The tax year in which you move to or from the Netherlands is often more complicated than a normal resident year because residence, foreign income and treaty allocation can change during the year.
Expect a migration-year return
If you were not Dutch tax resident for the whole calendar year, the return asks additional questions about the period before/after migration and foreign income. Use the migration-year route shown in Mijn Belastingdienst rather than forcing your situation into a normal full-year assumption.
Keep evidence from both countries
- Final payslips and annual statements from your previous country.
- Dutch jaaropgaaf and employment records.
- Move/registration dates and housing documents.
- Foreign bank/investment/property records where relevant.
- Tax already paid abroad and any foreign tax assessments.
- Information about a spouse/fiscal partner where relevant.
Tax treaty does not mean “do not report”
Tax treaties help allocate taxing rights and prevent double taxation. They do not create a universal rule that foreign income or property can be omitted from a Dutch return. Report items as the form requires and let the treaty relief be applied correctly.
Fiscal partner
Dutch fiscal partnership is rule-based. Marriage/registered partnership normally creates fiscal partnership, while unmarried cohabitants can qualify through specified conditions such as a notarial cohabitation contract, a joint child, pension-partner registration or jointly owning the home they live in. Being roommates or partners socially is not enough on its own.
Where you are fiscal partners for the whole year, some shared income and deductions can be allocated between partners in the return. The best allocation depends on the actual facts and tax year.