January 31 2014.

HMRC hasn't extended the Self Assessment deadline. Tax returns and any tax due must be received by HMRC by midnight tonight, the 31st of January.

If someone has registered for the HMRC Online Service, or existing customers have lost their User ID or password and realise they have left it too late, HMRC will allow a bit of extra time for this information to be received. This only applies to taxpayers who did the following between midnight on 21 January and midnight on 31 January 2014:

Enrolled for the Self Assessment online service, or requested a replacement user ID or password

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