Key tax dates for your diary

What is the most important date in the tax year to remember? 5 April to ensure you finish the tax year as efficiently as possible? 31 January to make sure your tax return is submitted and all tax is paid on time?

It’s important not to miss the key tax deadlines throughout the year to avoid penalties and interest, so here’s a reminder of some of the key dates you need to keep in mind. Most of the dates will be the same every year so don’t forget to update your diary!




Deadline for submission of tax return for 2016/17 by internet filing if a tax underpayment of up to £3,000 is to be collected via your 2018/19 PAYE code




Deadline for submission of tax return for 2016/17 by internet filing, with a £100 penalty for failure

All tax due for 2016/17 to be paid by this date.

If you are liable to make payments on account under self assessment, the first payment on account for 2017/18 is due by this date




If your 2015/16 tax return (due by 31 January 2017) has still not been filed, an additional penalty of £300 or 5% of the tax due, whichever is higher, is payable for the delayed submission of the tax return.. In serious cases penalties up to 100% of the tax due may be levied




Any tax due for 2016/17 not paid by this date will be subject to a 5% penalty (in addition to an interest charge)*




Tax returns for the 2017/18 tax year are issued. This may simply be a notice that informs you of your obligation to complete a tax return




A £10 penalty for each day after 30 April 2018 up to a 90 day maximum of £900 for the delayed submission of tax returns for 2016/17




Deadline for employers to provide employees with a form P60 for 2017/18 (year-end summary of pay and deductions)




Deadline for employers to provide employees with a form P11D for 2017/18 (details of expense payments and benefits)




If you are liable to make payments on account under self assessment, the second payment on account of income tax for 2017/18 is due




A £300 penalty or 5% of the tax due, whichever is higher, is payable for the delayed submission of tax returns for 2016/17

Any tax for 2016/17 not paid by this date will be subject to a 5% penalty (in addition to an interest charge)




Deadline for submission of paper tax return for 2017/18 with a £100 penalty for failure



* Note this date may change if there is a leap year as it falls 30 days after 31 January each year

If you would like to find out more, or if you think you need help in meeting your tax filing and payment obligations, you can contact EY’s Personal Tax Centre at
.