Tax bill, permit risk, or double taxation if your tariff code is wrong.
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2
This guide
Follow the steps, checklist, and mistakes below.
Practical LIA guide
Withholding tax and TOU: understand if you need to act
Some profiles must switch to ordinary subsequent taxation, while others benefit by request.
- 📂 Taxation
- ⏱️ Read : 10 min
- 🗓️ Upd. 19/05/2026
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Detailed guide content
Concrete action plan
Follow these steps in order. Each one helps avoid an error or save a cantonal deadline.
- Check your income threshold and tax status.
- List possible deductions with supporting documents.
- Respect strict cantonal deadlines.
- Compare withholding deduction and final taxation.
- Simulate your 2026 monthly withholding with the free calculator before any TOU request.
- Archive each payslip and cantonal notice in one annual folder.
LIA can do all of this for you, automatically.
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Documents to prepare
- Salary certificate
- Third-pillar certificates
- Childcare/children expenses
- Additional income
- 2026 withholding calculator simulation
Common mistakes to avoid
- Assuming TOU is automatic
- Submitting deductions without proof
- Ignoring a received tax notice
- Comparing one month only without annual projection (TOU threshold).
Official sources to verify
All info in this guide comes from publicly verifiable sources.
ESTV - Impot a la source ↗
ESTV - Liens autorites cantonales ↗
ch.ch - Portail officiel des demarches ↗
Informations administratives officielles Confedereation/Cantons/Communes.
SEM - Secretariat d Etat aux migrations ↗
Permis, regroupement familial, naturalisation.
OFSP - Assurance maladie ↗
Regles LAMal et informations de sante publique.
Centre AVS/AI ↗
AVS, AI, allocations, prestations complementaires.
How LIA helps you on this topic
No need to read 30 pages of law: your digital secretary understands your case and acts for you.
LIA understands your situation
You explain in 2-3 sentences (or drop the letter). LIA spots the topic, canton, and urgency.
- Auto topic detection
- Cantonal adaptation
- Urgency score
LIA drafts every letter
Objection, appeal, request, formal notice: LIA prepares the right official letter — human review available as an option.
- Swiss legal templates
- Auto personalization
- Human review of sensitive letters (included)
LIA tracks your deadlines
You forget? LIA does not. She alerts you by email before every cantonal deadline — never a day late.
- Email alerts
- Secure archive 24/7
- Full export on demand
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FAQ about this guide
Is this guide enough for my case?
This guide gives structure and common mistakes. For sensitive or urgent cases, personalized support is recommended.
How often is this content updated?
Our guides are regularly updated according to federal and cantonal changes.
Are official sources included?
Yes. The official sources section links to relevant Swiss public portals.
Can I request a simplified version of this guide?
Yes. We can convert this guide into a short checklist and a simplified AI action plan.