UK taxation and compliance: for Irish residents and businesses with UK links
If you own a UK property, run a UK company, sell into the UK or earn there, you’re dealing with two tax systems that don’t share a calendar. The UK tax year starts in April, deadlines fall in different months, and Brexit added customs and VAT rules on top. We help you meet both sets of rules and avoid paying tax twice on the same income.
Two tax years, two calendars
The UK rules that matter, by situation
Pick the one closest to yours.
UK income and Self Assessment
UK rental income, self-employment or other UK income usually means a UK Self Assessment return.
- The UK tax year runs 6 April to 5 April
- Register with HMRC by 5 October after the year ends
- File online and pay by 31 January, with payments on account on 31 January and 31 July
- Making Tax Digital for Income Tax began in April 2026 for income over £50,000
A UK limited company
A company in the UK pays UK corporation tax and files with Companies House and HMRC.
- 19% on profits up to £50,000
- 25% on profits over £250,000, with marginal relief between
- Where the company is managed and controlled affects where it’s resident
VAT in the UK
Since Brexit, UK VAT is separate from Irish and EU VAT. A business selling in the UK may need to register there.
- The UK registration threshold is £90,000 of taxable turnover
- Businesses based outside the UK have no threshold
- The standard UK rate is 20%
- Returns are filed through compatible software under Making Tax Digital
Avoiding double tax
Ireland and the UK have a double taxation agreement. It lets you claim credit for tax paid in one country against the tax due in the other, so income isn’t taxed in full twice.
- Your residence decides which country has the main right to tax
- Credit has to be claimed on the return, it isn’t automatic
- Keep the UK tax paperwork for your Irish return
Ireland versus the UK at a glance
Ireland
- Tax year runs January to December
- 12.5% corporation tax on trading profits
- VAT thresholds of €42,500 and €85,000
- Income tax return due 31 October
United Kingdom
- Tax year runs 6 April to 5 April
- 19% to 25% corporation tax
- VAT threshold of £90,000
- Self Assessment due 31 January
One team for both countries
UK returns
Self Assessment and company filings prepared and submitted.
UK VAT
Registration and returns, including Making Tax Digital.
Double tax relief
Credits claimed on both sides, so you don’t overpay.
Two calendars, one view
Every UK and Irish date mapped for your situation.
Trading goods with the UK? See the VAT and customs checklist and EORI applications.
UK tax questions
Do I need a UK tax return if I live in Ireland?
Do I pay tax on the same income in both countries?
Does Making Tax Digital affect me?
Do I have to register for VAT in the UK to sell there?
Income or sales in the UK?
Tell us what you earn or sell there. We’ll set out what both countries expect.
Why Proper UK Tax Management Matters
Mastering your tax obligations builds a winning financial game plan for your enterprise:
Strategic Tax Planning
Optimize your deductible expenses and allowances legally to keep more profit working in your business.
Avoid HMRC Penalties
Never miss a filing deadline, ensuring your record stays spotless with regulatory authorities.
Time Efficiency
Free up hundreds of hours by outsourcing complex number-crunching to dedicated professionals.
Risk Mitigation
Safeguard your corporate reputation with accurate reporting that withstands rigorous HMRC reviews.
The 4 Core Pillars of UK Tax Compliance
Operating a registered business in the United Kingdom means maintaining strict alignment with key statutory systems:
Corporation Tax
Filing CT600 returns accurately on taxable profits within 12 months of your accounting period end.
VAT Returns
Submitting quarterly digital returns under Making Tax Digital (MTD) rules once threshold limits are met.
PAYE & Payroll
Real Time Information (RTI) reporting for employee wages, deductions, and statutory payments.
Statutory Accounts
Preparing balance sheets and profit/loss statements for submission to Companies House on schedule.
Our Simple 4-Step Engagement Process
We keep onboarding straightforward so you can delegate tax worries with absolute peace of mind:
Initial Review
We audit your current accounts, company structure, and outstanding HMRC obligations.
Tax Roadmap
Our experts build a customized calendar of filing dates and tax-saving opportunities.
HMRC Submissions
We compile figures and submit all corporate tax returns and VAT returns digitally.
Ongoing Advisory
Receive continuous year-round guidance and prompt answers to all tax queries.
Package Comparison & Inclusions
Choose the level of UK tax and compliance support that best matches your company size:
Standard Tax & Accounts
Designed for small businesses needing reliable annual statutory accounts and basic corporation tax filing.
Complete Growth Bundle
Comprehensive all-inclusive tax management covering corporate filings, VAT, payroll, and advisory.
Explore UK Taxation & Compliance Services
Select a specialized pathway below to view detailed workflows and regulatory guidance.
UK Corporation Tax Returns (CT600)
Professional computation of company profits and direct electronic filing of CT600 forms with HMRC.
VAT Registration & MTD Filing
HMRC VAT registration support and seamless Making Tax Digital quarterly submissions.
PAYE & RTI Payroll Management
End-to-end salary calculations, payslip generation, and Real Time Information reporting.
Director Self-Assessment
Personal tax return preparation and submission for company directors and high-net-worth individuals.
Companies House Compliance
Timely filing of confirmation statements and annual accounts to prevent company strike-off.
R&D Tax Credits Advisory
Identify qualifying research and development expenditures to claim valuable HMRC tax reliefs.
Cross-Border UK/Ireland Structuring
Specialist advice for businesses operating across both jurisdictions managing dual-tax responsibilities.
Transparent Accounting Fees
Fixed-fee pricing tiers with no hidden surprises for bookkeeping, payroll, and annual tax returns.
HMRC Tax Investigation Support
Expert representation and dialogue management should HMRC select your company for a random check.
Latest Insights & Guides
Expert articles on navigating HMRC rules, corporation tax changes, and statutory deadlines.
Navigating UK Corporation Tax Rates and Marginal Relief
A breakdown of how current UK tax thresholds and marginal relief calculations affect small business profits.
Making Tax Digital: Essential Steps for UK Business Owners
Learn how to transition your bookkeeping workflows to meet HMRC’s digital record-keeping mandates smoothly.
Managing PAYE Real Time Information (RTI) Deadlines
A practical guide on how to report employee salaries and deductions to HMRC on or before every payday.
Expanding Across the Irish Sea: UK & Ireland Tax Guide
Key considerations for Irish businesses trading into the UK market regarding VAT and permanent establishment.
Contact Us
Office Address
Unit 80, Cherry Orchard Business Park, D10NX96, Dublin 10, Ireland
Working Hours
Mon–Fri 9:00 AM – 6:00 PM
Email or Call Us
Email: moh@tasconsulting.ie
Mobile: +353 85 1477625