The filing problem

Directors' loan accounts are common in owner-managed companies. The CT600 risk is that the loan account is often reviewed late, after the accounts are drafted and close to the Corporation Tax filing deadline. By then the adviser needs more than a year-end balance: they need dates, repayments, releases, write-offs, connected-person detail, and a clear answer on whether CT600A and section 455 tax are in point.

HMRC's directors' loan guidance says CT600A is used with the Company Tax Return to show relevant amounts owed at the end of the accounting period. It also explains that a company can reclaim Corporation Tax paid on a director's loan once the loan is repaid, written off, or released, subject to the timing rules.

The key dates to capture

The first date is the accounting period end. That establishes what was outstanding at the year end and whether CT600A needs to explain a close company loan position. The second date is 9 months and 1 day after the end of the accounting period. That is the point commonly used in HMRC guidance for deciding whether section 455 tax is payable or whether relief is not yet available.

The third date is the actual repayment, release, or write-off date. That date drives whether a claim can be made on CT600A for the same return, through an amended return, or separately using form L2P. For a practice, missing one of these dates usually means the file cannot be reviewed properly.

Scenario 1: loan repaid before the section 455 due date

If a close company loan is repaid within 9 months of the accounting period end, HMRC guidance indicates the company may not need to pay the section 455 tax because relief is available before the tax falls due. The return still needs a careful CT600A review because the loan may have existed during the period and the repayment needs to be evidenced.

The review file should show the opening balance, advances, repayments, year-end balance, repayment date, and the reason the preparer concluded that no section 455 tax remains payable. Do not rely on a single balance sheet figure where there were multiple drawings and repayments.

Scenario 2: loan still outstanding after 9 months and 1 day

If the relevant amount remains outstanding after the 9-month point, section 455 tax may be due from the company. That tax is separate from Corporation Tax on trading profits. It can create a cash-flow surprise for directors because the company may have a normal Corporation Tax liability and an additional loan-to-participator charge.

In software terms, this is not just a checkbox. The CT600A workflow should calculate or present the loan charge, bring it back into the main CT600 where required, and make the payment position visible before submission.

Scenario 3: loan repaid after the return is filed

A company can reclaim tax paid on a close company loan once the loan is repaid, released, or written off, but HMRC's L2P guidance says the company cannot claim relief until 9 months and 1 day after the end of the accounting period in which the repayment, release, or write-off happened. The repayment does not automatically produce an immediate cash repayment from HMRC.

If the repayment happens within 2 years of the end of the accounting period when the loan was taken out, HMRC says CT600A can be used when preparing or amending that Company Tax Return. If the claim relates to a different accounting period, or the return is amended in writing, HMRC points to form L2P instead.

Watch for bed and breakfasting

A repayment followed by a similar new loan may not give the result the director expects. HMRC guidance includes anti-avoidance rules for cases where loans are repaid and similar amounts are borrowed again. The practical message is simple: review the sequence of movements, not only the closing balance.

A good review flow asks for the dates and amounts around the repayment window, highlights large round-sum repayments, and leaves an audit trail when the preparer decides whether relief is available.

Practice checklist before filing

Confirm whether the company is a close company.
Identify the participator, director, shareholder, or connected person.
Reconcile loan account movements from the ledger to the accounts.
Separate salary, dividends, expense reimbursements, and true loan movements.
Record year-end balances and post-year-end repayments.
Check whether anything remained outstanding 9 months and 1 day after the period end.
Document whether CT600A, section 455 tax, relief under section 458, or L2P is needed.
Keep the client approval note with the return package.

How Robocount helps

Robocount treats CT600A as part of the Corporation Tax return package rather than an afterthought. The workflow is designed to keep directors' loan facts visible next to the main CT600, computations, supplementary-page indicators, review notes, and filing readiness checks.

CT600A support for close company loan workflows.
Review prompts for repayments, releases, write-offs, and relief claims.
Connection back to the main CT600 tax position.
Practice-friendly evidence trail for owner-managed company files.
Structured workflow suitable for browser, API, and AI-assisted preparation.

FAQ

Does repaying a director's loan before the filing deadline remove CT600A?

Not automatically. The CT600A position depends on the close company facts, the loan movements, what was outstanding at the period end, and the repayment timing. The file should show why the preparer included or excluded CT600A entries.

Can section 455 tax be reclaimed?

HMRC says close companies can claim relief on tax paid when the loan is repaid, released, or written off. The timing and route of the claim matter, especially where the repayment happens in a later accounting period.

Is form L2P always required?

No. HMRC says CT600A can be used for certain claims within 2 years of the end of the accounting period when the loan was taken out. L2P is used in other cases, including where the claim relates to a different accounting period.

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.

Directors' loan repayment timing: how CT600A, section 455 tax, and relief claims fit together.