A mortgage is a contract by which a banking institution provides a sum intended to finance the purchase of a home, a building plot, or construction and renovation work. The amount, repayment duration, and interest rate determine the total cost of the operation for the borrower.
Debt ratio and HCSF rules: the framework that conditions every mortgage application
Before comparing loan offers, it is essential to understand the regulatory framework that mechanically limits borrowing capacity. The High Council for Financial Stability (HCSF) maintains its two central rules in 2026: a debt ratio capped at 35% of income and a maximum repayment duration set at 25 years.
These criteria have not been relaxed despite requests from the French Banking Federation. However, the margin of exemption granted to banks has increased to 18.1% of production in the second quarter of 2026, compared to 16% a year earlier. In practice, institutions can accept more applications that slightly exceed the thresholds, provided they justify them.
To assess the feasibility of a project, it is possible to consult www.btb-immobilier.com for a loan and obtain a preliminary estimate tailored to one’s situation.
The calculation of the debt ratio includes all repayment charges relative to net income. Regular bonuses, existing rental income, and professional stability weigh in the overall assessment of the application by the bank.
Amortizable loan, bullet loan, PTZ: choosing the structure suited to your project
The fixed-rate amortizable loan remains the foundation of real estate financing in France. Each monthly payment repays a portion of the capital and a portion of interest, with a schedule known from the signing. This type of loan is suitable for the majority of primary residence purchase projects.
The variable-rate loan indexes monthly payments to a reference index. The total cost may decrease if rates drop, but it can also increase. This mechanism exposes the borrower to uncertainty regarding the duration or amount of repayments.
The bullet loan works differently: the borrower only repays the interest for the entire duration of the contract, then repays the capital in one lump sum at maturity. This structure is primarily aimed at rental investors who wish to increase the tax deduction of interest.
The zero-interest loan expanded to the entire territory
The PTZ is now accessible throughout the French territory and can contribute to the financing of a new individual house, subject to income conditions. This development broadens its appeal beyond just new apartments in tight areas.
The PTZ only finances part of the operation. It must be combined with one or more other loans. Its main advantage: no interest is owed by the borrower, which reduces the overall cost of financing.
Real cost of the mortgage: nominal rate, APRC, and borrower insurance
The nominal rate displayed by the bank reflects only part of the cost. The APRC (annual percentage rate of charge) includes all mandatory fees:
- Interest calculated on the remaining capital due according to the nominal rate of the contract
- Processing fees charged by the lending institution, usually expressed as a percentage of the borrowed amount or as a flat fee
- The cost of the guarantee (mortgage, bank guarantee, or lender privilege), which varies significantly depending on the chosen mechanism
- Borrower insurance premiums, often the second largest expense after interest
Borrower insurance deserves special attention. The Lemoine law allows changing insurance at any time, without fees or penalties, provided the new contract offers at least equivalent guarantees. Comparing insurances can significantly reduce the total cost of the loan.
Borrowing capacity and personal contribution: calibrating your financing
Borrowing capacity directly stems from the maximum debt ratio of 35%. It depends on net income, existing charges, and the planned repayment duration. The longer the duration, the higher the amount that can be borrowed, but the total cost of the loan also increases.
The personal contribution represents the portion of the project financed without resorting to a loan. It generally covers notary fees and a fraction of the purchase price. A higher contribution allows for a better rate and reduces the repayment duration.
Professional stability and remaining disposable income
Banks assess the strength of the application beyond just the debt ratio. The remaining disposable income after monthly repayments is a determining criterion. A borrower with high but irregular income may face a discount on the resources taken into account.
The ACPR confirms that the production of housing loans increased in 2025 without significant relaxation of granting criteria. Requirements regarding income, contribution, and professional stability remain largely maintained.
- A permanent contract outside the trial period facilitates access to credit, but self-employed and freelance professionals can borrow by justifying several years of regular activity
- Co-borrowers combine their incomes, which increases borrowing capacity while sharing the risk
- Banking management of recent months (absence of overdraft, regular savings) weighs in the bank’s final decision
The rebound in the credit market observed since 2025 reflects a more favorable context for borrowers, without meaning that banks accept all profiles. A well-structured application remains the condition for accessing the best financing conditions.
