International Tax Advisory

Navigate complexity with confidence. Strategic tax guidance for global businesses.

Operating across jurisdictions presents a wealth of opportunity, but also significant risk. With constantly shifting tax regulations, cross-border structures, and exposure to double taxation, even well-resourced in-house teams can struggle to keep up. That’s where GCO comes in.

Our international tax advisory services include:

International Tax Advisory Services

Concerned your international operations are creating tax exposure?

You’re expanding abroad but unsure how local tax laws will impact your group?
You suspect you may be exposed to double taxation but don’t have a clear diagnosis?
Your team is stretched and lacks the time or expertise to track complex cross-border rules?
You’re unclear on how new international tax frameworks like Pillar Two affect your structure?
You’ve received conflicting advice from different jurisdictions and need clarity?

Without the right partner, cross-border tax issues can quickly escalate into costly problems. That’s why international businesses turn to GCO—to ensure their operations are compliant, efficient, and strategically structured.

International Tax Advisory Services

Strategic tax planning & structuring

We design smart international tax structures that align with your business strategy, while ensuring tax efficiency and legal compliance.

Cross-border tax planning and structuring
Create solid international frameworks that minimise tax liabilities and support long-term expansion, while reducing exposure to double taxation and enabling more efficient repatriation of profits.

International holding and investment structuring
We design cross-border investment and holding structures that optimise flows, safeguard assets, and reduce tax inefficiencies across jurisdictions.

Exit tax and restructuring advisory
We advise on mergers, exits, share transfers, and business restructurings across jurisdictions to ensure tax exposures are identified early and costly surprises are avoided during strategic transitions.

International Tax Advisory Services

Compliance and reporting across jurisdictions

We handle the regulatory complexity so your operations stay compliant in every country where you operate.

International tax compliance and reporting
We manage global tax filings, disclosures and statutory obligations with clarity and consistency, helping you meet local requirements on time and avoid penalties, reputational risk and regulatory setbacks.

Tax treaty application and withholding tax relief
We apply double tax treaties to reduce withholding on dividends, interest and royalties, preserving cash flow and minimising unnecessary tax leakage across borders.

OECD Pillar Two and BEPS advisory
We interpret and implement strategies aligned with global minimum tax and anti–base erosion rules, helping your group stay compliant, avoid risk and adapt confidently to international tax reform.

International Tax Advisory Services

Risk management and dispute support

We identify tax exposure before it becomes a liability—and defend your position when needed.

Permanent establishment (PE) risk assessments
We assess whether overseas operations create a taxable presence and advise on restructuring where needed, helping you stay compliant and avoid hidden tax liabilities.

Transfer pricing advisory
We develop compliant, defensible intercompany pricing policies and documentation to reduce audit risk, prevent disputes, and meet local and OECD standards.

International tax audit and dispute support
We support clients through foreign tax inspections and represent their interests before tax authorities, providing expert guidance to navigate complex challenges with confidence.

Uncertain about your global tax exposure?

Let GCO’s international tax specialists review your current structure and show you where to optimise.

Why partner with GCO?

When your business crosses borders, trust matters more than ever

Here’s why GCO is the partner of choice for internationally active companies:

Specialists in multinational structures: Our tax advisors understand the intricacies of group structures, joint ventures, and international subsidiaries.
Cross-European legal network: As part of IUSFUL European legal network, we offer coordinated support across multiple jurisdictions.
Over 45 years of advisory excellence: Since 1978, we’ve guided businesses through complex financial and legal landscapes.
Respected & regulated: We’re members of the Ilustre Colegio de Economistas de Cataluña, AEDAF and Colegio de Graduados Sociales of Barcelona.
Full-scope expertise: We work hand-in-hand with our labour, financial, and corporate teams to provide unified international advice.

International Tax Advisory Services

“We already have in-house tax advisors—why do we need GCO?”

Your in-house team is a valuable asset. But when it comes to international tax, even the most capable departments can face limitations. Cross-border rules evolve quickly, and keeping pace with global frameworks such as BEPS 2.0, Pillar Two, and tax treaty changes requires specialised, up-to-date expertise.

GCO does not replace your internal team. We enhance it. Acting as a strategic extension, we bring jurisdiction-specific insight and advise on complex structuring, transfer pricing, and compliance challenges that often require external perspective. Our aim is to strengthen your existing capabilities, reduce uncertainty, and provide clarity where it matters most.

With GCO, you receive senior-level guidance that supports your wider commercial objectives, not just technical compliance.

Process and Methodology

A Clear Path to Excellence for your Company

Our customer-centric process is tailored to your specific needs. From initial analysis to strategy implementation, we are with you every step of the way.

FREQUENTLY ASKED QUESTIONS

Answers to your key questions about international tax advisory

What is international tax advisory, and why is it important?

International tax advisory helps businesses manage the tax impact of operating across borders. This includes structuring, compliance, and planning to reduce tax exposure and ensure alignment with both local laws and international standards.

Which businesses should consider international tax advisory services?

Any business operating in more than one country can benefit — whether through foreign subsidiaries, remote teams, suppliers, clients, or holding structures. International tax advisory becomes especially important during expansion, investment, or restructuring.

Can small international operations still create tax risk?

Yes. Even a remote employee, sales agent, or occasional cross-border transaction can trigger tax obligations in another country. Early advisory helps you stay compliant and build a scalable structure from the start.

How can international tax planning help reduce tax exposure?

Tax planning ensures your structure aligns with local laws, international treaties, and OECD frameworks. This helps prevent double taxation, permanent establishment risk, and inefficient profit flows — while reducing the chance of costly surprises.

How do you help prevent double taxation?

We assess your global structure, apply relevant tax treaties, evaluate residency and PE status, and recommend strategic adjustments to reduce or eliminate double taxation on income or profits.

Can GCO support us during international tax audits or disputes?

Absolutely. We assist clients during foreign tax audits, inspections, and disputes. This includes reviewing documentation, managing communication with authorities, and helping to resolve issues efficiently.

How does GCO manage tax compliance across multiple countries?

We coordinate international tax advice through our European legal network and trusted partners in key jurisdictions. You get consistent, practical support through one point of contact — ensuring your global operations remain aligned and compliant.

Integrated advisory beyond international tax

GCO supports your strategy at every level

Tax investigations and enquiries
We represent clients in tax audits, information requests and enquiries from Spanish and international tax authorities. Our support ensures timely, strategic responses that protect your position and minimise disruption.

Group tax consolidation
We help multinational groups take advantage of tax consolidation regimes, simplifying reporting and optimising tax positions across entities.

Inheritance and succession planning
We provide cross-border succession and estate planning for business owners and international investors, helping you protect assets and ensure smooth generational transitions.

Corporate advisory
We assist with company formation, international contracts, governance, and legal structuring to support expansion and operational clarity.

Find out how our consulting services can help you

Optimize your Business Strategy