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UK Corporation Tax Services for Overseas-Based Tax Teams

If you’re responsible for the tax compliance of a UK subsidiary as part of your group headquarters overseas, we understand the pressures you face: dealing with unfamiliar tax rules, understanding UK reporting deadlines, and ensuring your group remains fully compliant across jurisdictions.

At Türner & Co, we work exclusively with international groups that have a UK subsidiary or UK permanent establishment. Our clients often tell us how much they value working with a UK advisor who understands their perspective and proactively helps them manage UK tax compliance with minimal fuss.

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+44 (0) 1636 526 075

What Is UK Corporation Tax and Who Is Liable?

In the UK, corporation tax is charged on the worldwide profits of UK-resident companies. Non-resident companies are liable for UK corporation tax on:

  • Trading profits attributable to a UK permanent establishment (PE)
  • Profits from trading in or developing UK land
  • UK property rental business profits
  • Gains from UK property disposals (direct or indirect)
  • UK-source income not otherwise taxed


The current corporation tax rate is:

  • 25% for profits over GBP 250,000
  • 19% for profits up to GBP 50,000 
  • Marginal relief for profits between GBP 50,000 and GBP 250,000


These thresholds are reduced based on the number of associated companies worldwide.

An Overview of the UK Corporation Tax Compliance Cycle

The UK operates a self-assessment regime. This means your UK subsidiary is responsible for ensuring its tax return is complete and correct. The UK tax authorities – HMRC – will not issue an assessment or confirm acceptance of the return.

The corporate tax compliance cycle includes:

1. Tax Registration

We register the company with HMRC for corporation tax as part of our onboarding.

2. Filing the Corporation Tax Return

The tax return consists of:

  • The CT600 form (the return itself)
  • The tax computation
  • Statutory accounts in iXBRL format

 
All of this must be submitted online within 12 months of the period end.

3. Payment Deadlines

Corporation tax must be paid:

  • 9 months and 1 day after the period end for smaller companies
  • Quarterly Instalment Payments (QIPs) apply to large companies:
    • For profits > GBP 1.5m (divided by number of group companies)
    • First payment is due in month 7 of the accounting period
    • Accelerated payment timetable for companies with profits > GBP 20 million


We will help you monitor payment deadlines and ensure accurate and timely payments.

Our Services

Full Compliance Support

  • Corporation tax registration
  • Preparation of the tax computation and CT600
  • iXBRL conversion and online submission
  • Monitoring of payment deadlines
  • Group reporting packs for head office

Cross-Border Transaction Support

  • Withholding Tax reviews
  • Exemption applications for cross-border loans and royalties
  • Assessing permanent establishment risk

Tax Residence Determination

  • We assist where the UK company might also be tax resident elsewhere under local law. Most double tax treaties rely on the Place of Effective Management as a tie-breaker test.

Pillar 2 Compliance

  • Assistance with understanding UK filing obligations
  • Managing timelines and information gathering

Tax Enquiries

  • If HMRC opens a review, we will liaise with them on your behalf. Most enquiries are routine, and we will manage them efficiently.

Why Work With Us?

We only work with international groups

Our team is made up of ex-Big Four professionals

We understand the pressures you face and how to integrate with your group reporting

We pre-empt problems and help you avoid common pitfalls

FAQs

Under UK law, yes. But if the subsidiary is also tax resident elsewhere, we need to consider the double tax treaty.

Yes. We offer support with both.

Contact Our Experts

Sarah English

Senior Manager

Head of Direct Taxes

sarah.english@tuerner.com
+44 (0) 1636 526 075

Phil Walker

Assistant Manager

Management Reporting, Statutory Accounts & Corporate Income Taxes

phil.walker@tuerner.com
+44 (0) 1636 526 075

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