Self-assessment tax returns for 2009/10 must be filed online by midnight on 31 January 2011. Returns filed late attract a £100 late filing penalty.
Anyone who has yet to register to file online is urged to do so without delay. This can be done on the HMRC website. An activation code is needed before the service can be used. This is normally received by post within seven days.
Users who have used the service before should check that they have their User ID and password as it can take up to seven working days to obtain replacements.
Guidance on self-assessment can be found on the HMRC website.