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.
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:
9 months and 1 day after the end of your accounting period (for profits under £1.5m)
12 months after the end of the accounting period it covers
Click "Start Now" at the top right of the webpage, then fill in and submit the sign-up form.
You'll receive an account activation link by email - click it to activate your account.
Send us your financial statements in PDF, Excel or Word - or ask us to prepare the iXBRL accounts for you first.
Provide adjustments, allowances and reliefs so we can prepare an accurate CT600 tax computation.
You'll receive an email alert when your CT600 form and tax computation are ready to check.
If you require any amendments or a further review, we will do it at no additional cost.
Once you approve the CT600, we file it electronically to HMRC together with your iXBRL accounts and computation.
We email you the acknowledgement copy confirming HMRC has successfully received your CT600.
Headed by an expert who developed the iXBRL and CT600 filing solutions behind some of the world’s earliest iXBRL reports submitted to HMRC.
In the rare instance you’re not delighted with our service, we refund fully. No questions asked.
Whether you need your CT600 filed within hours or weeks ahead of your deadline, our process flexes to meet it.
“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 TrustpilotFull client references available on request. Read all our verified reviews on Trustpilot →
iXBRL conversion is the process of transforming your financial statements into Inline XBRL (iXBRL) format by applying the correct taxonomy tags. The converted file can then be submitted to HMRC as part of your Corporation Tax Return (CT600).
Any UK company filing Corporation Tax returns with HMRC must submit its statutory accounts and tax computations in iXBRL format. If your accounting software cannot generate compliant iXBRL files, a professional conversion service is required.
You can upload your financial statements in PDF, Microsoft Excel (XLS/XLSX), Microsoft Word (DOC/DOCX), or other commonly used accounting report formats. Our team converts them into HMRC-compliant iXBRL files.
Most iXBRL conversions are completed within 24 to 48 hours. Urgent same-day services may also be available for companies with approaching filing deadlines.
Once the conversion is complete, we securely deliver your validated iXBRL accounts and tax computation files by email or through our secure client portal, ready for submission.
Our primary service is iXBRL tagging and conversion. If required, we can also assist with preparing and filing your CT600 Corporation Tax Return using compatible HMRC filing software.
If your submission is rejected due to an iXBRL tagging issue within our scope of work, we review the rejection, make the necessary corrections, and provide an updated iXBRL file at no additional cost.
Yes. We convert both standalone and consolidated financial statements while ensuring the correct taxonomy mapping and validation for each entity.
Yes. All client information is handled confidentially using secure data transfer methods and strict internal security procedures. Your financial documents are never shared with third parties.
No. Simply send us your financial statements, and our team will review your documents, provide a quotation, and begin the conversion once approved.
Pricing depends on the complexity of your financial statements, the reporting framework, and the number of disclosures requiring tagging. Contact us for a free quotation with no obligation.
Yes. We regularly work with accountants, tax advisers, and corporate groups managing multiple entities. Volume pricing and dedicated account management are available.
