UK vs Ireland tax guide for consultants and small companies in 2026

The UK and Ireland invite very different first impressions. In the UK, the company-rate story is now mainly 25% with a 19% small-profits rate and marginal relief between the bands where the rules permit it. In Ireland, the crucial split is not small versus large profits but trading versus non-trading income: trading income is generally taxed at 12.5%, while certain non-trading income is generally taxed at 25%. That means Ireland can look much cheaper for the right kind of company, but only if the profits really are the type the Revenue guidance says they are.

The UK keeps the familiar 20%, 40% and 45% pattern in most of the country, whereas Ireland still runs through its 20% standard rate and 40% higher rate structure. But the Irish system forces a practical extra step because PAYE workers also have to think about USC and PRSI, not only income tax. That makes the salary budgeting conversation in Ireland less clean than a quick rate comparison suggests. In the UK, the complication often shows up elsewhere instead: personal allowance tapering, Self Assessment, and the interaction between salary, dividends and company extraction strategy.

This is where many small companies and consultants make a better decision. The UK's compulsory VAT registration threshold is currently £90,000, while Ireland's main thresholds differ by activity, with €42,500 for services-only businesses and €85,000 for goods businesses under the current Revenue guidance. The filing rhythm also differs. In the UK, corporation tax payment and filing have their own timetable and VAT can become a rolling obligation as soon as scale arrives. In Ireland, corporation tax is generally paid and filed within nine months after the accounting period end and VAT is usually handled on a bi-monthly cycle. So the real comparison is not only 'Where is the rate lower?' but 'Which system fits the business model, the payroll plan and the admin tolerance of the founder?'