Interest and penalties on late paid tax under Self Assessment

By Tolley
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The following Personal Tax guidance note by Tolley provides comprehensive and up to date tax information covering:

  • Interest and penalties on late paid tax under Self Assessment
  • Interest
  • Penalties for late paid tax
  • Surcharges for the 2009/10 tax year and previous years

Interest

If the capital gains tax, the balancing payment or payments on account of tax and / or Class 4 national insurance contributions (NIC) are paid late, HMRC will charge interest on the amount overdue from the original due date. The due date for the balancing payment of tax is usually 31 January after the end of the tax year and the due dates for the payments on account are 31 January before the end of the tax year and 31 July next. See the Payment of tax and Self assessment ― payments on account guidance notes for further information.

FA 2009, s 101

Interest runs from the normal due date for payment to the day before payment is actually received by HMRC.

FA 2009, s 101(3), (4)

From 2015/16, interest is also charged on any late paid Class 2 NIC, with the normal due date being 31 January after the end of the tax year.

SSCBA 1992, s 11A(1)(c)

HMRC charges interest at an annual rate which can be found by adding 2.5% to the Bank of England base rate. As the interest figure is calculated on a daily basis, the annual rate is multiplied by the number of days in the period divided by the number of days in the year to give the adjusted figure.

SI 1989/1297, reg 1, 3

The interest figure is cal

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