If you haven’t received a notice from HMRC to complete a self-assessment tax return for 2013/14, but you think owe income tax, Class 4 NI or Capital Gains Tax for that year, you have until 5 October 2014 to tell HMRC about it.
If you miss the deadline HMRC can fine you an amount equal to any tax paid late as a consequence.
You should tell HMRC that you think you owe tax for 2013/14 by letter. You don’t need to say how much you think is payable, just that you believe you will owe some. It is then up to HMRC to tell you that a tax return is required. You’ll then have until 31 January 2015 or three months from the date HMRC told you that a return was required, whichever is later, to submit the tax return and pay what’s due.
If you miss the deadline you can still avoid a penalty by asking us to work out how much tax you owe and by you paying it to HMRC by 31 January 2015 at the latest.
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