Correcting Swiss withholding tax: steps and example for 2026

A late update to family circumstances, an incorrect tariff or a missing bonus can change withholding tax. Establish the correct fact, its effective date and affected periods, then document the difference. Deleting the old payslip would remove that explanation.

References and examples: 2026.

Distinguish two procedures

An employer payroll correction repairs a fact or calculation in the salary file and, if needed, the cantonal return. A taxpayer's personal application follows a separate tax procedure.

In Geneva, a rectification or subsequent ordinary assessment request, DRIS/TOU, must be filed by 31 March following the year of deductions. This deadline and procedure do not replace the employer's correction process. Official Geneva guidance.

Correct in six steps

1. Document the reason: keep the request, decision or supporting evidence.
2. Confirm the effective date: when you learn about a change is not necessarily when its rule takes effect.
3. Identify affected payslips: an annual-model correction may affect cumulative figures and later deductions.
4. Compare old and new calculations: distinguish differences in gross pay, contributions, tax and net pay.
5. Approve the treatment: arrange the additional payment or permissible recovery; check conditions before deducting a debt from salary.
6. Reconcile documents: align the corrected payslip, accounting entries, cantonal return and annual documents where necessary.

Treatment depends on the canton and situation. FTA Circular 45 and cantonal instructions provide the calculation and procedural framework.

Example: too much tax withheld

Suppose the initial calculation deducted CHF 300, but the documented corrected amount is CHF 240. If other items stay unchanged, the employee is owed CHF 60 more net pay, and the tax liability decreases by CHF 60.

If CHF 300 has already been paid to the canton, reconcile the CHF 60 with a confirmed refund or offset. It is not automatically a bank receipt. These figures are fictional and imply no official rate.

How BMT makes the work easier

BMT retains dated facts and flags approved payslips affected by a change. It prepares a comparison and a separate correction for approval. The original is preserved. Amounts to pay or recover are tracked with evidence, while document preparation, submission and acceptance remain distinguishable.

Read more: monthly and annual models · accounting entries.

FAQ

Does changing an employee's canton recalculate approved payslips?

Not in this workflow. The dated change identifies potential impact; an explicit correction must then be prepared and approved.

Can I correct only the accounting entry?

Check the payslip and tax return too. An isolated entry can leave three documents with three different amounts.

Must the employee always request subsequent ordinary assessment?

No. Employer corrections and personal tax applications address different situations. Confirm the applicable procedure with the canton.