The differential calculation of the debt ratio allowed rental investors to present a more favorable profile to banks. Since the HCSF made its recommendations binding on January 1, 2022, this method is no longer supposed to serve as an official basis for granting mortgage credit. However, the reality on the ground shows banking practices that are far less uniform than the regulations suggest.
Classic Method vs. Differential Method: What the Numbers Change on a File
With the classic method, the bank adds up all the credit charges on one side, all the income on the other, and then divides the charges by the income. The rents received are included in the income after a discount, but the monthly payments of the rental loan are added to the total charges.
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The differential calculation worked differently. It subtracted the monthly payment of the rental loan directly from the rents received to obtain a balance. If this balance was positive, it increased the income. If it was negative, it added to the charges. This mechanism significantly reduced the displayed debt ratio.
| Criterion | Classic Calculation | Differential Calculation |
|---|---|---|
| Treatment of Rents | Added to income (after discount) | Directly offset against the monthly payment of the rental loan |
| Treatment of Rental Monthly Payment | Added to all charges | Deducted from rents before calculation |
| Debt Ratio Obtained | Higher | Lower |
| Applicable HCSF Threshold | 35% maximum | 35% maximum (but reached less quickly) |
| Advantaged Profile | First-time buyer of a primary residence | Multi-property investor |
For an investor who already owns one or two rental properties, the difference between the two methods is not marginal. It can shift a file from “financeable” to “rejected,” or vice versa, depending on the bank approached. Understanding differential calculation in banking remains a concrete lever for structuring an investment project.
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Mutual Banks and Differential Calculation: Documented Regional Heterogeneity
The HCSF’s decision applies to all institutions. On paper, no bank can now display a debt ratio calculated using the differential method to grant a loan. In practice, several mutual networks continue to use this method for internal analysis.
Regional banks belonging to Crédit Mutuel, Banques Populaires, Caisses d’Épargne, or Crédit Agricole are regularly cited by brokers as maintaining the differential to refine the study of investor files. They then communicate a debt ratio using the classic method to remain compliant with HCSF requirements.
Variable Practices Within the Same Group
The point that complicates any attempt at an exhaustive list is the strong intragroup heterogeneity. Two regional banks from the same network can apply opposing policies. One may retain the differential as a decision-making aid, while the other may have completely abandoned it.
This disparity is explained by the decentralized governance of mutual banks. Each local or regional bank has a margin of discretion regarding its lending criteria, as long as it respects the regulatory framework on the surface.
- Crédit Mutuel: some regional federations still use the differential internally, others do not
- Crédit Agricole: regional banks apply their own grids that may include a differential analysis for multi-equipped profiles
- Banques Populaires and Caisses d’Épargne (BPCE network): feedback from brokers indicates variable practices depending on the agencies
For a borrower, this means that a rejection at one agency of a given network does not preclude the response from another agency of the same network in a different region.
Tolerance for Historical Clients: A Little Visible Transitional Practice
Beyond internal analysis, another mechanism persists. Several institutions that have officially abandoned the differential continue to apply it temporarily for their already multi-equipped clients.
The objective is both commercial and prudent. An investor who holds three or four loans with the same bank represents a significant outstanding amount. Refusing him a fifth financing based on a change in calculation method, while his repayment history is impeccable, creates a risk of losing the client to a more flexible competitor.
How This Tolerance Materializes
The bank presents the file using the classic method in its regulatory reports. However, the decision to grant is based on a dual reading of the debt ratio: the classic for compliance, the differential for the economic reality of the file. This practice is not documented in any official scale. It mainly comes from feedback from brokers specializing in rental investment.
The profiles that benefit from it generally share several characteristics:
- Longevity of the banking relationship (several years, often with income domiciliation)
- Repayment history without incident on existing loans
- Personal contribution or residual savings after the operation deemed sufficient by the institution
- Rental income actually received and justified over several periods
Debt Ratio at 35% and HCSF Derogation Margin: The Real Flexibility Framework
The HCSF allows banks to deviate from the 35% debt ratio limit for a portion of their quarterly credit production. This derogation margin constitutes the legal framework within which some rental investment files are approved despite a classic debt exceeding the threshold.
The derogation does not rely on the differential calculation as such. It simply allows the bank to grant a loan to a borrower whose classic debt ratio exceeds 35%, provided the solidity of the file is justified. Rental investors with documented positive cash flow are among the profiles that capture a share of these derogations.
Again, the policy for using this margin varies from bank to bank. Some reserve it almost exclusively for first-time buyers of primary residences. Others also allocate it to investors, especially when the setup relies on stable and verified rental income.
The differential calculation has therefore not disappeared from the banking landscape. It has changed status: from an official tool for calculating the debt ratio, it has become a complementary analysis instrument used behind the scenes.
For an investor, the chosen bank and the regional branch approached are as important as the intrinsic quality of the file. Multiplying contacts, even within the same mutual network, remains the most concrete strategy to identify the institution whose internal practice matches the project’s profile.