Corporation Tax Rates 2023/24 Calculator
Calculate your company’s corporation tax liability for the 2023/24 tax year with our accurate, up-to-date calculator.
Comprehensive Guide to Corporation Tax Rates 2023/24
Understanding corporation tax rates for the 2023/24 tax year is essential for UK business owners, accountants, and financial directors. This guide provides a detailed breakdown of the current rates, thresholds, and calculation methods to help you accurately determine your company’s tax liability.
Key Changes in 2023/24 Corporation Tax
The 2023/24 tax year introduced significant changes to the UK’s corporation tax system, marking the most substantial reform in nearly 50 years. The key changes include:
- Introduction of a two-tier system: Companies now face different tax rates depending on their profit levels
- Increased main rate: The main corporation tax rate rose from 19% to 25% for companies with profits over £250,000
- Small profits rate: Companies with profits of £50,000 or less continue to pay 19%
- Marginal relief: A tapered relief system for companies with profits between £50,000 and £250,000
- Adjusted thresholds for associated companies: The £50,000 and £250,000 thresholds are divided by the number of associated companies
Corporation Tax Rates for 2023/24
| Profit Range | Tax Rate | Notes |
|---|---|---|
| £0 – £50,000 | 19% | Small profits rate (SME rate) |
| £50,001 – £250,000 | 19% – 25% | Marginal relief applies (effective rate between 19% and 25%) |
| Over £250,000 | 25% | Main rate |
For companies with associated companies, these thresholds are divided by the number of associated companies plus one. For example, if you have 2 associated companies, the thresholds become:
- Lower threshold: £50,000 ÷ 3 = £16,667
- Upper threshold: £250,000 ÷ 3 = £83,333
How Marginal Relief Works
Marginal relief provides a gradual increase in the effective tax rate for companies with profits between the lower and upper thresholds. The formula for calculating marginal relief is:
Marginal Relief = (Upper Limit – Taxable Profits) × (Standard Fraction)
Where:
– Upper Limit = £250,000 (or £250,000 ÷ number of associated companies + 1)
– Standard Fraction = 3/200 (for the 2023/24 tax year)
The effective corporation tax rate with marginal relief is calculated as:
Effective Tax Rate = [(Taxable Profits × Main Rate) – Marginal Relief] ÷ Taxable Profits
Example Calculations
Let’s examine three scenarios to illustrate how the new system works:
Example 1: Company with £40,000 Profits (No Associated Companies)
This company falls below the £50,000 threshold and pays the small profits rate:
Corporation Tax = £40,000 × 19% = £7,600
Example 2: Company with £150,000 Profits (No Associated Companies)
This company falls in the marginal relief band. The calculation would be:
- Standard corporation tax: £150,000 × 25% = £37,500
- Marginal relief: (£250,000 – £150,000) × 3/200 = £1,500
- Tax payable: £37,500 – £1,500 = £36,000
- Effective rate: (£36,000 ÷ £150,000) × 100 = 24%
Example 3: Company with £300,000 Profits and 1 Associated Company
With one associated company, the thresholds are divided by 2:
- Lower threshold: £50,000 ÷ 2 = £25,000
- Upper threshold: £250,000 ÷ 2 = £125,000
Since £300,000 exceeds the adjusted upper threshold (£125,000), the company pays the main rate:
Corporation Tax = £300,000 × 25% = £75,000
Special Considerations
Research and Development (R&D) Tax Relief
Companies claiming R&D tax relief can significantly reduce their taxable profits. For the 2023/24 tax year:
- SME R&D relief: 86% enhancement on qualifying R&D expenditure (186% total deduction)
- RDEC (large company scheme): 20% of qualifying R&D expenditure
Our calculator automatically adjusts your taxable profits when you enter an R&D claim amount.
Patent Box Regime
The Patent Box allows companies to apply a lower 10% corporation tax rate to profits earned from patented inventions. To qualify:
- Your company must own or exclusively license qualifying patents
- You must have undertaken qualifying development on the patented invention
- You must elect into the Patent Box regime with HMRC
The calculator provides options to account for Patent Box elections in your tax calculation.
Payment Deadlines and Filing Requirements
For the 2023/24 tax year, the key deadlines are:
| Company Type | Accounting Period End Date | Filing Deadline | Payment Deadline |
|---|---|---|---|
| All companies | 31 March 2024 | 31 March 2025 | 1 January 2025 (9 months and 1 day after accounting period ends) |
| All companies | 30 April 2024 | 30 April 2025 | 1 February 2025 |
| Large companies (quarterly instalments) | Any date | 12 months after accounting period ends | Instalments due in months 7, 10, 13, and 16 of the accounting period |
Large companies (generally those with annual taxable profits over £1.5 million) must pay their corporation tax in quarterly instalments.
Common Mistakes to Avoid
When calculating your corporation tax liability, be aware of these common pitfalls:
- Ignoring associated companies: Forgetting to account for associated companies can lead to incorrect threshold calculations and potential underpayment of tax.
- Incorrect accounting periods: Using the wrong accounting period length can significantly affect your tax calculation, especially for companies with non-standard year ends.
- Missing R&D claims: Failing to include R&D tax relief can result in overpaying corporation tax.
- Misapplying marginal relief: The marginal relief calculation is complex – our calculator handles this automatically to ensure accuracy.
- Late payments: Missing payment deadlines can result in interest charges and penalties from HMRC.
How to Reduce Your Corporation Tax Bill
There are several legitimate ways to reduce your corporation tax liability:
- Claim all allowable expenses: Ensure you’re claiming for all legitimate business expenses, including:
- Staff salaries and benefits
- Office costs (rent, utilities, rates)
- Travel and subsistence
- Marketing and advertising
- Professional fees (accountants, lawyers)
- Capital allowances: Claim capital allowances on qualifying plant and machinery purchases. The Annual Investment Allowance (AIA) is £1 million for 2023/24.
- R&D tax relief: If your company engages in qualifying research and development, claim the available reliefs.
- Patent Box: If you have patented inventions, elect for the Patent Box regime to apply the 10% tax rate to relevant profits.
- Pension contributions: Employer pension contributions are tax-deductible and can reduce your taxable profits.
- Loss relief: If your company has made losses, you may be able to carry them back or forward to offset against profits.
Recent Trends in Corporation Tax
The UK’s corporation tax landscape has undergone significant changes in recent years. Key trends include:
- Increasing rates: After decades of gradual reduction, corporation tax rates have increased to 25% for larger companies.
- Targeted reliefs: The government has introduced or enhanced specific reliefs (like R&D tax credits) to encourage particular business activities.
- Digitalisation: HMRC’s Making Tax Digital initiative is transforming how companies report and pay their taxes.
- International coordination: The UK has implemented measures to comply with international tax agreements, including the OECD’s base erosion and profit shifting (BEPS) project.
- Environmental incentives: New tax incentives for environmentally friendly business practices are being introduced.
Comparing UK Corporation Tax with Other Countries
The UK’s corporation tax rates remain competitive compared to other major economies:
| Country | Standard Corporation Tax Rate (2023) | SME Rate (if applicable) | Notes |
|---|---|---|---|
| United Kingdom | 25% | 19% (for profits ≤ £50,000) | Marginal relief between £50,000 and £250,000 |
| United States | 21% | 21% | Flat rate with state taxes adding 0-12% |
| Germany | 15% | 15% | Plus ~14-17% trade tax (Gewerbesteuer) |
| France | 25% | 15% (for profits ≤ €42,500) | Reduced rate for SMEs |
| Canada | 15% | 9% (for active business income ≤ CAD 500,000) | Provincial taxes add 10-16% |
| Australia | 30% | 25% (for “base rate entities”) | Lower rate for SMEs with turnover < AUD 50m |
While the UK’s main rate of 25% is higher than some competitors, the small profits rate of 19% remains highly competitive for smaller businesses. The marginal relief system also provides a smoother transition between rates compared to some countries with abrupt threshold changes.
Future Outlook for Corporation Tax
Looking ahead, several factors may influence UK corporation tax rates and policies:
- Economic performance: Future rate changes may depend on the UK’s economic growth and public finance requirements.
- International competition: The UK may adjust rates to remain competitive for foreign investment.
- Tax digitalisation: HMRC’s Making Tax Digital programme will continue to evolve, potentially affecting reporting requirements.
- Environmental policies: New tax incentives for green technologies and penalties for high-emission activities may be introduced.
- Brexit adjustments: Post-Brexit, the UK has more flexibility to set its own tax policies, which may lead to further reforms.
Expert Tips for Corporation Tax Planning
To optimise your company’s tax position, consider these expert strategies:
- Review your accounting period: The timing of income and expenses can significantly affect which tax year they fall into. Consider whether deferring or accelerating income/expenditure could be beneficial.
- Maximise capital allowances: Take full advantage of the Annual Investment Allowance (AIA) and other capital allowances for equipment purchases.
- Consider group structures: For companies with associated businesses, review whether restructuring could optimise your overall tax position.
- Plan for R&D claims: Ensure you have robust systems for tracking qualifying R&D expenditure throughout the year.
- Review shareholder remuneration: The balance between salaries, dividends, and other remuneration methods can affect both corporation tax and personal tax liabilities.
- Monitor marginal relief: If your profits are near the thresholds, consider whether actions to increase or decrease profits could optimise your tax position.
- Plan for patent applications: If you have patentable inventions, consider applying for patents to benefit from the Patent Box regime.
- Review loss utilisation: Ensure you’re making the most of any brought-forward or current-year losses.
- Consider pension contributions: Employer pension contributions can be an effective way to extract profits while reducing corporation tax.
- Stay informed about changes: Corporation tax rules change frequently – stay updated on announcements from HMRC and in the Budget statements.
Authoritative Resources
For the most accurate and up-to-date information on corporation tax rates and calculations, consult these official sources:
- GOV.UK: Corporation Tax Rates – Official government information on current corporation tax rates and thresholds.
- GOV.UK: Marginal Relief Worksheet – HMRC’s official worksheet for calculating marginal relief.
- ICAEW: Corporation Tax Guidance – Comprehensive guidance from the Institute of Chartered Accountants in England and Wales.
Frequently Asked Questions
What counts as an associated company?
An associated company is any company that is under the control of the same person or group of people as your company. This includes:
- Subsidiary companies
- Companies under common control (e.g., two companies owned by the same person)
- Companies where there’s substantial commercial interdependence
Dormant companies are generally not counted as associated companies.
How do I know if I need to pay quarterly instalments?
You must pay corporation tax in quarterly instalments if your company is considered ‘large’ for tax purposes. A company is large if:
- Its taxable profits for the accounting period exceed £1.5 million, or
- It was large in the previous accounting period (unless its taxable profits are less than £10 million divided by the number of associated companies)
Can I change my accounting period?
Yes, you can change your company’s accounting period, but there are rules to follow:
- You must notify HMRC of any changes
- The change must be for genuine commercial reasons
- Shortening an accounting period is generally straightforward
- Lengthening an accounting period is only allowed in specific circumstances
Changing your accounting period can affect when profits are taxed, so it’s important to consider the tax implications.
What happens if I pay my corporation tax late?
If you pay your corporation tax late, HMRC will charge:
- Interest: Currently at 7.75% (as of 2023/24) from the due date until payment
- Penalties:
- 1 day late: £100 penalty
- 3 months late: Another £100 penalty
- 6 months late: HMRC will estimate your tax bill and you’ll have to pay an additional 10% of the unpaid tax
- 12 months late: Another 10% of the unpaid tax
For persistent late payers, HMRC may take more serious action including legal proceedings.
How does corporation tax affect dividends?
Corporation tax is paid by the company on its profits before dividends are distributed. Dividends are then paid from the after-tax profits. Shareholders may need to pay additional dividend tax on the distributions they receive, depending on their personal tax situation.
The interaction between corporation tax and dividend tax makes tax planning important for owner-managed businesses to optimise the overall tax position.
Conclusion
The 2023/24 corporation tax system represents a significant change from previous years, with the introduction of a two-tier system and marginal relief calculations. Understanding these changes is crucial for accurate tax planning and compliance.
This calculator provides a reliable way to estimate your company’s corporation tax liability, taking into account the complex interactions between profit levels, associated companies, accounting periods, and available reliefs. However, for complex situations or high-value calculations, we recommend consulting with a qualified tax advisor.
Remember that tax planning should be an ongoing process throughout your accounting period, not just something to consider at year-end. Regular reviews of your company’s financial position can help identify opportunities to optimise your tax position while remaining fully compliant with HMRC requirements.
For the most accurate results, ensure you have up-to-date financial information and consider all available reliefs and allowances. The UK’s corporation tax system offers several opportunities for tax-efficient structuring, but these require careful planning and professional advice.