CT600 Company Tax Return Forms HMRC 2025

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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.
The CT603 is simply a notice from HMRC to request the filing of your CT600 (corporation tax for your company tax return). Its HMRCs way of saying: Its time to get your tax affairs in order. So, when you receive a CT603 notice, its time to prepare your CT600 form for submission.
More In File You can access your personal tax records online or by mail, including transcripts of past tax returns, tax account information, wage and income statements, and verification of non-filing letters. If you need a transcript for your business, find out how to get a business tax transcript.
Complete business entity transcript Eligible business owners can get it through their business tax account or IRS business line. Third parties with authorization to receive entity information can get it through the Practitioner Priority Service Line by submitting Form 2848 or Form 8821.
To get a complete copy of a previously filed tax return, along with all attachments (including Form W-2), submit Form 4506, Request for Copy of Tax Return. Refer to the form for instructions and for the processing fee.
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The software does allow you to attach PDF files for other supporting documents you may want to send to HMRC but not accounts and computations. Attachments must be in valid Portable Document Format (PDF) acceptable by HMRC.
You may contact the Corporation Tax Helpline on 03002003410 and request a hard copy be issued to you by post.
You can request your Corporation Tax UTR online. HMRC will send it to the business address thats registered with Companies House.

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