Pillar Guide · Updated July 2026
Close Company Rules: A Complete UK Tax Guide for 2026/27
Most small owner-managed limited companies in the UK are "close companies" for tax purposes, which brings a specific set of anti-avoidance rules into play, most notably around loans to directors and shareholders. This guide explains what makes a company close, why it matters, and the key rules that follow from close company status.
What Makes a Company "Close"
A company is broadly a close company if it is controlled by five or fewer participators (typically shareholders), or by any number of participators who are also directors, taking into account shares held by associates such as close family members. In practice, this definition catches the vast majority of small and family-owned UK limited companies, since most start-ups and owner-managed businesses have a small number of director-shareholders.
Why Close Company Status Matters
Close company status brings a specific set of anti-avoidance provisions into play, designed to stop shareholders extracting value from their company in ways that avoid Income Tax, particularly through loans and informal benefits rather than salary or dividends. The most significant of these in practice is the tax charge that applies when a close company lends money to a shareholder or director, commonly known by its legislative reference, s455.
Who Counts as a Participator
A participator is broadly anyone with a financial interest in the company, most commonly a shareholder, but the definition can also extend to loan creditors and certain other people with rights over the company's income or assets. For the purposes of the close company rules, the actions of a participator's associates — including a spouse or civil partner, children, parents, and business partners — are also taken into account when assessing control.
Loans to Participators and the s455 Charge
If a close company lends money to a participator (such as a director drawing more than their salary and dividends through their director's loan account) and the loan remains outstanding nine months after the end of the accounting period, the company must pay a tax charge, currently set at 33.75% of the outstanding balance, to HMRC. This charge is repayable to the company once the loan is repaid, but only after a delay, and it applies in addition to any benefit-in-kind tax charge on the participator if the loan is interest-free or below the official rate.
Benefits Provided to Participators
Where a close company provides a benefit — rather than a loan — to a participator who is not an employee or director, such as free use of a company asset, the value of that benefit can be taxed on the participator as a distribution (similar to a dividend) rather than under the normal benefit-in-kind rules that apply to employees. This closes a gap that might otherwise let non-employee shareholders receive value from the company without any Income Tax charge.
Exceptions to Close Company Status
Certain companies are excluded from being treated as close companies even if they would otherwise meet the definition, including companies genuinely controlled by the public through a listing on a recognised stock exchange with sufficient shares held by the public, and certain non-UK resident companies. In practice these exceptions rarely apply to small private companies, which almost always fall within the close company rules.
Writing Off a Director's Loan
If a close company formally writes off or releases a loan owed by a director or shareholder rather than the loan being repaid, the amount written off is generally treated as a taxable distribution in the hands of that individual, taxed as dividend income rather than earnings, and the company can then reclaim any s455 tax it had paid on that loan. This is different from simply not enforcing repayment, which would not by itself trigger this treatment.
Practical Steps for Owner-Managers
Owner-managers can avoid or reduce s455 exposure by repaying director's loan account overdrawn balances within nine months of the company's year end, formally declaring a dividend or bonus to clear the balance instead of an informal drawing, or keeping clear, contemporaneous records of all money drawn from and repaid to the company throughout the year to avoid HMRC challenging repayments as artificial 'bed and breakfasting' of the same loan.