There are many important dates in the UK tax year that all business owners should be aware of. Worried about keeping track of them all? We’re got you covered with this guide. 

For the newly incorporated companies and people who are new to self-employment, these dates and deadlines might never have been on your radar. 

Being aware of these dates is equally as important as being up to speed with the current tax rates, allowances and thresholds for the year, so be sure to make note - it could save you in the long run!

We’ve put together an accounting date timeline so you can keep track of all your deadlines (except your limited company filing deadlines, which vary based on company formation dates and other changes made) and information on what you’ll be required to do. 

Use this timeline to set up your calendar reminders and be organised with your accounting and finances.

Also, be sure to check out our super handy Tax Calendar, which you can subscribe to from your own Google calendar. To receive automated reminders on key tax dates so you can stay on top of your tax reporting and filing responsibilities.

The key dates in the UK tax year that you need to know

October 2024

5th - Deadline for Self Assessment registration to notify HMRC of Income/Capital Gains Tax

By the 5th of October you must’ve registered with HMRC for your Self Assessment following the end of the tax year. If you miss this deadline, you could receive a fine from HMRC, but you’d still be required to register as soon as possible.

We’ve got a step-by-step guide for self-employed income tax, along with a free tax calculator, to help you understand how to register with HMRC for your tax return.

31st - Deadline for postal submission of Self Assessment Tax Returns for tax year ended 5th April to be received by HMRC 

The deadline for submitting your paper tax return is the 31st of October. This is earlier than the online submission to allow HMRC enough time to process your paper Self Assessment as this is a longer process. To submit yours, you have to request a paper form from HMRC as they’re no longer automatically sent out.

November 2024

2nd - Deadline for submitting a P46 (Car) for the quarter ending the 5th of October

The deadline for when you’re required to submit your P46 depends on when you provided the company car, stopped, or changed the company car. If this was done in the quarter ending the 5th of October, then your deadline to file your P46 for these changes would be the 2nd of November.

You can find the form online on HMRC’s website.

January 2025

31st - Deadline for filing Self Assessment and Capital Gains Tax & Payment of Self Assessment Tax and first Payment on Account due

Your Self Assessment tax return and capital gains tax is required to be submitted to HMRC by the deadline of the 31st of January or you could endure a fine. Your remaining balance of tax for the previous tax year is due, and your first payment on account for income tax for the current tax year is also due.

February 2025

2nd - Deadline for submitting a P46 (Car) for the quarter ending the 5th of January

A P46 (Car) form needs to be sent to HMRC if you’ve provided a company car to employees, stopped providing a company car, or provided someone with an additional car. If this was done in the quarter up until the 5th of January, then your deadline to submit this will be the 2nd of February.

You can find the form online on HMRC’s website.

March 2025

1st - New Advisory Fuel Rates (AFR) for company car users

HMRC will publish the new AFR’s so that company car users can see the advisory fuel rates, when you can use them, and how they’re calculated.

April 2025

5th - Personal Tax Year Ends 

A tax year runs from the 5th of April to the 6th of April each year. Often a new tax year means new tax rates and regulations come in.

Our ‘get ready for the end of tax year’ article will provide you with all the information you need to prepare and maximise your tax efficiency.

6th - Personal Tax Year Begins

The new tax year always begins on the 6th of April. Being aware and prepared of any changes for the new tax year is extremely important for managing your finances and avoiding any unexpected payments.

We’ve got an in-depth article covering “Personal and business tax changes for the new tax year”  to help you get ready for any new changes in this tax year.

19th - Deadline for employers' final PAYE return (Full Payment Submission) to be submitted & automatic interest is charged where PAYE Tax, Student Loans, Class 1 NI, or CIS deductions are not paid by this day of the month 

Full Payment Submission (FPS) informs HMRC of employee’s details, pay, and deductions for the previous financial tax year. You’re required to submit these details by the deadline of the 19th of April.

May 2025

3rd - Deadline for submitting P46 for employees whose car/fuel benefits changed during the quarter to 5th April

The deadline for when you’re required to submit your P46 depends on when you provided the company car, stopped, or changed the company car. If this was done in the quarter ending the 5th of April, then your deadline to file your P46 for these changes would be the 3rd of May.

You can find the form online on HMRC’s website.

31st - Deadline for forms P60 to be issued to employees 

A P60 is a summary of your pay and deductions from a specific tax year. On the 31st of May every year your employer will automatically issue your P60 for you. If you’re self-employed you won’t obtain the P60 form as you’re not part of the PAYE scheme. But, if your business has other employees on the books, you’ll be required to issue their P60.

Not sure what a P60 is or why it’s required? Check out our “P60 form” article.

July 2025

6th - Deadline for P11D, P11D(b) and Employment Related Securities to be submitted to HMRC

The P11D form is used to report benefits in kind. These are items or services which you (or your employees) receive from your company in addition to your salary, such as private healthcare, interest-free loans (to pay for train season tickets, for example) and company cars. The deadline for this form to be submitted to HMRC is the 6th of July.

ERS schemes are a method of transferring shares to employees of the company (including directors). ERS schemes can either be tax-advantaged or non-tax advantaged. These also have to be submitted to HMRC by the 6th of July.

Discover more information on P11D forms and the ERS schemes in our Crunch articles.

31st - Second Payment on Account due 

This date is for the self-employed to make their second payment in advance towards their tax bill for the year. HMRC split this over two payments to help the self-employed keep on top of their tax bills and payments.

For further information on payment on account, you can check out our POA article covering all you need to know.

August 2025 

3rd - Deadline for submitting a P46 (Car) for the quarter ending the 5th of July

The deadline for when you’re required to submit your P46 depends on when you provided the company car, stopped, or changed the company car. If this was done in the quarter ending the 5th of July, then your deadline to file your P46 for these changes would be the 3rd of August.

You can find the form online on HMRC’s website.

{{tax-guide}}

Submission deadline for your VAT returns 2024/25

All businesses are required to submit a VAT return. The submission deadline for  your VAT return is 1 month and 7 days after the end of the VAT period. This is for both monthly and quarterly payers. For example, if you have a VAT period that ends on the 30th of October, your VAT return will be due by the 7th of December.

The deadlines are as follows:

7th of January - Deadline for VAT Returns period ending 30th November 

7th of February - Deadline for VAT Returns period ending 31st December

7th of March - Deadline for VAT Returns period ending 31st January

7th of April - Deadline for VAT Returns period ending 28th February 

7th of May - Deadline for VAT Returns period ending 31st March

7th of June -  Deadline for VAT Returns period ending 30th April

7th of July - Deadline for VAT Returns period ending 31st May

7th of August - Deadline for VAT Returns period ending 30th June

7th of September - Deadline for VAT Returns period ending 31st July 

7th of October - Deadline for VAT returns period ending 31st August 

7th of November - Deadline for VAT Returns period ending 30th September

7th of December - Deadline for VAT Returns period ending 31st October

Monthly deadlines for CIS, NICs and PAYE to HMRC

These are the monthly deadlines for payment to HMRC. For example, if your business has employees and you deduct income tax, National Insurance, student or postgraduate loans etc on a monthly basis, you’ll have until the following deadlines each month to ensure HMRC receives payments. The same rules apply for the Construction Industry Scheme.

The date of the 19th is for submission of older methods, such as cheques by post, to allow HMRC enough time to process these. But, the 22nd is the deadline for  payments that clear quickly, such as Bacs. If the deadline is not met, you could receive a fine from HMRC.

To find out more on running payroll, check out the HMRC website.

19th - Monthly deadline for postal payments of CIS, NICs and PAYE to HMRC

22nd - Monthly deadline for electronic remittance of CIS, NICs and PAYE to HMRC

Get the support you need

If you’re newly self-employed or new to starting your limited company, just started up a business, or you’re just trying to get all of your important accounting dates in your calendar, but you have some burning questions or need some extra support, get in touch with our friendly expert advisors.

Our team is always here to assist you with answering your queries or showing you round our software - plus, we've even created online tax calculators to help you crunch numbers! Take a look now.