iXBRL tagging services for CT600 filing
HMRC-ready iXBRL for every return, without in-house effort.
Send us your accounts and tax computations. Our experts tag them, validate them with HMRC, and file your CT600, or hand back files ready to submit.
iXBRL tagging services for CT600 filing
HMRC-ready iXBRL for every return, without in-house effort.
Send us your accounts and tax computations. Our experts tag them, validate them with HMRC, and file your CT600, or hand back files ready to submit.
600+
Accounting firms
450,000+
Tagged outputs
HMRC-recognised
Tagging provider
ISO 27001
Independently audited SOC 2 Type II report
Who it's for
Built for the people who file with HMRC every day
01
In-house finance teams
Audited or complex accounts tagged accurately, so your team stays on the close, not the taxonomy.
02
Groups and specialist entities
Charities, IFRS reporters and multi-company groups, tagged consistently across every entity.
03
Accounting firms
Outsource iXBRL tagging for every client return, with volume handled and deadlines met.
Filing a simple micro-entity return yourself?
Prepare and file your CT600 online with DataTracks Nova.
What we tag
Everything your CT600 needs in iXBRL
HMRC requires your accounts and your tax computations in iXBRL. We tag both against the right taxonomy.
Statutory accounts
Full, small, micro-entity and dormant accounts, tagged line by line.
Corporation Tax computations
Tagged to HMRC’s UK-CT taxonomy.
All UK accounting taxonomies
FRS 102, FRS 105, IFRS and charities, matched to how your accounts are prepared.
Group accounts
Every company in the group tagged consistently, in one batch.
What we tag
From your accounts to an accepted return, in four steps
1
You send your accounts
Upload your accounts and tax computations as PDF, Word or Excel, with your filing deadline.
2
Our experts tag every figure
Our financial team tags each line of your accounts and computations.
3
We validate it with HMRC
The tagged file is pre-validated with the HMRC gateway before it reaches you.
4
We file it, or you do
Choose for each return.
We submit to HMRC
You file in your software
Why choose DataTracks for iXBRL tagging
Tagged by financial experts
Our own team of financial experts tags every file.
Always on the current taxonomy
Our tagging engine is kept up to date with every taxonomy release.
Free revisions until accepted
Any change you need, at no extra cost, until HMRC accepts the return.
One named account manager
A single contact who knows your returns and your deadlines.
Turnaround
Turnaround that fits your deadline
24 hrs
1-day window
Dormant and simple micro-entity accounts.
72 hrs
3-day window
Standard small company accounts with tax computations.
240 hrs
10-day window
Complex, audited, group or multi-entity filings.
Tell us your filing deadline, and we’ll plan the work backwards from it. Quotes are tailored to your volume, with volume terms for accounting firms.
Managed service or Nova?
Two ways to file with DataTracks
| Managed tagging service | DataTracks Nova | |
|---|---|---|
| Service model | Done for you | Do it yourself |
| Best for | Accounting firms, audited and complex companies, groups | Micro-entities filing for themselves |
| Who does the work | Our experts tag, review and validate | You enter your figures, and Nova guides you |
| Accounts covered | Full, small, micro, dormant, group, charities, IFRS | Micro-entity accounts |
| Filing | We file your CT600, or you file with our files | You file your CT600 from Nova |
| Next step | Get a quote ↗ | Explore Nova ↗ |
1 April 2028 / Companies House software-only filing
Tag once, file with HMRC and Companies House
From 1 April 2028, Companies House will accept annual accounts only through commercial software, in iXBRL. Web and paper filing for accounts will close.
Small companies and micro-entities will also have to file a profit and loss account, with the option not to publish it.
The accounts we tag for HMRC are already in iXBRL. Use the same file for Companies House, with no second round of tagging.
See Companies House filing ↗
Recognition
Recognised by HMRC, trusted by firms
HMRC-recognised
provider
DataTracks (DTracks Limited) is recognised by HMRC as an iXBRL Managed Tagging Service provider. View the government listing ↗
Reporting
expertise
Regulatory reporting expertise backed by recognised quality, information security and XBRL credentials.
Trusted by industry leaders
Enterprise-Grade Security
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What is an iXBRL managed tagging service?
You send us your accounts and tax computations, and our experts convert them into iXBRL, the format HMRC requires for every CT600. We tag, review and validate, so your team doesn’t have to learn taxonomies or software.
Do you file the CT600 for us, or just tag the files?
Both. We can submit your CT600 to HMRC for you, or hand back validated iXBRL files to file in your own software. You choose per filing.
How long does iXBRL tagging take?
Most returns fall into one of three windows: 24 hours for dormant and simple micro-entity accounts, 72 hours for standard small company accounts with computations, and 240 hours for complex, group or multi-entity filings.
What happens if HMRC rejects the file?
Every file is pre-validated with the HMRC gateway before delivery, so rejections are rare. If one happens, we fix it at no extra cost until the filing is accepted.
I used CATO. Should I use this service or Nova?
If you’re a micro-entity filing for yourself, Nova lets you prepare and file your CT600 online. If you’d rather hand the work over, or your accounts are more complex, use our managed tagging service.
How much does iXBRL tagging cost?
Pricing depends on your volume and the complexity of your accounts. Request a quote, and we’ll come back with a tailored price.
Let's get your filing ready
Send us your next set of accounts
Get a tailored quote for your next CT600 filing.
