How To Calculate Overlap Relief

Calculate your overlap relief when changing accounting periods. Enter your financial details below to determine your eligible relief amount.

Comprehensive Guide: How to Calculate Overlap Relief

Overlap relief is a crucial tax relief mechanism in the UK that helps self-employed individuals and partnerships avoid being taxed twice on the same income when their accounting periods change. This typically occurs when:

• You start self-employment and your first accounting period doesn’t align with the tax year
• You change your accounting date
• You cease self-employment and your final accounting period doesn’t align with the tax year

Understanding Overlap Periods

An overlap period occurs when:

1. Your accounting period doesn’t match the tax year (6 April to 5 April)
2. The same period of time is included in two different tax assessments

For example, if your accounting year ends on 30 June, your basis period for the 2023/24 tax year would be from 1 July 2022 to 30 June 2023. The period from 1 July 2022 to 5 April 2023 would be taxed in both the 2022/23 and 2023/24 tax years, creating an overlap of 279 days.

When Can You Claim Overlap Relief?

You can claim overlap relief in the following situations:

• When your business ceases
• When you change your accounting date (with HMRC’s agreement)
• In the tax year before the one where the change of accounting date takes effect

The amount of overlap relief you can claim is the lower of:

1. The overlap profits brought forward from earlier years
2. The profits of the period of overlap in the year you’re making the claim

Step-by-Step Calculation Process

To calculate your overlap relief accurately, follow these steps:

1. Identify the overlap period:

   Determine the number of days that overlap between your old and new accounting periods. This is typically calculated by counting the days between your old accounting period end date and the new accounting period start date that fall within the same tax year.

2. Calculate your daily profit rate:

   Divide your total profits for the relevant period by the number of days in that period to get your daily profit rate. The formula is:

   Daily Profit Rate = Total Profits / Number of Days in Period

3. Determine overlap profits:

   Multiply your daily profit rate by the number of days in the overlap period to find the overlap profits.

   Overlap Profits = Daily Profit Rate × Number of Overlap Days

4. Calculate the tax saved:

   Apply your relevant tax rate to the overlap profits to determine how much tax you’ll save by claiming the relief.

   Tax Saved = Overlap Profits × (Tax Rate / 100)

5. Determine net overlap relief:

   The net overlap relief is simply the overlap profits minus the tax saved (though in practice, you’re reducing your taxable income by this amount).

Practical Example

Let’s work through a practical example to illustrate how overlap relief works:

Scenario: You started your business on 1 October 2021 with an accounting date of 30 September. In 2024, you decide to change your accounting date to 31 December. Your profits for the year ending 30 September 2023 were £75,000, and for the period 1 October 2023 to 31 December 2023 were £30,000.

Period	Dates	Days	Profits
Original Basis Period	1 Oct 2022 – 30 Sep 2023	365	£75,000
New Accounting Period	1 Oct 2023 – 31 Dec 2023	92	£30,000
Overlap Period	1 Oct 2023 – 31 Dec 2023	92	£18,219

Calculations:

1. Daily profit rate: £75,000 / 365 = £205.48 per day
2. Overlap profits: £205.48 × 92 = £18,904.16
3. Assuming 40% tax rate: £18,904.16 × 0.40 = £7,561.66 tax saved
4. Net overlap relief: £18,904.16

Common Mistakes to Avoid

When calculating overlap relief, many taxpayers make these common errors:

• Incorrect overlap period calculation:

  Failing to accurately count the days in the overlap period can lead to significant errors in your claim. Always double-check your dates and use a date calculator if necessary.

• Using wrong profit figures:

  Make sure you’re using the correct profit figures for the relevant periods. Using the wrong year’s profits will give you an incorrect overlap relief amount.

• Forgetting to claim:

  Many taxpayers don’t realize they’re eligible for overlap relief or forget to claim it when they change accounting dates or cease trading.

• Incorrect tax rate application:

  Applying the wrong tax rate to your overlap profits will result in an incorrect tax saved calculation. Always use your actual tax rate for the relevant year.

• Not keeping records:

  HMRC may ask for evidence of your overlap period and calculations. Always keep detailed records of how you calculated your overlap relief.

How to Claim Overlap Relief

To claim overlap relief, you need to:

1. Include it in your Self Assessment tax return:

   When completing your tax return, there’s a specific section for overlap relief. You’ll need to enter the amount of overlap profits you’re claiming relief for.

2. Provide supporting calculations:

   While you don’t need to submit your calculations with your tax return, you should keep them in case HMRC asks for evidence.

3. Claim in the correct tax year:

   Overlap relief can only be claimed in specific circumstances (when changing accounting date or ceasing trade), so make sure you’re claiming it in the right tax year.

4. Get professional advice if needed:

   If your situation is complex or you’re claiming a large amount of overlap relief, it may be worth consulting with an accountant to ensure you’re doing it correctly.

Overlap Relief vs. Other Tax Reliefs

It’s important to understand how overlap relief differs from other types of tax relief available to self-employed individuals:

Relief Type	Purpose	When Available	Calculation Basis
Overlap Relief	Prevents double taxation of same income	When changing accounting date or ceasing trade	Based on overlap period profits
Trading Allowance	Simplifies tax for small businesses	For trading income under £1,000	Flat £1,000 deduction
Capital Allowances	Relief for business asset purchases	When buying equipment for business	Based on asset cost and type
Loss Relief	Offsets trading losses against other income	When business makes a loss	Based on amount of trading loss

Recent Changes and Updates

The rules around overlap relief have seen some changes in recent years. As of the 2023/24 tax year:

• The basis period reform has changed how overlap relief is calculated for some taxpayers
• New rules apply to businesses that don’t draw up annual accounts
• The transition to the new rules may create additional overlap periods for some taxpayers
• HMRC has updated its guidance on how to calculate overlap relief under the new system

It’s particularly important to be aware of these changes if you’re:

• A new business that started after 5 April 2023
• A business that doesn’t prepare annual accounts
• Changing your accounting date
• Ceasing self-employment

Professional Advice and Resources

While this guide provides comprehensive information on calculating overlap relief, every business situation is unique. If you’re unsure about any aspect of your overlap relief calculation, it’s wise to:

• Consult with a qualified accountant or tax advisor
• Contact HMRC’s Self Assessment helpline for clarification
• Use HMRC’s official calculators and tools
• Review the latest government guidance on overlap relief

Authoritative Resources on Overlap Relief

HMRC Business Income Manual: Overlap Relief (BIM81000) GOV.UK: Overlap Relief for Self Assessment ICAEW: Guide to Overlap Relief

Frequently Asked Questions

Q: Can I claim overlap relief more than once?

A: No, you can only claim overlap relief once for each period of overlap. Once you’ve claimed relief for an overlap period, you can’t claim it again.

Q: What happens if I don’t claim overlap relief when I’m eligible?

A: If you don’t claim overlap relief when you’re eligible, you’ll effectively pay tax twice on the same income. You can’t go back and claim it later, so it’s important to claim it at the right time.

Q: How do I know if I have an overlap period?

A: You’ll have an overlap period if your accounting period doesn’t align with the tax year (6 April to 5 April) and the same period is included in two different tax assessments. Your accountant or tax software should be able to identify this for you.

Q: Can I claim overlap relief if I’m a partner in a partnership?

A: Yes, the same rules apply to partners in a partnership as to sole traders. Each partner can claim overlap relief for their share of the overlap profits.

Q: What if my overlap period spans more than one tax year?

A: If your overlap period spans more than one tax year, you’ll need to apportion the overlap profits between the relevant tax years based on the number of days in each year.

Final Thoughts

Understanding and correctly calculating overlap relief can save you significant amounts in tax, especially if you have substantial overlap profits. The key points to remember are:

• Overlap relief prevents double taxation of the same income
• It’s available when changing accounting dates or ceasing trade
• Accurate calculation requires precise dating and profit figures
• You must claim it in your Self Assessment tax return
• Professional advice can be invaluable for complex situations

By using the calculator above and following the guidance in this article, you should be able to accurately calculate your overlap relief and ensure you’re not paying more tax than necessary. Remember to keep detailed records of your calculations and claim the relief at the appropriate time.