7 min read
UK businesses with Irish subsidiaries often proceed on the understanding that the controlled foreign company rules do not apply to them. Ireland operates a recognised corporate tax regime and maintains a double taxation treaty with the UK. A well-founded Irish entity with real operational substance is in a strong position under that framework. What matters is understanding precisely how the exemption works, because the legislation does not operate on the basis of treaty status alone.
The UK CFC rules allow HMRC to attribute the profits of a foreign subsidiary to the UK parent and charge those profits at the UK corporation tax rate, currently 25 percent. The Irish trading rate is 12.5 percent. Because the Irish rate falls below 75 percent of the UK rate, an Irish subsidiary sits within scope as a starting point. The question is then whether an exemption applies, and the answer depends on the substance of what the Irish entity actually does.
The exemptions most businesses rely upon are the Excluded Territories Exemption or the Low Profits Exemption, which apply where the profits of the Irish entity arise from activities carried out by that entity using its own people, its own assets, and its own decision-making capacity. HMRC examines what the legislation refers to as significant people functions, meaning the individuals who perform the activities that generate value within the business. Where those individuals are employed by and located within the Irish entity, the exemption can be supported with appropriate evidence. Where those activities are carried out in the UK, the associated profits may be attributed to the UK parent regardless of the legal structure in place.
The evidence standard is demanding and applied carefully. HMRC looks at where contracts are negotiated, where key decisions are made, where the people with real authority are based, and whether the Irish entity could continue to function independently if the UK parent withdrew its support. That evidence needs to have been created at the time the activities occurred, and regulators are well equipped to assess its quality.
A business whose Irish entity had solid substance at the outset and has not reviewed that position since is in a more vulnerable position than it may realise. Substance erodes over time. People leave. Functions migrate. Governance becomes informal. The exemption that was well-founded in year one may no longer be supportable in year four. The CFC charge, if it arises, is an additional charge on top of the Irish tax already paid. The accumulated cost of several years of unaddressed exposure is substantially larger than most businesses expect when they first work through the numbers.
If the Irish subsidiary has never had a formal CFC analysis conducted, that analysis is overdue. The question is whether there is documented evidence, in a form that would survive scrutiny in an HMRC enquiry, that the exemption actually applies. Conducting that analysis and building the documentation is a modest undertaking relative to what it protects against. The only meaningful variable is whether it happens before a question is raised or after.