Self-employed workers and landlords earning more than £50,000 annually will be subject to fines of up to £900 if they fail to meet new quarterly tax reporting deadlines, under sweeping reforms set to take effect from April 2026.
The overhaul, part of HM Revenue and Customs’ Making Tax Digital (MTD) programme, will replace the traditional single annual self-assessment return with a system requiring taxpayers to submit income updates every three months.
According to research by industry event organiser Accountex, the shift is set to challenge the accountancy profession significantly. Four out of five accountants surveyed said MTD would be their biggest professional hurdle in the year ahead. A third admitted they felt unprepared for the change, while one in ten said they were “severely underprepared”.
Robert Jones, proprietor of Swift Tax Refunds, warned that the first reporting window — from 6 April to 5 July 2026 — must be filed by 7 August, leaving taxpayers little room for error.
“Failing to file a return on time results in an immediate £100 fine,” Jones explained. “If the return remains outstanding after three months, daily penalties of £10 begin to accumulate, potentially reaching £900.”
If a submission is still late after six months, HMRC will impose an additional penalty of £300 or 5% of the outstanding tax — whichever is greater. This same penalty will be applied again if the delay extends to 12 months.
More severe sanctions will apply for deliberate non-compliance. In addition, late payment of tax will incur separate charges: 5% of the unpaid sum after one, six, and twelve months, plus daily interest from the original due date.
The changes will require self-employed individuals and landlords to maintain accurate, up-to-date financial records throughout the year, rather than focusing on the traditional January deadline.
Those with multiple income streams, such as a combination of freelance work and rental properties, will face added complexity, as separate quarterly returns must be filed for each source of income.
“This is a big behavioural change,” Jones said. “People will need to be much more disciplined with record-keeping if they want to avoid costly mistakes.”
With the clock ticking towards the April 2026 rollout, industry experts are urging taxpayers to start preparing early to avoid fines and disruption when the new rules take effect.
