Status & contributions
Reference income
By the Finances Indépendants editorial teamUpdated on 3 min readAlso known as: N-3 income, Income from three years earlier, Provisional contributions base, Revaluation coefficient, Revenu de référence
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Contents
What is the reference income?
It is the income on which the social insurance fund calculates the year's provisional contributions. Because actual income is only known two or three years later, the law takes your net taxable professional income from the 3rd preceding year, revalued to reflect the change in prices and wages.
The reference income is therefore not an estimate of what you will earn. It is a provisional basis of calculation. It is accurate when your business is stable, and drifts further the faster your income rises or falls.
How it is calculated in 2026
For 2026 provisional contributions, the fund takes your 2023 net taxable professional income, as passed on by the tax authorities, and multiplies it by the revaluation coefficient of 1.07236269. The result then goes through the contribution scale.
For a main occupation, the scale applies 20.5% up to €75,024.54, then 14.16% up to €110,562.42, with no contribution above that. The fund's management fees come on top. The [contributions simulator](/fr/simulateurs/cotisations) runs this calculation for a given income.
- 2023 income: net taxable professional income, after expenses and social security contributions.
- Revaluation: multiplied by 1.07236269.
- Scale: 20.5% then 14.16%, split over four quarters.
No reference income: the first three years
Someone just starting out has no income from three years earlier. During their first three calendar years of activity, provisional contributions are based on a flat-rate income: for a main occupation, the minimum income of €17,374.08, or €890.42 per quarter excluding fees.
A first-time starter even pays on a reduced minimum of €8,972.07 for their first four quarters. These bases say nothing about actual income, which is why starters whose business takes off receive the heaviest [adjustments](/fr/glossaire#regularisation-cotisations).
When the year's income departs from the reference income
You can ask your fund to reduce your provisional contributions if your income for the year looks clearly lower, backed by objective evidence. For a main occupation, the reduced contribution never falls below the minimum contribution.
An over-optimistic reduction has a cost: if actual income exceeds the amount used for the reduction, the adjustment claims the difference plus surcharges. The other way round, if your income is rising, you can choose to pay higher provisional contributions to spread the later bill. Your [social insurance fund](/fr/glossaire#caisse-assurances-sociales) does the calculation.
The same three-year-old income, elsewhere
Revalued income from three years earlier is not only used for provisional contributions. The [PLCI/VAPZ](/fr/glossaire#plci) ceiling is calculated as a percentage of that income, within an absolute cap, and the contribution for continued insurance, after stopping your activity, is also based on income from three years earlier.
Not to be confused with
The terms close to Reference income and what sets them apart.
- Reference income and final income
- The reference income is the income from three years earlier, revalued, and is only used for provisional contributions. Final income is that of the contribution year itself, known two or three years later: it sets what you actually owe, at the adjustment.
- Reference income and minimum income
- The minimum income (€17,374.08 for a main occupation in 2026) is a statutory floor: it replaces the reference income when that is lower or does not yet exist, and is also the minimum base for final contributions.
Further reading
- Adjustment of social security contributions
- How social security contributions are calculated
- Contributions simulator
- Social insurance fund
- Adjustment (regularisation) of social security contributions
- Assisting spouse
- CBE, Crossroads Bank for Enterprises
- INASTI, Institut National d'Assurances Sociales pour Travailleurs Indépendants (National Institute for the Social Security of the Self-employed, NISSE)
- All glossary terms
Reference income: frequently asked questions
It is your 2023 net taxable professional income, multiplied by the revaluation coefficient of 1.07236269. Your social insurance fund obtains it from the tax authorities and calculates your provisional contributions on that amount, split over four quarters, with management fees on top.
Because the year's income is only known once tax has been assessed, two or three years later. Income from three years earlier is the most recent figure the fund knows for certain. It is revalued, then corrected at the adjustment, once actual income is known.
You can ask your fund to reduce your provisional contributions, backing the drop with objective evidence. For a main occupation, the contribution does not fall below the minimum. If your actual income ends up above the amount used, the fund will claim the difference plus surcharges.
None, since you have no income from three years earlier. For your first three years, provisional contributions are based on a flat-rate income: €17,374.08 for a main occupation, and a reduced minimum of €8,972.07 for a first-time starter during their first four quarters.
Yes. If you expect your income for the year to be clearly higher than three years earlier, you can pay higher provisional contributions. You spread the cost instead of receiving a large bill at the adjustment, two or three years later.
For a main occupation, the fund then uses the minimum income of €17,374.08: you pay the minimum contribution of €890.42 per quarter, excluding fees. This information is provided for guidance only and does not constitute personalised advice. Consult a licensed professional before making any decision.
Official source
- NISSE, How much in social security contributions do I have to pay?. View (new tab)(Official source, accessed on 2026-10-22)