When your business is part of a wider ownership or control group, the tax rules treat you differently. In particular, the rules on associated companies are critical: they affect how the lower/larger profit thresholds for Corporation Tax are shared, how the small profits rate and marginal relief apply, and ultimately how much tax you pay.
At Naail & Co, we specialise in helping businesses understand their group / control structure and make sure tax planning is robust, compliant and forward-looking.
Get in touch with Naail & Co to book a free initial consultation.
What does “associated companies” mean?
A company is an associated company of another if one company controls the other, or both are under the control of the same person or persons.
Importantly, “control” has the same meaning as for close companies in the tax legislation.
The definition applies regardless of where the company is tax-resident (i.e., overseas companies can still be “associated companies” for UK tax purposes).
Why it matters
The concept of associated companies matters because it affects the thresholds that determine which Corporation Tax rate you pay – especially the lower rate for smaller profits, the main rate for large profits, and the “marginal relief” zone in between. Faulty counting of associated companies can therefore lead to paying a higher rate of tax than you might otherwise expect.
Key rule-points
Ask Naail & Co to review your structure and count of associated companies to make sure you’re properly positioned.
The current rate framework
From 1 April 2023, the UK Corporation Tax rates are:
How associated companies change the thresholds
If your company has one or more associated companies, the lower and upper profit thresholds are divided by the total number of associated companies (including your company). For example:
This means that the “small profits” 19% rate becomes unavailable at a much lower profit level and you can reach the higher rate much sooner.
Contact Naail & Co to model how your rate will change in light of any associated companies you may have.
To determine how many associated companies apply:
Let Naail & Co carry out an “associated company count review” before your CT return is submitted.
In this context, “control” means a company is controlled by another or both are under common control of the same person(s).
Control is defined in the legislation (for example via ordinary share capital, voting rights, rights to assets on winding-up) in the same way as for the “close company” rules.
Book a structure audit with Naail & Co to ensure your group and control picture is properly captured for tax.
When your accounting period is shorter than 12 months or straddles 1 April 2023 (when the rate change took place), you need to apply apportionment. For example, HM Revenue & Customs notes that for a company with an accounting period from 1 January 2023 to 31 December 2023 the period is split into 90 days (before 1 April) and 275 days (after).
Thresholds in the second part are prorated and then divided by the number of associated companies.
If a company has profits of £175,000 for a 12-month period of 1 Jan–31 Dec 2023 and has 3 associated companies throughout the period:
Without correct apportionment and associated company adjustment, you risk under-estimating your tax rate or falling into the wrong relief zone.
Request Naail & Co to model your situation (especially if you have a short or straddling accounting period) and produce the correct threshold calculation.
If profits fall between the adjusted lower and upper limits, your company pays 25% less a marginal relief allowance.
The standard formula (for FY 2023/24) uses a fraction of 3/200.
Importantly, once augmented profits exceed the upper limit (after adjustment), all profits are taxed at the main rate of 25%.
Because the lower/upper limits are reduced by division through the number of associated companies, you may reach the main rate much sooner and for relatively lower profits.
For example: if your company has 3 associated companies in total, your lower limit may become only around ~£12,500 and upper around ~£62,500 (before any apportionment).
Many business-owners are surprised to find they lose access to the 19% rate at a relatively modest profit level, simply because of the group structure and the associated company count.
Let Naail & Co run the marginal relief calculation for you – accurate modelling prevents unexpected tax rate jumps.
Contact Naail & Co for a full compliance check and review ahead of your filing deadlines.
Large and very large companies may be required to pay Corporation Tax by quarterly instalments rather than in one lump sum. The thresholds for this test are also influenced by group size and the number of associated companies.
The lower and upper limits for QIP obligation are also divided by the number of associated companies, meaning a company may unexpectedly be caught into instalment payments due to associated structure.
If your business is near the thresholds or your group is growing (or acquiring), you should-before the period ends-forecast whether you will become liable to QIPs, and prepare your cash flow accordingly.
Let Naail & Co assist you with cash flow modelling and instalment planning in the context of associated company status.
Be careful when overseas companies are controlled or controlling UK entities—they still may count as associated for UK CT purposes.
Any restructuring for tax advantage must comply with anti-avoidance rules, must be commercially justifiable, and properly documented. HMRC’s scrutiny of associated-company rules is increasing.
Book a strategic planning session with Naail & Co to review your group structure, international links and associated-company exposure.
If any of the above are unresolved, schedule your free initial consultation with Naail & Co now.
Understanding how associated companies influence your Corporation Tax position is no longer optional—it’s essential. When group structures evolve, control changes, or profits increase, the associated-company rules can trigger significant shifts in tax rate, timing of payments and compliance risk.
At Naail & Co, we offer tailored advice to clarify your status, optimise your tax position and ensure full compliance with HMRC’s rules.
Get in touch with Naail & Co to book a free initial consultation.
Associated companies are businesses that are under the control of the same person or persons, or where one company controls another. HMRC counts both UK and overseas companies in this definition. The number of associated companies you have affects how your Corporation Tax thresholds are divided and determines whether you qualify for the small profits rate or pay the main 25% rate.
From 1 April 2023, Corporation Tax rates depend on profit thresholds. If you have associated companies, those thresholds are divided by the number of companies, which means you may reach the higher 25% rate sooner. Fewer associated companies usually means higher thresholds and potentially more access to the 19% small profits rate.
To calculate the number of associated companies, include every company under common control for any part of your accounting period — even those based outside the UK. Dormant or inactive companies may be disregarded only if they carried on no trade or business throughout the period. Getting this count right is essential for accurate Corporation Tax calculations.
Yes. Associated companies rules apply globally — control of a UK company by, or over, an overseas company can still make them associated for Corporation Tax purposes. This means international groups and cross-border structures should review ownership and control carefully to avoid unexpected tax rate changes.
If your Corporation Tax return lists the wrong number of associated companies, you could overclaim marginal relief or apply an incorrect rate. HMRC actively reviews this area and may open compliance checks if inconsistencies are found. Professional advice helps ensure your count and documentation are accurate before filing.
Before April 2023, Corporation Tax used the concept of 51% related group companies for rate purposes. The current associated companies test is wider — it includes entities under common control, not just those with shareholdings above 50%. This broader scope means family-owned or connected businesses can be linked even without formal group ownership.
If your company has associated companies, the lower and upper profit limits used to calculate marginal relief are divided among them. This means you enter the marginal relief band at lower profit levels, reducing the benefit sooner. Accurate modelling ensures you don’t rely on marginal relief when your adjusted limits no longer support it.
Dormant or inactive entities are sometimes disregarded for associated companies purposes — but only if they have not carried on any trade or business during the accounting period. Passive holding companies that simply own shares or property may still count as associated, so careful review is essential.
Large and very large companies must pay Corporation Tax by instalments. The thresholds for this are divided by the number of associated companies, meaning businesses with multiple related entities may fall into the QIP regime earlier than expected. Monitoring group growth is key to avoiding unexpected cash-flow shocks.
Naail & Co Chartered Certified Accountants and Tax Advisors can help identify your associated companies, assess control relationships, model your Corporation Tax exposure and apply the correct small profits or marginal relief rate. Our team ensures compliance, reduces risks, and provides proactive tax-efficient structuring advice.
Get in touch with Naail & Co today to book a free initial consultation.
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