Who this is for: Directors who have an overdrawn director's loan account or who regularly borrow from their company to manage personal cash flow.
In a cash-flow crunch, you borrowed £50,000 from your company. You intended to repay it soon. The business was profitable, the loan felt temporary, and your accountant knew about it. Nine months after the company's year-end, the loan was still outstanding.
The company paid 33.75% corporation tax on the £50,000 loan balance under Section 455. That is £16,875 in additional corporation tax, paid because the loan was not repaid within the nine-month window.
How Section 455 works
Section 455 of the Corporation Tax Act 2010 applies when a close company makes a loan to a participator, typically a director-shareholder. If the loan is not repaid within nine months of the company's accounting year-end, the company pays a corporation tax charge equal to 33.75% of the outstanding balance.
The charge is not permanent. When the loan is repaid, the company can reclaim the Section 455 tax from HMRC. But the reclaim is not immediate: it is processed in the accounting period after repayment, and HMRC retains the interest on the tax paid in the interim. On a £50,000 loan outstanding for 18 months, the interest cost to HMRC is approximately £1,500 to £2,000.
If the loan exceeds £10,000, it also counts as a benefit in kind. The director pays income tax on the notional interest at the official rate (currently 2.25%), and the company pays Class 1A National Insurance on the benefit value.
| Loan amount | Section 455 charge | Benefit in kind (if over £10k) | Total cost if outstanding 18 months |
|---|---|---|---|
| £50,000 | £16,875 | ~£225 income tax + NIC | ~£18,000 (inc. interest to HMRC) |
| £100,000 | £33,750 | ~£450 income tax + NIC | ~£36,000 (inc. interest to HMRC) |
The holding company alternative
A holding company that has been accumulating profits over previous years has the capital to make a formal intercompany loan to the trading subsidiary, which can then make a legitimate payment to you as salary or dividend. Alternatively, the holdco can make a formal loan to you personally with documented commercial terms, no Section 455, no benefit in kind, and interest that is deductible in the holdco against its investment income.
The holding company does not eliminate the need for personal cash management. It provides a capital reservoir that makes the need for informal director's loans largely unnecessary.
You repaid the loan. The company reclaimed the Section 455 tax. But HMRC kept the interest. The cost of not having a holding company with sufficient capital to avoid the personal borrowing: approximately £18,000 on a £50,000 loan. The holdco would have cost less than £5,000 to install.
Map Your Structure
If you have an overdrawn director's loan account, the audit will show you the Section 455 exposure and the holding structure that makes personal borrowing from the company largely unnecessary.
Run the Free Audit →What This Means for Your Position
The situations in this article are not edge cases. They are the default outcome for founders who operate without the architecture above their business. The audit maps your position in five minutes and tells you exactly which of these gaps apply to you.
The audit is free. The Discovery Call is a paid 30-minute working session. The £500 is credited in full against the Capital Architecture.
The Extraction Architecture
A director's loan is a Stability-layer workaround. The S455 charge is what happens when the workaround is not managed correctly. The Growth layer (a holding company above the trading company) means capital can be retained and accessed at the holding company level without triggering the S455 rules.
The Expansion layer is the constitutional architecture that makes extraction a planned, governed process rather than a reactive one, defined mechanisms for how capital moves from the group to the founder, when, and at what tax cost. The S455 charge is a symptom of an architecture that was never designed for the founder's actual capital needs.