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CT600 Filing Service

How CT600 company tax return filing works

We prepare and submit your Company Tax Return (CT600) together with iXBRL-tagged accounts and computations, filed directly with HMRC. From uploading your figures to a filed return with HMRC acknowledgement - four simple steps, start to finish.

CT600 Preparation Tax Computations Direct HMRC Submission iXBRL Included
Accountant preparing a CT600 company tax return
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What is a CT600 Company Tax Return?

Form CT600 is the Company Tax Return that details the Corporation Tax payable to HMRC. It consists of a completed CT600 form plus the accounts, computations, statements and reports the company has prepared. The online submission pack filed through the Government Gateway must include:

  • Corporation Tax Return form (CT600) in XML
  • Corporation Tax computation in iXBRL
  • Statutory annual accounts of the legal entity in iXBRL
  • Other supporting schedules in PDF, where applicable

Corporation Tax Deadline

9 months and 1 day after the end of your accounting period (for profits under £1.5m)

Company Tax Return Deadline

12 months after the end of the accounting period it covers

Step 1. Set up your online account

  • Create your online account

    Click "Start Now" at the top right of the webpage, then fill in and submit the sign-up form.

  • Confirm your account

    You'll receive an account activation link by email - click it to activate your account.




Step 2. Submit your accounts & computations

  • Upload your statutory accounts

    Send us your financial statements in PDF, Excel or Word - or ask us to prepare the iXBRL accounts for you first.

  • Share your tax computation details

    Provide adjustments, allowances and reliefs so we can prepare an accurate CT600 tax computation.




Step 3. Review your CT600 & computation

  • Download and review your draft return

    You'll receive an email alert when your CT600 form and tax computation are ready to check.

  • Amendments

    If you require any amendments or a further review, we will do it at no additional cost.




Step 4. Filing with HMRC

  • Approve & we submit to HMRC

    Once you approve the CT600, we file it electronically to HMRC together with your iXBRL accounts and computation.

  • HMRC acknowledgement

    We email you the acknowledgement copy confirming HMRC has successfully received your CT600.



Important - Accounting Firms & Group Companies
Add multiple entities to one account, and get a dedicated support manager plus volume discounts as you scale. Talk to us about your volume →
Why Us

Not just high quality or best price - it’s about the experience

Expertise - a decade of experience

Headed by an expert who developed the iXBRL and CT600 filing solutions behind some of the world’s earliest iXBRL reports submitted to HMRC.

Customer delight - else refund

In the rare instance you’re not delighted with our service, we refund fully. No questions asked.

Flexible process - fast turnaround

Whether you need your CT600 filed within hours or weeks ahead of your deadline, our process flexes to meet it.

What Our Customers Say

Rated Excellent by our customers on Trustpilot

Trustpilot 4.6 · 19 reviews

“Our CT600 and computation were filed well ahead of deadline - couldn’t have been simpler.”

Verified reviewer · via Trustpilot

“Thank you for submitting this - and for such a prompt turnaround.”

Verified reviewer · via Trustpilot

“I really appreciate it! You most certainly have shown me a great customer service.”

Verified reviewer · via Trustpilot

Full client references available on request. Read all our verified reviews on Trustpilot →

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Frequently Asked Questions

Questions about the process

Yes, FinTags is an HMRC-authorised filing agent and can submit your Corporation Tax return on your behalf, from £60.

No amendments to a filed CT600 are included at no additional cost.

Yes FinTags is authorised to file CT600 returns directly with HMRC on clients' behalf.

From £60 per return, with amendments included free.

Yes Companies House filing is available from £30.

Your tagged accounts, Corporation Tax computation and any supporting schedules.