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Cross-Border

Cross-Border UK & Ireland Tax: The Basics for Mid-Ulster

15 September 2025 · 11 min read

Eoín Brannigan
Eoín BranniganDirector, Chartered Accountant

Mid-Ulster sits on a busy commercial corridor. Selling goods or services into Ireland, or employing people who live across the border, creates UK and Irish tax touchpoints that need early planning. Waiting until the first large invoice or first hire is how small issues become expensive ones.

Common pressure points

Typical questions include VAT place-of-supply rules, Irish VAT registration triggers, transfer pricing for related companies, permanent establishment risk if you have a fixed place of business, and payroll for cross-border workers. None of these are solved by a single spreadsheet, and assumptions from UK-only trading often break at the border.

If UK VAT registration is already on your radar because turnover is rising, read our note on VAT thresholds alongside any Irish VAT questions. The two systems interact in practice even when the rules sit in different statute books.

Goods, services and people

Goods moving across the border raise different issues from services delivered remotely. People commuting or relocating between Northern Ireland and Ireland raise payroll and social security questions that do not always match the invoice trail. Map customers, stock, people and invoices before you assume the old UK-only process still works.

Our Payroll support covers UK PAYE routines. Where Irish payroll advice is needed, we coordinate with specialists rather than guessing. The same principle applies to Irish company filings when a group structure sits on both sides.

How we approach it

We map your flows, identify where UK advice ends and Irish specialist input begins, and keep filings coordinated. That is the heart of our Cross-Border UK & Ireland Tax service for Mid-Ulster firms.

Corporation Tax and group planning often sit in the same conversation. If you are restructuring how the trade sits between entities, our Corporate Tax and Group Reorganisation pages outline how we handle the UK side.

Timing that actually helps

Get in touch before you sign a large cross-border contract. Structuring after the fact costs more in fees, cash flow and management time. A one-hour scoping call is usually enough to see whether the issue is a simple VAT point or a wider PE and payroll project.

Digital records still matter. If Making Tax Digital already shapes how you keep UK books, keep that discipline when Irish obligations appear, so you are not maintaining two incompatible ways of working. Contact us with a short map of where customers, stock and people sit.

"Get in touch before you sign a large cross-border contract. Structuring after the fact costs more."

Eoín Brannigan, Gortreagh Consulting

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