What is box 1 and box 3 for homeowners?

For homeowners, your main residence and its mortgage fall in box 1, where the eigenwoningforfait and mortgage interest deduction (hypotheekrenteaftrek) apply. A second home, rental property or savings usually fall in box 3, which taxes assets rather than allowing interest deduction. Knowing which box applies matters for buy-to-let and for foreign property.

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