Key Dates
Register for Self Assessment - 5th October
Complete Paper Tax Return - 31st October
Complete Online Tax Return - 31st January
Pay Tax - 31st January
The above dates apply after the end of the tax year in which you started trading e.g. if you start your self employed business in July 2021, you will need to register by 5th October 2023.
You should note that automatic interest and penalties apply for failure to file your tax return and pay your tax on time.
Waiting to hear from HMRC or already received a tax return notice?
Whilst HMRC might send you a notice to complete a tax return, it is important to note that you should not rely on HMRC to remind or inform you. As a self-employed individual, completing tax returns in a timely manner is solely your responsibility.
That being said, if HMRC have served you a notice urging you to submit your self assessment tax return, whether or not you owe any tax, it must be completed.
You may receive a penalty if you miss the deadline to register for self assessment, submit your tax return, and/or pay your resulting tax bill.
For tax returns up to three months late, you will pay a late filing penalty of £100. Any later than three months and the penalty rises. You will also be charged interest on any late payments.
Should you wish to appeal a penalty, you can do so here.
Although the deadline is strict, if you realise you may have made a mistake whilst submitting your SATR online, you may go back and make changes up until the filing deadline for the next tax year. In other words, up to a year after the initial deadline for submission.
When submitting your SATR online, you can save your progress as you go, giving you plenty of time to think about your answers or return and correct any previous answers.
It is always recommended to complete your SATR well in advance of any deadlines, this way there is always time to fix any errors.
A payment on account is an advance payment on your next tax bill. It is a way for HMRC to ensure that you can’t benefit from paying your tax in arrears.
You will need to pay in this manner if your previous self-assessment tax bill was more than £1,000 and you didn’t pay more than 80% of your taxable income through PAYE (in employment income), so for those in full-time self-employment, this is likely to apply.
Payments on account are paid twice a year (by 31st January in addition to the balance due for the previous tax year, and by 31st July). They each equate to 50% of your previous year’s tax bill.
For example:
Your total tax bill for the 2019/20 tax year was £5,000 which was paid by 31st January 2021.
You pay your first payment on account for the 2020/21 tax year also by 31st January 2021 of £2,500 (50% of the previous year’s total bill).
You pay your second payment on account for the 2020/21 tax year of £2,500 by 31st July 2021.
Your total 2020/21 tax bill is £7,000.
By 31st January 2022, you pay the remaining balance of £2,000 plus the first payment on account for the 2021/22 tax year of £3,500.