Having a business in the UK is not solely about clients, sales, or employees — it’s also about keeping your finances in order. One of the most important aspects of running a business is tax deadlines. Failure to comply with them can incur fines, cause undue stress, and damage your business’s reputation with HMRC.
As a sole trader, limited company director, or partnership owner, understanding when to pay and file your tax is important. To help you stay organised, this guide breaks down the most important tax deadlines every UK business owner needs to remember.
1. Deadlines for Self-Assessment Tax Returns
If you work for yourself, are a company director, or make money outside of PAYE, you need to file a Self-Assessment tax return. Mark the following notable dates in your calendar:
- 31st January – This is when you need to submit your online Self-Assessment return and pay any tax you are due on account for the last tax year (running from 6th April to 5th April). It’s also when your first “payment on account” is due if applicable.
- 31st July – The second payment on account deadline. This applies to those who make advance payments toward their next tax bill.
If you miss these dates, you’ll automatically get a fine of at least £100, plus interest on any unpaid tax.
2. Corporation Tax Deadlines
If your business is a limited company, Corporation Tax will be among your responsibilities. The regulations are slightly different from Self-Assessment.
- Submitting your Company Tax Return (CT600): This must be submitted within 12 months from the end of your company’s accounting period.
- Paying Corporation Tax: Pay 9 months and 1 day after the end of your company’s accounting period. If your accounting year finishes on 31st March, for instance, your tax is due on 1st January the following year.
Large businesses with profits over £1.5 million might need to pay by installments, so it’s a good idea to check which group your company belongs to.
3. Deadlines for VAT
Businesses that are registered for VAT need to pay close attention to their filing dates because missing them can quickly lead to extra charges.
- VAT Returns: You usually file these every three months. Usually, the due date is one month and seven days after the end of your VAT period. For instance, if your quarter closes on 31st March, the return and payment need to be made by 7th May.
- VAT Annual Accounting Scheme: If you’re on the VAT Annual Accounting Scheme, you’ll pay in advance all year and only have to file one return at the end of the year.
Because of Making Tax Digital (MTD), you now have to file your VAT returns online using compatible software. Make sure your system is set up correctly.
4. PAYE and National Insurance
If you have employees, you have to collect and pay Income Tax and National Insurance through PAYE. These also have their own due dates:
- Monthly payments for PAYE and NIC payments: Due to HMRC by the 22nd of the month after (or the 19th if you send it).
- Full Payment Submission (FPS): You need to inform HMRC of employees’ pay and deductions on or before pay day.
You should always meet PAYE deadlines because if you don’t, you’ll have to pay a fine even if you pay on time.
5. Important Dates for All Business Owners Every Year
There are certain dates in the UK tax calendar that you should never forget, in addition to regular deadlines:
- 5th April – April 5th is the last day of the UK tax year. This is when your expenses and earnings are closed off for the year.
- 6th April – The beginning of the new tax year. It’s also when new tax thresholds or rules usually take effect.
- 31st October – Deadline for paper Self-Assessment returns (if you still file by post).
These dates create the rhythm of the UK tax year and are important reference points to bear in mind throughout all your financial planning.
6. Other Important Dates to Keep in Mind
- CIS Returns (Construction Industry Scheme): As a contractor, you must send in CIS returns (Construction Industry Scheme) by the 19th of each month.
- Companies House’s Confirmation Statement: It’s not really a tax deadline, but every business needs to send in a confirmation statement at least once a year.
7. Staying on Top of Deadlines
It’s not surprising that some business owners get flustered when they have to keep track of so many dates. The good news is that there are concrete actions you can take to prevent late fees and undue stress:
- Use online calendars: Enter tax deadlines into your calendar with reminders a few weeks in advance.
- Work with an accountant: Employ an accountant to monitor deadlines and ensure that all your filings are accurate.
- Use accounting software: HMRC-accepted software simplifies filing VAT, payroll, and other forms.
- Don’t wait until the very last minute: Filing early gives you a bit more time in case something happens.
Final Thoughts
Tax deadlines may seem intimidating, but once you know them, they’re just part of your business routine. By keeping these dates in mind, you won’t have to pay fines, you’ll have better control over your cash flow, and HMRC will be happy with you.
Not only do you not have to pay fines if you are in good standing, but you also need to build a strong foundation for your business so it can grow. Deadlines are checkpoints that keep you on track with your finances as you work and grow your business.