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How and When to Register for Corporation Tax in the UK

Updated: Feb 22


Registering for Corporation Tax is a crucial step for every company operating within the United Kingdom. Most companies in the UK register for Corporation Tax and PAYE as an employer simultaneously while registering with Companies House. Registration is required for companies that have registered with Companies House but have not registered for Corporation Tax, companies registered by post, companies using an agent, or those using third-party software. If you've already registered for Corporation Tax, you can sign in to the HMRC online services to file your company tax return or make a payment.


Navigating the realm of Corporation Tax in the UK can be a daunting task for business owners and entrepreneurs. Understanding when and how to register for Corporation Tax is crucial for compliance and financial management. This article delves into the essential steps and timelines for registering for Corporation Tax in the UK, ensuring your business adheres to HM Revenue and Customs (HMRC) requirements.


How and When to Register for Corporation Tax in the UK


Understanding Corporation Tax

Corporation Tax is levied on the profits of limited companies, foreign companies with UK branches, and unincorporated associations. Unlike personal taxes, there's no bill sent for Corporation Tax; businesses must calculate, report, and pay this tax on their own initiative. It's pivotal to recognize that the tax rates may vary, with the standard rate set at 19% for profits under £50,000, scaling up to 25% for profits exceeding this threshold


When to Register for Corporation Tax

Most companies in the UK register for Corporation Tax and PAYE as an employer simultaneously with their registration at Companies House. However, if you've registered your company by post, through an agent, or using third-party software, you'll need to register for Corporation Tax separately.


The critical timeline for registering your company for Corporation Tax is within three months from the start of any business activity. Delay in registration can lead to penalties, making timely action essential.


The key point to remember is that you must register within three months of starting to do business. This includes activities such as buying, selling, advertising, renting a property, and employing someone. If you're unsure about what counts as starting to do business, it's advisable to check with the relevant authorities. Be aware that there may be penalties for late registration.


How to Register for Corporation Tax

To register for Corporation Tax, you'll need to sign in to your business tax account. Follow the guidance provided in your account to complete the registration process. You'll need your company’s Government Gateway user ID and password to sign in. If you don't have a user ID, you can create one when you sign in.


Additionally, you'll need your company’s 10-digit Unique Taxpayer Reference (UTR). This is posted to your company address by HM Revenue and Customs (HMRC) within 14 days of the company being registered with Companies House (incorporated). If you did not receive your UTR after registering your company, you can request it online.


Information to Provide to HMRC

During the registration process, you'll need to provide HMRC with your company’s registration number, the date you started to do business (your company’s first accounting period will start from this date), and the date your annual accounts are made up to.


The Registration Process

  1. Initial Steps: Registration begins once your company is incorporated with Companies House, which automatically informs HMRC of your company's formation. HMRC, in turn, sends a Unique Taxpayer Reference (UTR) to the company's registered address. This UTR is vital for the Corporation Tax registration process.

  2. Online Registration: To register for Corporation Tax, you need to sign into your business tax account on the HMRC website using your company’s Government Gateway user ID and password. If you don’t have a user ID, you can create one during this process. You'll need your company's 10-digit UTR, registration number, the date business activities started, and the date your annual accounts are made up.

  3. After Registration: Following successful registration, HMRC sends a Corporation Tax activation code by post, instructions for setting up online services, and the deadline for your first Corporation Tax payment.



Here Is a Step-By-Step Guide On How to Register for Corporation Tax in 2024


Step 1: Determine Your Eligibility

Before you start the process, ensure that your business is required to pay Corporation Tax. Generally, all limited companies based in the UK or foreign companies with a UK branch or office need to pay Corporation Tax.


Step 2: Set Up Your Company

If you're starting a new business, you'll need to set it up with Companies House. When you register, you'll get a 'certificate of incorporation'. This confirms your company legally exists and shows the company number and date of formation.


Step 3: Register Within Three Months

You must register for Corporation Tax within three months of starting to do business. This includes buying, selling, advertising, renting a property, and employing someone. You can face penalties if you fail to register within this period.


Step 4: Use the Government Gateway

To register, you will use the UK government's online services, accessible via the Government Gateway. If you do not have a user ID and password, you will need to create one.


Step 5: Provide Your Company's Information

During registration, you'll need to provide the company's details. This includes:


  • The date you started to do business (your 'accounting period' for Corporation Tax will start from this date)

  • The date that you'll make your annual accounts up to

  • The company's registration number (given to you when you registered with Companies House)

  • The main address where you do business

  • The type of business you run


Step 6: Appoint an Agent

If you want someone else to deal with HM Revenue and Customs (HMRC) on your behalf, like an accountant, you can appoint them as your agent. This can be done during the registration process.


Step 7: Keep Records

Once registered, you must keep proper records of your business income, costs, and expenses. These will be used to prepare your Company Tax Return and calculate your Corporation Tax.


Step 8: Pay Your Corporation Tax

You are responsible for calculating how much Corporation Tax you owe and paying it. This must be done within 9 months and 1 day from the end of your 'accounting period' - which is usually your financial year.


Step 9: File a Company Tax Return

Lastly, you need to file a Company Tax Return, even if you make a loss or have no Corporation Tax to pay. This should be done within 12 months after your accounting period ends.


Following these steps will help you navigate the process of registering for Corporation Tax in the UK. Remember, it's essential to comply with these regulations to avoid penalties and ensure your business operates smoothly. Please note that the process and requirements may vary slightly, so always refer to the official UK government website or consult with a tax professional to understand your specific obligations.


After Registration

Once you've registered, HMRC will inform you of the deadline for paying Corporation Tax. Remember, you'll need to file a Company Tax Return, even if you make a loss or have no Corporation Tax to pay.



Filing and Payment Deadlines


Tax Returns and Payments: The deadline for filing your Company Tax Return is 12 months after the end of your accounting period. Corporation Tax payments are due nine months and one day after the end of the accounting period​.

Penalties for Late Filing: Late filing or payment incurs penalties starting from £100 for one day late, increasing with time, and can include interest on the overdue amount.

Keeping Records

Maintaining accurate financial records is not only a legal requirement but also essential for calculating your Corporation Tax. This includes annual accounts, bank statements, invoices, payroll records, and VAT records, among others.


Special Considerations


  • Dormant Companies: If your company has been dormant since incorporation or for a full Corporation Tax accounting period, you're exempt from filing a Company Tax Return or accounts for that period.

  • Accounting Periods: The Corporation Tax accounting period typically aligns with your company's financial year but cannot exceed 12 months. For companies trading immediately after incorporation, the first year may involve filing two Tax Returns if the financial year exceeds 12 months.


Registering for and managing Corporation Tax is a pivotal aspect of running a business in the UK. By adhering to the timelines, understanding the process, and maintaining accurate records, businesses can ensure compliance with HMRC regulations, avoid penalties, and manage their financial obligations effectively. Always consider seeking professional advice for complex situations or specific queries to ensure your business remains on the right side of tax laws.


Finding your UTR after Registration

If you enrolled for the Corporation Tax online service, you can find your 10-digit UTR in HMRC online services. You can also find it in all letters from HMRC. You'll need your UTR if you contact HMRC about Corporation Tax or send your Company Tax Return using commercial software.


Registration Forms

The primary form used for registering for Corporation Tax is the CT600 (2023) Version 3 form. This form is used for accounting periods starting on or after 1 April 2015​.

Several supplementary pages may also be relevant depending on the company's circumstances, including:



  • CT600A (2015) Version 3: for close company loans and arrangements to confer benefits on participators

  • CT600B (2022) Version 3: for controlled foreign companies, foreign permanent establishment exemptions, hybrid and other mismatches

  • CT600C (2018) Version 3: for group and consortium relief

  • CT600D (2015) Version 3: for insurance

  • CT600E (2015) Version 3: for Charities and Community Amateur Sport Clubs (CASCs)

  • CT600F (2023) Version 3: for Tonnage Tax

  • CT600H (2015) Version 3: for cross-border Royalties

  • CT600I (2019) Version 3: for supplementary charge in respect of ring fence trades

  • CT600J (2015) Version 3: for disclosure of tax avoidance schemes

  • CT600K (2017) Version 3: for Restitution Tax

  • CT600L (2022) Version 3: for Corporation Tax: research and development

  • CT600M (2022) Version 3: for Freeports

  • CT600N (2023) version 3: for Residential Property Developer Tax​2​.


Additionally, the Company Tax Return guide (CT600 Guide (2023) Version 3) can be used to help complete the CT600 (2023) Company Tax Return form. The Budget changes (CT600 Budget Insert) form provides an overview of the main Budget changes affecting Corporation Tax.


Professional Assistance Corporation Tax Registration


How and When to Register for Corporation Tax in the UK: Detailed Procedures and Compliance


Calculating Corporation Tax Liability

Once registered for Corporation Tax, understanding how to calculate your tax liability becomes the next crucial step. The tax is calculated on the profits your business makes, including trading profits, investment profits, and any chargeable gains. For UK-based companies, this encompasses all profits, both from the UK and abroad. However, foreign companies with a UK branch or office are taxed only on their UK earnings.


Accounting Period Adjustments

The Corporation Tax accounting period is typically aligned with your business's financial year, which is the 12-month period covered by your annual accounts. However, if your company’s operations commence or cease partway through a year, or if there are other significant changes, you may need to adjust your accounting period. This could result in having more than one accounting period in a year, particularly in your company's first year of trading if it starts trading partway through the year. Consequently, you may need to file more than one tax return and calculate Corporation Tax for each period separately.


Detailed Record-Keeping

Maintaining detailed records is not only a requirement for Corporation Tax compliance but is also fundamental for accurate tax calculations and financial planning. This includes keeping comprehensive records of all income, expenses, assets, and liabilities. Specifically, companies must retain documents such as invoices, receipts, bank statements, and accounting ledgers. These records are essential for preparing your Company Tax Return and supporting any figures reported to HMRC​​.


Utilizing Tax Reliefs and Allowances

A key aspect of managing your Corporation Tax effectively is understanding and utilizing available tax reliefs and allowances. These can significantly reduce your taxable profits and, hence, your Corporation Tax liability. Some common reliefs include Research and Development (R&D) tax credits, Capital Allowances on business assets, and Disincorporation Relief. It’s crucial to identify which reliefs your business is eligible for and to apply them correctly when calculating your tax liability​​.


Paying Corporation Tax

Paying Corporation Tax requires careful attention to deadlines and payment methods. The tax must be paid electronically to HMRC, typically nine months and one day after the end of your accounting period. It's important to plan ahead to ensure timely payment, as late payments can incur interest and penalties. Various payment options are available, including direct debit, online or telephone banking, and payment by debit or corporate credit card. Each method has its processing time, which should be considered to ensure that HMRC receives the payment by the deadline​​.


Dealing with Adjustments and Amendments

After filing your Company Tax Return, you may need to make adjustments or amendments, either because of errors discovered or changes in your financial situation. HMRC allows adjustments to be made within 12 months of the statutory filing date. If you find errors after this period, you must follow HMRC’s error correction procedures. It’s important to address any inaccuracies promptly to avoid potential penalties and interest on underpaid tax​​.


Effectively managing Corporation Tax involves a thorough understanding of registration requirements, tax calculation, record-keeping, and payment procedures. Leveraging tax reliefs and ensuring compliance with HMRC guidelines are fundamental to optimizing your tax position and supporting the financial health of your business. As Corporation Tax regulations can be complex and subject to change, consider consulting with a tax professional to navigate the nuances of tax planning and compliance effectively.



Advanced Strategies for Managing Corporation Tax


Strategic Tax Planning

Advanced tax planning involves a proactive approach to minimize Corporation Tax liability while ensuring compliance with HMRC regulations. Strategic planning can include timing the acquisition and disposal of assets to maximize tax reliefs, choosing the optimal time for significant expenses or income recognition to benefit from lower tax rates, and structuring the business in a way that optimizes tax efficiency. It's essential to align tax planning strategies with your business goals and the current tax laws and regulations​​.


Utilizing Losses

Understanding how to effectively utilize business losses can significantly impact your Corporation Tax. Losses can often be carried forward to offset against future profits, reducing future tax liabilities. In some cases, losses can also be carried back to previous tax years, resulting in a tax refund from HMRC. The rules surrounding the utilization of losses are specific, so careful planning and consultation with a tax professional can ensure that losses are used in the most beneficial way​​​​.


Research and Development (R&D) Tax Credits

For businesses involved in innovative projects, R&D tax credits offer a valuable opportunity to reduce Corporation Tax. These credits allow companies to claim a deduction for eligible research and development expenses, which can significantly reduce the tax payable or even result in a cash refund from HMRC for loss-making companies. Ensuring that you accurately identify and claim for all eligible R&D activities is crucial to maximizing your entitlement.


Dealing with HMRC Investigations

An HMRC investigation into your Corporation Tax affairs can be daunting. Such investigations are typically initiated if HMRC suspects discrepancies or errors in tax returns or accounts. Preparing for potential investigations involves maintaining meticulous records, being transparent in your tax filings, and having a clear understanding of tax laws and regulations. If faced with an investigation, it's advisable to seek professional advice to navigate the process effectively.


Ensuring Long-Term Compliance

Long-term compliance with Corporation Tax obligations requires staying informed about changes in tax legislation and understanding how these changes impact your business. Regularly reviewing your tax affairs, keeping accurate and up-to-date records, and consulting with tax professionals can help ensure that your business remains compliant. Additionally, adopting digital tools for accounting and tax filing can streamline processes and reduce the risk of errors​​.


Effective Corporation Tax management is crucial for the financial health and compliance of your business in the UK. By engaging in advanced tax planning, utilizing losses appropriately, claiming R&D tax credits, preparing for HMRC investigations, and ensuring long-term compliance, businesses can navigate the complexities of Corporation Tax. Staying proactive, informed, and consulting with tax professionals are key strategies to achieving tax efficiency and compliance, supporting your business's growth and success in the long term.



The Importance of Professional Assistance

Registering for corporation tax in the UK can seem like an overwhelming process, especially for first-time business owners. The task involves various legal requirements, paperwork, and important deadlines, leaving room for error if not handled properly. That's where a professional tax accountant, such as Pro Tax Accountant, comes in. Leveraging their extensive experience and up-to-date knowledge, they can streamline the process, ensuring that your business complies with all relevant regulations.


Understanding the Importance of Corporation Tax Registration: A Brief Overview

In the UK, registering for corporation tax is a legal requirement for all limited companies and foreign companies with a UK branch or office. It is the tax on the profits your company makes and needs to be paid even if your company is not actively trading. This registration must occur within three months of starting any business activity.

Pro Tax Accountant can help your business understand these obligations. They provide clear, straightforward advice to ensure you know when and how to register for corporation tax, eliminating any confusion.


The Role of Pro Tax Accountant in Registering for Corporation Tax


1. Timely Registration

Pro Tax Accountant ensures that your company is registered for corporation tax within the legal timeframe. They understand the consequences of late registration, such as penalties, and strive to avoid these unnecessary costs.


2. Accurate Paperwork

Registering for corporation tax involves several forms and documents. Pro Tax Accountant ensures that these are filled out accurately and completely, helping to prevent delays or issues with HM Revenue and Customs (HMRC).


3. Expert Advice

Pro Tax Accountant's expertise extends beyond just the registration process. They can provide advice on how to minimize tax liability within the bounds of the law, helping you keep more of your hard-earned profits.


4. Regular Updates

Tax laws and regulations can change frequently. Pro Tax Accountant stays abreast of these changes, ensuring that your business remains compliant at all times.


5. Peace of Mind

Knowing that a professional is handling your tax matters can provide significant peace of mind. Pro Tax Accountant lets you focus on running your business, while they take care of the tax side of things.


The Benefits of a Pro Tax Accountant like “Pro Tax Accountant”


Saves Time and Money

The time you would spend trying to understand tax laws and filling out forms can be better spent on other aspects of your business. Pro Tax Accountant takes over this burden, allowing you to concentrate on growth and profitability. Moreover, their expertise in tax minimization strategies could result in significant savings over time.


Avoidance of Penalties

Filing late or incorrect returns can lead to severe penalties from HMRC. By ensuring that all returns are filed accurately and on time, Pro Tax Accountant helps you avoid these penalties, protecting your bottom line.


Compliance Assurance

Remaining compliant with tax laws and regulations can be a challenge, especially for new or rapidly growing businesses. Pro Tax Accountant monitors these laws and regulations, ensuring your business stays compliant, thereby avoiding legal issues.


A Worthwhile Investment

In conclusion, hiring a professional tax accountant like Pro Tax Accountant to help with corporation tax registration in the UK is a wise business decision. Their extensive expertise, attention to detail, and proactive approach can save your company time and money while ensuring compliance with all relevant tax laws and regulations. Give your business the best chance of success by trusting your tax matters to the professionals.



20 Most Important FAQs on Corporation Tax in the UK


Q1: What is Corporation Tax?

A: Corporation Tax is a tax on the taxable profits of limited companies and other organisations, including clubs, societies, and unincorporated associations.


Q2: Who needs to pay Corporation Tax?

A: Any limited company, foreign company with a UK branch or office, and unincorporated associations like clubs or societies operating in the UK must pay Corporation Tax.


Q3: How do I know if my business is liable for Corporation Tax?

A: If your business is incorporated as a limited company in the UK, it is liable for Corporation Tax on its profits. This also applies to foreign companies with a UK branch or office.


Q4: What are the current rates for Corporation Tax?

A: The standard rate for Corporation Tax is 19% for all companies, but this can change, so it's best to check the latest rates on the HMRC website or consult a tax advisor.


Q5: How is Corporation Tax calculated?

A: Corporation Tax is calculated on your company's profits, including trading profits, investment profits, and chargeable gains.


Q6: What expenses can be deducted from Corporation Tax?

A: Businesses can deduct costs that are exclusively for business purposes, including operating expenses, salaries, and business rates, among others.


Q7: What are the deadlines for paying Corporation Tax?

A: Corporation Tax must be paid nine months and one day after the end of your accounting period.


Q8: How do I register for Corporation Tax?

A: You must register for Corporation Tax within three months of starting business activities by contacting HMRC and providing the necessary details.


Q9: Can I file my Corporation Tax Return online?

A: Yes, Corporation Tax Returns must be filed online through the HMRC website using your Government Gateway account.


Q10: What happens if I file my Corporation Tax Return late?

A: Late filing can result in penalties and interest charges on the unpaid tax.


Q11: Can I carry forward or back losses for Corporation Tax?

A: Yes, losses can be carried forward to offset against future profits or carried back to previous years, subject to certain conditions.


Q12: Are there any reliefs available that can reduce my Corporation Tax bill?

A: Yes, there are several reliefs available, including R&D tax credits, Capital Allowances, and Creative Industry reliefs.


Q13: What records do I need to keep for Corporation Tax purposes?

A: You must keep all financial records related to your business, including sales and expenses, payroll records, and invoices, for at least 6 years.


Q14: How can I pay my Corporation Tax bill?

A: Corporation Tax payments can be made online through the HMRC website, by bank transfer, or using a debit or credit card.


Q15: What is an accounting period for Corporation Tax?

A: An accounting period is usually your financial year and is the period over which you calculate your taxable profits.


Q16: Can I change my company's accounting period for Corporation Tax?

A: Yes, you can change your accounting period, but you must notify HMRC and there may be implications for your Corporation Tax.


Q17: What if my company is dormant? Do I still need to pay Corporation Tax?

A: Dormant companies do not usually have to pay Corporation Tax, but you must inform HMRC that your company is dormant.


Q18: What is the penalty for not registering for Corporation Tax?

A: Failure to register for Corporation Tax can result in penalties and interest charges on any unpaid tax.


Q19: How can I reduce my Corporation Tax liability legally?

A: Utilizing available deductions, reliefs, and allowances, such as R&D credits or Capital Allowances, can legally reduce your Corporation Tax liability.


Q20: What should I do if I disagree with my Corporation Tax calculation?

A: If you disagree with your Corporation Tax calculation, you can appeal to HMRC, providing evidence to support your case. It's advisable to seek professional advice when appealing.


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