Ct600 2026

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The document is the Company Tax Return CT600 (2015) Version 3, which outlines the requirements for companies to file their tax returns for accounting periods starting on or after April 1, 2015. It details the necessary information and forms needed for submission, including company details, income calculations, deductions, and tax liabilities. The document emphasizes compliance with filing deadlines to avoid penalties and provides guidance on how to complete the return accurately.

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Click ‘Get Form’ to open the CT600 in the editor.
Begin by entering your company information, including the company name, registration number, and tax reference in the designated fields.
Specify the accounting period for which you are filing by filling in the 'from' and 'to' dates.
Indicate any relevant boxes regarding repayments, claims, or estimated figures as applicable to your return.
Complete the income section by entering figures for trading profits, losses, and other income sources as required.
Proceed to fill out deductions and reliefs based on your company's financial activities during the period.
Finally, review all entries for accuracy before submitting your completed form through our platform.

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Versions	Form popularity	Fillable & printable
2023	4.3 Satisfied (56 Votes)
2021	4.8 Satisfied (120 Votes)
2020	4.4 Satisfied (211 Votes)
2018	4.3 Satisfied (284 Votes)
2015	4.4 Satisfied (279 Votes)
2008	4.3 Satisfied (172 Votes)

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When to file CT600?

HMRC require a Corporation Tax return (CT600) after the end of the accounting period. But as a CT600 can only report up to a maximum of 12 months, so you will need to file online two CT600s.

Who is exempt from Corporation Tax?

Charities are usually exempt from paying corporation or income tax. But there are some situations where you might need to pay tax.

What are CT600 filing deadlines?

So, if your accounting year ends on 31 October 2025, your Corporation Tax bill must be paid by 1 August 2025 and the return completed by 31 October 2026. Missing this payment deadline can result in interest charges from HMRC, separate from any filing penalties for a late CT600.

Who needs to file CT600?

Every business thats registered in the UK with Companies House must submit a CT600 form every year as part of a Company Tax Return. Organisations that must complete the return include: Limited companies registered in the UK. Foreign companies with a UK branch or office.

What is the CT600?

Use this service to file your company or associations: Company Tax Return (CT600) for Corporation Tax with HM Revenue and Customs ( HMRC ) accounts with Companies House. Company Tax Return and accounts at the same time if theyre for the same accounting period.

ct600 form

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Who needs to complete a CT600?

All companies registered in the UK with Companies House need to file a CT600 annually. Why? So that HMRC knows how much corporation tax youll need to pay on your profits. This includes limited companies, public limited companies (PLCs), and certain clubs, societies and associations that are liable for corporation tax.

Is there CT600 filing software?

The CT600 Corporation Tax software includes CT600 and relevant supplementary forms as listed on the Features page. Data entry forms within the software are similar to HMRC forms, with some small variations, thus simplifying the form filling exercise.

What is a CT600?

A CT600 form is part of a Company Tax Return. The form and other supporting documents constitute the Company Tax Return, which must be submitted to HMRC if a company receives a Notice to Deliver a Company Tax Return. Limited companies use the information in a CT600 form to calculate the Corporation Tax that they owe.