| Factor | Withholding tax | Tax return |
|---|---|---|
| Child deduction | By tarif only | Deductible |
| Commute | Not applicable | Deductible |
| Education | Not applicable | Deductible |
| Medical expenses | Not applicable | Above threshold |
| Pillar 3a | Not deductible | Fully deductible |
| Mortgage interest | Not deductible | Fully deductible |
| Basis | Monthly income | Annual income |
| Reversible? | Switch possible | Permanent — no going back |
| Risk of higher taxes | No risk | Possible in 10–20% of cases |
Withholding tax is deducted directly from your salary and is a flat-rate tax for residents without a C residence permit or Swiss passport.
It simplifies the tax process and allows for automatic tax settlement. With withholding tax, there is no annual tax return, which many see as an advantage. The tax burden is calculated based on monthly income.
With retroactive ordinary assessment, the entire income and assets of a taxpayer are accounted for in an annual tax return.
With a C residence permit or Swiss passport, the tax return is mandatory. Foreign employees are also automatically assessed retroactively, for example, if their annual gross income exceeds CHF 120’000 or if they have additional income such as dividends.
Anyone who is subject to withholding tax in Switzerland and exceeds certain income limits can have it checked whether a change to ordinary assessment makes sense.
This also applies to people who have assets or significant deductions.
The switch can be particularly worthwhile if you have high professional expenses, alimony payments or assets that are not sufficiently taken into account in the context of withholding tax (switching to the tax return is mandatory anyway from a certain level of assets).
First, we use your personal financial data to check whether the change is worthwhile for you.
Then an application for a retrospective ordinary assessment (NOV) must be submitted to your canton of residence. This application must be submitted by 31.03.XX at the latest. You will then receive the document from the tax office with the submission code after a few weeks/months.
Once changed, this method remains in place for the respective tax year as well as for all subsequent years. It is therefore advisable to carry out a detailed analysis in advance in order to make the best decision.