Understanding corporate income tax in the UK rules is essential for every business trading in the UK. Whether you run a small limited company or manage a growing business, knowing the current corporation tax rate in the UK, filing rules, and payment deadlines can help you avoid penalties and plan your finances with confidence.
This guide explains everything in a clear, practical way, from the company tax rate in the UK and tax thresholds to key deadlines and how to file your returns correctly.
What is Corporate Income Tax in the UK?
Corporation Tax is the UK tax that businesses and some organisations pay on the profits they make. According to HM Revenue & Customs (HMRC), taxable profits can include money earned from trading, income from investments, and profits made when selling company assets. It usually applies to limited companies, overseas companies with UK branches, and some clubs or associations.
Current Corporation Tax Rate in the UK
The current corporate tax rate in the UK depends on your company’s profit level.
Corporation Tax Rates Table
Profit Band | Corporation Tax Rate |
Up to £50,000 | 19% (Small profit rate) |
£50,000 – £250,000 | Marginal relief applies |
Over £250,000 | 25% (Main rate) |
The corporation tax rate in the UK increased from 19% to 25% in April 2023 for larger businesses.
As tax rules change regularly, staying informed is essential for maintaining compliance – read our article to stay informed about recent tax changes in the UK.
Corporation Tax Thresholds UK & Marginal Relief Explained
Corporation tax thresholds help decide how much tax your business needs to pay.
- Lower threshold: £50,000
- Upper threshold: £250,000
If your profits fall between these two limits, your business may qualify for marginal relief corporation tax. This means the tax rate increases gradually, instead of paying the full 25% straight away.
What is Marginal Relief Corporation Tax?
Marginal relief corporation tax helps companies with profits between £50,000 and £250,000 pay less than the full main tax rate.
Instead of moving straight from 19% to 25%, the tax rate increases gradually, which can help reduce the amount of tax your business pays.
This ensures:
- Fair taxation for growing businesses
- Reduced tax burden during scaling stages
Who Needs to File a UK Company Tax Return?
Every limited company in the UK must submit a Company Tax Return to HMRC, even if the business has not made a profit or has no Corporation Tax to pay.
This return is officially known as the Corporation Tax Return (CT600) and is a legal requirement for all active limited companies.
Director Responsibilities
Company directors are legally responsible for ensuring that the business meets its tax obligations, including:
- Filing accurate and complete tax returns
- Submitting the return on time
- Paying any Corporation Tax due by the deadline
Failing to meet these responsibilities may result in penalties or interest charges from HMRC.
How to Pay Corporation Tax in the UK
UK companies can pay their Corporation Tax to HMRC using several convenient payment methods, including:
- Online bank transfer (BACS or CHAPS)
- Direct Debit
- Debit card or corporate credit card
To avoid late payment penalties, HMRC recommends allowing enough time for the payment to clear:
- Up to 3 working days for standard payment methods such as BACS or Direct Debit
- Same-day payment through CHAPS for urgent or last-minute payments
Making payments early helps ensure your Corporation Tax is received on time and keeps your company compliant.
Corporation Tax Payment Deadline in the UK
Understanding the Corporation Tax payment deadline is important to avoid penalties and interest charges. In the UK, the deadline for paying Corporation Tax is usually 9 months and 1 day after the end of your company’s accounting period.
The Corporation Tax Return (CT600) must normally be filed 12 months after the end of the accounting period.
| Requirement | Deadline |
| Corporation Tax payment due | 9 months + 1 day after the accounting period |
| Corporation Tax Return filing | 12 months after the accounting period |
Example:
If your accounting period ends on 31 March 2025:
- Tax payment due: 1 January 2026
- Return filing deadline: 31 March 2026
For detailed rules, payment methods, and updates, refer to official guidance from HM Revenue & Customs on paying Corporation Tax.
Penalties for missing the Corporation Tax return filing deadline
If you miss the deadline for submitting your Corporation Tax Return, HMRC may apply the following penalties for late filing:
| Time after deadline | Penalty |
| 1 day | £100 |
| More than 3 months | Additional £100 |
| More than 6 months | 10% of unpaid tax |
| More than 12 months | Additional 10% of the unpaid tax |
Repeated late filings can lead to higher penalties, so it is best to submit returns on time.
Penalties for late Corporation Tax payment
If your Corporation Tax bill is not paid by the due date, interest will be charged on the outstanding balance. HMRC may also take enforcement action to recover the unpaid amount. This can include:
- Debt collection action
- Recovering money from bank accounts
- Selling company assets
- Legal proceedings
- In serious cases, closing the company
Paying Corporation Tax on time is essential to protect your business finances and avoid unnecessary legal or financial pressure.
What Happens if You Submit Incorrect Information?
Submitting incorrect details in your UK Company Tax Return can lead to penalties from HM Revenue & Customs, depending on how serious the error is. HMRC reviews whether the mistake was accidental, careless, or deliberate before deciding the penalty amount.
Type of Error | Possible Penalty |
Careless errors | 0% to 30% of tax due |
Deliberate errors | Up to 70% |
Deliberate concealment | Up to 100% |
Keeping accurate records and checking all figures before submission is essential. Correct reporting helps avoid fines, delays, and unnecessary compliance issues for your business.
Do you have to pay Corporation Tax on dividends?
Dividends are payments a company makes to shareholders from its profits. Companies do not pay Corporation Tax on dividends they receive. However, individual shareholders may need to pay Income Tax on dividends above the tax-free allowance, which has been reduced from £1,000 to £500 from April 2024.
Are dividends deductible from Corporation Tax?
Paying dividends does not reduce your Corporation Tax bill. Corporation Tax is calculated on company profits before any dividends are distributed.
This means dividends are not a tax-deductible expense and do not lower a company’s taxable profit or appear as a cost in the income statement.
Do sole traders pay Corporation Tax?
Sole traders do not pay Corporation Tax or corporate income tax in the UK. Instead, they pay Income Tax and National Insurance contributions on their business profits through the Self Assessment system.
Ways to Reduce Your Corporation Tax Legally
There are many legitimate ways for companies to ensure they pay only the right amount of Corporation Tax.
With careful and effective tax planning, businesses can reduce their tax liability while improving efficiency. For practical strategies, explore our guide on reducing corporate tax.
- Claim capital allowances on equipment
- Use R&D tax credits
- Apply for Patent Box relief
- Optimise timing of income and expenses
Strategic tax planning can help your business reduce liabilities, improve cash flow, and stay fully compliant. Many companies also use tax outsourcing services to manage reporting efficiently and maintain accuracy as they scale.
Final Thoughts
Understanding corporate income tax in the UK is essential for managing your business finances effectively. From the corporation tax rate in the UK to filing requirements and payment deadlines, getting these right helps avoid penalties and supports better financial planning.
As your business grows, Corporation Tax can become more complex. Having the right systems and expertise in place ensures accuracy, compliance, and long-term efficiency.
Need Help with Corporation Tax?
If you want to ensure accurate filings, optimise your tax position, and meet every corporation tax payment deadline, working with experienced professionals can make a significant difference.
At Befree, we support UK firms with reliable accounting, compliance, and tax solutions, helping you focus on growth while staying fully compliant.
Speak with our team to streamline your Corporation Tax process, reduce risk, and ensure full compliance.
FAQs on Corporate Income Tax
What is the current corporation tax rate in the UK?
The main corporation tax rate in the UK is 25% for companies with profits over £250,000, while smaller companies may pay 19% or a reduced rate through marginal relief.
What is the corporation tax payment deadline?
The corporation tax payment deadline is 9 months and 1 day after the end of your accounting period.
Who needs to file a corporation tax return in the UK?
All UK limited companies and certain organisations must file a corporation tax return in the UK, even if no tax is due.
What are corporation tax thresholds?
The corporation tax thresholds are £50,000 (lower limit) and £250,000 (upper limit), determining which tax rate applies.
What is marginal relief corporation tax?
Marginal relief corporation tax reduces the effective tax rate for companies with profits between £50,000 and £250,000.