Some one-off costs linked to your mortgage are usually deductible in the year you buy, including mortgage advice and arrangement fees (advies- en bemiddelingskosten), the valuation report (taxatierapport), the NHG premium and the notary’s mortgage deed (hypotheekakte). Costs of buying the property itself, such as transfer tax (overdrachtsbelasting) and the buying agent, are generally not deductible. Keep all invoices for your tax return.