What is a close company? UK tax implications explained

If you run a small, limited company in the UK, there’s a good chance it’s classified as a close company. Most are.

It’s not something Companies House will tell you outright, but close company status has real implications for how your business is taxed, particularly when it comes to loans between the company and its shareholders or directors.

This guide explains what a close company is, how to work out whether your limited company qualifies, and what the tax consequences look like in practice.

What is a close company?

A close company is a UK-resident company that meets the statutory tests in Section 439 of the Corporation Tax Act 2010:

• It’s under the control of five or fewer participators
• It’s under the control of participators who are also directors, regardless of how many there are
• Five or fewer participators – or participators who are directors – would be entitled to more than half of the company’s assets if the company was wound up

The word “close” itself refers to how closely the company is held by a small group of people. It has nothing to do with whether the company is trading, dormant, or being wound down.

In practice, most are privately owned limited companies, but the definition is not limited to private companies, as an unlisted PLC can also be a close company.

Which companies cannot be close companies?

Certain types of companies are specifically excluded from the close company definition under Sections 442 to 447 of the Corporation Tax Act 2010. These include:

• Registered societies (formerly industrial and provident societies) and building societies
• Companies controlled by or on behalf of the Crown
• Companies controlled by one or more non-close companies
• Certain quoted companies where shares carrying at least 35% of the voting power are beneficially held by the public, subject to conditions
• Non-UK resident companies

Limited liability partnerships also fall outside the close company rules, as they are partnerships rather than companies. Certain quoted PLCs may also fall outside the close company rules where the relevant statutory conditions are met, but an unlisted PLC can still be a close company.

What is a participator?

“Participator” is a tax law concept defined under Section 454 of the Corporation Tax Act 2010.

A participator is any person who has a share or interest in the capital or income of the company. This includes anyone who:

• Possesses or is entitled to acquire share capital or voting rights in the company
• Has a right to receive or participate in distributions of the company
• Is a loan creditor of the company
• Is entitled to acquire any of the above rights

In most limited companies, the participators will simply be the shareholders. In a company limited by guarantee, members may be participators depending on their rights and interests.

It’s also worth noting that the interests of “associates” count when determining control. Under Section 448 of the Corporation Tax Act 2010, an associate includes relatives, such as spouses, civil partners, parents, children, and siblings, as well as business partners, and trustees of certain settlements.

In practice, this means a husband-and-wife shareholding is treated as a single grouping for the purposes of the five-participator test.

• Are shareholders and directors liable for company debts?
• Preparing annual accounts for your limited company

Is your limited company a close company?

Let’s look at some practical examples to help you work out whether your company qualifies as a close company.

Example 1: Sole shareholder-director

Mr. A is the sole shareholder and director of the company.

This is a close company. It is controlled by fewer than five participators.

Example 2: Six shareholder-directors

Mrs. A, Mrs. B, Mrs. C, Mrs. D, Mrs. E, and Mrs. F are all shareholders and directors.

This is a close company. Although there are six participators, they are all directors. The “participators who are also directors” test applies regardless of the number involved.

Example 3: Six shareholders, one director

Mr. A, Mr. B, Mr. C, Mr. D, Mr. E, and Mr. F are all shareholders. Only Mr. A is a director.

This would typically not be a close company. There are more than five participators, and they are not all directors.

Example 4: Three shareholders, two non-shareholding directors

Mrs. A, Mrs. B, and Mrs. C are shareholders. Mrs. D and Mrs. E are directors only (with no shares).

This is a close company. There are only three participators (the shareholders), which satisfies the five-or-fewer test. Directors without shares or other interests in the company’s capital or income are not participators.

Author’s tip: If you’re unsure about your company’s close company status, it’s worth speaking to an accountant. Getting it wrong can lead to unexpected tax charges, particularly around director loans and benefits.

Tax implications of close company status

Close company status matters because it triggers a specific set of tax rules around company distributions, loans, and benefits.

These rules are designed to prevent shareholders and directors from extracting company funds without paying the appropriate amount of tax. Here are the main areas to be aware of:

Loans to participators (Section 455 tax)

This is the most significant tax consequence of being a close company. Under Section 455 of the Corporation Tax Act 2010, a close company faces a temporary tax charge if it makes a loan or advance to a participator (or their associate).

The charge applies if that loan is still outstanding nine months and one day after the end of the company’s accounting period. At that point, the company must pay a Section 455 charge to HMRC.

There are two exceptions where Section 455 doesn’t apply:

• A debt incurred for the supply of goods or services in the ordinary course of the company’s trade, provided the credit does not exceed six months or the company’s normal credit terms
• Loans of £15,000 or less to full-time working directors or employees who do not have a material interest in the close company

The Section 455 rate is 33.75% for loans made before 6 April 2026 and 35.75% for loans made on or after 6 April 2026.

Remember that the charge is designed to be temporary. Once the loan is repaid, written off, or released, the company can reclaim the tax from HMRC. However, if the loan is never cleared, the charge stands.

And as the example below shows, even when the loan is repaid, the gap between paying and reclaiming can be longer than you’d expect.

How the Section 455 charge works in practice

Section 455 tax is temporary – it’s not a permanent cost. But the timing matters, so let’s walk through a typical example.

You’re the sole director and shareholder of a close company with a 31 March 2026 year end. During the year, you borrow £20,000 from the company to cover personal costs.

Your deadline to repay the loan is nine months and one day after the year end – 1 January 2027. If you repay it by then, no Section 455 charge applies. But let’s say you don’t. The loan is still outstanding on 1 January 2027, so your company must pay a Section 455 charge of £6,750 – 33.75% of £20,000.

In June 2027, you repay the full £20,000. Your company can then claim relief for the Section 455 tax already paid. But HMRC won’t repay that tax until nine months and one day after the end of the accounting period in which the repayment is made.

So, if the repayment is made in the accounting period ending 31 March 2028, the earliest repayment date would normally be 1 January 2029. That means your company is without £6,750 for roughly a year, even though the loan is eventually repaid. Repaying the loan on time would’ve avoided the charge altogether.

Benefits and distributions to participators

Under Section 1064 of the Corporation Tax Act 2010, if a close company incurs expenses in providing benefits to a participator, those expenses may be treated as distributions rather than deductible trading expenses.

This applies to living accommodation, entertainment, domestic services, and other benefits or facilities of any kind.

Where a benefit is treated as a distribution, the company cannot deduct the cost against its taxable profits, and the participator may face an income tax charge on the cash equivalent of the benefit received.

For example, suppose your spouse holds shares in the company but doesn’t work for it. If the company pays £3,000 towards their private medical insurance, HMRC may treat that as a distribution. The company can’t deduct the cost, and your spouse may owe income tax on the benefit.

If you’re unsure whether a particular expense could be caught by these rules, it’s worth checking with your accountant.

Benefit-in-kind on interest-free loans

If a close company lends money to a director or employee who is also a participator without charging interest, or at a rate below HMRC’s official rate, a separate benefit-in-kind charge may apply.

This is because HMRC treats the difference between what the borrower pays and what they would pay at the official rate as a taxable benefit.

The official rate is currently 3.75% as of 6 April 2026. The taxable benefit is calculated on the average outstanding loan balance, and the company also pays Class 1A National Insurance on top.

To avoid this charge, the company can charge interest at or above the official rate — provided the director actually pays it during the tax year.

Close investment-holding companies

A close company that exists wholly or mainly to hold investments, rather than to carry on a trade or certain other qualifying activities, may be treated as a close investment-holding company under Section 34 of the Corporation Tax Act 2010.

This matters because a close investment-holding company may be excluded from the small profits rate and marginal relief for Corporation Tax, unless an exception applies. It can also affect access to certain reliefs and tax treatment more generally.

How to stay compliant as a close company

If your limited company is a close company, here are some practical steps to manage the associated tax obligations:

• Monitor director loan accounts regularly – keep a clear, up-to-date record of all transactions between the company and its participators. Review balances well before the nine-month deadline.
• Repay loans before the deadline – the simplest way to avoid a Section 455 charge is to ensure any overdrawn director’s loan account is cleared within nine months and one day of the company’s year-end.
• Declare dividends carefully – crediting a dividend to a participator’s loan account is one way to clear the balance, but this creates a personal income tax liability and uses up distributable reserves. Plan ahead with your accountant.
• Be aware of anti-avoidance rules – HMRC’s “bed and breakfasting” rules prevent participators from repaying a loan and re-borrowing within 30 days to avoid the Section 455 charge. Arrangements designed to circumvent the charge can also be caught by the Targeted Anti-Avoidance Rule (TAAR), which was strengthened from 30 October 2024.
• File the CT600A where needed – if the participator loan rules trigger reporting, the company may need to complete the CT600A supplementary pages as part of its Corporation Tax return.

Start your company with confidence

Most UK private companies are close companies, and being one is not a problem in itself.

What matters is understanding the additional tax rules that come with the classification so you can manage director loans, dividends, and benefits tax-efficiently. Reviewing your company control structure early on helps you plan ahead.

If you’re setting up a new limited company, Quality Company Formations can help you get started on the right footing, or explore our Fully Inclusive Company Formation Package for built-in compliance support from day one.