Brussels, 29 October, (Brussels Morning Newspaper) – A Belgium tax agency cyberattack has disrupted government digital services, forcing the temporary shutdown of the MyMinfin online tax portal and several other platforms. Belgium’s Federal Public Service Finance (FPS Finance) confirmed the incident on Wednesday, 28 October, saying technical teams were investigating the attack and working to protect government systems.
The disruption has raised concerns among taxpayers and businesses approaching important filing deadlines. Authorities have promised additional time for affected tax declarations but have not yet announced a revised deadline.
Belgium Tax Agency Cyberattack Forces Portal Closure
FPS Finance said MyMinfin and several other digital services had been made temporarily inaccessible as a precaution.
The online portal enables Belgian residents and businesses to access tax documents, manage financial information and complete administrative procedures.
Officials explained that restricting access would help limit potential risks while specialists assessed the incident and carried out security work.
The department confirmed that many other government applications remained available, either fully or with reduced functionality.
The authorities have not publicly identified those responsible for the attack or disclosed the method used to target their systems.
Belgian Finance Ministry Reports No Evidence of Data Theft
In its official statement published on 28 October, FPS Finance said there was currently no indication that personal information had been leaked or stolen.
However, the department stressed that its investigation into possible data exposure was continuing.
The ministry said in its official French-language statement, translated into English:
“Data protection is a priority for FPS Finance.”
It also confirmed that officials were closely monitoring the situation and working to restore affected services as quickly as possible.
The statement does not establish that a data breach has been definitively ruled out. Further technical examination is required to determine the full consequences of the incident.
Cyberattack Disrupts October Tax Filing Deadlines
The attack comes shortly before the 31 October deadline for certain Belgian income tax declarations.
The affected deadline covers returns involving specific categories of income, making access to online filing services particularly important for some taxpayers and their accountants.
FPS Finance has confirmed that sufficient additional time will be granted for the relevant declarations.
The revised submission date will be communicated once authorities have established the necessary arrangements.
Why the Cyberattack Matters for Belgium
Belgium’s federal finance administration handles important taxation and financial procedures, making its digital infrastructure essential for residents, businesses and professional advisers.
MyMinfin provides centralised access to tax-related services, reducing the need for paper-based administrative processes.
Interruptions can therefore delay the preparation and submission of returns, particularly when taxpayers need access to documents held within government systems.
The incident also highlights the importance of cybersecurity safeguards for public institutions managing sensitive financial information.
Although officials have reported no evidence of stolen data, the disruption demonstrates how an attack can affect public services even before investigators establish whether information has been compromised.
What Happens Next for Belgian Taxpayers?
FPS Finance is continuing its technical investigation and efforts to restore the affected online services.
Authorities are expected to provide further information about system availability and the revised filing deadline for declarations involving specific income.
No confirmed timetable for the complete restoration of affected services was included in the ministry’s initial announcement.
Taxpayers and businesses should monitor official communications from FPS Finance for updated deadlines and service information.
The investigation will also determine whether additional security measures or public notifications are necessary.
For now, the government’s immediate priorities remain securing its digital infrastructure, restoring access and ensuring that affected taxpayers receive sufficient time to meet their obligations.
Sources: Belgian Federal Public Service Finance, official cybersecurity incident statement, 28 October 2026; Reuters, 28 October 2026; The Brussels Times, 28 October 2026.
