| 5 April 2014 | Income tax self assessment | Last day of the 2013/2014 tax year |
| Pensions | Deadline to make a contribution to qualify for tax relief in 2013/14 | |
| 6 April 2014 | PAYE | RTI late filing penalties due to start in April are postponed to October 2014 |
| PAYE | RTI late payment penalties due to start in April are postponed to April 2015 | |
| 19 April 2014 | PAYE | Last day for filing a final submission under RTI for2013/14 |
| 22 April 2014 | PAYE | Electronic payments of tax and Class 1 NICs for 2013/14 should reach HMRC to avoid an automatic interest charge |
| 30 April 2014 | Income tax self assessment | Additional late filing penalties apply to outstanding 2012/13 income tax self assessment tax returns – automatic £10 daily penalties apply |
| Corporation tax self assessment | Deadline for filing the corporation tax return with HMRC for accounting periods ended 30 April 2013 | |
| Accounts | Deadline for filing accounts with a financial year end of 31 July 2013 with Companies House. |
