Associated Companies and UK Corporation Tax: What Arab Directors with Multiple UK Companies Need to Know

UK Corporation Tax rates are tiered: 19% on profits up to £50,000, 25% on profits above £250,000, with a 26.5% marginal rate on the band between them. But these thresholds are divided equally between associated companies. If you own two associated UK companies, each company's thresholds are halved: the small profits rate applies below £25,000 per company, and the full 25% rate applies above £125,000. Three associated companies: thresholds divided by three. This can significantly accelerate when the higher rate bites.

When are two companies associated? The core test is control: Company A and Company B are associated if one controls the other, or if both are controlled by the same person or persons. Control means owning more than 50% of the share capital or having a majority of voting rights. As an Arab director who owns 100% of both a UK holding company and a UK trading company, those two companies are associated, you control both. This is the most common structure among multi-entity Arab directors.

A common example: UK Holding Co (100% owned by you) owns 100% of UK Trading Co. Both are associated, so the £50,000 and £250,000 limits are halved to £25,000 and £125,000 for each. Take a trading company with £60,000 of profit and no distributions, for a full 12 month accounting period. On its own, tax is £12,150, an effective rate of 20.25%. With one associated company, tax is £14,025, an effective 23.38%. The difference is £1,875. The figures come from the same tested calculation the site's Corporation Tax calculator uses, so the worked example and the tool cannot disagree. Change the profit, the period length or the distributions and the answer moves, so run your own numbers rather than scaling this one.

Dormant companies count as associated if they were associated at any time during the accounting period, unless they were dormant throughout the entire period. A company you keep dormant 'in case you need it' but don't trade through still halves your thresholds if you control it. This surprises many directors who assume dormant means irrelevant for tax.

Two unrelated individuals each owning separate companies are generally not associated with each other (neither controls the other's company). The rules changed in April 2023, replacing the old 'connected companies' test with the current 'associated companies' test under the Finance Act 2023. The current rules are slightly narrower than the old ones, some passive holdings that were previously associated no longer are. If your structure was reviewed under the old rules, it's worth checking again.

For most Arab directors with two companies earning under £50,000 each, the practical impact is modest. The issue bites hardest when your trading company earns £80,000–£200,000, the band where the marginal rate applies in a two-company group. Before restructuring, model the actual Corporation Tax difference against the compliance costs of the current structure. For some directors, the simplest answer is to merge the holding company back into the trading company and dissolve it once its purpose (asset protection or future sale planning) is no longer needed.