Year-end tax optimization — Canton St. Gallen
A canton-specific rundown of the deductions, contributions, and timing moves that can lower your tax bill before the tax year 2026 closes.
SG
Canton code
×1.15
Cantonal multiplier
Estimated canton/commune multiplier vs. federal tax — approximate only.
12
Applicable rules
0
Canton-specific particularities
St. Gallen: how much should you set aside?
Enter your revenue and expenses: the calculator applies St. Gallen's multiplier and shows what to park each month for AVS and income tax.
Home office deduction
No fixed cap
If you work from home regularly and have a dedicated workspace, you can deduct a share of rent/mortgage interest, utilities, and insurance proportional to the office area.
Professional tools and training
No fixed cap
Deduct software subscriptions, hardware, books, courses, and conference fees directly tied to your business activity.
Vehicle / travel expenses
No fixed cap
Deduct business travel at CHF 0.70/km (car) or actual public transport costs. Keep a logbook for mixed-use vehicles.
Meal deduction (away from home)
No fixed cap
When working at a client site or traveling for business, deduct CHF 15/meal for lunch and CHF 27.50 for dinner.
Health insurance premium deduction
No fixed cap
Health and accident insurance premiums are deductible up to a canton-specific cap for self-employed persons.
Interest on business loans
No fixed cap
Interest paid on loans used exclusively for business purposes (equipment, working capital) is fully deductible.
Applies from CHF 50’000 revenue
Pillar 3a buy-in for a missed year (new)
Max: CHF 7’258
2026 is the first year you can buy back a Pillar 3a gap (2025). Pay the full 2026 contribution first, then buy in up to CHF 7'258 extra — both fully deductible. Requires a written application to your 3a foundation.
Pillar 3a contribution (with 2nd pillar)
Max: CHF 7’258
Contribute the maximum to your Pillar 3a account before Dec 31. This amount is fully deductible from taxable income.
Pillar 3a contribution (without 2nd pillar)
Max: CHF 36’288
As a self-employed person without a 2nd pillar, you can contribute up to 20% of net income (capped). This is the single most impactful deduction.
Pay provisional AHV before year-end
No fixed cap
AHV/IV/EO contributions paid in the current year are deductible for that year. Ensure your provisional contributions are paid before Dec 31.
Immediate asset write-off
Max: CHF 1’000
Assets under CHF 1,000 can typically be expensed immediately. For larger items, use declining-balance depreciation (often 25-40% per year depending on asset class).
VAT method optimization
No fixed cap
If your expenses are below ~40% of revenue, the flat-rate method (taux de dette fiscale nette) often saves money vs. effective method. Review annually.
Requires VAT registration
Official figures and deadlines — Canton St. Gallen
Tax multiplier (canton and capital)
The cantonal Steuerfuss is 105%, unchanged since 2023 and planned to hold through 2029. The City of St. Gallen charges 138%, after a motion to cut it was rejected.
Tax return filing deadline
The filing deadline is 31 March. It is an administrative deadline set at communal level — we could confirm it on the municipal tax office page rather than on the cantonal site.
Deadline extension
An extension is free and can be requested electronically; if you ask in time and your tax bills are paid, you have a legal right to it. The latest possible end date is not published — official sources contradict each other, so ask your Gemeindesteueramt.
What is specific to St. Gallen for the self-employed
Particularity 1
Childcare is deductible up to CHF 25'000 per child, and St. Gallen explicitly allows it for time spent on self-employed work, not only for employment. The cap was CHF 7'500 before 2019.
Particularity 2
Insurance premiums are capped at CHF 6'800 married and CHF 3'400 single, plus CHF 1'100 per child, with a further CHF 1'100 or CHF 500 if you have neither a 2nd pillar nor a 3a. Insurance taken out for the business is a business expense and sits outside that cap. Figures are for the 2025 tax year.
Particularity 3
A home office is only deductible if three conditions are met at the same time, and the flat rate cannot be combined with actual costs — you choose one or the other.
Official sources
Facts verified against official sources on 2026-07-29. Not tax advice — confirm with your trustee or the cantonal tax office.
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Estimates only, not tax advice. The cantonal multiplier and deduction caps shown are approximate — confirm figures with your trustee or cantonal tax office before filing.