From 1 April 2026, HMRC no longer accepts Company Tax Returns through its free CATO service. Every company must now file its CT600 and iXBRL accounts using commercial software - or through a recognised agent like FinTags.
No software to buy. No iXBRL to learn. Send us your accounts; we tag them, prepare your CT600, and file with HMRC as your authorised agent.
Full tagging of your statutory accounts to the correct HMRC / Companies House taxonomy - FRS 101, FRS 102, IFRS and micro-entity.
We prepare and transmit your Company Tax Return as your authorised agent, with amendments at no extra cost.
We prepare and file your annual accounts with Companies House as your authorised agent - filing starts from £30, including new and dormant companies.
Create your account online and add entity information
Financial statements in Excel, Word or PDF format
Package when available, as scheduled. Review and approve.
If you need, we transmit CT600 to HMRC on your behalf
Dedicated support manager. Volume discounts. Support after business hours. Invoiced monthly.
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Dedicated Support Manager. 15% off list price for Group companies. Support after business hours.
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Free XBRL service for qualified entity. Any number of revisions till successful filing with HMRC.
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Free XBRL service for qualified entity. Any number of revisions till successful filing with HMRC.
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Free XBRL service for qualified entity. Any number of revisions till successful filing with HMRC.
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Free XBRL service for qualified entity. Any number of revisions till successful filing with HMRC.
Know moreThe simplest way to file for a company with no trading activity or in its first year.
Full iXBRL tagging of your financial statements and tax computations, to the correct HMRC taxonomy.
We prepare and transmit your Company Tax Return to HMRC as your authorised agent.
“I have been with FinTags for a number of years and can honestly say I could not find a better service. Highly recommended!”
“The team consistently delivers on time, and their quick turnaround makes the process seamless. Service has always been exceptional.”
“The team was most helpful and ensured that all aspects of the transaction were managed to a successful conclusion.”
FinTags is headed by the expert behind some of the world’s earliest iXBRL reports submitted to HMRC, with teams that built XBRL solutions for SEC, MCA, COREP and Solvency II.
Work with us, and you’ll work with passionate professionals - vigilant of deadlines, and committed to exceeding client expectations.
It is immensely rewarding when our customers spontaneously appreciate our service and are already thinking of us at the next opportunity. That is the kind of delightful experience we strive to create with every customer.
“All tax returns submitted successfully. A fantastic job turning this work around so quickly with very little notice - I look forward to working with you again.”
Customer FeedbackiXBRL (Inline eXtensible Business Reporting Language) tags every figure in a set of accounts so it can be read automatically by HMRC and Companies House systems. HMRC has required Company Tax Returns and statutory accounts to be filed in iXBRL format since 2011.
iXBRL tagging costs from £4 per page, with the same price for Word, Excel or PDF source files. New and dormant company filings start from £30 as a flat package, and HMRC CT600 filing is £60.
HMRC's free Company Accounts and Tax Online (CATO) service closed to new Company Tax Returns on 31 March 2026. From 1 April 2026, all CT600s and iXBRL accounts must be filed using commercial software or a recognised filing agent such as FinTags.
Yes. FinTags offers a 100% HMRC acceptance guarantee with unlimited revisions until your filing is accepted — at no extra cost.
Word, Excel and PDF are all accepted at the same price — send your accounts exactly as you have them, and we handle the iXBRL conversion.
Standard turnaround is 7 days; an express 3-day service is also available for urgent HMRC and Companies House deadlines.
