HM Revenues & Customs (HMRC) has said that anyone whose Self Assessment return is more than three months late will now be charged a further £10 penalty for each day it remains outstanding, up to a maximum of 90 days.
This means people who file their 2010/11 return online on or after 1 May will be liable to daily penalties, as the deadline for these was 31 January.
Daily penalties for paper returns began on 1 February, as paper returns were due by the earlier deadline of 31 October.
Looking ahead, further penalties of at least £300 - or 5% of the tax due, whichever is more - will be issued for returns that are six and 12 months late.
Anyone who's received a late-filing penalty, hasn't yet sent a return, but thinks they don't need to be in Self Assessment, should call HMRC on 0845 900 0444.
If HMRC agrees, the return and any penalty will be cancelled.
"We want the returns and not penalties," said Stephen Banyard of HMRC.
"So, if you haven't sent us your 2010/11 return, you need to do one of two things urgently - either send it online by 30 April, or call us if you think you shouldn't have to complete one."
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