The UK Tax Year vs. Your Financial Year: What’s the Difference?
When you run a business in the UK, you will come across two different types of “year”. The UK tax year and your company’s financial year. For new business owners, especially those who have recently moved from being a sole trader to a limited company, the difference between the two can be a common source of confusion.
Understanding which year applies to you and for what purpose is essential for meeting your tax and reporting obligations correctly.
The UK Tax Year
The UK tax year, which is sometimes called the “fiscal year,” runs from 6th April to 5th April. This is the year that HM Revenue & Customs (HMRC) uses for all personal tax matters.
Who it applies to:
The UK tax year is most relevant for sole traders and individuals. If you are a sole trader, you must prepare your business accounts to align with the tax year. Your Self-Assessment tax return reports your income and expenses for the period from 6th April to 5th April.
Even if you run a limited company, the tax year is still important for your personal tax affairs. HMRC taxes the dividends you take from your company and any salary you pay yourself based on the tax year in which you receive them.
The government sets the tax year, and you cannot change it.
Your Company’s Financial Year
A company’s financial year, which is also known as its “accounting period,” is the 12-month period that a limited company uses for its own financial reporting.
Who it applies to:
The financial year is only relevant for limited companies. When you incorporate a limited company, you can choose its financial year-end date. This is the date that your annual accounts will be prepared up to.
For example, you could choose to have your financial year run from 1st January to 31st December, or from 1st April to 31st March. The choice is up to you.
Your company’s financial year is used for two main purposes:
- Preparing your annual accounts: Your accounts will show your company’s financial performance for this 12-month period.
- Calculating your Corporation Tax: Your Corporation Tax bill is based on the profits your company made in its financial year.
The Key Differences Summarised
In summary, the government sets the UK tax year, which runs from 6th April to 5th April. Sole traders and individuals use it for their personal tax affairs. A company’s financial year works differently. The company director chooses this 12-month period, and the company uses it for its accounts and Corporation Tax.
Why Does the Difference Matter?
Understanding the difference is crucial for meeting your deadlines. As a sole trader, your key deadline is 31st January, which is linked to the end of the tax year.
As a limited company director, you have a different set of deadlines that are linked to your company’s financial year-end. Your annual accounts are due 9 months after your year-end, and your Corporation Tax is due 9 months and 1 day after your year-end.
This is why a sole trader and a limited company director who are in business together might have completely different deadlines to worry about.
When Getting Advice Can Help
Choosing a financial year-end date is one of the first decisions you will make as a new company director. The date you choose can have a real impact on your tax payments and your administrative workload. You are not expected to be an expert. Getting professional advice can help you make the right choice for your business.
If you would like calm, practical support, Penney’s Accountancy works with UK small businesses in Farnborough and the surrounding areas. We can help you understand the difference between and advise you on the best year-end date for your new company.
Want to Learn More in Your Own Time?
For those who want to build their confidence and understand these topics in more detail. Penney’s Finance School offers an online, self-paced business and finance course. It covers everything from company setup to cash flow and tax, allowing you to learn at your own pace.
Important information
This article offers general guidance for UK businesses only. It reflects UK tax legislation and HMRC guidance as of September 2026.
Tax rules and business requirements can change, and individual circumstances vary. Before acting on any of the information above, we recommend speaking to a qualified accountant who can provide advice tailored to your specific situation.