International tax can involve foreign income, residence and domicile, double-taxation agreements, cross-border business structures and overseas assets. This guide compares 10 London firms whose publicly described services are relevant to those issues.
If you need direct help with foreign income, residence, double-taxation or cross-border business tax rather than a comparison, book a call with Pearl Lemon Accountants.
For a defined UK-side cross-border engagement covering residence, foreign-source income, treaty questions or international company structures, see our international tax planning service. A written scope should identify any overseas advice needed as well as UK filing responsibilities.
International tax advice: a defined scope before you hire
The central question is not whether a firm calls itself an international tax accountant but which countries, entities and tax years it will analyse. A useful engagement letter specifies the residence review, income sources, tax treaty provisions to be considered, foreign taxes already paid, available evidence, local adviser coordination, filing responsibilities and written deliverables. Ask who is responsible for the overseas jurisdiction: UK tax advice does not by itself resolve another country’s domestic filing obligations.
For a founder moving abroad, record where directors work and make decisions, the company’s contractual location, any permanent-establishment exposure and potential payroll obligations before restructuring. For a family with foreign assets, coordinate with private-client advice on inheritance and trusts; compare our high-net-worth tax specialists and discuss a cross-border brief.
Cross-Border Accounting and Tax Planning in London
Cross-border accounting services can involve foreign income, overseas companies, residence questions, double-taxation agreements, international payroll, permanent-establishment risk and reporting across more than one jurisdiction. Businesses and individuals comparing cross-border tax accountants in London should look for advisers who can coordinate the accounting and tax position rather than treating each country in isolation.
What should you ask a cross-border tax accountant?
Ask which jurisdictions they regularly work with, whether they coordinate with local advisers where needed, how they handle foreign income and entity structures, and how they document relief under double-taxation agreements. For more complex cases, the quality of coordination can matter as much as the tax computation itself.
We compared publicly described international-tax service scope, London relevance and support for cross-border individuals and businesses. Disclosure: Pearl Lemon Accountants publishes this article and appears in the comparison; verify current credentials, pricing and availability directly with each firm.
International tax accountant checklist: residence, entities and double taxation
An ‘international accountant’ can mean anything from filing a UK return with overseas dividends to coordinating a multinational group’s tax position. The right London firm depends on whether you are an individual, a founder, an employer or a group of companies. Define the countries, entities, tax years and transactions before comparing prices.
What makes a cross-border engagement complex?
- Individual residence: UK statutory residence and other countries’ rules may both matter; a home address or passport does not settle every question.
- Foreign-source income: identify salary, dividends, rental income, capital gains and tax already withheld; treaty relief is not automatic.
- Companies operating abroad: assess where decisions are made, where work is performed and possible permanent-establishment, transfer-pricing or employer obligations.
- People and payroll: document where directors and staff physically work and any social-security or payroll registrations.
- Asset ownership: overseas property, trusts and investment structures can create UK reporting even where overseas tax has been paid.
Illustrative example: a UK company with a director overseas
A UK-incorporated company has a founder spending significant time working from another country. Before deciding the UK corporation tax return settles everything, a specialist may need to review tax residence, where the business is managed, local establishment risk, employment arrangements and whether advice is required in the other jurisdiction. The outcome turns on facts, not on a generic ‘digital nomad’ label.
2026 point for UK international private clients
Older summaries focused solely on ‘domicile’ can be dated: UK inheritance-tax rules use a long-term-residence framework for events from 6 April 2025, subject to transitional rules. Consult current HMRC guidance before acting.
What should an international tax accountant actually deliver?
Request a country-by-country responsibility list, tax-calendar dates, who handles local advice, written assumptions for treaty positions, filing scope and a process for exchanging sensitive records securely. Ask for experience with your particular country pair rather than broad claims of global expertise. For an initial discussion, speak to Pearl Lemon Accountants.
International tax and private-client planning
For high-net-worth clients, international reporting may be only part of the brief. Estate succession, trusts and UK residence history can require a broader adviser comparison: London tax planning services for high-net-worth individuals.
1. Pearl Lemon Accountants(UK)
Pearl Lemon Accountants provides international tax accounting support for individuals and businesses with cross-border tax requirements, including:
- Tax Advisory Services: Cross-border tax planning, residency, and domicile solutions.
- Business Structuring: Setting up UK operations for foreign businesses.
- Double Taxation Expertise: Resolving dual taxation complexities with international treaties.
- Expatriate Tax Services: Dedicated support for expatriates and non-domiciled individuals.
- VAT and Compliance: Complete support for businesses navigating London’s tax landscape.
2. Gerald Edelman(UK)
Gerald Edelman is well-known for its unique solutions for high-net-worth individuals and multinational businesses in London. Their key services include:
- Tax compliance and advisory for corporations and partnerships.
- Inheritance tax planning and family office services.
- International Tax Compliance: Expertise in structuring global operations and managing cross-border transactions.
With a focus on addressing the unique needs of London-based businesses, Gerald Edelman is a trusted choice for complex international tax solutions.
3. Elan Tax
Elan Tax delivers services with a strong focus on digital innovation and personalised solutions for clients in London. Their expertise includes:
- R&D tax credit advisory and corporate tax planning.
- International Tax Filing and Compliance Support: Efficient handling of cross-border filings and documentation.
- Assistance for foreign investors in setting up UK businesses.
Elan Tax’s attention to detail ensures that London-based clients remain compliant with both UK and global tax regulations.
4. Braant Accountants(UK)
Braant Accountants excels in providing customised services for small businesses and startups in London. Their international tax solutions cover:
- Tax advisory for small and mid-sized businesses expanding globally.
- Support for dual-tax treaties and overseas operations.
- Payroll and Compliance Management: Assistance with international employee tax requirements.
Their cost-effective solutions make them a popular choice for entrepreneurs and growing businesses in London.
5. PKF Littlejohn(UK)
Based in the heart of London, PKF Littlejohn is a trusted advisor for cross-border tax and audit services. Their offerings include:
- Corporate structuring for multinational enterprises.
- VAT advisory for import-export businesses.
- Tax Strategy Planning: Specific advice for reducing liabilities while ensuring compliance.
With a deep understanding of London’s regulatory environment, PKF Littlejohn provides effective solutions for international clients.
6. BDO UK(Global)
BDO UK is a prominent name in the accounting industry, offering a global network with local expertise in London. Their international tax services include:
- Cross-border mergers and acquisitions advisory.
- Transfer pricing compliance and documentation.
- Residency and Domicile Tax Advice: Specialised solutions for expatriates and foreign investors.
Their strong global connections make them a reliable partner for London-based businesses with international operations.
7. Azets
Azets offers smooth integration of technology with personalised accounting services in London. Their international tax capabilities include:
- Double taxation resolution and treaty advisory.
- Support for expatriates with UK tax obligations.
- Global Payroll Solutions: Assistance with managing tax obligations for international employees.
Azets is highly regarded for its ability to simplify international tax processes for clients across London.
8. RSM UK(Global)
RSM UK is a recognised leader in delivering high-value tax services customised to businesses with international reach. Their focus areas include:
- Tax compliance for multinational corporations.
- Strategic tax planning for cross-border investments.
- International Tax Audits: Expertise in managing audits and ensuring compliance.
RSM’s understanding of London’s tax framework ensures their clients remain ahead of regulatory requirements.
9. Fortis Accountants(UK)
Fortis Accountants in London provides expert tax solutions for global clients, including:
- Personalised tax advisory for expatriates.
- International property tax management.
- Cross-Border Payroll Services: Support for companies with multi-jurisdictional employees.
Fortis is a trusted choice for medium-sized businesses expanding their international footprint from London.
10. Abacus-ATS
Abacus-ATS has built a reputation for handling international tax matters with precision. The firm works closely with businesses that have overseas income, partnerships, or employees operating across borders. From non-resident tax issues to advice on international corporate structures, their accountants provide steady support backed by up-to-date expertise. They also assist with transfer pricing, VAT on imports/exports, and overseas tax filings — helping clients manage compliance without confusion.
Abacus-ATS understands the pressure international companies face when navigating tax across multiple countries. Their team helps simplify the process by focusing on the fundamentals: clear reporting, solid advice, and timely submissions. Whether you’re managing income from different countries or need help dealing with HMRC on foreign tax credits, they’ve supported many businesses that need clarity across more than one jurisdiction.
Frequently Asked Questions
How do double taxation agreements help me?
Double taxation agreements help individuals and businesses avoid being taxed twice on the same income. These treaties ensure fair tax allocation between two countries.
How do international tax accountants assist expatriates?
International tax accountants provide customised support in understanding residency rules, filing requirements, and cross-border income declarations for expatriates.
What should I consider when choosing an international tax accountant in London?
Look for expertise in cross-border regulations, double taxation treaties, and residency laws, as well as the accountant’s familiarity with industries similar to yours.
