Moving In Together or Getting Married: Tax and Benefits

When you become fiscal partners, what you can split between you, and why your benefits may change once your incomes are combined.

← Tax GuideLife events4 min readUpdated 30 Sept 2026
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When you become fiscal partners

Married couples and registered partners are fiscal partners from the wedding date. Unmarried couples living at the same address are fiscal partners if, for example, they have a notarial cohabitation agreement, a child together, own their home together or are registered as each other's pension partner.

ToolCheck what you can claimEight questions, then every allowance and benefit for your household, with amounts.

What you can gain

  • Divide deductions such as mortgage interest and gifts to charity in the most favourable way.
  • Divide your joint Box 3 wealth, and use a double tax-free allowance.
  • Transfer the general tax credit to a partner without income only in limited cases (for partners born before 1963).

What can cost you

Benefits (toeslagen) are based on your combined income once you are partners. Healthcare and rent allowance often drop or stop. Update Mijn toeslagen from the date you started living together.

Sources

This article is based on these official pages. If anything here differs from them, the official page is right.

Ready to run your own numbers?

Compare filing alone and jointly
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