The tax man has given those with a 2008-09 Self-Assessment tax return to complete a friendly nudge.
With the 31 October deadline for paper returns now passed, HM Revenue & Customs (HMRC) has reminded people their return must now be filed online by the deadline of 31 January.
Anyone that submits a paper return after 31 October, or files online after 31 January, could receive a £100 penalty.
First-time Self-Assessment filers and those new to filing online have been told they first need to register for HMRC's Self-Assessment Online service on the HMRC website.
Once registered, an Activation Code is sent in the post which may take up to seven days to arrive, making it advisable to register as soon as possible.
When filing online, an individual's tax is calculated automatically and an online acknowledgement is received once filed.
It is also processed faster, so any money owing to the individual is repaid more quickly.
"If you haven't yet sent us your 2008-09 tax return, don't forget, it must be sent online before 31 January," said HMRC's Sarah Walker. "And if you haven't filed online before, make sure you allow plenty of time to complete the registration process. That way, you'll avoid a last-minute rush at the end of January."
31 January 2010 is also the deadline for paying any tax owed for the 2008-09 tax year.
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