Withholding tax: adjusting your instalments as a business owner in 2026

The new withholding tax rate, based on the return on 2025 income, has applied since September 2026. For a business owner whose income varies sharply from one year to the next (majority manager, SAS chairman, self-employed professional, shareholder paying themselves dividends), this rate reflects a situation that is already out of date. Adjusting it realigns personal cash flow with the reality of the year, provided the rules are respected.

Quick answer. A business owner adjusts withholding tax in the Finances publiques account, under "Gérer mon prélèvement à la source". An increase is unrestricted. A decrease is only allowed if the estimated withholding is more than 5% lower than without adjustment, and an underestimate of more than 10% exposes you to a surcharge (article 1729 G of the CGI).

Adjustment is open to every taxpayer, but it matters more for business owners because their income flows through different channels. Withholding tax takes two forms: deduction by a third-party collector (employer, pension fund) and an instalment debited directly by the tax authority from the bank account.

The remuneration of managers covered by article 62 of the CGI is not subject to withholding at source: it is included in the instalment base, calculated on its net taxable amount. The company's role as collector, for owners treated as employees, is covered in our article on withholding tax from the employer's side.

Why dividends cannot be adjusted#

Dividends are outside the scope of withholding tax: when paid, they bear a non-final flat-rate levy of 12.8%, which is an income tax advance. People whose reference taxable income for the year before last is below €50,000 (single person) or €75,000 (couple taxed jointly) can ask to be exempted, by giving a sworn statement to the paying institution within the prescribed time limits.

Adjusting your withholding rate therefore has no effect on the taxation of a dividend. However, a trade-off between remuneration and dividends changes the instalment base and must be anticipated: see our analysis of the founder's salary and dividend mix. Do not confuse this topic with interim dividends, which fall under company law.

A decrease is requested in the Finances publiques account, through the "Gérer mon prélèvement à la source" service, by declaring an estimate of the current year's income. The new rate is calculated immediately, then sent to collectors to be applied within one to three months.

The gap condition is set by article 204 J of the CGI: the estimated withholding must be more than 5% lower than the withholding you would bear without adjustment. This threshold was lowered from 10% to 5% by article 3 of the 2023 Finance Act, for income received since 1 January 2023.

The former additional condition of a gap of more than €200 was abolished by the 2020 Finance Act. Guides that still mention "more than 10% and more than €200" therefore describe a rule that no longer applies.

The official documentation gives a simple example: an estimated withholding of €750 against €1,000 without adjustment is a gap of €250, or 25%. The gap exceeds 5%, so a downward adjustment is allowed.

For instalments (BIC, BNC, article 62 management pay, rental income), a change made by the 22nd of the month applies to the debit on the 15th of the following month.

The underestimated risk. The calculation covers all of the household's income subject to withholding, not just the owner's remuneration. A manager who cuts their pay but whose spouse's income rises may not meet the gap condition, or only just. Make the estimate at household level, including rental income and any exceptional income.

An upward adjustment is unrestricted: it is not subject to any gap condition. The increased rate or instalment applies in principle until 31 December of the year of the request.

Adjusting upwards makes sense when the current year will be clearly better than the one used to calculate the rate: a sharp rise in profits from a liberal profession, an increase in management pay, the first full year after setting up. Without a voluntary increase, the gap is paid as a balance the following autumn, in one go or in four debits.

Our view. For a business owner, adjustment is a personal cash-flow tool, not a tax lever: it does not change the final tax, only its timing. At the firm, we advise basing the decision on the company's interim accounts (or on the sole trader's forecast) rather than on intuition. A voluntary increase avoids a heavy balance in September; a cautious decrease is only justified if the fall in income is documented.

Article 1729 G of the CGI provides for a 10% surcharge when the last estimated withholding following a downward adjustment is more than 10% lower than the amount that should have been withheld given the year's actual income. The surcharge base is the difference between the withholding that should have been borne and the withholding actually borne.

When the gap exceeds 30%, the surcharge rate becomes equal to half of the gap, expressed as a percentage. A 50% gap would thus lead to a surcharge at a rate of 25% of the difference, under the mechanism described by the text.

The surcharge does not apply when the taxpayer shows that the incorrect estimate was made in good faith at the date of the request, or that it resulted from factors that were hard to foresee at that date. So keep the items that supported your estimate: accounting position, forecast, emails about a lost client, shareholder decision on remuneration.

A self-employed person can defer certain instalments, subject to conditions, but cannot suspend them at will. Deferral is reserved for holders of BIC, BNC and BA income; other instalment payers, notably for rental income, cannot use it and pay monthly or quarterly.

Cancelling the instalment is possible on cessation, meaning the abandonment of all activities within the same income category. A partial sale or a change of activity is not a cessation. For rental income, cancellation applies when all lettings stop.

Deferral shifts the charge without erasing it: the deferred instalment is added to the next one. It addresses a one-off cash-flow dip, not a lasting fall in income, for which a downward adjustment is the appropriate tool.

In practice. Instalments are debited on the 15th of each month, or quarterly on 15 February, 15 May, 15 August and 15 November. The quarterly option applies for the whole year and takes effect on 1 January of the following year if exercised before 30 September: a request made before 30 September 2026 will apply from January 2027.

Adjustment is prepared in four stages, before anything is entered online.

1. Estimate the year's income. Start from the current accounting position and the remuneration voted for 2026, then add rental income and your spouse's income.
2. Compare with the instalment base. From January to August, the instalment is based on income from the year before last; from September to December, on the previous year's income. Measure the gap as a percentage.
3. Adjust in your personal account. In "Gérer mon prélèvement à la source", enter the estimate; check that the gap exceeds 5% for a decrease, and note the new rate or instalment.
4. Monitor the gap to avoid the penalty. Update the estimate at each significant event (new contract, distribution, sale) and keep the documents supporting the request.

• The 2026 interim accounts or forecast are available.
• The owner's 2026 remuneration has been decided by the competent body.
• The spouse's income and rental income are included in the estimate.
• The calculated gap exceeds 5% for a decrease.
• A safety margin is kept relative to the 10% threshold of article 1729 G.
• Planned dividends are handled separately (12.8% advance or exemption).
• The documents supporting the estimate are archived.

A rate adjusted downwards applies in principle until 31 December 2026; on 1 January 2027, the rate from your latest income tax return takes over again. If the fall in income continues, you must therefore repeat the process at the start of the year.

A couple can opt for an individualised rate, which splits withholding according to each spouse's income without changing the household's total tax. This option is separate from adjustment, and useful when the spouses' incomes are very different, for example when only one of them is a business owner with variable income.

Corporate income tax follows a completely different instalment logic, specific to the company: see corporate income tax instalments. And if you are still unsure about your social status, our comparison of self-employed or employee-like status details the effects on how tax is collected.

• An upward adjustment is unrestricted; a decrease requires a gap of more than 5% (article 204 J of the CGI, since 2023).
• The €200 condition was abolished by the 2020 Finance Act and the 10% threshold lowered to 5% by the 2023 Finance Act.
• An underestimate of more than 10% exposes you to a 10% surcharge, rising to half the gap beyond 30% (article 1729 G of the CGI), unless in good faith.
• Dividends are outside withholding tax: they bear a 12.8% advance on payment.
• A self-employed person can defer certain instalments under conditions; rental income instalments cannot be deferred.
• The quarterly option requested before 30 September 2026 takes effect in January 2027.