The figure will produce almost a £100m cash windfall for the Treasury. The all-time high follows the 800,000 taxpayers missing the deadline last year.
The consistently high statistic suggests a hard core of taxpayers continually file late returns. But the Revenue said the number of repeat offenders was low, adding: ‘But a percentage were repeats.’
Official figures showed 8.9 million returns had been registered as Accountancy Age went to press.
The high figure comes despite the Revenue moving the deadline to 7.30am on 2 February.
The Revenue said it was happy with the percentage of taxpayers who had filed on time, but added: ‘We will continue to advertise deadlines and encourage self-assessment taxpayers to file on time, but the figures are remarkably similar to last year.’
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