Writing off a director's loan sounds like a tidy way to clear a debt. You owe the company money, the company forgives it, and everyone moves on. But HMRC does not see it that way. The director loan write off tax implications can hit both the company and the director with unexpected tax bills, often in the same financial year.

This article covers what happens when a limited company writes off a director's overdrawn loan account. We will walk through the S455 tax charge, the benefit in kind on the director, the corporation tax treatment, and the reporting requirements. Real numbers throughout.

What Is a Director's Loan Account?

A director's loan account (DLA) tracks money flowing between you and your company. If you take more out than you put in, the account goes overdrawn. That overdrawn balance is a debt the director owes the company.

Common reasons for an overdrawn DLA include:

  • Drawing money before declaring a dividend
  • Paying personal bills from the company account
  • Using company funds for a personal purchase (a car deposit, a holiday, home improvements)
  • Lending yourself money that you later cannot repay

If the balance stays overdrawn past the company's year end, you must report it on the accounts. If it exceeds £10,000 at any point in the year, it triggers a benefit in kind charge on the director for the notional interest benefit.

But the real problem comes when the company decides to write the loan off entirely.

What Happens When a Company Writes Off a Director's Loan?

Writing off a director's loan means the company forgives the debt. Legally, the director no longer owes the money. The company removes the debtor from its balance sheet.

For tax purposes, this triggers two separate charges:

  • On the company: A section 455 (S455) tax charge at 33.75% of the loan amount written off. This is a tax the company pays to HMRC. It is not reclaimable.
  • On the director: A benefit in kind equal to the loan amount written off. The director pays income tax and National Insurance on that amount as if it were salary.

Both charges apply in the same accounting period. There is no overlap relief. The company pays S455 tax. The director pays income tax. Both bills land at once.

Example: Writing Off a £20,000 Director's Loan

Let us say you are the sole director of a Manchester-based consultancy. Your DLA is overdrawn by £20,000 at year end. The company writes it off on 31 March 2026.

Company tax bill:

  • S455 tax: 33.75% of £20,000 = £6,750
  • This is due 9 months and 1 day after the year end (31 December 2026 for a 31 March year end)
  • It is not refundable. The company has paid tax on the loan write off.

Director tax bill:

  • Benefit in kind: £20,000 treated as earnings
  • Income tax at 40% (assuming higher rate): £8,000
  • Class 1 NIC (employer 13.8% and employee 2% on the BIK amount): roughly £3,160 combined
  • The director reports this on their self assessment (SA100) for 2025/26
  • The company reports it on a P11D and pays employer NIC on the BIK

Total tax triggered: roughly £17,910 on a £20,000 loan write off. That is an effective tax rate of nearly 90%. The director gets no cash. The company gets no deduction.

Does the Company Get a Corporation Tax Deduction for the Write Off?

No. Writing off a director's loan is not an allowable expense for corporation tax purposes. The company cannot deduct the loan amount from its taxable profits.

Why? Because the loan was not incurred wholly and exclusively for the purposes of the trade. It was a personal advance to the director. HMRC treats the write off as a distribution of profits, not a trading expense.

The company's corporation tax computation adds back the loan write off as a disallowable item. So if your company made £100,000 profit and wrote off a £20,000 loan, you still pay corporation tax on the full £100,000. No relief.

What About Capital Gains Tax?

There is a secondary tax issue that many directors miss. When a company writes off a director's loan, HMRC may treat the write off as a distribution for capital gains purposes. That means the director could face a capital gain on the amount written off, calculated as if the company had sold a capital asset to settle the debt.

In practice, this applies mainly where the loan was used to acquire an asset that has since increased in value. For example, if you borrowed £50,000 from your company to buy shares in a third company, and those shares are now worth £80,000, writing off the loan could trigger a CGT charge on the £30,000 gain.

This is a complex area. If your loan was used to acquire assets, speak to your accountant before writing anything off. The interaction between S455, BIK, and CGT can produce unexpected results.

What If the Loan Was Written Off in a Previous Year?

If the company wrote off the loan in an earlier accounting period and did not report it, you have a disclosure problem. HMRC can go back up to 6 years (20 years in cases of deliberate non-disclosure) and assess the tax due, plus interest and penalties.

If you discover an unwritten write off, make a disclosure to HMRC as soon as possible. Use the Digital Disclosure Service or write to your HMRC office. The penalties are lower for unprompted disclosure.

Do not assume that because the loan was written off informally (a handshake agreement, a note in the accounts) it does not count. HMRC looks at the substance. If the company no longer expects repayment, the write off has happened for tax purposes.

How Do You Report a Director's Loan Write Off?

Reporting is split between the company and the director.

Company reporting:

  • Include the loan write off in the company accounts as a separate line item (often "Loan write off" under administrative expenses, then disallowed in the tax computation)
  • Complete a P11D for the director showing the benefit in kind amount
  • Pay Class 1A NIC on the BIK (13.8% of the loan amount) via the P11D(b) return
  • Include the S455 tax charge on the corporation tax return (CT600) in the supplementary pages
  • The S455 tax is payable alongside the corporation tax, 9 months and 1 day after year end

Director reporting:

  • Report the benefit in kind on your self assessment return (SA100)
  • Include the amount in the "Benefits from employment" section
  • Pay income tax on the BIK at your marginal rate
  • If the loan was used to acquire assets, consider whether a CGT return is needed

If the loan was written off in the current year, the P11D must be filed by 6 July following the tax year. The director's self assessment deadline is 31 January following the tax year.

Can You Avoid the Tax Charges?

There are limited options to reduce the tax impact, but none that eliminate it entirely.

Repay the loan instead of writing it off. If the director can repay the loan from personal funds, the DLA clears without triggering S455 or BIK. The director then draws the money back as a dividend or salary in a later year, which is taxed at normal rates. This is often cheaper than the 90% effective rate on a write off.

Convert the loan to a dividend. If the company has sufficient distributable reserves, it can declare a dividend equal to the loan amount. The director pays dividend tax on that amount (8.75%, 33.75%, or 39.35% depending on their tax band). The company avoids S455. The director avoids the BIK. But the dividend must be properly documented and supported by distributable profits. You cannot backdate a dividend to cover an existing loan. The dividend must be declared before the loan is written off, or the company must have the reserves to support it at the time of the write off.

Negotiate a repayment plan. If the director cannot repay in one lump sum, agree a formal repayment schedule with the company. Interest must be charged at HMRC's official rate (currently 2.25% for 2025/26) to avoid a benefit in kind. The loan stays on the balance sheet and reduces over time.

Use a director's loan agreement. If the loan was always intended to be repaid, document it properly. A signed loan agreement with a repayment schedule and interest at the official rate avoids the BIK and S455 issues. But it must be a genuine loan, not a disguised dividend.

None of these options work if the director has no cash to repay and the company has no reserves to declare a dividend. In that case, the write off is the only option, and the tax charges are unavoidable.

What About Insolvency?

If the company is insolvent and the director cannot repay the loan, the write off is forced by circumstance. The tax charges still apply. HMRC will pursue the director for the BIK tax even if the company goes under. The S455 tax becomes a debt of the company, but if the company has no assets, HMRC may write it off. The director's personal tax liability remains.

If the director is personally insolvent, the loan write off may be part of an Individual Voluntary Arrangement (IVA) or bankruptcy. In those cases, the tax treatment is different. HMRC may accept a lower amount. Speak to an insolvency practitioner before writing off a loan in this context.

Key Takeaways

  • Writing off a director's loan triggers S455 tax on the company (33.75%) and a benefit in kind on the director (income tax at marginal rate plus NIC)
  • The company gets no corporation tax deduction for the write off
  • If the loan was used to acquire assets, CGT may also apply
  • Repaying the loan or converting it to a dividend (if reserves allow) are usually cheaper than a write off
  • Report the write off correctly on P11D, CT600, and self assessment to avoid penalties
  • If you discover an unwritten write off from a prior year, disclose it to HMRC promptly

If you are considering writing off a director's loan, run the numbers first. The director loan write off tax implications can turn a £20,000 debt into a £17,000 tax bill. In many cases, a different route works better. As ICAEW qualified accountants, we help directors and companies plan these decisions before they become problems.

For more on managing your company's finances, see our guides on director pay and dividends and corporation tax planning. If you need specific advice on your DLA, contact our team.