You are borrowing for twenty years. Two banks are offering you a rate that differs by 0.25 points. On a loan of 250,000 euros, this difference represents several thousand euros in additional interest. Comparing mortgage rates is not just about reading an online barometer: it requires understanding what each bank values in a file, and why the displayed rate is almost never the one you will actually get.
Nominal rate, APR and borrower insurance: three figures to read together
The nominal rate is the one that appears prominently in advertisements. It corresponds to the interest paid to the bank, calculated on the remaining capital owed. But this figure alone says nothing about the actual cost of your loan.
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The APR (annual percentage rate) includes processing fees, guarantees, and borrower insurance. It is the only indicator that allows you to compare two loan offers on an equal basis. A bank may display an attractive nominal rate while charging a costly group insurance, which negates the apparent advantage.
Borrower insurance weighs heavily in the final bill. Since the Lemoine law, you can change your insurance at any time. Opting for external insurance delegation often helps to reduce the overall cost of the loan, sometimes even more than a decrease in the nominal rate. Before signing, a comparison of mortgage rates including the APR and the cost of insurance remains the most reliable approach.
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Borrower profile and loan duration: what causes rate variation from one bank to another
You may have noticed that two colleagues with the same salary receive different rates. The reason is simple: each bank targets a specific type of borrower profile.
Some institutions favor civil servants for the stability of their income. Others reserve their best rates for high earners or rental investors. According to data published by Pretto in May 2026, Société Générale and Banque Populaire favor public agents, CCF targets incomes above 50,000 euros per year, and LCL focuses on rental investment.
The duration of the loan also plays a direct role. In May 2026, the average market rates are around 3.18% for 15 years, 3.32% for 20 years, and 3.43% for 25 years according to data from Cafpi and Reassurez-moi. The longer the duration, the higher the rate increases, because the risk for the bank extends over time.
Three concrete levers to improve your file
- Personal contribution: a contribution covering at least the notary fees reassures the bank and facilitates obtaining a lower rate. A higher contribution reduces the borrowed capital and thus the risk.
- Debt ratio: banks check that your repayment installments do not exceed about one-third of your net income. A file below this threshold obtains better conditions.
- Income domiciliation: agreeing to domicile your salary in the lending bank constitutes a consideration that many institutions value by offering a discount on the rate.
Expanded PTZ in 2026: a game-changing lever for first-time buyers
The zero-interest loan was expanded in 2026 to all new housing across the entire French territory. This regulatory change, confirmed by Service-public.fr, alters the comparison between banks for first-time buyers.
Why does this matter in choosing your bank? Because not all banks offer the PTZ with the same flexibility. Some integrate the PTZ into the financial arrangement smoothly, while others impose additional conditions or longer processing times.
A first-time buyer who combines a PTZ with a conventional loan reduces the portion of capital subject to interest. The total cost of the loan mechanically decreases, and the gap between two bank offers widens when one optimizes this arrangement and the other does not.
Displayed rates and negotiated rates: why the scale does not reflect your offer
The barometers published each month by brokers display three levels: the lowest rate, the average rate, and the market benchmark rate. In May 2026, Cafpi indicates, for example, a lowest rate of 3.05% for 20 years, compared to a benchmark rate of 3.84% for the same duration. The gap exceeds 0.75 points.
The rate you will obtain lies somewhere between these two extremes, depending on your profile. The best published rates correspond to the first decile: only one borrower in ten obtains them. The benchmark rate represents what the bank offers without any particular negotiation.
This is where direct negotiation or the use of a broker comes into play. A broker compares the offers of several partner banks and negotiates based on your file. The benefit is twofold: saving time and accessing pricing grids that are sometimes inaccessible at the agency.
The usury rate, a ceiling to watch
The usury rate set by the Banque de France defines the maximum APR that banks can apply. In 2026, this ceiling offers a more comfortable margin than in 2022-2023, a period when many files were blocked. The risk of refusal for exceeding the usury rate is now much lower, which facilitates access to mortgage credit, including for less favored profiles.
Comparing mortgage loan offers is not just about identifying the bank that displays the lowest rate in a given month. The nominal rate varies according to your profile, your contribution, and the chosen duration. Borrower insurance weighs as much as the rate itself. And the expanded PTZ in 2026 adds an additional variable for first-time buyers. The only reliable method remains to request several personalized simulations, systematically including the APR in the comparison.