The pre-filled tax return — how to check and what to add?
Tax Office auto-fills: payroll, bank, mortgage, AOW. Deductions + box 3 + side income are your check — most errors there.
The pre-filled return (VIA, online from 1 March) contains by default: (a) payroll from employer/benefit body; (b) Box 3 assets per 1 January (banks, investment accounts automatic); (c) Mortgage data (interest + WOZ); (d) AOW + pension; (e) Tax credit table. WHAT MISSING: (1) Deductions like donations, periodic church, alimony paid, medical above threshold; (2) Side income as freelancer, marketplace sales > threshold; (3) Foreign income (overseas real estate, dividend); (4) Gifts and inheritances (separate return); (5) Undisclosed bank accounts (increasingly auto-reported via EU CRS); (6) Mortgage cancellation or early repayment in current year. Return deadline: 1 May year after, can extend to 1 September on request. Key: AGREEING to VIA = you sign that all is correct. On post-audit increase YOU are responsible, not the Tax Office.