Corporation Tax Rates 24 25 Calculator

Calculate your company’s corporation tax liability for the 2024/25 tax year with our accurate, up-to-date calculator.

Comprehensive Guide to Corporation Tax Rates 2024/25

The corporation tax landscape in the UK underwent significant changes in recent years, with the 2024/25 tax year introducing a new tiered system that replaces the previous flat rate. This guide explains everything UK businesses need to know about corporation tax rates for 2024/25, including how to calculate your liability, key thresholds, and planning opportunities.

Understanding the 2024/25 Corporation Tax System

From 1 April 2023, the UK moved from a single corporation tax rate of 19% to a tiered system with:

• Main rate: 25% for companies with profits over £250,000
• Small profits rate: 19% for companies with profits of £50,000 or less
• Marginal relief: A tapered rate between £50,001 and £250,000

These thresholds are proportionally reduced for accounting periods of less than 12 months and for companies with associated companies.

Key Changes from 2023/24 to 2024/25

Feature	2023/24	2024/25
Small profits rate	19%	19% (unchanged)
Main rate	25%	25% (unchanged)
Lower threshold	£50,000	£50,000 (unchanged)
Upper threshold	£250,000	£250,000 (unchanged)
Marginal relief fraction	3/200	3/200 (unchanged)
Diverted Profits Tax rate	31%	31% (unchanged)

While the rates and thresholds remain unchanged from 2023/24 to 2024/25, businesses should be aware of:

1. Increased compliance: More complex calculations required for marginal relief
2. Cash flow impact: Higher tax bills for profitable companies
3. Planning opportunities: Potential benefits from group structures or profit extraction strategies

How Corporation Tax is Calculated in 2024/25

The calculation follows these steps:

1. Determine taxable profits: Start with accounting profits and make tax adjustments
2. Adjust for associated companies: Divide thresholds by (1 + number of associated companies)
3. Apply the appropriate rate:
   • 19% if augmented profits ≤ £50,000 (adjusted)
   • 25% if augmented profits ≥ £250,000 (adjusted)
   • Marginal relief for profits between these thresholds
4. Calculate marginal relief (if applicable):

   Marginal Relief = (Upper limit – Augmented profits) × (Standard fraction) × Augmented profits

   Where Standard fraction = 3/200

Marginal Relief Explained

Marginal relief provides a gradual transition between the small profits rate and the main rate. The formula is:

Tax payable = (Augmented profits × main rate) – Marginal Relief
Where:
Marginal Relief = (Upper limit – Augmented profits) × (Standard fraction/100) × Augmented profits

For 2024/25, the standard fraction remains at 3/200 (1.5%).

Example Calculations

Scenario	Taxable Profits	Associated Companies	Adjusted Thresholds	Corporation Tax Due	Effective Rate
Small company	£40,000	0	£50,000 / £250,000	£7,600	19.0%
Medium company	£120,000	0	£50,000 / £250,000	£26,400	22.0%
Large company	£300,000	0	£50,000 / £250,000	£75,000	25.0%
Small company with 2 associates	£40,000	2	£16,667 / £83,333	£9,133	22.8%

Associated Companies Rules

The definition of associated companies is crucial as it affects your thresholds. Two companies are associated if:

• One company controls the other, or
• Both companies are under common control

“Control” means:

• Ownership of more than 50% of the voting power, or
• Entitlement to more than 50% of the profits or assets on a winding up, or
• Control through another company or series of companies

Important notes:

• Dormant companies are ignored
• Companies under common control for only part of the accounting period are still counted
• The rules look at the entire accounting period, not just the end

Payment Deadlines and Filing Requirements

For the 2024/25 tax year:

• Filing deadline: 12 months after the end of your accounting period
• Payment deadline: 9 months and 1 day after the end of your accounting period
• Quarterly instalments: Required for “large” companies (generally those with profits over £1.5m)

Late filing penalties:

• 1 day late: £100
• 3 months late: Additional £100
• 6 months late: HMRC estimates your bill and adds 10% penalty
• 12 months late: Another 10% penalty

Tax Planning Opportunities for 2024/25

With the higher main rate, tax planning becomes more important. Consider these strategies:

1. Profit extraction:
   • Dividends remain tax-efficient for owner-managed businesses
   • Consider bonus payments to utilize personal allowances
   • Pension contributions can reduce taxable profits
2. Capital allowances:
   • Full expensing for main rate plant and machinery (100% first-year allowance)
   • 50% first-year allowance for special rate assets
   • Annual Investment Allowance remains at £1m
3. Group structures:
   • Consider group relief for losses
   • Review associated company relationships
   • Explore transfer pricing opportunities
4. R&D tax relief:
   • Enhanced relief for SMEs (though reduced from previous years)
   • New merged R&D scheme for larger companies
   • Claim even for unsuccessful projects

Common Mistakes to Avoid

Businesses often make these errors with corporation tax:

1. Incorrect profit calculations: Forgetting to add back disallowable expenses like entertainment or depreciation
2. Missing deadlines: Particularly for quarterly instalments for large companies
3. Ignoring associated companies: Leading to incorrect rate applications
4. Overlooking reliefs: Not claiming available capital allowances or R&D credits
5. Poor record keeping: Inadequate documentation to support claims

Future Corporation Tax Changes

While no major changes are announced for 2025/26, businesses should monitor:

• Potential adjustments to the small profits rate threshold
• Possible changes to capital allowances regimes
• Ongoing reviews of R&D tax relief
• International tax developments (Pillar Two rules)

Official Government Resources

For authoritative information on corporation tax rates and calculations:

• GOV.UK: Corporation Tax rates – Official rates and thresholds
• GOV.UK: Marginal relief guidance – Detailed explanation of marginal relief calculations
• ICAEW: Corporation Tax resources – Professional body guidance and updates

Frequently Asked Questions

What counts as taxable profits for corporation tax?

Taxable profits are your company’s profits for the accounting period, adjusted for tax purposes. This includes:

• Trading profits
• Investment income
• Chargeable gains

You then add back disallowable expenses (like entertainment) and subtract allowable deductions (like capital allowances).

How do I know if I have associated companies?

You have associated companies if another company controls your company, or both companies are under common control. Control means:

• Ownership of more than 50% of the voting power
• Entitlement to more than 50% of the profits
• Entitlement to more than 50% of the assets on winding up

Dormant companies don’t count as associated companies.

When do I need to pay corporation tax?

For most companies, corporation tax is due 9 months and 1 day after the end of your accounting period. However, “large” companies (generally those with profits over £1.5m) must pay in quarterly instalments.

Can I reduce my corporation tax bill?

Yes, there are several legitimate ways to reduce your corporation tax:

• Claim all available capital allowances
• Utilize R&D tax credits if eligible
• Consider pension contributions
• Review your profit extraction strategy
• Claim all allowable business expenses

Always seek professional advice to ensure compliance while optimizing your tax position.

What happens if I pay my corporation tax late?

HMRC charges interest on late payments (currently 7.75% from 22 August 2023). For persistent late payment, you may also face penalties. It’s important to contact HMRC if you’re having difficulty paying on time – they may agree to a time-to-pay arrangement.

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 post-tax profits. Shareholders may also need to pay dividend tax on amounts over their dividend allowance (£500 for 2024/25).

Conclusion

The 2024/25 corporation tax system presents both challenges and opportunities for UK businesses. While the tiered rate structure increases complexity, proper planning can help manage your tax liability effectively.

Key takeaways:

• The 25% main rate applies to profits over £250,000 (adjusted for associated companies)
• Small companies with profits under £50,000 continue to pay 19%
• Marginal relief provides a gradual transition between rates
• Associated company rules significantly impact your thresholds
• Proactive tax planning can legally reduce your liability

For complex situations, particularly where your profits fall in the marginal relief band or you have associated companies, professional advice is strongly recommended to ensure accurate calculations and optimal tax planning.