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Cross-Border & Expat Taxation
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Cross-Border & Expat Taxation

US outbound and inbound tax planning for citizens living abroad, foreign nationals investing in the US, and families with ties in more than one country.

Cross-Border & Expat Taxation

Treaty-Led

Strategy Design

The US is one of the few countries that taxes its citizens on worldwide income, no matter where they live or work. If you earn abroad, that creates a real risk of double taxation. The tools that prevent it are treaty analysis, exclusions, and foreign tax credits, and each has to be applied correctly for your situation.

Our cross-border practice advises US individuals moving abroad and foreign nationals investing in the US. The core of the work is reconciling your US obligations with the rules of the country where you live, so the two systems do not tax the same income twice.

Our Methodology

How we deliver this service.

A rigorous, phase-driven process ensures nothing is missed and every position is defensible.

01

Residency & Nexus Audit

We determine your tax residency status under US domestic law and 'tie-breaker' treaty rules to identify your primary filing obligations.

02

Global Asset Mapping

We review all foreign bank accounts, pensions, and business interests (CFC/PFIC) and map the US reporting each one requires.

03

Treaty Analysis

Our team reviews applicable US tax treaties to identify relief for specific income types, including pensions, social security, and royalties.

04

Tax Modeling & Exclusion

We model the Foreign Earned Income Exclusion (FEIE) against Foreign Tax Credits (FTC) to see which saves you more.

05

Strategic Catch-up

For taxpayers with historical omissions, we design a catch-up strategy using Streamlined or Delinquent filing procedures.

06

Continuing Compliance

We manage the annual filing of Form 1040/1040-NR and all international disclosure forms (5471, 8865, 8621, 3520).

Reducing the US tax bill for expats.

Outbound Strategy

US Citizens & Residing Abroad

Reducing the US tax bill for expats.

Living abroad doesn't mean paying double tax, but it does mean filing twice. We use the Foreign Earned Income Exclusion (Section 911) and the Foreign Tax Credit (Section 901) to remove US tax on foreign-sourced income. The choice between credit and exclusion matters: in high-tax countries, the credit almost always produces a better long-term result because unused credits carry forward.

We also handle the US reporting for foreign pensions (SIPPs, RRSPs, Superannuation) and check that your local investments don't fall into the Passive Foreign Investment Company (PFIC) rules, which carry punishing US tax rates.

Expat focus: Section 911 (Exclusion), Section 901 (Credits), Form 2555, Form 1116, and PFIC (Form 8621) mitigation.

Withholding relief for inbound investors.

Inbound Compliance

Foreign Nationals Investing in US

Withholding relief for inbound investors.

Foreign nationals investing in US real estate or businesses run into withholding rules under FIRPTA (Section 1445) and standard NRA withholding (Section 1441). Without a treaty position, up to 30% of your gross income or 15% of your sales price can be withheld at the source.

We help foreign investors get ITINs, file Form 1040-NR, and apply tax treaties to reduce or eliminate withholding. We also structure inbound investments through blockers or tiered entities to limit US estate tax exposure for non-resident aliens, whose exemption starts at just $60,000.

Inbound focus: Form 1040-NR, FIRPTA (Form 8288), ITIN applications (W-7), and US estate tax planning for high-net-worth NRAs.

Leaving the US tax system cleanly.

Expatriation Strategy

Departure Tax & Expatriation

Leaving the US tax system cleanly.

Giving up a US passport or green card (expatriation) is a major tax event. Permanent residents who have held a green card for 8 of the last 15 years are 'Long-Term Residents' (LTR) and may face the Section 877A 'Exit Tax', which treats all global assets as sold on the day before departure.

We run the pre-departure modeling that determines 'Covered Expatriate' status, and where it helps, use gifts or trusts to bring your global net worth below the $2M threshold. The aim is an exit that is compliant and costs you as little as possible.

Exit focus: Section 877A Exit Tax, Form 8854, 'Covered Expatriate' status modeling, and pre-departure wealth transfer.

Living or investing across borders?

Double taxation is avoidable with the right treaty positions. Talk to us before the two systems take a bite out of the same income.

What You Receive

Specific deliverables, precisely documented.

“The US tax system follows its citizens around the world. We make sure everything you hold abroad is reported correctly and taxed no more than it has to be.”

Form 1040 / 1040-NR

Dual-status or non-resident federal tax returns with treaty-based position disclosures (Form 8833).

Foreign Credit (Form 1116)

Foreign tax credit calculations across all categories (General, Passive, Resourced).

Expat Exclusion (Form 2555)

Application for the Foreign Earned Income Exclusion and Foreign Housing Exclusion/Deduction.

FBAR (FinCEN 114)

Reporting of all foreign financial accounts to FinCEN, with supporting documentation.

PFIC Reporting (Form 8621)

Basis tracking for foreign mutual funds and ETFs using MTM or QEF elections.

Exit Tax (Form 8854)

Final compliance filing for expatriates, including mark-to-market calculations on global assets.

FIRPTA Withholding Relief

Filing Form 8288-B to reduce the 15% federal withholding on US real estate sales by foreign owners.

ITIN Application (Form W-7)

Help for foreign nationals obtaining a US Individual Taxpayer Identification Number for reporting.

Common Questions

Technical clarifications.

Answers to the most frequently asked questions about how this service works in practice.

In most cases, no. Through the use of Foreign Tax Credits and Tax Treaties, we can usually eliminate double taxation. You will, however, have to *file* in both countries and technically reconcile the different tax years and rules.

When two countries claim you as a resident under their domestic laws, a tax treaty 'tie-breaker' rule determines your primary residence based on factors like your permanent home, center of vital interests, and nationality.

The penalties for failing to file an FBAR or Form 8938 are severe, starting at $10,000 per violation. We help taxpayers come forward voluntarily through catch-up programs to minimize or eliminate these penalties.

The US generally taxes foreign pension growth unless a specific treaty provides for deferral. We analyze your local pension structure (e.g., UK SIPP, Aus Super) to determine the US tax treatment of contributions and growth.

A Passive Foreign Investment Company is any foreign corporation where 75% of income is passive. Most foreign mutual funds and ETFs are PFICs, and they are subject to very high US tax rates unless specialized 'elections' are made.

Contact US/UK Cross Border Tax

Two Tax Systems, One Team

London Headquarters

4 Crown Place
London EC2A 4BT
United Kingdom

Manchester

CORE
Brown St, Manchester M2 1DH
United Kingdom

San Francisco

600 California St
San Francisco, CA 94108
United States

New York

33 Irving Pl
New York, NY 10003
United States

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