How to Choose a Company Year-End Date

When you incorporate a new limited company, one of the first decisions to make is choosing your company year-end date. This is the date that your company’s financial year will end and the date that your annual accounts will be prepared up to. It is a more important decision than many new directors realise. It has a direct impact on your key deadlines for filing accounts and paying Corporation Tax.

While you can change your year-end date later, it is a good idea to make a considered choice from the start. This guide is written to explain the options of each, to help you make the best decision for your business.

What are the Options?

When you set up your company, your first financial year will automatically be set to end on the last day of the month in which the company was incorporated, one year later. For example, if you incorporate your company on 10th May 2025, your first year-end will automatically be set to 31st May 2026.

However, you can choose to change this to any date you like. The three most common choices are:

1. 31st March
2. 31st December
3. A date that aligns with your business’s seasonal cycle

Let’s look at the pros and cons of each.

Option 1: A 31st March Year-End

Choosing a 31st March year-end is a very popular option because it aligns closely with the UK personal tax year, which ends on 5th April. This can make tax planning much simpler.

Pros:

• Easier tax planning: It is easier to align your personal tax planning (for your salary and dividends) with your company’s financial performance.
• Simpler for sole traders who have incorporated: If you have recently moved from being a sole trader to a limited company, using a 31st March year-end feels familiar and consistent with the tax year you are used to.

Cons:

• It is a very busy time for accountants. Because so many businesses have a March year-end, accountants are often at their busiest in the run-up to the 31st December (the 9-month filing deadline). This can sometimes mean you get less personal attention.

Option 2: A 31st December Year-End

Choosing a 31st December year-end is another popular choice because it aligns with the calendar year. This can feel very logical and easy to remember.

Pros:

• Simple and logical: It is easy to remember that your financial year is the same as the calendar year.
• Quieter time for accountants: Your filing deadline will be at the end of September. Often a less busy time for accountants than the January Self-Assessment rush.

Cons:

• Your year-end falls during the Christmas period. This can be a very busy time for many businesses and for you personally, which can make it a difficult time to be dealing with year-end administration.

Option 3: A Date That Suits Your Business

You do not have to choose March or December. You can choose any year-end date you like. For many businesses, it makes sense to choose a date that aligns with their natural business cycle.

For example, if you run a retail business that is very busy in the run-up to Christmas, the last thing you want to be doing in January is dealing with your year-end. In this case, a 31st January year-end might be a good choice, as it falls after your busiest period.

Pros:

• Fits your business: You can choose a date that falls in your quietest period, giving you more time to focus on your accounts.
• Spreads the workload: For both you and your accountant, having a year-end that is different from the majority can mean a more focused and less rushed process.

Cons:

• It does not align with the tax year. This can make personal tax planning a little more complex, as you will need to consider dividends paid in different company financial years to work out your income for a single tax year.

When Getting Advice Can Help

Choosing your company year-end date is a strategic decision that can have a real impact on your administrative workload and your tax planning. There is no single “right” answer; the best choice depends on your specific business and personal circumstances. You are not expected to be an expert, and getting professional advice can help you make an informed decision.

If you would like calm, practical support, Penney’s Accountancy works with UK small businesses in Farnborough and the surrounding areas. We can talk you through the options and help you choose the year-end date that is right for you.

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

The information provided in this article is intended as general guidance for UK businesses only and 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.