IRA: how to calculate early repayment fees before you decide to buy or rent

Why early repayment fees matter in every buy or rent decision

When you compare whether it is better to buy or rent, you usually look at the mortgage rate, rent level, or notary fees. One key parameter is often ignored: early repayment fees, called indemnités de remboursement anticipé (IRA) in France. If you sell before the end of the mortgage (job move, separation, change of city), these penalties can reach several thousand euros and completely change your buy or rent calculation.

In France, early repayment penalties are regulated. For a standard home loan, they are capped at 3% of the outstanding principal or 6 months of interest on the repaid capital, with the bank allowed to charge the lower of the two. Understanding how this works, and how to plug it into a buy or rent simulator via the penalite_remboursement parameter, is essential if you want a data-driven comparison.

Quick reminder: how a classic French mortgage works

To understand early repayment fees, you first need the basics of an amortising mortgage:

• You borrow a principal amount (e.g. €250,000) over a given term (e.g. 25 years).
• You pay a fixed monthly instalment which includes interest + principal.
• At the beginning, the interest portion is very high; it gradually decreases over time.
• The nominal mortgage rate (currently around 3.6% in early 2026) is combined with borrower insurance (typically 0.25–0.45%).

If you keep the property until the loan maturity, there is no IRA. But if you sell after 6, 10, or 15 years, you repay the outstanding principal early, and the bank may charge early repayment fees. These penalties become a real cost of the “buy” option in any buy or rent comparison.

Legal framework: the cap on early repayment fees

For French residential mortgages at fixed rate, the law caps early repayment penalties as follows:

• 3% of the outstanding principal at the time of repayment, or
• 6 months of interest on the repaid capital at the average loan rate,
• the bank must charge the lower amount.

Some loan contracts waive IRA after a given period (for instance, no penalties after 10 years, or in case of death, redundancy, or job transfer). Others, particularly internal renegotiations, may remove penalties entirely. This is a critical clause to check before signing, especially if you are hesitating between buy or rent and expect to move within a few years.

The two formulas used to calculate IRA

In practice, the bank computes the penalty using two methods and applies the smallest result.

1. Method #1: 3% of outstanding principal

Simple formula:

IRA1 = 3% × outstanding principal

Example: outstanding principal = €180,000.

• IRA1 = 0.03 × 180,000 = €5,400.

2. Method #2: 6 months of interest

Here you compute the interest that would have been paid over 6 months on the repaid capital at the loan rate (excluding insurance):

IRA2 = annual interest on repaid capital ÷ 2

If your rate is 3.6% and you repay €180,000:

• Annual interest = 180,000 × 3.6% = €6,480.
• 6 months of interest = 6,480 ÷ 2 = €3,240.

Comparison:

• IRA1 = €5,400
• IRA2 = €3,240
• Charged IRA = €3,240 (the lower amount).

In a buy or rent comparison, this €3,240 is a one-off extra cost of the “buy” scenario, to be weighed against the rent you would have paid over the same period.

Full example: selling after 8 years – how much in early repayment fees?

Imagine a couple wondering whether to buy or rent a €300,000 apartment. They decide to buy, with the following parameters:

• Purchase price: €300,000.
• Notary fees (existing property): 8% ≈ €24,000.
• Agency fees: 4% ≈ €12,000 (often embedded in the advertised price).
• Mortgage amount: €300,000 (0% down payment for simplicity).
• Term: 25 years.
• Nominal rate: 3.6%.
• Borrower insurance: 0.30%.

After 8 years, they need to move and sell. Let’s assume the outstanding principal at that time is about €240,000 (realistic ballpark for a 25-year loan at 3.6%).

Step 1: calculate both caps

• IRA1 = 3% × 240,000 = €7,200.
• Annual interest at 3.6%: 240,000 × 3.6% = €8,640.
• IRA2 = 8,640 ÷ 2 = €4,320.

The bank must charge the lower amount, so the maximum penalty is €4,320.

Step 2: global impact on the buy scenario

At resale, the “buy” path has generated the following costs (excluding maintenance and property tax):

• Initial notary fees: €24,000.
• Interest paid over 8 years (rough estimate): about €60,000.
• Borrower insurance over 8 years: around €7,000–8,000.
• IRA: €4,320.

On the “rent” side, if they had rented a similar place for, say, €1,200/month, with annual indexation linked to the IRL, total rent might be around €115,000–120,000 over 8 years. No notary fees, no IRA, but they could have invested their savings at an investment rate of 3–5% (for example in ETFs). This is exactly the kind of trade-off a buy or rent simulator like buy-or-rent.net is designed to model.

The penalite_remboursement parameter in a buy or rent simulator

On the acheter-ou-louer.com / buy-or-rent.net engine, the penalite_remboursement parameter lets you incorporate early repayment fees into your buy or rent calculation:

• In practice, you usually enter a percentage assumption (e.g. 3% of outstanding principal) or a lump sum estimate based on your expected holding period.
• The simulator then compares the total cost of the “buy” scenario (notary fees, interest, insurance, property tax, annual tax increase, renovation costs, IRA, etc.) with the “rent” scenario (rent indexed to IRL, annual inflation, and the return on your investments via the investment rate).

The shorter your expected holding period, the more visible the impact of early repayment fees becomes in the buy or rent result.

Estimating your early repayment fees by holding period

To properly factor IRA into your buy or rent decision, you need a rough idea of when you might sell or refinance. Here are three typical cases.

Case 1: very short holding period (5 years)

You buy a €250,000 property, financed 100% over 25 years at 3.6%. After 5 years, you must move. The outstanding principal may be around €220,000.

• IRA1 = 3% × 220,000 = €6,600.
• Annual interest = 220,000 × 3.6% = €7,920.
• IRA2 = 7,920 ÷ 2 = €3,960.
• Estimated IRA: €3,960.

Over only 5 years, €3,960 is roughly €800 per year of extra cost, on top of notary and agency fees. In such short scenarios, renting plus investing your capital at a decent investment rate can often compete strongly with buying, especially once you model early repayment fees.

Case 2: medium-term sale (10 years)

Same mortgage, but you sell after 10 years. The outstanding principal might have dropped to about €200,000.

• IRA1 = 3% × 200,000 = €6,000.
• Annual interest = 200,000 × 3.6% = €7,200.
• IRA2 = 7,200 ÷ 2 = €3,600.
• Estimated IRA: €3,600.

The relative weight of IRA shrinks compared with the holding period and the principal already repaid. In a buy or rent simulator, you’ll often see that beyond a certain horizon (commonly 8–12 years, depending on the city, property tax level, rent increases and annual inflation), buying starts to look more attractive despite early repayment penalties.

Case 3: refinancing or rate renegotiation

If you refinance your loan with another bank to benefit from a lower rate (for example dropping from 3.6% to 2.5% if the market shifts), IRA usually apply unless contractually waived. You then compare:

• IRA amount (for example €4,000).
• Interest savings from the lower rate over the remaining term (for example €15,000).

In this case, paying €4,000 in IRA can still be rational if you save €15,000 overall. But if you expect to sell soon after, the benefit shrinks. The logic is very similar to buy or rent: comparing upfront costs to future savings, under inflation and alternative investment returns.

IRA and the other hidden costs of buying

Early repayment fees are only one element among many when you model the true cost of buying in a buy or rent analysis. You also need to factor in:

• Notary fees: 7–8% on existing properties, 2–3% on new builds.
• Agency fees: typically 3–5% of the purchase price, sometimes paid by the seller but embedded in the final price.
• Property tax (taxe foncière): from €450 to over €5,000 per year depending on the city, usually with annual revaluation.
• Borrower insurance: 0.25–0.45% of the loan amount per year, i.e. dozens of euros every month.
• Maintenance and renovation: including renovation cost for energy performance (DPE), façade, roof, etc.

By contrast, a tenant pays rent (with annual increases linked to the French IRL index), but can invest their initial capital at the investment rate (savings accounts, life insurance, ETFs) and stays more flexible. A robust buy or rent decision therefore requires a quantitative tool, not rules of thumb.

How to use IRA strategically in your planning

Without giving personalised financial advice, some general principles can help you think about early repayment fees in a buy or rent framework:

• If your horizon is very uncertain (less than 7 years): pay close attention to IRA, notary fees and property tax. In many cases, renting plus investing can be competitive, especially with solid investment returns.
• If you expect to stay long term (10–20 years): IRA are less critical, except if you plan a future renegotiation or refinancing.
• In a high-rate environment (like today, around 3.6%): the probability that you refinance at a lower rate later is higher, which makes IRA a central parameter when choosing your mortgage structure.
• Always benchmark against a rental scenario: including rent indexation, annual inflation and the investment performance of your savings.

In all cases, IRA should never be looked at in isolation. They are one of the many inputs in a comprehensive buy or rent comparison.

Limits and cautions

The numerical examples here are simplified and given only to illustrate how early repayment fees are calculated. They do not constitute personalised financial advice. Your actual loan terms (waiver of IRA, flexible repayments, rate type, insurance, personal profile) can materially change the numbers.

Before you sign a mortgage or decide whether to buy or rent, it is wise to:

• read your loan offer carefully (section on early repayment penalties),
• run several scenarios (sale after 5, 10, 15 years) and adjust the penalite_remboursement parameter,
• if needed, consult a professional (banker, broker, adviser) to validate the figures.

Conclusion: include early repayment fees in every buy or rent simulation

Early repayment fees (IRA) are a frequently underestimated cost, yet they can represent several thousand euros when you sell or refinance your home. Understanding their calculation (3% of outstanding principal vs 6 months of interest) and modelling them with the penalite_remboursement parameter is essential for any serious buy or rent analysis.

There is no universal answer: buying or renting depends on your personal situation, holding horizon, mortgage rates, inflation, local property tax and the return on your investments. What matters is to quantify both scenarios objectively, including all purchase-related costs and early repayment penalties.

This content is for information only and does not constitute personalised financial advice. To see the real impact of early repayment fees on your own project, test different scenarios and simulate your situation on buy-or-rent.net.