How to Calculate Taxable Net Income on Payslips in 2026: Complete Guide

In brief — how to calculate taxable net income. The taxable net income (or “net fiscal”) is the amount that serves as the basis for income tax. It is calculated from the gross salary:

Taxable Net Income = Gross Salary − Deductible Employee Contributions (including deductible CSG at 6.80%) + Non-deductible CSG (2.40%) + CRDS (0.50%) + Taxable Employer Contribution for Supplemental Health Insurance − Exempt Overtime

It is higher than the net payable (the non-deductible CSG and CRDS are reintegrated) and different from the net social amount. Update on 2026 parameters (PASS, CSG/CRDS).

Introduction: Understanding Taxable Net Income in Payroll

The taxable net income is one of the most strategic elements of the payslip. It determines the base on which the employee will be taxed for income tax and constitutes the data transmitted to the tax administration via the DSN (Déclaration Sociale Nominative). Yet, its calculation is often misunderstood, even by experienced payroll professionals.

In 2026, several parameters influence the calculation of taxable net income: non-deductible CSG, CRDS, the taxable employer contribution for supplemental social protection (PSC), exempt overtime, or the 1.75% deduction on the basis of CSG/CRDS. This comprehensive guide will guide you step by step in mastering this essential calculation, based on the references from the BOSS (Bulletin Officiel de la Sécurité Sociale) available at boss.gouv.fr.

What is Taxable Net Income?

Definition and Role on the Payslip

The taxable net income, sometimes referred to as net fiscal, corresponds to the amount of salary income subject to income tax. It has been mandatory on the payslip since the reform aimed at clarifying payslips. It should not be confused with the net payable before tax or the net social amount (MNS).

In practical terms, taxable net income is calculated using the following formula:

Taxable Net Income = Gross Salary – Deductible Employee Contributions + Non-deductible CSG (2.40%) + CRDS (0.50%) + Taxable Employer Contribution for PSC

Differences Between Taxable Net Income, Net Payable, and Net Social Amount (MNS)

It is essential to differentiate these three terms:

• Net Payable Before Tax: This is the amount that the employee actually receives in their bank account before tax withholding (PAS).
• Taxable Net Income: This is the calculation base for income tax. It is higher than the net payable because it reintegrates the non-deductible CSG and the CRDS.
• Net Social Amount (MNS): Introduced in 2023, it serves as a reference for social benefits (RSA, activity bonus). It differs from the taxable net income because it does not include the same adjustments.

Components of the Taxable Net Income Calculation

Gross Salary: The Starting Point

The calculation of the taxable net income starts from the gross salary, which includes all elements of remuneration: base salary, bonuses, perks, overtime, various allowances subject to contributions. For an employee earning a monthly gross salary of €3,200, this amount serves as the starting point.

Deductible Employee Contributions

From the gross salary, all mandatory deductible employee contributions for income tax are deducted. This includes:

• Health, old-age, and unemployment insurance contributions;
• Complementary retirement contributions (Agirc-Arrco);
• The deductible CSG at 6.80%;
• Employee contributions for health and pre-emptive insurance (employee part).

Note: The deductible CSG (6.80%) is indeed deducted from the gross to obtain the taxable net income, but the non-deductible CSG (2.40%) and CRDS (0.50%) are not.

Non-deductible CSG (2.40%) and CRDS (0.50%)

These two contributions, although withheld on the payslip, are not deductible from income tax. Therefore, they need to be reintegrated into the taxable net income. Essentially, they increase the employee’s taxable base.

In 2026, the applicable rates are:

• Total CSG: 9.20%, of which 6.80% is deductible and 2.40% is non-deductible;
• CRDS: 0.50%, fully non-deductible.

These contributions apply to 98.25% of the gross salary (after applying the 1.75% deduction), up to 4 annual social security ceilings (4 PASS), which amounts to €192,240 in 2026. Beyond this threshold, CSG and CRDS are applied to 100% of the income without deduction.

The 1.75% Deduction on the CSG/CRDS Base

According to the BOSS, a flat-rate deduction of 1.75% is applied to wage income to calculate the CSG and CRDS base. This deduction represents professional expenses. It applies only to the portion of remuneration equal to or less than 4 PASS (or €192,240 annually in 2026, or €16,020 monthly).

Example: For a gross salary of €3,200, the CSG/CRDS base is: €3,200 × 98.25% = €3,144.

Taxable Employer Contribution for Supplemental Health Insurance (PSC)

The employer’s contribution to the funding of mandatory health insurance and pre-emption constitutes a taxable benefit for the employee. Although it is not subject to social security contributions (within certain limits), it must be reintegrated into the taxable net income.

In practice, if the employer covers €60 per month for health insurance and €25 per month for pre-emption, the total amount of €85 is added to the employee’s taxable net income.

BOSS reference: the employer’s PSC contribution is subject to CSG/CRDS but excluded from the social security contributions base within the limits set by Article L.242-1 of the Social Security Code.

Complete Example of Calculating Taxable Net Income in 2026

Example Data

Let’s take the case of a managerial employee with the following elements:

• Gross monthly salary: €3,200
• Total employee contributions (excluding CSG/CRDS): €580
• Deductible CSG (6.80% × 98.25% × 3,200): €213.79
• Non-deductible CSG (2.40% × 98.25% × 3,200): €75.46
• CRDS (0.50% × 98.25% × 3,200): €15.72
• Employer’s health insurance contribution: €60
• Employer’s pre-emptive contribution: €25

Step-by-Step Calculation

Step 1: Gross Salary = 3,200 €

Step 2: Deduction of deductible employee contributions = 3,200 – 580 – 213.79 = 2,406.21 €

Step 3: Reintegration of non-deductible CSG = 2,406.21 + 75.46 = 2,481.67 €

Step 4: Reintegration of CRDS = 2,481.67 + 15.72 = 2,497.39 €

Step 5: Reintegration of employer’s PSC contribution = 2,497.39 + 85 = 2,582.39 €

Therefore, the monthly taxable net income is 2,582.39 €.

The Treatment of Exempt Overtime

The Principle of Tax Exemption

Since the reactivated TEPA law, overtime (and complementary hours for part-time jobs) are eligible for an income tax exemption up to €7,500 net per year. This ceiling is assessed on a calendar year.

In practice, the remuneration for exempt overtime is removed from taxable net income, reducing the employee’s taxable base.

Impact on Taxable Net Income Calculation

If an employee performs overtime whose net taxable remuneration amounts to €250 in the month, and they have not yet reached the annual ceiling of €7,500, this amount will be deducted from the taxable net income.

Example: Let’s take our employee with a taxable net income of €2,582.39. If they performed exempt overtime for €250, their taxable net income becomes: 2,582.39 – 250 = €2,332.39.

The employer must keep an annual cumulative record of exempt overtime to ensure compliance with the €7,500 ceiling. Beyond this, the remuneration for overtime becomes taxable again.

Meal Vouchers and Taxable Net Income

Tax-exempt Employer Contribution and Limits

The employer’s contribution to meal vouchers is exempt from income tax within certain limits. The employer’s share is exempt if it meets the following conditions:

• It represents between 50% and 60% of the voucher’s value;
• It does not exceed the exemption ceiling, renewed annually in the same proportions as the first bracket of the income tax scale (€7.32 per voucher as of January 1, 2026; BOSS, art. 81-19° of the CGI).

If the employer’s contribution meets these limits, it does not need to be reintegrated into the taxable net income. However, any excess must be added to the employee’s taxable net income.

The Link Between Taxable Net Income and DSN

Transmission to the Tax Administration

The taxable net income is transmitted monthly to the tax administration via the DSN. This data allows for the calculation of the withholding tax (PAS). The PAS rate, personalized or neutral, applies directly to the taxable net income to determine the amount of tax withheld each month.

Errors in calculating taxable net income therefore have direct consequences:

• On the amount of PAS withheld monthly;
• On the employee’s pre-filled income tax declaration;
• On potential URSSAF or tax audits.

Verification and Regularization

In case of an error detected in the taxable net income, the employer must proceed with a regularization in DSN. It is recommended to systematically check the consistency between the taxable net income displayed on the payslip and that transmitted in DSN, especially in cases of:

• Salary adjustments;
• Contribution regularizations;
• Changes in situation (part-time, sick leave, etc.).

Particular Cases Affecting Taxable Net Income

Daily Social Security Indemnities (IJSS)

The IJSS paid by the CPAM in case of illness are taxable (except exceptions related to a long-term illness). When the employer practices subrogation, IJSS are included in the payslip and must be reflected in the taxable net income.

Benefits in Kind

Benefits in kind (company vehicle, housing, meals, NTIC) are included in the gross salary and therefore in the taxable net income. Their valuation can be flat-rate or actual, depending on the BOSS rules.

Employee Savings

Amounts paid under profit-sharing or participation are not taxable if they are allocated to a savings plan (PEE, PER collective). However, if the employee opts for immediate payment, these amounts are added to the taxable net income.

Severance Indemnities

Severance payments are exempt from income tax under certain limits (the higher of the legal or contractual compensation, 50% of the total indemnity or 2 PASS). Beyond that, any excess is taxable and integrated into the taxable net income.

Best Practices for Payroll Managers

Monthly Control Points

To ensure the accuracy of the taxable net income, it is recommended to put in place the following controls:

• Verify the calculation formula in the payroll software, especially after configuration updates;
• Check the reintegration of the employer’s PSC, particularly during changes in health or preemptive insurance arrangements;
• Monitor the cumulative amount of exempt overtime to detect crossing the €7,500 threshold;
• Match the taxable net income from the payslip with the corresponding section in DSN;
• Archive payslips and supporting documents to facilitate potential audits.

Common Errors to Avoid

The main errors observed in practice are:

• Forgetting to reintegrate the employer’s PSC;
• Confusing between deductible and non-deductible CSG;
• Not respecting the €7,500 limit for exempt overtime;
• Applying the 1.75% deduction above 4 PASS;
• Confusing taxable net income and net social amount (MNS).

FAQ: Taxable Net Income in Payroll

What is the difference between taxable net income and net social amount (MNS)?

The net social amount (MNS) serves as a reference for social benefits (RSA, activity bonus), while the taxable net income serves as a basis for income tax calculation. The two amounts differ primarily in the treatment of non-deductible CSG, CRDS, and certain remuneration elements. MNS does not reintegrate the same elements as taxable net income.

Does deductible CSG reduce taxable net income?

Yes. The deductible CSG (6.80%) is subtracted from the gross salary to calculate taxable net income. In contrast, the non-deductible CSG (2.40%) and the CRDS (0.50%) are not deducted and therefore increase the taxable net income compared to net payable.

How to Treat Exempt Overtime in Taxable Net Income?

The net remuneration for exempt overtime is deducted from the taxable net income within the limit of €7,500 net per year. The employer must keep an annual cumulative record to ensure compliance with this ceiling. Beyond that, the overtime remuneration becomes taxable again.

Is the employer’s contribution for health insurance taxable?

Yes. The employer’s contribution to fund mandatory health insurance (and preemptive insurance, where applicable) constitutes a taxable benefit. It must be reintegrated into the employee’s taxable net income, even if it is exempt from social contributions within certain limits.

How to Verify Taxable Net Income on the Payslip?

You can reconstruct the taxable net income starting from the gross salary, subtracting the deductible employee contributions (including the deductible CSG), then adding the non-deductible CSG, the CRDS, and the employer’s PSC contribution. Compare the result with the “taxable net income” or “cumulative taxable net income” line on the payslip. In case of discrepancies, verify the treatment of exempt overtime and benefits in kind.