A Revenue spokesman said today that of the 9.088m forms issued, 7.888m or 87% of returns were received by 31 January.
However, a new move by the Revenue effectively extended the deadline to 7.30am on February 2.
By the end of February 1, 8.143m or 89.6% had been received.
A further 68,000 were dropped in overnight and so were deemed to be liable for the £100 late filing penalty.
In total, this means 8.2m were filed without penalties which meant 90.2% of returns were submitted in time.
The Revenue said it was hoping for a 90% success rate and so was ‘delighted’ at the figures.
For the first two years of self-assessment, around 650,000 missed the deadline.
This year 877,000 missed it, meaning that potentially the Revenue could collect over £80m in penalties.
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