The timing rule clients often miss

GOV.UK's L2P guidance says a close company cannot claim relief until 9 months and 1 day after the end of the Corporation Tax accounting period in which the loan was repaid, written off, or released. It also says the company will not be repaid before this point.

That distinction is commercially important. A director may repay the loan today, but the company may still need to wait before the section 455 relief produces a cash repayment from HMRC. A practice should make that timing visible before the client approves the return or expects funds.

Separate the original charge from the later relief

CT600A work has two related but different questions. First, was there a close company loan or arrangement that created a section 455 charge for the accounting period? Second, has there been a repayment, release, or write-off that allows relief, and if so, when and how should the claim be made?

Keep the original loan period, the repayment period, and the claim route separate in the file. Blurring those dates is how repayment claims end up filed too early, filed through the wrong route, or explained badly to the client.

When CT600A may be enough

HMRC's CT600A guidance gives examples where relief can be claimed through CT600A when the repayment is made after the end of the accounting period but before the section 455 due date, or where relief is due by the time the return is sent. The return workflow still needs evidence of the repayment and the date relief becomes due.

For practice quality control, the reviewer should be able to see why CT600A was used rather than a later standalone L2P claim. That note is especially helpful when the loan repayment happened after the period end.

When L2P becomes the workflow

HMRC's L2P guidance is aimed at reclaiming tax paid by close companies on loans to participators. It covers companies and agents, and it explains the timing rule for claims after repayment, release, or write-off.

Use a post-filing control when relief is not yet due. The file should say the earliest claim date, who will revisit it, what evidence is needed, and what the client has been told. Otherwise, the repayment claim becomes an easy follow-up to miss.

Evidence to keep for a section 455 relief claim

Loan account reconciliation and the participator or connected-person details.
Original accounting period in which the loan or advance was made.
Amount charged under section 455 and Corporation Tax payment evidence.
Repayment, release, or write-off date and supporting transaction evidence.
Accounting period in which repayment, release, or write-off happened.
Earliest relief claim date based on the 9 months and 1 day rule.
Claim route: CT600A, amended return, or L2P.
Client approval and expectation note for HMRC repayment timing.

Client communication matters

Section 455 tax is easy to misunderstand because it feels like a temporary tax that should unwind as soon as cash comes back. The client update should separate repayment of the loan, relief becoming due, HMRC processing, and any interest or overpayment expectations.

Avoid putting private payment references, account details, client names, or internal identifiers into public content or reusable templates. Keep those details inside the client file and the secure filing workflow.

How Robocount helps practices manage CT600A follow-up

Robocount treats CT600A as part of the wider Corporation Tax workflow, not a detached form. That helps practices review the original loan charge, track relief evidence, and keep client approval tied to the final return package.

CT600A support for close company loan and participator workflows.
Review prompts for repayment, release, write-off, and relief timing.
Connection between supplementary pages, main CT600 tax result, and payment follow-up.
Evidence trail suitable for practice review, API workflows, and AI-assisted preparation.

FAQ

Can section 455 tax be reclaimed immediately after a loan is repaid?

Not necessarily. GOV.UK says relief cannot be claimed until 9 months and 1 day after the end of the Corporation Tax accounting period in which the loan was repaid, written off, or released.

Is CT600A always the right way to claim relief?

No. CT600A can be right in some timing scenarios, but HMRC also provides the L2P route for reclaiming tax paid by close companies on loans to participators. The accounting periods and claim timing decide the workflow.

What should a practice tell the client?

Explain the loan repayment date, when relief becomes due, whether CT600A or L2P is being used, what HMRC evidence will be kept, and that HMRC repayment timing may not match the date the director repaid the company.

Useful official references

This guide is general product and filing workflow information, not tax advice. Check current HMRC guidance and the company's facts before filing or claiming relief.

CT600A section 455 repayment claim timing.