Deadline note: Belastingdienst says your return must be in by the date on your invitation letter, and often this is 1 May. For the 2025 return filed in 2026, this is typically 1 May 2026 — always verify against your own letter and any granted extension.
Official sources: Belastingdienst — “Wanneer moet mijn aangifte binnen zijn?” and KVK — income tax for entrepreneurs (updated Feb 2026).
For preparation and “what you need” lists, Belastingdienst also provides: data checklist for the 2025 return and an entrepreneur 6-check checklist.
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Your personalised checklist
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Need help?
If you want a quick “tax filing readiness” review (what applies to you + what to gather), book a call.