New HMRC August deadline passed - taxpayers given 'act now' alertThe first quarterly update deadline has passedView 2 Images The first Making Tax Digital quarterly update deadline was August 7 (Image: SrdjanPav via Getty Images)Two groups of taxpayers have been warned they cannot afford to ignore a major new HMRC tax regime after a key deadline passed last week. It said: “Missed the Making Tax Digital quarterly update deadline? HMRC says around 864,000 people were in the first group required to start using Making Tax Digital from April 2026. The next quarterly deadline is November 7. From April 6, 2027, the rules will be extended to sole traders and landlords with qualifying income above £30,000.