HMRC has issued a stark warning to UK households and businesses that relying on artificial intelligence summaries for VAT deadlines could result in financial penalties. The tax authority explicitly stated that some AI platforms incorrectly suggest that VAT payments due on weekends can be deferred to the next working day, which is not the case.
AI Misinformation Leads to Late Filing Risks
In a post on X (formerly Twitter), HMRC cautioned: “Some AI platforms claim weekend VAT deadlines can be paid on the next working day. This is incorrect.” The agency reinforced that “the VAT deadlines remain one month and seven days after your VAT period.” This clarification comes as the Low Incomes Tax Reform Group (LITRG) highlighted a growing trend of late submissions linked to reliance on third-party websites and AI tools.
Statutory Deadlines Are Fixed
According to official guidance on Gov.UK, “If you’re registered for VAT, you must submit a VAT Return even if you have no VAT to pay or reclaim.” The deadline for online submission is “usually one calendar month and 7 days after the end of an accounting period,” which also serves as the payment deadline. HMRC stresses that taxpayers must “allow time for the payment to reach HMRC’s account” and submit returns “on or before the deadline, even if it’s on a weekend or bank holiday.”
Consequences of Late Submission
The LITRG noted: “We understand that an increasing number of businesses and agents are submitting late VAT returns where the statutory due date falls on a weekend or bank holiday. This appears linked to a possible reliance on third-party websites and AI tools which suggest HMRC allow these VAT returns to be submitted the next working day. This is incorrect.” The group emphasized that “VAT return submission deadlines are fixed in law and do not move when they fall on a weekend or bank holiday.” Submitting a VAT return late can result in late submission points or penalties.
Practical Advice for Taxpayers
HMRC confirmed that VAT returns can be submitted on weekends or bank holidays. If a business cannot file on those days, it should submit by the last working day before the due date. Similarly, VAT payments must reach HMRC by the due date or the last working day before. The agency urged taxpayers to “always check official guidance” and avoid relying on unverified AI summaries.
