CT and iXBRL Accounts E-filing for HMRC
Seamless, secure, and compliant electronic filing for your corporation tax returns.
Integrated E-filing Solution
At E-filing Specialist, we offer an integrated E-filing solution which enables you to upload your CT600 (and any supplementary pages), your computations of the Accounts and your accounts and seamlessly converts and bundles them into the required HMRC formats, flagging any errors before final submission.
We provide iXBRL tagging of financial statements and supply the relevant ready-to-use template for you to enter your presenter's credentials. If you don't yet have them, you can apply with Companies House.
What You Must File
To make a valid electronic Corporation Tax return, you need to submit all three of the following simultaneously:
Annual Accounts
Annual Accounts in iXBRL format
Computation
Computation of the Accounts in iXBRL format
CT600 Form
CT600 (and supplements) in HMRC XML format (or CSV that can be converted to XML)
What We Provide
Comprehensive e-filing services to ensure your submissions are accurate, compliant and on time.
iXBRL Tagging
Professional iXBRL tagging of financial statements to HMRC specifications.
Presenter Templates
Ready-to-use templates for entering your presenter's credentials for HMRC submission.
Late Submissions
Support for late or past year submissions when needed.
Amended Returns
Handle amended account or tax return submissions efficiently.
API Integration
Partner and API integrations available, subject to mutual agreement.
E-filing Certificate
Receive proof of filing certificate with timestamp and HMRC markers upon successful submission.
How It Works
Our streamlined process makes HMRC e-filing simple, secure and stress-free.
Upload Your Documents
You upload the three required components (CT600 + supplements, computations, accounts).
Format Conversion
We convert the CT600 from CSV (if needed) into HMRC's XML format.
Real-time Validation
We validate all three documents against HMRC's business rules and check for errors in real time. You'll receive immediate alerts if there are issues, with pointers to where corrections are needed.
Preview & Review
Once everything passes validation, you can preview the combined return (CT + accounts) in PDF form for your final review.
Submit to HMRC
After your final review, click 'Submit' to send the complete package via HMRC's XML submission protocol.
Receive Certificate
On successful submission, you receive a proof of E-filing certificate showing timestamp, what you filed, HMRC markers, etc.
Trusted E-filing Specialists
E-filing Specialist has been providing compliant HMRC e-filing services since 2012, serving over 2,500 accountants, payroll teams and corporate finance departments across the UK.
Our London-based team combines deep technical expertise in iXBRL standards with practical knowledge of Corporation Tax filing requirements, ensuring your submissions are accurate, compliant and on time.
- Over 15,000 successful CT600 submissions
- ISO 27001 certified data security
- Dedicated UK-based support team
- 99.8% first-time acceptance rate
Trusted by Leading UK Businesses
Transparent Pricing
Straightforward pricing with no hidden fees. Volume discounts available for multiple submissions.
CT600 and iXBRL Accounts to HMRC
Volume Discount Available — Contact us for preferential rates on multiple company filings.
Get Started Today
Ready to simplify your HMRC e-filing? Contact our team for a no-obligation consultation.
Send Us a Message
Contact Details
London W2 2HZ
United Kingdom
9:00 AM - 6:00 PM GMT