Tax calculators are only useful if your inputs are clean.
Most expats get wrong answers because they compare cantons with mismatched assumptions.
15-minute calculator workflow
Step 1: Define profile inputs
- Gross salary
- Marital status and children
- Municipality/canton
- Pension and 3a assumptions
Step 2: Run these tools in sequence
Step 3: Stress-test your scenario
Run a second model where rent is 10-15% higher and bonus is zero.
If your plan still works, your relocation model is resilient.
Common model errors
- Comparing different household profiles across cantons
- Forgetting annual updates in deduction logic
- Ignoring first-year one-off costs while optimizing annual tax only
Frequently Asked Questions
Which input causes the biggest calculator error?
Wrong municipality or household profile.
Should I include bonus in my planning model?
Include it as upside, not baseline. Build your budget around fixed compensation.
Is low-tax canton always best for expats?
Not always. Housing and commute can offset tax gains quickly.
How often should I re-run my tax scenario?
At least once per year, and again when salary, canton, or family status changes.