HMRC will close the self-assessment telephone helpline for three months from Monday (12 June 2023).
Taxpayers hoping to contact HMRC for help with their self-assessment will now have to use digital services until 4 September 2023.
During this time, HMRC says it will trial prioritising online guidance, digital assistance and web chat.
According to HMRC, the self-assessment helpline has 50% less demand over the summer, even though around 5 million calls are made to the number every year.
Between June and August 2022, nearly 1.2m people called the helpline, with over 900,000 staying on the line to try and reach an agent, with the remainder deciding not to wait on hold.
HMRC says the move will free up 350 advisers who will be able to take on ‘more urgent' calls on other lines.
Adam Harper, director of professional standards and policy at the Association of Accounting Technicians, said:
"This pilot raises significant concerns about the impact it will have on taxpayers, particularly those who are digitally excluded or who cannot currently access the service they require via digital platforms."
Harper added that the move will leave taxpayers who are due to make payment on 31 July "with no means of contacting HMRC on the phone to deal with any queries".
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