Cross-Border Tax Companies in the UK: Guide to Providers (2026)
AC
Acumon Chartered Accountants·13 min read
Cross-border tax can involve much more than filing returns in two countries. Businesses and individuals may need help with tax residence, treaties, withholding tax, transfer pricing, overseas expansion, international employment and the interaction between UK and foreign tax systems. The firms below provide different combinations of these services, so this is a practical selection rather than a ranking.
Acumon
Acumon is a UK firm of chartered accountants and tax advisers providing international and cross-border tax services to companies, individuals, and international corporate groups.
The firm works with organisations ranging from inbound overseas businesses establishing UK operations and UK companies expanding internationally through to UK subsidiaries of international groups, owner-managed businesses with cross-border interests, and internationally mobile individuals.
Cross-border tax advice is delivered by a team that includes Chartered Tax Advisors and professionals with prior HMRC experience, focusing on practical structuring, treaty relief, residence rules, and compliance.
Acumon advises across the full range of cross-border situations: structuring UK operations for overseas groups (subsidiary, branch or permanent establishment analysis), relieving double taxation through the UK’s extensive network of double taxation agreements (covering over 130 countries), handling treaty claims, withholding tax reductions and foreign tax credits, and coordinating UK compliance with overseas advisors.
The firm also supports residence and split-year analysis under the Statutory Residence Test, the 4-year Foreign Income and Gains (FIG) regime for qualifying new UK residents, intercompany arrangements reviewed against the arm’s-length standard, and related employment tax, PAYE and cross-border VAT matters.
International group structures frequently involve a combination of UK operating companies and overseas entities. Coordinating tax work across these structures requires familiarity with treaty provisions, permanent establishment risk, transfer pricing at a proportionate scale, and the interaction of UK and foreign tax systems.
Acumon works with finance teams, boards and individuals to support statutory tax compliance requirements while also helping organisations and people manage double taxation risk, strengthen cross-border reporting processes, and maintain defensible positions as they grow or relocate.
Cross-Border Tax Capabilities:
Acumon provides international and cross-border tax services across a wide range of organisational structures and situations.
These include:
Inbound overseas businesses establishing in the UK and UK subsidiaries of international groups
UK companies expanding overseas and groups with cross-border income streams
Cross-border individuals, expatriates and new UK residents (including Statutory Residence Test, split-year treatment and the 4-year FIG regime)
Intercompany arrangements, permanent establishment assessments and proportionate transfer pricing support
Coordination of UK tax compliance with overseas advisors and head-office reporting requirements
These services allow the firm to support groups and individuals operating across the UK and multiple international jurisdictions.
Regulatory Licences and Registrations:
Acumon holds several audit registrations that enable it to support organisations operating across multiple jurisdictions.
These include:
UK statutory audit registration
Public Interest Entity (PIE) audit licence
Jersey audit licence
Isle of Man audit licence
Cayman Islands audit licence
British Virgin Islands audit licence
These registrations allow the firm to provide audit services to groups that include entities in both the UK and key international financial centres.
Core Services:
In addition to statutory external audit, Acumon provides a range of services that support financial reporting and governance.
These include:
Statutory external audit
Group and subsidiary audits
Public Interest Entity (PIE) audits
Charity and not-for-profit audit
Audit of international group structures
Internal audit and governance reviews
Risk management and compliance support
Audit work is often delivered alongside discussions with management and boards regarding financial reporting processes and governance frameworks.
Many organisations initially encounter statutory audit requirements as they grow and exceed the audit exemption thresholds set out in the Companies Act.
Acumon works with businesses that are:
Approaching their first statutory audit
Preparing for external investment
Expanding into international markets
Operating within corporate group structures
Early engagement with an audit firm can help ensure that financial reporting systems and documentation are aligned with statutory audit requirements.
Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
Grant Thornton UK
Grant Thornton works with businesses at different stages of international expansion, from a first move outside the UK to established operations across several jurisdictions. Its international tax practice covers overseas structuring, corporate residence, permanent establishment risk, withholding tax, tax treaties and transfer pricing.
The firm also combines corporate international tax with global mobility and indirect tax work. For companies with operations in several countries, its Global Compliance Reporting Solutions service provides another route for coordinating reporting obligations across jurisdictions. Grant Thornton also has a dedicated UK-US tax service for individuals, entrepreneurs and families with obligations in both countries.
Key Facts:
Ideal for: Businesses expanding internationally and groups managing tax across multiple jurisdictions
Core services: International tax structuring, transfer pricing, corporate residence and treaty analysis
Additional support: Global mobility, international indirect tax and global compliance
Cross-border focus: Inbound and outbound business expansion
International reach: Grant Thornton network across more than 150 markets
Bishop Fleming advises both businesses and individuals on international tax matters. Its corporate work covers inbound and outbound investments, overseas branches and subsidiaries, transfer pricing, cross-border transactions, double taxation agreements and international funding structures.
For individuals, the firm handles tax questions connected with moving to or from the UK, residence and overseas interests. Bishop Fleming is also a member of Kreston Global, giving its UK team access to firms in other jurisdictions when an assignment requires coordinated advice outside the UK.
Key Facts:
Ideal for: Owner-managed businesses, international companies and individuals with overseas tax exposure
Core services: International business tax, personal tax, transfer pricing and double taxation advice
Business support: Overseas investment, branch and subsidiary creation and global transaction structures
Individual support: Residence and tax planning around international moves
Moore Kingston Smith provides international tax services for businesses operating across borders, including companies entering new markets and groups changing their international structure. Its work covers cross-border tax planning, corporate structures, withholding taxes and transfer pricing.
The firm also has a specialist UK-US tax team with professionals holding UK and US qualifications. That service covers matters including tax return compliance, foreign bank account reporting, tax credits and the application of the UK-US double tax treaty. Access to the Moore Global network extends its support to projects involving additional jurisdictions.
Key Facts:
Ideal for: International companies and clients with UK-US tax requirements
Core services: International tax planning, transfer pricing and corporate structuring
UK-US services: Dual-jurisdiction tax compliance and treaty matters
Cross-border focus: Expansion, restructuring and multinational compliance
International taxation is a central part of Sheltons Group’s practice. The firm works with internationally operating businesses and individuals and maintains offices in several jurisdictions, including the UK.
For individuals, its cross-border work includes treaty residence, tax issues arising when moving between countries and dual tax return filings. Its UK practice also handles corporate and personal compliance alongside international tax advice, which can suit clients that need ongoing UK support as well as guidance on the interaction between jurisdictions.
Key Facts:
Ideal for: Internationally mobile individuals and businesses operating in several countries
Core services: International tax advice, local tax compliance and cross-border planning
Individual services: Treaty residence, relocation tax issues and dual filings
International presence: Offices in multiple jurisdictions, including the UK
Address: 25 Eccleston Place, London, SW1W 9NF, United Kingdom
Kreston Reeves
Kreston Reeves has an international tax practice serving companies, investors and private clients. Business services include structuring investments and acquisitions across jurisdictions, international financing arrangements, VAT and duty matters, and support for cross-border transactions.
Transfer pricing is another part of the practice, including benchmarking, documentation and dispute-related support. For individuals, the team advises on UK tax residence, inbound and outbound moves and related personal tax obligations. Kreston Reeves works with other Kreston Global member firms when local expertise is required abroad.
Key Facts:
Ideal for: Growing businesses, international investors and private clients
Core services: International structuring, transfer pricing, cross-border transactions and personal international tax
Indirect tax support: International VAT and duty
UK presence: Offices across London and the South East
International network: Kreston Global
Contact Information:
Website: www.krestonreeves.com
Twitter: x.com/KrestonReeves
LinkedIn: www.linkedin.com/company/kreston-reeves
Phone: +44 (0)330 124 1399
Address: 2nd Floor, 168 Shoreditch High Street, London E1 6RA
UHY Hacker Young
UHY Hacker Young supports businesses entering overseas markets and companies managing operations across several jurisdictions. Its internationalisation services cover tax structuring, direct and indirect taxation, transfer pricing, customs and local compliance requirements.
The firm can also assist individuals planning temporary or permanent moves abroad. Cross-border assignments can be coordinated through UHY International, giving UK clients access to accounting and tax professionals in overseas markets rather than requiring them to source advisers independently in every country.
Key Facts:
Ideal for: SMEs and businesses planning international expansion
Core services: International tax planning, transfer pricing, indirect tax and customs
Individual support: Tax planning for overseas moves
Delivery model: UK advice combined with overseas member firms
Address: Quadrant House, 4 Thomas More Square, London
Phone: +44 20 7216 4600
PEM
Cambridge-based PEM has a dedicated international tax offering for companies and individuals. Its business tax specialists advise on overseas expansion, establishing international operations, cross-border transactions, transfer pricing, profit extraction and reporting requirements under UK and foreign rules.
The international practice also extends into employment tax, personal tax and VAT. This is useful where an overseas expansion affects several parts of the organisation at once, such as relocating employees while creating a new entity and dealing with cross-border VAT. PEM is part of Kreston Global and uses the network for support in other jurisdictions.
Key Facts:
Ideal for: Businesses expanding internationally and individuals with UK and overseas tax obligations
Core services: International business tax, employment tax, personal tax and VAT
Business focus: Cross-border transactions, overseas structures and transfer pricing
Address: Salisbury House, Station Road, Cambridge, CB1 2LA
RSM UK
RSM’s international tax practice works with companies investing into the UK as well as UK businesses expanding abroad. Its services include international tax planning, transfer pricing, holding company strategy, global mobility and coordinated international compliance.
For inbound businesses, the firm can advise on branch or subsidiary choices, registrations, payroll considerations and transfer pricing. Its global compliance operation also covers corporate, employment and indirect tax requirements. RSM states that its tax specialists work across more than 120 jurisdictions, making the service particularly relevant where a group needs coordinated support in several countries.
Key Facts:
Ideal for: Mid-sized and large businesses with multi-country operations
Core services: International corporate tax, transfer pricing and global compliance
Expansion support: Both inbound UK investment and outbound growth
Additional capabilities: Global mobility and VAT compliance
International reach: Tax specialists across more than 120 jurisdictions
Contact Information:
Website: www.rsmuk.com
LinkedIn: www.linkedin.com/company/rsm-uk
Instagram: www.instagram.com/rsm.uk
Address: 4th Floor, G1 5 George Square, Glasgow G2 1DY
Phone: +44 (0)141 285 3900
BDO UK
BDO’s corporate international tax practice deals with businesses ranging from companies making an initial move overseas to multinational groups with established operations. Its work covers transfer pricing, withholding taxes, cross-border financing, international VAT and tax issues connected with mergers and acquisitions.
International mobility and employment taxes can also be incorporated into an assignment. For organisations that prefer central coordination, BDO provides a UK point of contact while drawing on its international network for local tax expertise in other jurisdictions.
Key Facts:
Ideal for: Businesses with substantial or growing international operations
Core services: Corporate international tax, transfer pricing and cross-border finance
Additional services: International VAT, employment tax and mobility
Transaction support: International tax due diligence and acquisition structuring
International reach: BDO network operating across more than 160 countries
Address: 55 Baker Street, London, W1U 7EU, United Kingdom
Phone: 020 7486 5888
KPMG UK
KPMG UK’s international and complex corporation tax team supports businesses investing across borders, extending an existing international footprint or reviewing tax risks in multinational structures.
Its cross-border services cover permanent establishment risk, controlled foreign company rules, tax residence, treaties and foreign jurisdiction requirements. KPMG also advises on cash repatriation, cross-border financing and withholding tax implications. This corporate focus makes the practice particularly suited to organisations where international tax is closely connected with financing, group structure and wider tax governance.
Key Facts:
Ideal for: Large businesses and groups with complex international structures
Core services: International corporation tax, cross-border investment and tax risk
Specific areas: Permanent establishments, CFC rules, treaties and tax residence
Financing support: Cash repatriation, debt financing and withholding tax
UK location: Nationwide office network
Contact Information:
Website: kpmg.com
Facebook: www.facebook.com/KPMG
Twitter: x.com/kpmguk
LinkedIn: www.linkedin.com/company/kpmg-uk
Address: 1, St Peter’s Square, Manchester M2 3AE, United Kingdom
Phone: +44 (0)161 246 4000
Haines Watts
Haines Watts provides international tax planning for both companies and individuals. Corporate services include international ownership structures, profit repatriation, withholding taxes, double taxation relief and controlled foreign company matters.
Its personal international tax work covers individuals coming to or leaving the UK, while the firm’s international compliance service is designed for clients with obligations both domestically and abroad. Haines Watts also handles international tax investigations, giving clients access to support where cross-border arrangements or overseas tax matters lead to HMRC scrutiny.
Key Facts:
Ideal for: Owner-managed businesses, international companies and private clients
Core services: International tax planning and compliance
James Cowper Kreston works with UK businesses expanding overseas and international businesses establishing a UK presence. Its international business tax work includes reviewing double tax treaties, withholding taxes and transfer pricing strategies.
The wider international practice can also bring in indirect tax and global mobility specialists. This allows a business to consider corporate tax together with VAT and the tax implications of moving employees between countries. As a Kreston Global member, the firm can coordinate work with advisers in overseas markets when local tax input is needed.
Key Facts:
Ideal for: Growing UK companies and overseas companies entering the UK
Core services: International business tax, transfer pricing and treaty analysis
Additional support: Global mobility and indirect tax
Expansion focus: Overseas market entry and UK inbound investment
Address: 11th Floor, 30 Crown Place, London EC2A 4EB
Phone: +44 (0)203 817 9350
PwC UK
PwC’s international tax and treasury practice is aimed primarily at companies operating across multiple jurisdictions. It combines international tax advice with areas such as transfer pricing, tax controversy, legal services and indirect taxation.
The work is particularly relevant to organisations dealing with international reporting requirements, statutory filings and tax strategy across a multinational group. Its scale also means the firm can address cross-border tax alongside broader treasury and corporate considerations where international operations involve numerous entities or markets.
Key Facts:
Ideal for: Multinational businesses and groups with complex cross-border tax requirements
Core services: International tax and treasury
Related capabilities: Transfer pricing, indirect tax and tax controversy
Cross-border focus: Multi-jurisdiction compliance and international tax strategy
UK presence: National office network
Contact Information:
Website: www.pwc.com
Facebook: www.facebook.com/PwCUK
LinkedIn: www.linkedin.com/company/pwc-uk
Instagram: www.instagram.com/pwc_uk
Address: One Chamberlain Square, Birmingham, B3 3AX
Phone: +44 (0)121 265 5000
Lovewell Blake
Lovewell Blake provides international services to businesses exporting, importing, establishing UK operations or otherwise working across borders. Its business offering combines tax and accounting compliance with VAT advice, corporate structuring and support for overseas companies setting up UK subsidiaries.
The firm also advises individuals with international tax matters, including UK residence questions, overseas income and situations where tax obligations arise in more than one country. Lovewell Blake is a member of HLB International, which gives its UK teams access to advisers in overseas jurisdictions when international coordination is required.
Key Facts:
Ideal for: SMEs, overseas businesses entering the UK and individuals with international affairs
Core services: International tax, business compliance and cross-border VAT
Inbound support: UK subsidiary establishment and tax compliance
Individual support: Residence, overseas income and double taxation matters
Address: Bankside 300, Peachman Way, Broadland Business Park, Norwich, NR7 0LB
Conclusion
Cross-border tax services in the UK vary considerably in scale and focus. Some firms concentrate heavily on multinational corporate structures, transfer pricing and international reporting, while others combine business tax with advice for individuals moving between countries, overseas investors or owner-managed companies expanding internationally.
The right fit depends on the jurisdictions involved and the work required. A company establishing its first overseas subsidiary may value practical structuring and ongoing compliance support, while a multinational group may need transfer pricing, Pillar Two, international financing and multi-country coordination. Individuals may instead need residence, treaty and double taxation advice. Comparing those capabilities against the actual cross-border situation is more useful than choosing a provider on size alone.
AC
Written by the Acumon team
Acumon is an ICAEW-registered firm of chartered accountants and registered auditors
based in London, with offices in Pitstone, Aylesbury and Bournemouth. Need advice on
anything covered here? Talk to us.
Managing cross-border tax obligations in Birmingham is about more than meeting filing requirements – it can affect how efficiently a business expands internationally, structures overseas…
Cross-border tax matters can affect businesses expanding internationally, overseas groups entering the UK, internationally mobile individuals and families with assets or income in several…
Statutory Sick Pay (SSP) is the minimum an employer must pay an employee who is too ill to work. For 2026/27 it is £123.25 a week or 80% of the employee's average weekly earnings, whichever is…
Read article
Get in Touch
Ready for Accountants Who Move Your Business Forward?
Tell us what you need. Within one business day, a qualified accountant will be in touch to talk it through and give you a clear, fixed-fee quote — no obligation.
We use essential cookies to run this site, plus Google Analytics and Google Ads to
understand how visitors use it and measure our advertising — only with your consent. See our
Privacy Policy.
