Reduce the payment: you pay less each month, but you finish on the same day.

The example with numbers

Typical mortgage: €150,000 outstanding, 25 years remaining, 3% interest. Current payment: €711/month. Interest left to pay: around €63,400. You overpay €20,000 and:

	Reduce term	Reduce payment
New payment	€711 (unchanged)	≈ €617 (−€95/month)
Remaining term	≈ 20 years and 5 months (−4.5 years)	25 years (unchanged)
Remaining interest	≈ €43,900	≈ €55,000
Interest saved	≈ €19,500	≈ €8,400

The same overpayment saves more than twice as much if you put it towards the term. It is not magic: by cutting years off the end of the loan, you eliminate the most distant payments in one go — the ones carrying interest accumulated over the longest time.

So, always the term?

Mathematically, reducing the term wins almost every time. But personal finance is not just mathematics:

Reduce the term if…

Your current payment is comfortable and you do not foresee tight spells.
Your goal is to be a debt-free homeowner as soon as possible.
You want to maximize the total interest saved.

Reduce the payment if…

The payment is squeezing you or your income is irregular: freeing up €95/month is insurance against the bad months.
You have a variable-rate mortgage and want to cushion future rises in the Euribor: with a lower payment, each rate review will hurt less.
You prefer to redirect that monthly money to investments, pension plans or rebuilding your emergency fund.

There is a third route that combines the best of both: reduce the payment and keep paying “as if nothing changed”, contributing the difference as a new overpayment each year. You achieve almost the same savings as reducing the term, while keeping the flexibility to step back whenever you want.

Before ordering the overpayment

Review the fees, legal limits and step-by-step process in our guide to early repayment — since Ley 5/2019 the fees are capped and, after the first few years, they are usually zero on variable-rate mortgages. And for your specific case, run the numbers with the mortgage calculator: compare your current scenario with the reduced capital and you will see the exact savings of each option.

Notice: informational content, not financial advice. Every personal and tax situation is different; if in doubt, consult a professional.