Corporation tax services

Preparation and submission of your company tax return

Corporation Tax is a legal requirement for all UK limited companies, payable on annual profits. Preparing and filing your Company Tax Return with HMRC can be complex, involving detailed disclosures of income, expenses, loans, and other financial circumstances. Our role is to simplify this process, ensuring your return is accurate, compliant, and submitted on time.

What We Deliver

Preparation & Filing

We handle the complete preparation and submission of your CT600, ensuring accuracy and compliance with HMRC deadlines.

Tax Planning

Strategic advice to optimise your tax position, helping you retain more of your profits while staying compliant.

Compliance Assurance

We keep your business aligned with HMRC requirements, reducing the risk of penalties, interest, or investigations.

Deadline Management

Proactive reminders and support so your corporation tax is paid within nine months and one day of year‑end.

Tailored Reporting

Clear, customised reports that translate complex tax data into insights relevant to your industry and stakeholders.

Ongoing Advisory

Beyond filing, we provide continuous guidance on reliefs, allowances, and regulatory changes that impact your business.

Corporation Tax Return (CT600)

All UK limited companies are required to file a Corporation Tax Return, commonly referred to as the CT600 form, with HMRC within 12 months of the end of their financial year. The process begins by notifying HMRC that your company is subject to corporation tax. From there, you must calculate the profit made during each accounting period and determine the tax payable.

Although the CT600 itself is not due until a year after the accounting period ends, the corporation tax liability must be settled much earlier—within nine months and one day of the year’s close. Missing these deadlines can result in penalties and interest charges

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Penalties for Late Filing

Timely preparation and submission are therefore essential to avoid unnecessary costs and maintain compliance.

Failure to file the CT600 on time can quickly lead to escalating fines:

One day late results in a £100 penalty.
Three months late incurs an additional £100 penalty.
Six months late triggers a further penalty equal to 10% of your estimated corporation tax bill, calculated by HMRC without the right of appeal.
Twelve months late adds another 10% penalty to the estimated bill.

Our Approach

Clarity First

We simplify complex financial and regulatory requirements into clear, actionable insights, ensuring you always understand the numbers behind your business.

Strategic Precision

Every recommendation is tailored to your goals, combining technical expertise with a forward‑looking perspective that positions your company for sustainable growth.

Trusted Partnership

We work alongside you as a reliable advisor, building confidence with directors, shareholders, and stakeholders through transparent reporting and proactive support.

Looking for a complete Corporation Tax Services for your business?

Speak to our specialist today.

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Corporation Tax FAQ

1What is Corporation Tax?

Corporation Tax is a levy on the profits of UK limited companies. It must be calculated and paid to HMRC each year.

2When do I need to file my Corporation Tax Return (CT600)?

The CT600 must be filed within 12 months of the end of your company’s financial year, but the tax itself must be paid within nine months and one day after year‑end.

3What happens if I miss the deadline?

Late filing or payment can result in escalating penalties and interest charges. HMRC may issue fines starting at £100 and increasing to 10% of your estimated tax bill if delays continue.

4Do all businesses pay Corporation Tax?

No. Only UK limited companies are subject to Corporation Tax. Sole traders and partnerships file self‑assessment tax returns instead.

5Can I reduce my Corporation Tax bill?

Yes. With careful planning, you may be able to claim reliefs, allowances, or deductions that lower your liability. Professional advice ensures you take advantage of all available options.

6Do I Need an Accountant?

There is no legal obligation to appoint an accountant to prepare and file your company’s tax return. However, working with a qualified accountant at Filipiak & Co. can make the process far easier, ensuring your return is completed accurately, submitted on time, and free from costly mistakes. Beyond compliance, an accountant can also provide valuable advice on tax planning and business strategy, helping you save time, reduce stress, and focus on running your company.

7How Much Corporation Tax Will I Have to Pay?

From 1 April 2023, Corporation Tax is charged at different rates depending on the level of taxable profit. Companies with profits of £50,000 or less pay the small profits rate of 19%. For companies with profits between £50,000 and £250,000, the main rate of 25% applies, but this is reduced by marginal relief to ensure a gradual increase in tax rather than a sudden jump. Profits above £250,000 are taxed at the full 25% rate. This tiered system means smaller businesses benefit from a lower rate, while larger companies contribute more in line with their profitability. Marginal relief ensures fairness by smoothing the transition between the two thresholds.

8How can we help?

We manage the preparation, filing, and payment process for your Corporation Tax Return, ensuring accuracy, compliance, and peace of mind. Our advisory support also helps you plan ahead to minimise liabilities and avoid penalties.