Tax Declaration for Self-Employed: Complete Guide 2026
As a self-employed person in Switzerland, your tax return is more complex than that of a salaried employee. You must declare your business income, but also manage your provisional installments, maximize your deductions and anticipate your tax burden. This guide details each step to fill out your declaration correctly and pay the right amount of taxes — with canton-by-canton figures, a concrete worked example and a complete deductions checklist.
For VAT-related procedures, complement this guide with our practical VAT declaration guide and the 2026 Swiss VAT rates. To pick a tool, see our Swiss accounting software guide.
Canton-by-canton tax estimates (single self-employed person)
Here is an estimate of the total annual tax burden (direct federal tax + cantonal + communal) for a single self-employed person in the main Swiss cities, across three turnover levels, assuming average professional deductions (~20%) and maximum pillar 3a contribution.
| Canton (city) | Turnover CHF 100k | Turnover CHF 150k | Turnover CHF 200k |
|---|---|---|---|
| Geneva | ~CHF 18,000 | ~CHF 35,000 | ~CHF 55,000 |
| Vaud (Lausanne) | ~CHF 15,000 | ~CHF 30,000 | ~CHF 48,000 |
| Zurich | ~CHF 14,000 | ~CHF 28,000 | ~CHF 46,000 |
| Zug | ~CHF 8,000 | ~CHF 16,000 | ~CHF 28,000 |
| Bern | ~CHF 16,000 | ~CHF 32,000 | ~CHF 52,000 |
Important: these figures are indicative estimates. Actual taxation depends on your personal situation (single / married / children), your actual deductions (pillar 3a, real professional expenses, LPP buybacks, childcare, medical costs) and the tax multiplier of your municipality. Always use your cantonal tax office's official calculator or the Swiss Federal Tax Administration (FTA/ESTV) simulator for a personalized estimate. For a detailed comparison, see our Swiss cantonal taxation comparison.
Income to Declare
Self-Employment Income
The taxable income from your business is calculated as follows:
- Total turnover: all invoices issued during the fiscal year (collected or not, depending on the accounting method)
- Less: deductible expenses: all justified professional expenses
- = Net self-employment income
Important: if you operate as a sole proprietorship, this net income is directly added to your other personal income for the tax calculation. In an LLC, it is the salary you pay yourself that is taxed (plus corporate profit tax).
Other Income to Declare
- Salaries (if mixed salaried + self-employed activity)
- Investment income: bank interest, dividends, capital gains
- Real estate income: rental income, imputed rental value of housing
- Pensions and annuities: OASI, occupational pension (LPP), pillar 3a (upon withdrawal)
Deductible Expenses: Exhaustive List
Direct Professional Expenses
| Category | Examples | Condition |
|---|---|---|
| Office | Rent, electricity, internet, furniture | Professional portion only |
| Equipment | Computer, printer, software (To Bill) | Depreciation if > CHF 1,000 |
| Vehicle | Fuel, insurance, maintenance, depreciation | Professional share |
| Travel | Train, plane, parking, taxi | Business trips only |
| Training | Courses, seminars, conferences | Related to current activity |
| Insurance | Professional liability, legal protection | Professional premiums |
| Professional fees | Fiduciary, lawyer, notary | Supporting invoices |
| Marketing | Website, advertising, business cards | Fully deductible |
| Telecom | Phone, mobile internet | Professional portion (50-80%) |
| Bank fees | Account maintenance, transfers | Professional account |
Home Office
Deductible only if a room is exclusively dedicated to professional activity and you do not have an external office.
Calculation: pro rata based on surface area.
- Apartment 80 m², office 12 m² = 15%
- Annual rent CHF 24,000 --> deduction: CHF 3,600
- Charges (electricity, internet, heating) at the same pro rata
Deductible Social Contributions
- OASI/DI/APG: approximately 10.0% of net income (calculated by the compensation office, annual certificate provided)
- Pillar 3a: up to CHF 7,258 (with LPP) or CHF 36,288 (without LPP, capped at 20% of net income) in 2026
- LPP buybacks (voluntary 2nd pillar): fully deductible if you are affiliated with a pension fund
- Family allowances: employer contributions are deductible
- Loss-of-earnings insurance (self-employed APG / daily allowance): premiums deductible
Depreciation
Professional assets worth more than CHF 1,000 must be depreciated over their useful life:
| Asset Type | Annual Depreciation Rate |
|---|---|
| Office furniture | 20-25% |
| Computer equipment | 30-40% |
| Vehicle | 30-40% |
| Machinery and tools | 20-30% |
| Interior fittings | 10-20% |
Example: a computer purchased for CHF 3,000 with a depreciation rate of 40% allows you to deduct CHF 1,200 in the first year, CHF 720 in the second, etc.
Self-employed deductions checklist (2026)
Here is the shortlist of deductions not to miss on your return. For an in-depth look at business expenses, see also our tax deductions guide.
- Real professional expenses — office rent, mandate-related travel, training and further education
- Equipment depreciation — computer, furniture, professional vehicle (see rates per category above)
- Professional insurance — professional liability, legal protection, loss-of-earnings (see self-employed insurance guide)
- Pillar 3a contributions — up to CHF 7,258 (with LPP) in 2026
- Voluntary 2nd pillar / LPP buybacks — 100% deductible from taxable income
- Meal expenses — flat rate if meals taken away from home due to business trips (generally CHF 15/meal or CHF 3,200/year at federal level)
- Business vehicle — mileage at official rate (approx. CHF 0.70/km) OR pro-rata share of real costs
- Home office — share of housing costs (rent, electricity, heating, internet) pro-rated by dedicated surface
- Continuing education — courses, seminars, technical books, certifications related to your activity
- Professional SaaS subscriptions — invoicing, accounting, CRM, office suites (e.g. To Bill, Microsoft 365, Adobe)
- Fiduciary / tax advisor fees — fully deductible (see choosing a Swiss fiduciary)
Tax Calculation: DFT and SCT
Direct Federal Tax (DFT)
The DFT applies to your net income after deductions, with a progressive scale:
| Taxable Income | Marginal DFT Rate |
|---|---|
| Up to CHF 31,600 | 0% |
| CHF 31,600 - 41,400 | 0.77% |
| CHF 41,400 - 55,200 | 0.88 - 2.64% |
| CHF 55,200 - 72,500 | 2.97% |
| CHF 72,500 - 78,100 | 5.94% |
| CHF 78,100 - 103,600 | 6.60% |
| CHF 103,600 - 134,600 | 8.80% |
| CHF 134,600 - 176,000 | 11.00% |
| Over CHF 176,000 | 11.50% |
Scale for single persons. Different scale for married couples.
State and Municipal Tax (SCT)
The SCT varies considerably depending on the canton and municipality. Here is an estimate for a net income of CHF 100,000 (single person):
| Canton | Estimated SCT | Total Burden (DFT + SCT) |
|---|---|---|
| Zug | ~CHF 10,000 | ~CHF 16,000 |
| Schwyz | ~CHF 11,500 | ~CHF 17,500 |
| Nidwalden | ~CHF 12,000 | ~CHF 18,000 |
| Zurich | ~CHF 16,000 | ~CHF 22,000 |
| Bern | ~CHF 19,000 | ~CHF 25,000 |
| Vaud | ~CHF 22,000 | ~CHF 28,000 |
| Geneva | ~CHF 25,000 | ~CHF 31,000 |
Complete Example
Profile: self-employed sole proprietor, Canton of Vaud, Lausanne, single.
| Item | Amount |
|---|---|
| Turnover | CHF 150,000 |
| Professional expenses | -CHF 30,000 |
| OASI/DI/APG contributions | -CHF 12,000 |
| Pillar 3a | -CHF 7,258 |
| Taxable income | CHF 100,742 |
| DFT | ~CHF 5,800 |
| SCT (VD, Lausanne) | ~CHF 22,000 |
| Total taxes | ~CHF 27,800 |
Effective tax rate: 27.5% of taxable income.
Concrete example: Marie, consultant in Lausanne
Profile: Marie, 34, self-employed consultant in Lausanne, sole proprietorship, single, no children.
| Item | Amount |
|---|---|
| Turnover (consulting mandates) | CHF 140,000 |
| Total deductions (business costs + OASI + 3a) | -CHF 25,000 |
| Taxable income | ~CHF 115,000 |
| Estimated total tax (DFT + cantonal VD + communal Lausanne) | ~CHF 24,000 |
Marie sets aside about 25% of each receipt to a dedicated account, avoiding cash-flow surprises when tax installments arrive. She also maxes out her pillar 3a (CHF 7,258) to lower taxable income.
Step-by-step declaration procedure (2026)
Here is the full chronology to follow for a self-employed declaration without surprises.
Step 1 — Close your accounts (January-December fiscal year)
Close your accounting year on December 31. Prepare your profit and loss statement (revenues - expenses) and, if you are on double-entry bookkeeping (turnover > CHF 500,000), a balance sheet. Make sure all issued and received invoices are booked and that supporting documents (PDFs, receipts) are archived. A software tool like To Bill or equivalent makes this phase easier.
Step 2 — Fill out the self-employed annex
Each canton has a dedicated annex for self-employed activity (e.g. "Self-employment" form in Vaud, annex A in Geneva). Report your turnover, expenses by category, depreciation and net result.
Step 3 — Declare OASI with the compensation office certificate
Attach the annual certificate issued by your OASI compensation office. It lists the paid contributions (deductible) and serves as evidence for the tax office. If your income has changed significantly, adjust your OASI installments in parallel.
Step 4 — Attach the balance sheet and income statement
Upload (or attach on paper) your signed balance sheet and income statement. In most cantons, filing is now done online (VaudTax, ZHprivateTax, GeTax, etc.) with CSV import or manual entry.
Step 5 — Meet the deadline and anticipate late penalties
Watch the cantonal deadline (see the deadlines table below). Always request an extension if you cannot file on time — it is generally free. If you miss without justification: reminder (CHF 50), second reminder (CHF 100-150), then ex officio assessment (unfavorable). On amounts owed, default interest of 4 to 5% applies beyond due date.
Provisional Installments
How It Works
The tax administration sends you provisional installment notices based on your last declaration. You generally pay in 10 monthly installments (or quarterly depending on the canton).
Modifying Installments
If your income changes significantly, you can request a modification of the installments:
- Income increase: increase your installments to avoid a large catch-up payment (with default interest)
- Income decrease: request a reduction to preserve your cash flow
Interest:
- Default interest (late payment): 4 to 5% depending on the canton
- Compensatory interest (overpayment): 0 to 1% depending on the canton
Recommended Provisioning
Set aside 25 to 30% of each cash receipt for taxes and social contributions. To Bill helps you track your results in real time (turnover, expenses, profit).
Filing Deadlines by Canton
| Canton | Standard Deadline | Extension Possible |
|---|---|---|
| Geneva (GE) | March 31 | Until September 30 (upon request) |
| Vaud (VD) | February 28 | Until September 30 (if fiduciary) |
| Zurich (ZH) | March 31 | Until September 30 (upon request) |
| Bern (BE) | March 15 | Until September 15 (upon request) |
| Fribourg (FR) | March 31 | Until September 30 (upon request) |
| Valais (VS) | March 31 | Until November 30 (upon request) |
| Neuchatel (NE) | February 28 | Until June 30 (upon request) |
| Jura (JU) | March 31 | Until September 30 (upon request) |
Late penalties:
- First reminder: free to CHF 50
- Second reminder: CHF 50 to 150
- Ex officio assessment: if no declaration is filed, the tax authority estimates your income (often unfavorably)
Legal Tax Optimization Strategies
1. Maximize Pillar 3a
Pillar 3a is the most powerful tax lever for self-employed individuals:
- With LPP: contribute the maximum of CHF 7,258
- Without LPP: contribute up to CHF 36,288 (20% of net income)
- Savings: at a marginal rate of 35%, contributing CHF 7,000 = CHF 2,450 in tax savings
Tip: open multiple 3a accounts (max 5) to optimize staggered withdrawals at retirement.
2. Plan Your Investments Ahead
Make your professional purchases (equipment, software, training) before December 31 to deduct them from the current fiscal year.
Example: purchasing a computer for CHF 2,500 in December. If your marginal rate is 35%, you save CHF 875 in taxes one year earlier.
3. Smooth Your Income
The progressive scale penalizes exceptional years. If possible:
- Spread the invoicing of large projects over two fiscal years
- Postpone certain services if your turnover is already high
- Anticipate expenses at year-end
4. LPP Buybacks (if LLC)
If you are affiliated with a pension fund, LPP buybacks are fully deductible. This is particularly effective for high incomes.
5. Choose the Right Canton
The difference in tax burden can reach 20% of income between the most and least expensive cantons. If you are considering a move, run a comparative simulation.
6. Switch to LLC if Relevant
From approximately CHF 150,000 in net income, LLC taxation can become more advantageous thanks to the salary/dividend split. Consult your fiduciary for a personalized simulation.
Documents to Prepare for Your Declaration
Mandatory
- Income statement: summary of income and expenses for the fiscal year
- Balance sheet (if double-entry bookkeeping): statement of assets and liabilities as of December 31
- OASI certificate: amount of contributions paid
- Pillar 3a certificate: amount contributed during the year
- Bank statements: all professional and personal accounts
- LPP certificate: pension assets and buybacks made
Supporting Documents to Keep (10 years)
- All invoices issued and received
- Payment receipts
- Contracts and purchase orders
- Expense reports with supporting documents
- Vehicle logbook (if claiming mileage deduction)
Prepare Your Declaration with To Bill
Automated Export
To Bill automatically generates the documents needed for your declaration:
- Annual turnover: all invoices issued, sorted by month
- Expenses by category: expenses classified according to the SME chart of accounts
- VAT summary: VAT collected and deductible by quarter
- PDF supporting documents: all accounting documents stored and accessible
- Fiduciary export: compatible format CSV, Excel, API
Real-Time Tracking
- Track your monthly and cumulative results (turnover, expenses, profit)
- Keep all your PDF supporting documents centralized
- Provision with confidence thanks to a clear view of your activity
Result: prepare your tax return with all your figures and supporting documents already gathered, without missing any deduction.
Simplify my declaration with To Bill ->
FAQ: self-employed tax declaration
How to declare advance payments received at year-end?
Client advance payments collected in December for services delivered the following year must be booked as a deferred income (balance sheet liability). The corresponding tax revenue is recognized in the year of actual delivery, not the year of receipt (accrual principle). Under cash accounting (small self-employed), they are taxed in the year of payment.
First self-employed declaration: what to watch for
For your first year, prepare: (1) an opening balance sheet listing your assets and liabilities as of January 1; (2) confirmed OASI affiliation from your compensation office; (3) clean bookkeeping from day one (even if simple). Also anticipate that the tax office will send provisional installments based on an estimate — do not hesitate to adjust them.
What is the 2026 deadline to declare?
Deadlines vary by canton (see table above): February 28 in Vaud, March 31 in Geneva / Zurich / Fribourg, March 15 in Bern. An extension can be requested online, generally until September 30 (up to November 30 in Valais).
What are the penalties for late filing?
Standard sequence: (1) first reminder (CHF 0 to 50 depending on canton); (2) second reminder (CHF 50-150); (3) penalty fine (up to CHF 1,000); (4) ex officio taxation if no return is filed, with unfavorable income estimation. On amounts owed, default interest of 4 to 5%/year.
Can I deduct my SaaS subscriptions (To Bill, Microsoft 365, etc.)?
Yes, subscriptions to professional software (invoicing, accounting, CRM, office suites, industry-specific tools) are fully deductible as operating expenses. Keep annual invoices or monthly receipts as supporting documents.
How to handle revenue versus invoices issued?
Two methods: cash accounting (actual receipts, allowed if turnover < CHF 500,000) or accrual accounting (invoice date, mandatory above). Choose one and stick with it — switching requires tax office approval. Accrual accounting is preferred by fiduciaries because it better reflects economic performance.
Flat-rate deductions vs real expenses: which to choose?
Some cantons accept a flat-rate professional deduction (e.g. 20% of turnover, capped) to simplify. This is only favorable if your real expenses are lower than the flat rate. Compare both before deciding — and always document your expenses, the tax office can review over 10 years.
LLC (Sàrl/GmbH): double taxation explained
With an LLC or corporation, the company first pays corporate profit tax (~14-21% depending on canton). Then the dividend paid to the partner is taxed again in personal income (with reduced taxation for qualified participation of ≥ 10%, typically 50-70% privileged). Total tax can still be more favorable than a sole proprietorship above ~CHF 150,000 net income, thanks to the salary/dividend split.
Withholding tax for a foreign self-employed resident?
A foreign resident self-employed (B, C, L permit) is taxed under the ordinary regime on self-employment income, not at source (withholding applies to salaried employees). If you combine salaried and self-employed activity with a B permit, you are subject to withholding on the salary and to a subsequent ordinary taxation if total income exceeds CHF 120,000.
Changing canton mid-year: how does it work?
You are taxed in the canton of domicile on December 31 of the fiscal year for the entire year (uniqueness principle). Exception: real-estate income and certain specific items can be apportioned. Notify the old and new resident registration offices of your move; the information flows to the tax authorities. If you are considering a fiscally advantageous move, compare cantons: see our cantonal comparison.
Do I have to charge VAT as self-employed?
Yes, as soon as your annual turnover exceeds CHF 100,000, you must register for VAT. See our 2026 Swiss VAT rates guide and the practical VAT declaration guide to pick the right accounting method.
Can I deduct charitable donations?
Yes — donations to recognized Swiss public-interest institutions are deductible up to 20% of net income at federal level (and generally at cantonal level) upon submission of supporting documents. Make sure the organization appears on your canton's official list.
How to declare a vehicle used for mixed purposes?
Keep a mileage logbook with date, purpose, destination and km. You can deduct the professional share using one of two methods: (a) per km (rate of CHF 0.70/km generally) or (b) pro-rata of real costs (fuel, maintenance, depreciation, insurance) based on the ratio of business km to total km.
Useful links and official sources
- Swiss Federal Tax Administration (FTA / ESTV) — official texts, calculators, circulars
- Geneva Cantonal Tax Administration — GeTax, rates, GE deadlines
- Canton of Vaud — taxes — VaudTax, VD extensions
- Canton of Zurich — taxes — ZHprivateTax, ZH rates
- Canton of Bern — taxes — TaxMe, BE deadlines
- Canton of Zug — tax administration — ZG tax regime