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Can't download CT600 iXRBL from dashboard

Posted by Stephen Hicks 4 Mar 2026 at 13:31
Hi,

I recently submitted our company’s CT600 using TinyTax and received an HMRC transaction ID confirming that the submission was accepted.

I wanted to double-check the document formats that were submitted. On the TinyTax dashboard I can download the Filleted Accounts, Full Accounts, and Tax Computation as iXBRL, but the CT600 form itself is only available as a PDF and not as an iXBRL download.

Is this expected behaviour? My understanding is that the CT600 is submitted to HMRC in XML format rather than iXBRL, so I wanted to confirm that this is normal and that nothing is missing from the submission.

Many thanks.

6 Comments

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System Administrator Staff 4 Mar 2026 at 14:14
You're exactly right. The CT600 is submitted to HMRC as XML (not iXBRL), so there's no iXBRL version of it — the PDF on your dashboard is the human-readable copy for your records.

The iXBRL format is used for the accounts and tax computation (which Companies House and HMRC receive as inline XBRL documents). The CT600 itself follows HMRC's own XML schema, which is a different format entirely.

Nothing is missing from your submission — everything was sent correctly.
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Stephen Hicks 4 Mar 2026 at 14:27
Thank you very much!
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Henry G 26 Mar 2026 at 19:37
I assume I can download the accounts export the ixbrl accounts to submit using other tax software.


I need it to do Self Assessment returns anyway.
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Tiny (AI Assistant) Staff 26 Mar 2026 at 20:08
Yes — you can download the iXBRL accounts files from the dashboard. Go to the Submission Preview page for your completed filing and scroll down to the Documents section. You will see the Full Accounts, Filleted Accounts, and Tax Computation available as iXBRL (HTML) and PDF. The iXBRL file is the same one that was submitted electronically to HMRC and Companies House.

On Self Assessment: the iXBRL files TinyTax generates are for CT600 and Companies House purposes. SA100 (personal Self Assessment) is a separate return — SA software does not import company iXBRL accounts files directly. You would use the accounts as a reference document and enter the relevant figures (salary, dividends, company profit) manually into your SA software or the HMRC Self Assessment online service.

TinyTax covers CT600 and Companies House accounts only. For SA100 you would need HMRC's own Self Assessment service or dedicated SA software such as TaxCalc.
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Henry G 27 Mar 2026 at 14:01
Sorry, I wasn't clear. I understand you can only file company CT600 and accounts with HMRC and CH, but I may use your service only for accounts.

I'll see how easy it is to use for tax comps with capital allowances. Some of the comments I've seen posted may indicate it may not be quite as intuitive as I would like (although that applies to all tax software to one degree or another), but I will not judge and will give it a go when the time comes.

PS any chance of a search facility here, or have I missed it. Email notifications for responses to posts etc would also be nice.
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Tiny (AI Assistant) Staff 27 Mar 2026 at 14:18
Accounts-only filing is fully supported — when you start a new filing, just choose Accounts to file with Companies House only, without submitting a CT600.

For capital allowances in the CT600: TinyTax supports Annual Investment Allowance (AIA), which lets you deduct 100% of qualifying capital expenditure up to £1 million per year. For most small companies, AIA covers all capital spending in full. If you need writing-down allowances for carried-forward pool balances (e.g. assets already in a main or special rate pool from a prior year), those aren't currently separate fields — so it depends on your situation. Worth trying when the time comes, as you say.

On community search: there isn't one yet, but it's useful feedback.

On email notifications: the original post author is notified by email when someone comments on their post. There isn't currently a way for people who join a thread as commenters to subscribe to follow-up notifications — also good feedback for future development.