Cross-Border Tax Companies in Birmingham: Guide to Specialist Companies (2026)
AC
Acumon Chartered Accountants·14 min read
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 operations and manages tax exposure across different jurisdictions.
Birmingham is home to a wide range of cross-border tax advisers, from global professional services networks to independent tax specialists and regional accountancy firms. Each provider brings different strengths across areas such as international corporate tax, transfer pricing, global mobility, double taxation and cross-border transactions.
This guide highlights a selection of cross-border tax services companies operating in Birmingham. Rather than ranking providers, the aim is to offer practical context – outlining who these firms are, the types of businesses and individuals they typically support, and the areas of international tax where they are most active.
Acumon
Acumon is a UK firm of chartered accountants providing cross-border tax services to businesses, international groups and individuals.
The firm advises inbound overseas businesses establishing operations in the UK, UK companies expanding internationally, and clients dealing with the interaction of treaties, withholding taxes and residence rules. These services are delivered by a team that includes Chartered Tax Advisors and professionals with prior HMRC experience, and are available to clients across the UK, including in Birmingham.
Cross-border tax issues often arise at the points where different national systems meet: structuring UK operations for overseas groups, relieving double taxation on income earned in more than one jurisdiction, and ensuring the overall position remains coherent rather than optimised only on one side. Acumon coordinates with overseas advisors so that UK compliance, treaty claims and intercompany arrangements fit the wider group picture.
International structures frequently combine UK operating companies with overseas holding or trading entities. The firm supports UK subsidiaries of international groups with full UK compliance aligned to group reporting timetables, permanent-establishment analysis, and proportionate documentation of intercompany arrangements.
Acumon also advises cross-border individuals on statutory residence, split-year treatment and related reliefs, while in-house specialists handle associated cross-border VAT and employment tax matters.
Cross-Border Tax Capabilities:
Acumon provides international and cross-border tax advice across a range of situations, including:
Inbound structuring for overseas groups (subsidiary, branch or permanent-establishment analysis)
Full UK tax compliance for UK subsidiaries of international groups
Double taxation relief and treaty claims (withholding tax reduction, reclaims and foreign tax credits)
Statutory residence and split-year advice for internationally mobile individuals
Review and documentation of intercompany arrangements
Coordination with overseas advisors
Cross-border VAT and employment tax support
These services help organisations and individuals manage UK and international tax obligations while reducing the risk of double taxation or unintended permanent establishments.
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
BDO
BDO combines a Birmingham office with an international tax practice that works with companies moving into and out of the UK. Its services include international corporate tax compliance, transfer pricing, cross-border structuring, withholding tax, controlled foreign company matters, profit repatriation, VAT and customs. The firm also advises businesses on financing and other tax considerations connected with international operations.
Cross-border employment is another substantial part of its offering. BDO’s Global Mobility team works on international assignments, short-term business visitors and related reporting and compliance, giving businesses a single provider for both corporate and workforce tax issues.
Address: Two Snowhill, Birmingham, B4 6GA, United Kingdom
Phone: 0121 352 6200
Claritas Tax
Claritas Tax is a specialist tax advisory firm with its roots and an office in Birmingham. Its corporate tax work includes international tax planning and transfer pricing, making the firm relevant to businesses that have overseas subsidiaries, foreign shareholders, intercompany transactions or plans to expand outside the UK.
The firm also works with individuals whose tax affairs extend outside the UK. Its private-client services include overseas tax advice, giving business owners and internationally mobile individuals access to personal and corporate tax expertise within the same specialist practice.
Key Facts:
Ideal for: Private businesses, business owners and internationally active individuals
Core services: Corporate and international tax, transfer pricing, overseas private-client tax and transaction tax
Specialization: Independent specialist tax advice
Location: Birmingham
Notable strength: Dedicated tax-focused team covering both business and personal international matters
Contact Information:
Website: claritastax.co.uk
Phone: 0121 726 1717
Address: Enterprise House, 115 Edmund Street, Birmingham, B3 2HJ
Deloitte
Deloitte’s international tax services cover many of the issues that arise when businesses operate across several jurisdictions. Its work includes international tax compliance, legal entity structuring, foreign tax credits, finance and treasury questions, supply chains, intellectual property structures, Pillar Two and tax support for international transactions and acquisitions.
Companies with employees moving between countries can also use Deloitte’s mobility services for tax, payroll, immigration and compliance support. This breadth makes the firm more suited to complex multinational arrangements where corporate structures and employee mobility need to be considered together.
Key Facts:
Ideal for: Large businesses and multinational groups with complex international structures
Core services: International corporate tax, global mobility, tax compliance, transaction tax and restructuring
Specialization: Multi-jurisdiction corporate and workforce tax
Location: Birmingham
Notable strength: Ability to combine tax with wider transaction, mobility and business advisory services
Contact Information:
Website: www.deloitte.com
Facebook: www.facebook.com/deloitteuk
Twitter: x.com/deloitteuk
LinkedIn: www.linkedin.com/company/deloitte
Address: Four Brindleyplace, Birmingham, B1 2HZ United Kingdom
Phone: +44 (0)121 632 6000
MHA
MHA provides international tax advice through its UK team and the wider Baker Tilly International network. Its services cover international tax compliance, cross-border acquisitions, overseas business structures, profit repatriation, transfer pricing, Pillar Two, global mobility and international indirect taxes.
The Birmingham office gives Midlands businesses local access to this wider international capability. The combination can be useful for owner-managed and mid-market companies that are moving into new countries but still want their primary UK tax relationship managed from Birmingham.
Key Facts:
Ideal for: Mid-market businesses, international groups and owner-managed companies
Core services: International tax compliance, transfer pricing, global mobility, cross-border M&A, VAT and customs
Specialization: International business tax through the Baker Tilly International network
Location: Birmingham
Notable strength: Local Birmingham delivery supported by advisers across multiple international markets
PwC works with organisations that need to manage tax across multiple countries, including international business structures, treasury arrangements, transfer pricing and indirect tax. Its international tax services address both the design of cross-border operating models and the reporting and compliance obligations that follow from them.
Its Birmingham office is one of the firm’s substantial UK regional operations. For companies with complex supply chains, financing arrangements or multiple subsidiaries, PwC can connect local Birmingham teams with specialists in other jurisdictions rather than treating the UK element separately.
Key Facts:
Ideal for: Multinationals and larger organisations managing tax across several jurisdictions
Core services: International tax, transfer pricing, international treasury tax, Pillar Two, indirect tax and compliance
Notable strength: International network combined with a large Midlands professional services presence
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
Cooper Parry
Cooper Parry’s international tax team works with UK companies expanding overseas, foreign businesses entering the UK and established multinational groups. Its services include international tax structuring, double tax relief, transfer pricing and tax planning connected with setting up operations in new countries.
The firm also covers expatriate and individual international tax issues, making it suitable where overseas expansion affects both the company and the people running or working within it. Cooper Parry has a Birmingham office at Two Chamberlain Square, providing businesses in the city with a locally accessible mid-market alternative to the largest international networks.
Key Facts:
Ideal for: Growing businesses, private companies and international groups
Core services: International tax structuring, transfer pricing, double tax relief, overseas expansion and expatriate tax
Specialization: Cross-border tax for entrepreneurial and mid-market businesses
Location: Birmingham
Notable strength: International corporate and individual tax within a mid-market advisory model
KPMG advises businesses on international and complex corporation tax, including the tax implications of investing, operating and expanding across borders. Transfer pricing and the tax treatment of international business structures form part of its broader business tax offering.
The firm also has international private-client capability for individuals whose assets, residence or business interests span more than one country. This combination can suit business owners and corporate groups that require substantial international resources rather than advice limited to one specific tax issue.
Key Facts:
Ideal for: Multinational businesses, international investors and private clients with complex cross-border affairs
Core services: International corporation tax, transfer pricing, business tax and international private-client advice
Specialization: Complex international tax structures and multinational groups
Location: Birmingham
Notable strength: Broad corporate and private-client international tax capability
Contact Information:
Website: kpmg.com
Facebook: www.facebook.com/KPMG
Twitter: x.com/kpmguk
LinkedIn: www.linkedin.com/company/kpmg-uk
Address: One Snowhill, Snowhill Queensway, B4 6GH , Birmingham, UK
Phone: +44 (0)121 232 3000
Dains
Dains has its head office in Birmingham and provides international tax support for both UK companies expanding abroad and foreign-owned businesses operating in the UK. Its international corporate tax work includes cross-border planning, double taxation issues and transfer pricing. The firm also advises on international VAT, customs and cross-border acquisitions.
Global mobility is part of the same offering, including permanent establishment risk, remote working, social security and cross-border payroll considerations. Dains works through AGN International when clients require assistance in overseas jurisdictions, while keeping the main relationship with its UK team.
Key Facts:
Ideal for: Midlands businesses expanding internationally and overseas groups establishing UK operations
Core services: International corporate tax, transfer pricing, VAT, customs, global mobility and cross-border M&A
Specialization: International tax for regional and owner-managed businesses
Location: Birmingham
Notable strength: Birmingham head office combined with access to the AGN International network
EY provides business tax, international tax, transaction tax, people advisory and tax compliance services for organisations operating across borders. The firm’s scale makes it particularly applicable when international tax forms part of a wider restructuring, transaction or operating-model project rather than being an isolated compliance question.
For private clients, EY also has dedicated US/UK cross-border tax services for business owners and individuals dealing with obligations in both countries. This can be useful for entrepreneurs whose personal residence, ownership interests and company activities create overlapping UK and US tax requirements.
Key Facts:
Ideal for: Multinational businesses, international transactions and private clients with US/UK tax exposure
Core services: International tax, business tax, transaction tax, compliance and cross-border private-client advice
Specialization: Large and complex multi-jurisdiction tax matters
Location: Birmingham
Notable strength: Corporate international tax combined with specialist US/UK private-client capability
Contact Information:
Website: www.ey.com
Facebook: www.facebook.com/EY
Twitter: x.com/EYnews
LinkedIn: www.linkedin.com/company/ernstandyoung
Address: One Colmore Square, Birmingham B4 6HQ
Phone: +44 121 535 2000
Grant Thornton UK
Grant Thornton’s international tax team supports businesses entering new countries, restructuring international operations and managing the tax consequences of overseas growth. Services include international tax structuring, financing, transfer pricing, Pillar Two, global compliance and international indirect taxes.
Global mobility is also available for businesses moving employees across borders. Combined with the firm’s Birmingham office, this provides a practical option for internationally active mid-market organisations that need several cross-border tax disciplines coordinated through one UK adviser.
Key Facts:
Ideal for: Mid-market businesses expanding, investing or restructuring internationally
Core services: International corporate tax, transfer pricing, Pillar Two, global mobility and indirect tax
Specialization: International expansion and restructuring
Location: Birmingham
Notable strength: Combination of international corporate tax, employee mobility and global compliance services
Crowe UK advises businesses on international tax structures, cross-border acquisitions, disposals and reorganisations. Its international tax team also helps companies consider their overall tax footprint and coordinate compliance across jurisdictions, rather than looking only at individual overseas subsidiaries.
The wider tax practice includes global mobility, VAT, customs and international trade, allowing corporate tax questions to be considered alongside the movement of employees and goods. Crowe has a Birmingham office at One Colmore Row and professionals in the Midlands working on both domestic and international corporate tax matters.
Key Facts:
Ideal for: International businesses, corporate groups and companies undertaking cross-border transactions
Core services: International corporate tax, global tax compliance, transaction tax, global mobility, VAT and customs
Specialization: Cross-border corporate structures and transactions
Location: Birmingham
Notable strength: Ability to combine direct tax with international trade and mobility considerations
RSM’s international tax services cover global tax compliance, international tax planning, transfer pricing and global mobility. The firm works with businesses operating across several markets as well as companies preparing to expand beyond their domestic tax environment.
Its Birmingham office at 103 Colmore Row gives Midlands companies local access to those services. RSM’s positioning is particularly applicable to mid-market groups that have moved beyond relatively simple UK-only tax requirements but may not need the operating model associated with the largest global professional services firms.
Key Facts:
Ideal for: Mid-market international businesses and groups expanding overseas
Core services: International tax advisory, tax compliance, transfer pricing and global mobility
Specialization: Cross-border tax for internationally active middle-market organisations
Location: Birmingham
Notable strength: International network with an established Birmingham tax and advisory team
Forvis Mazars provides international tax services covering cross-border structuring, global tax compliance, transfer pricing, Pillar Two, global mobility and indirect tax. Its offering extends from routine multi-country reporting to questions around how international businesses organise their legal entities and transactions.
The firm also works with private clients facing tax issues across different jurisdictions, which may be useful when company ownership and personal wealth have international elements. Its Birmingham team operates from Three Chamberlain Square, giving clients access to local advisers backed by a broader international network.
Key Facts:
Ideal for: International groups, growing businesses and private clients with multi-country tax requirements
Core services: International structuring, transfer pricing, global compliance, Pillar Two, global mobility and indirect tax
Address: 3 Chamberlain Square, Birmingham B3 3AX, United Kingdom
Phone: +44 (0) 121 232 9500
S&W Group
S&W Group provides international tax support for businesses entering the UK, UK companies expanding overseas and organisations completing international acquisitions. Its services cover international tax structuring, corporation tax compliance, treaty qualification, transfer pricing, VAT, customs and global mobility.
The firm also has US/UK private-client tax capability, including advisers working with entrepreneurs and internationally connected individuals. For businesses where company ownership and personal tax obligations cross the same borders, having both areas available through one advisory group can simplify coordination.
Key Facts:
Ideal for: Mid-market companies, internationally active owners and inbound or outbound businesses
Core services: International corporate tax, transfer pricing, treaty advice, global mobility, VAT and customs
Specialization: Integrated business and private-client cross-border tax
Location: Birmingham
Notable strength: Business tax and international private-client expertise available through the same group
Cross-border tax requirements vary considerably depending on whether a business is establishing its first overseas operation, managing an established multinational structure, moving employees between countries or completing an international transaction. Birmingham businesses can choose between large global networks, mid-market accounting groups and specialist tax firms, with differences in areas such as transfer pricing, global mobility, private-client work, VAT and transaction support.
The right fit depends on the jurisdictions involved, the complexity of the ownership structure, the amount of ongoing compliance required and whether personal and corporate tax issues need to be managed together. Businesses should also consider whether they want advisers physically based in Birmingham or are comfortable working with a UK tax team remotely.
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.
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…
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…
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.
