May 13
If you are planning to set up a company in both the UK and Ireland, the opportunity can be exciting. You may be opening access to 2 markets, serving customers on both sides of the border, building a stronger trading presence, or creating a structure that supports long-term growth.
However, cross-border business is not just a matter of registering 2 companies and issuing invoices. You need to think carefully about corporation tax, VAT, payroll, bookkeeping, company filing deadlines, management accounts, cash flow, and how money moves between each entity.
This is where working with experienced accountants armagh can make a real difference, especially if you need joined-up advice across Northern Ireland, the wider UK and Ireland.
Before you register anything, you need to be clear on why you need a company in both jurisdictions.
For example, you may need a UK company to serve UK customers, employ UK staff, hold UK contracts or trade from Northern Ireland. You may also need an Irish company to serve customers in Ireland, employ staff there, access local banking, or create a stronger commercial presence in the EU.
The wrong structure can create unnecessary admin and tax exposure. The right structure can make trading clearer, cleaner and easier to manage.
You should think about:
These points matter because tax authorities look beyond the company name. They will want to understand where the real activity, control and value sit.
Corporation tax is one of the first areas to review.
In the UK, companies with profits under £50,000 are generally subject to the 19% small profits rate, while companies with profits over £250,000 are generally subject to the 25% main rate. Marginal relief can apply between those limits.
In Ireland, Revenue states that Corporation Tax is charged at 12.5% on trading income and 25% on certain non-trading income, such as rental and investment income.
That difference can influence your planning, but tax rates should never be the only factor. You also need to consider where work is actually carried out, where customers are based, where directors make decisions, and whether either company is creating a taxable presence in the other country.
If you are unsure how profits should be reported across 2 jurisdictions, SCC Chartered Accountants’ Cross-border tax advisory support can help you review the full picture before small decisions become expensive mistakes.
Setting up the company is only the first step. You also need to register for the right taxes.
In the UK, a company must tell HMRC that it is active and within the charge to Corporation Tax within 3 months of starting its tax accounting period.
In Ireland, Revenue says a company must have a CRO number before registering for tax, and either the company or its tax agent must inform Revenue when the company starts.
This is where businesses can trip up. A company may be incorporated but dormant. Another may start trading earlier than expected. A director may assume the accountant has registered everything, while the accountant may still be waiting for confirmation that trading has begun.
Clear communication matters from day 1.
VAT is another major consideration, especially where your business sells goods or services across the UK–Ireland border.
In the UK, you must register for VAT if your total taxable turnover for the last 12 months goes over £90,000.
In Ireland, the main VAT registration thresholds include €42,500 for services only and €85,000 for goods, although the exact position can depend on what you supply.
The challenge is not only the threshold. It is also the VAT treatment of each transaction.
Goods moving between Northern Ireland and Ireland may be treated differently from goods moving between Great Britain and Ireland. Services can follow different place-of-supply rules again. That means your bookkeeping system needs to distinguish between goods, services, locations, customer types and VAT registration status.
SCC’s article on VAT compliance for businesses operating across the UK–Ireland border is a useful read if your trading flows involve Northern Ireland, Great Britain and Ireland.
When you run companies in 2 jurisdictions, weak bookkeeping can quickly turn into a bigger problem.
You may have 2 bank accounts, 2 currencies, 2 tax authorities, different VAT rules, different payroll systems and different reporting deadlines. If your bookkeeping is not structured properly, you can lose visibility over cash flow and profitability.
Cloud systems can help, but only if they are set up correctly. Your chart of accounts should be clear. Your VAT codes should be checked. Your reporting categories should make sense for both companies. You should also decide how intercompany transactions will be recorded and reconciled.
SCC’s Digital Bookkeeping service can support businesses that want cleaner records and better financial visibility. You may also find SCC’s article on switching to cloud accounting for SMEs useful if your current system is not built for growth.
Payroll becomes more complex when your staff are based in more than 1 country.
You need to consider where employees physically work, which tax system applies, what social security obligations arise, and whether the employment contract matches the reality of the role.
A UK employee working for an Irish company, or an Irish employee working for a UK company, can create unexpected compliance issues if payroll is not reviewed properly. Director salaries, benefits, pensions and expenses can also require careful handling.
For more detail, SCC has a helpful guide on cross-border payroll for UK and Irish operations.
If you have 2 companies, you need to understand how each one is performing on its own. You also need to understand the combined position.
That means management accounts should show:
This is not just about compliance. It helps you make better decisions.
You may find that one company is profitable but cash-poor. You may find that one jurisdiction carries more overhead than expected. You may also discover that transfer pricing, management recharges or shared costs need to be reviewed.
SCC’s SME Business Solutions service can help you put stronger reporting in place. Their article on how management accounts help SME owners also explains why regular reporting matters.
Both countries have company filing obligations.
In the UK, every company must file a confirmation statement at least once every year, even if it is dormant or non-trading.
Companies House also changed several fees from 1 February 2026, including the digital incorporation fee to £100 and the digital confirmation statement fee to £50.
In Ireland, the Companies Registration Office states that the annual return must be filed within 56 days of the date to which it is made up.
Missed deadlines can lead to penalties, stress and avoidable disruption. For a business operating across 2 systems, it is sensible to keep a shared compliance calendar covering Companies House, HMRC, CRO and Revenue deadlines.
Setting up in both the UK and Ireland may open the door to valuable tax planning opportunities, but you need to know what applies and what evidence is required.
This could include capital allowances, R&D tax credits, grant funding, business asset planning, or reliefs linked to investment and innovation.
SCC’s Specialist Tax team can help you review whether your business is making full use of available reliefs. You may also want to read SCC’s guides on R&D tax credits in the UK and Ireland and capital allowances.
A cross-border structure can work well, but it also creates more moving parts.
If records are unclear, shareholders disagree, cash flow tightens, or there are concerns around financial accuracy, you may need specialist support beyond routine accounting.
For example, forensics accountants can help where financial information needs to be investigated, explained or presented clearly in a dispute. If the business is under pressure, recovery accounts UK support can help you review cash flow, restructuring options and the wider financial position.
You may also need Corporate Finance advice if the structure is part of a larger investment, acquisition, sale or expansion plan.
Not always. It depends on where you trade, where your staff work, where your customers are, and what commercial presence you need. Some businesses can trade cross-border through 1 company, while others need separate entities for legal, tax, banking or operational reasons.
Possibly, but it depends on where profits arise and how the companies are structured. The key issue is not just where the company is registered, but where trading activity, management and value creation take place.
Yes. Each company should have its own records, bank accounts and reporting. However, your accounts should also be connected enough to show the wider group position, especially where there are intercompany transactions or shared costs.
It can be. Northern Ireland has particular VAT rules for goods because of its position after Brexit. Goods and services can be treated differently, so you should check each trading flow before assuming the VAT treatment.
Ideally, before you register the companies. Early advice can help you avoid the wrong structure, missed registrations, weak bookkeeping, incorrect VAT treatment and poor cash flow planning.
Setting up a company in both the UK and Ireland can give you a strong platform for growth, but only if the structure, tax registrations, bookkeeping and compliance are handled properly from the start.
SCC Chartered Accountants works across Northern Ireland, the wider UK and Ireland, giving you joined-up support for cross-border business decisions.
If you are planning to trade, employ, invest or expand across both jurisdictions, contact SCC Chartered Accountants today and get practical advice before you make your next move.
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