You receive two or three mortgage loan offers, the rates are similar to within a few tenths, and the natural reflex is to sign the cheapest one. However, the nominal rate only represents a fraction of the actual cost of your credit. Between borrower insurance, required guarantees, and early repayment conditions, two offers displaying the same rate can generate several thousand euros of difference over the total duration of the loan.
Usury rate and mortgage credit: a legal constraint to check first
Before even comparing the offers, you must verify that your financial arrangement falls below the legal ceiling. The usury rate sets the maximum allowable rate, including insurance and fees, for any mortgage loan granted by a bank.
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Since July 1, 2026, the thresholds revised by the Banque de France are established as follows according to Service-public.fr:
| Loan Duration | Applicable Usury Rate |
|---|---|
| Less than 10 years | 4.07 % |
| From 10 to less than 20 years | 4.57 % |
| 20 years and more | 4.80 % |
Why does this table matter so much for your project? Because a credit offer with an APR (annual percentage rate) exceeding these thresholds will simply be refused by the bank itself. If your borrower profile presents a medical risk or if you are older, the additional cost of insurance may be enough to exceed the limit.
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Comparing only the nominal rate between two banks ignores this lock. Before negotiating, calculate your projected APR by including all fees: it is this that determines whether the offer is legally viable.
To explore different financing configurations, you can compare credit offers on Alias Immo and refine your search according to the duration and amount considered.
APR of the mortgage loan: the only reliable indicator for comparison
The nominal rate is the price of the borrowed money. The APR is the price of the entire arrangement. It adds up the interest rate, borrower insurance, processing fees, guarantee fees (mortgage or surety), and any brokerage fees.
Let’s take a simple example. You receive two offers for a 20-year loan:
- Bank A: nominal rate of 3.30 %, group insurance at 0.36 %, processing fees of 1,200 euros, bank guarantee
- Bank B: nominal rate of 3.45 %, external insurance at 0.15 %, processing fees waived, conventional mortgage
- Bank C: nominal rate identical to Bank A, but with early repayment penalties capped at six months of interest
Bank A seems to be the winner at first glance. But once the insurance and fees are included, the APR of Bank B may turn out to be lower by several tenths. Over 20 years of repayment, this difference represents significant savings.
The APR is mandatory on every loan offer. It is the figure to compare as a priority, not the rate displayed in your agency’s window.
Loan duration and total cost: a frequently underestimated trade-off
The average duration of mortgage loans is at a historically high level, with repayments often extending beyond 20 years. The average rate observed in June 2026 is around 3.25 %, with variations depending on the durations: about 3.3 % over 15 years, 3.4 % over 20 years, and nearly 3.5 % over 25 years.
Extending the duration reduces the monthly payment but increases the total cost of credit. Shortening the duration increases the monthly effort but decreases the total interest paid. The best offer is not always the one that proposes the lowest monthly payment; it is the one that matches your actual repayment capacity without putting you under financial strain.
Borrower insurance: the most profitable negotiation lever
Borrower insurance can represent a significant part of the total cost of your credit. Banks systematically offer their group contract, but you have the right to choose external insurance (insurance delegation) at any time, including after signing the loan.
The price difference between a group contract and individual insurance depends on your age, health status, and profession. For a young, non-smoking borrower, the gap can be substantial.
Are you buying together? The distribution of the insurance share (the portion covered for each co-borrower) deserves special attention. A share of 100 % on each head fully protects the household in case of death but costs double that of a 50/50 split. The right dosage of the share depends on the respective incomes of each borrower and the level of risk you accept.
Early repayment conditions and loan flexibility
You might think you will stay in your home for 20 years. Statistically, most borrowers sell or repay their loan well before the term. The early repayment penalties (IRA) specified in the contract then become a concrete selection criterion.
The law caps these penalties, but some banks completely eliminate them to attract new clients. If you plan to sell within the next ten years, or if an inheritance or a change in income could allow you to pay off the loan, check this clause before signing.
The flexibility of the loan is another criterion rarely compared. Some offers allow for changes in monthly payments (up or down) once a year, at no cost. Others impose a waiting period or limit the extent of the modification. This flexibility protects your budget in case of unforeseen events (job loss, birth, change in situation).
Building a solid borrower file speeds up processing times
Banks prioritize complete and readable files. Providing your last three pay slips, your last two tax notices, your account statements without recent overdrafts, and a clear financing plan from the very first request reduces the time it takes to obtain the loan offer.
A well-prepared file also sends a signal of seriousness that facilitates rate negotiation. The bank assesses a risk: the lower this risk appears, the more it is willing to lower its margin.
Your choice of mortgage loan offer relies on a cross-reading of the APR, the cost of insurance, early repayment conditions, and the flexibility of the contract. Comparing two offers based solely on the nominal rate is like comparing two cars based on their color. The total cost of financing, however, is found in the details of the contract.