Why CT600P changed the filing workflow

Creative industry claims are no longer just a note in the computation. HMRC guidance says that if a Company Tax Return is submitted on or after 6 April 2026, the CT600P Creative Industries supplementary page must be included where relevant.

That matters for software and practice review because CT600P separates production-level claim detail, expenditure credit treatment, amounts used against liabilities, group surrender, and payable credit amounts. The return needs to reconcile with both the computation and the additional information submitted for the claim.

Claims that need a payable-credit review

Creative industry claims can involve Audio-Visual Expenditure Credit, Video Games Expenditure Credit, theatre, orchestra, museums and galleries, and other qualifying production categories depending on the accounting period and claim type. The common workflow question is: what happens after the credit is calculated?

A payable-credit review should identify the amount due to the company, the amount used to discharge Corporation Tax or other liabilities, any amount surrendered to group companies, and the balance expected as a payable credit. Those figures need to agree across CT600P, the main CT600, and the working papers.

Additional information is not optional admin

HMRC's creative industry guidance says claimants must submit an additional information form as evidence for creative industry tax relief claims. For a practice, that is a filing dependency, not a nice-to-have attachment.

Before approving the CT600, check that the additional information matches the production list, qualifying expenditure, credit calculation, and CT600P amounts. If the return package is API-led or prepared with AI assistance, the review step should still force a human-readable evidence pack before submission.

What to check before filing CT600P

Which production or projects the claim covers, and whether each is in the correct creative category.
Whether the company is the relevant production company for the claim being made.
Qualifying expenditure, excluded expenditure, and the credit calculation method used.
Amounts set against Corporation Tax and other liabilities before any payable credit is expected.
Any group surrender or restriction that changes the amount repayable to the company.
Additional information form status and supporting evidence for each production.
Client approval of the claim, not only approval of the final tax payable figure.

Common practice traps

The most common error is treating the payable credit as a single refund expectation. In reality, HMRC's expenditure-credit guidance expects teams to work through the set-off and redemption steps. The client may see a headline credit, but the filed return may use part of that amount against liabilities before a payment is due.

Another trap is version control. If the additional information is updated after manager review, the CT600P page and Corporation Tax computation need another check. A mismatch between claim evidence and filed figures weakens the audit trail even when the arithmetic is close.

How Robocount supports CT600P work

Robocount is built for CT600 preparation, review, validation, and filing. For CT600P, the important product principle is structured review: supplementary-page detail should sit beside the main return, computation, iXBRL attachments, approval evidence, and Government Gateway submission record.

Keeps CT600P visible as a supplementary-page review item rather than burying it in notes.
Supports production-level evidence checks for creative industry claims.
Helps reviewers compare payable-credit figures with the main CT600 and computation.
Fits accountant-led and API-led workflows where claim data is assembled before human approval.
Gives clients clearer expectations around set-off, surrender, and payable-credit outcomes.

FAQ

When is CT600P required?

HMRC guidance says that where a relevant creative industry claim is made and the Company Tax Return is submitted on or after 6 April 2026, CT600P must be included. Always check the current claim-specific guidance before filing.

Does CT600P replace the additional information form?

No. HMRC guidance for creative industry claims refers to additional information as evidence for the claim. Treat CT600P and the additional information as linked parts of the same filing package.

Why might the payable credit differ from the headline credit?

The credit may be used against Corporation Tax or other liabilities, or affected by surrender and set-off rules, before a payable amount is due. The review should reconcile each step.

Useful HMRC references

This guide is general product and filing workflow information, not tax advice. Creative industry claims are specialist; check current HMRC guidance and obtain professional review where needed.

CT600P payable credit review for creative industry claims.