French Labour Law

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

DAIRIA Law · 2026-07-07 · 10 min

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

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

Taxable Income = Gross Salary − Deductible Employee Contributions (including deductible CSG at 6.80%) + Non-deductible CSG (2.40%) + CRDS (0.50%) + Taxable Employer Contribution for Health Insurance/Provident Fund − Exempt Overtime
It is higher than the net amount payable (as non-deductible CSG and CRDS are reintegrated) and different from the social net amount. Updated figures for 2026 (PASS, CSG/CRDS).

Introduction: Understanding Taxable Income in Payroll

Taxable income is one of the most strategic elements of the payslip. It determines the basis 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). Its construction, however, remains often misunderstood, even by experienced payroll professionals.

In 2026, several parameters influence the calculation of taxable income: non-deductible CSG, CRDS, taxable employer contribution to complementary social protection (PSC), exempt overtime, and the 1.75% deduction on the CSG/CRDS base. This complete guide will walk you through mastering this essential calculation, relying on references from the BOSS (Bulletin Officiel de la Sécurité Sociale) available at boss.gouv.fr.

What is Taxable Income?

Definition and Role on the Payslip

Taxable income, sometimes called net fiscal, corresponds to the amount of salary income subject to income tax. It has been compulsory on payslips since the reform to clarify payslips. It must not be confused with the net amount payable before tax nor with the social net amount (MNS).

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

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

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

It is essential to distinguish these three concepts:

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

Components of the Taxable Income Calculation

Gross Salary: Starting Point

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

Deductible Employee Contributions

Deductible employee contributions that can be removed from gross salary include:

  • Employee contributions to health, old age, and unemployment insurance;
  • Contributions to supplementary retirement (Agirc-Arrco);
  • Deductible CSG at 6.80%;
  • Employee contributions for provident and health insurance (employee share).

Note: The deductible CSG (6.80%) is deducted from the gross salary to determine the taxable 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 deducted from the payslip, are not deductible from income tax. They must therefore be reintegrated into taxable income. In practice, they increase the employee’s tax 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%, entirely non-deductible.

These contributions apply to 98.25% of the gross salary (after applying the 1.75% allowance), up to a limit of four annual social security ceilings (4 PASS), or €192,240 in 2026. Beyond this threshold, CSG and CRDS will apply to 100% of the remuneration, without deduction.

Deduction of 1.75% on the CSG/CRDS Base

In accordance with the BOSS, a flat-rate deduction of 1.75% is applied to active income for calculating the CSG and CRDS base. This deduction represents professional expenses. It only applies to income portions that are less than or equal to 4 PASS (i.e., €192,240 annually in 2026, or €16,020 monthly).

Example: For a gross salary of €3,200, the taxable income base for CSG/CRDS is calculated as follows: €3,200 × 98.25% = €3,144.

Taxable Employer Contribution to Complementary Social Protection (PSC)

The employer’s contribution to funding mandatory health insurance and provident fund 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 income.

In practice, if the employer covers €60 per month for health insurance and €25 per month for provident fund, totaling €85, this amount is added to the employee’s taxable income.

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

Complete Example of Calculating Taxable 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 provident fund contribution: €25

Step-by-Step Calculation

Step 1: Gross Salary = 3,200 €

Step 2: Deductible employee contributions = 3,200 – 580 – 213.79 = €2,406.21

Step 3: Reintegrate the non-deductible CSG = 2,406.21 + 75.46 = €2,481.67

Step 4: Reintegrate the CRDS = 2,481.67 + 15.72 = €2,497.39

Step 5: Reintegrate the PSC contribution = 2,497.39 + 85 = €2,582.39

Thus, the monthly taxable income is €2,582.39.

Treatment of Exempt Overtime

The Principle of Tax Exemption

Since the reactivated TEPA law, overtime (and complementary hours for part-time workers) benefit from income tax exemption up to €7,500 net per year. This cap is assessed on a calendar year basis.

In practice, the remuneration for exempt overtime is deducted from the taxable income, thereby reducing the employee’s tax base.

Impact on the Calculation of Taxable Income

If an employee has overtime for which the taxable net amount is €250 in the month, and they have not yet reached the annual limit of €7,500, then this amount will be deducted from taxable income.

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

The employer must maintain an annual cumulative total of exempt overtime to monitor compliance with the €7,500 limit. Beyond this, overtime compensation becomes taxable again.

Meal Vouchers and Taxable Income

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, which is adjusted annually in line with the first band of the income tax scale (€7.26 per voucher in 2025; check the current year’s value on the URSSAF website).

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

Transmission to the Tax Administration

Taxable income is transmitted monthly to the tax administration via the DSN. This data facilitates the calculation of the withholding tax (PAS). The personalized or neutral PAS rate directly applies to taxable income to determine the amount of tax deducted each month.

Calculation errors in taxable income have direct consequences:

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

Verification and Regularization

In case of detected errors in taxable income, the employer must carry out a regularization in DSN. It is advisable to systematically verify the consistency between the taxable income displayed on the payslip and that transmitted in the DSN, especially in cases of:

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

Special Cases Affecting Taxable Income

Daily Allowances from Social Security (IJSS)

IJSS paid by CPAM in cases of illness are taxable (except in cases related to long-term illnesses). When the employer practices subrogation, IJSS is integrated into the payslip and must be included in taxable income.

Benefits in Kind

Benefits in kind (company car, housing, meals, NTIC) are included in gross salary and thus in taxable income. Their evaluation may be either flat-rate or actual, depending on the rules of the BOSS.

Employee Savings

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

Termination Indemnities

Termination indemnities are exempt from income tax within certain limits (the greater of the legal or contractual indemnity, 50% of the total indemnity, or 2 PASS). Beyond this, the excess portion is taxable and integrated into taxable income.

Best Practices for Payroll Managers

Monthly Control Points

To ensure the accuracy of taxable income, it is recommended to implement the following controls:

  • Verify the calculation formula in the payroll software, especially after configuration updates;
  • Check the reintegration of the employer’s PSC contribution, particularly during changes to health insurance or provident fund schemes;
  • Track the cumulative total of exempt overtime to detect exceeding the €7,500 threshold;
  • Cross-reference the taxable income on the payslip with the corresponding entry in the DSN;
  • Archive payslips and supporting documents to facilitate potential audits.

Frequent Errors to Avoid

The main errors observed in practice are:

  • Omitting to reintegrate the PSC employer contribution;
  • Confusing deductible and non-deductible CSG;
  • Failing to respect the €7,500 limit for exempt overtime;
  • Applying the 1.75% deduction beyond 4 PASS;
  • Confusing taxable income and social net amount.

FAQ: Taxable Income in Payroll

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

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

Does deductible CSG reduce taxable income?

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

How should exempt overtime be treated in taxable income?

The net remuneration from overtime is deducted from taxable income up to €7,500 net per year. The employer must keep an annual cumulative total to ensure compliance with this threshold. Beyond that, overtime compensation becomes taxable again.

Is the employer’s share of the health insurance taxable?

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

How can I verify the taxable income on the payslip?

You can reconstruct the taxable income by starting from the gross salary, deducting the deductible employee contributions (including the deductible CSG), then adding the non-deductible CSG, CRDS, and taxable employer contribution to PSC. Compare the result with the “taxable income” or “cumulative taxable income” line on the payslip. In case of a discrepancy, check the treatment of exempt overtime and benefits in kind.

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