Belgium: Tax compliance deadlines extended following cyberattack
Extension applies to several filing and notification obligations with deadlines that had not expired as of October 28, 2026.
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The Belgian tax administration has announced an extension to November 16, 2026, for several tax compliance deadlines following a cyberattack that affected its digital services. As a precautionary measure, MyMinfin and several other services were temporarily made unavailable to protect the security of the systems.
The extension applies to returns with filing deadlines that had not yet expired on October 28, 2026, the date of the cyberattack. It also applies to returns for which an individual filing deadline had previously been granted.
The requirements covered by the extension include:
- Individual (personal) income tax returns relating to specific types of income
- Corporate income tax returns for companies with financial years ending March 31, 2026
- Pillar Two returns, notifications, and information returns
- DAC6/mandatory disclosure rules (MDR) and country-by-country (CbC) filings
- Withholding tax returns
- Returns relating to miscellaneous taxes
- Notifications relating to the anti-abuse provisions concerning the annual tax on securities accounts
Certain affected filings, including Pillar Two returns and notifications, had previously been extended to October 31, 2026.
Read an October 2026 report prepared by the KPMG member firm in Belgium