US Tax Services for Americans Living in the UK

Expert cross-border tax preparation with real accountants who understand both IRS and HMRC requirements – no bots, no hidden fees, just clear answers.

Living the dream... until tax season hits

You didn’t move abroad to become a tax expert, but suddenly you’re dealing with complexities most Americans never face:

Fallen behind on your US filings? We specialize in help for expats who need to catch up through streamlined procedures.

Monx specializes in the unique tax situation of Americans living in the UK

We handle the complexity so you can focus on your life abroad.

US Federal Tax Returns

Complete preparation and filing of Form 1040 with all necessary schedules for expats.

FBAR & FATCA Compliance

FinCEN Form 114 and Form 8938 filing to report foreign accounts and stay compliant.

Birth/Marriage Certificates

Coordinated filing with HMRC to ensure consistency across both tax jurisdictions.

Tax Optimization

Strategic use of Foreign Earned Income Exclusion or Foreign Tax Credits (Form 1116).

Streamlined Procedures

Specialized help for expats who need to catch up on unfiled returns without penalties.

Dual-Status Returns

Expert handling for your year of arrival or departure between the US and UK.

UK Pension Reporting

Proper treatment of UK pensions and tax-advantaged accounts for US tax purposes.

How It Works

Getting started is simple:

Book Your Free Consultation

Discuss your specific situation in a personalized 1-on-1 call with a tax expert.

Receive Your Quote

Clear, fixed pricing with no hidden fees or surprise bills later.

Gather Your Documents

We’ll send you a simple checklist of exactly what we need for your filing.

We Handle the Rest

Your dedicated accountant prepares and files everything for both IRS and HMRC.

Stay Compliant Year-Round

We’re here for questions anytime, with same-day responses to your queries.

Why choose Monx

We’re not your typical accounting firm. We’ve built our service specifically for the modern global citizen.

Cross-Border Expertise

We work across 10 countries including the US and UK, so we truly understand both systems.

Real Experts, Not Bots

You’ll work with experienced accountants who answer your questions in plain English.

Transparent Pricing

Fixed fees with no hidden charges or surprise bills at the end of the process.

Same-Day Response

We know time zones are tricky; we’re here when you need us with rapid responses.

Tailored Solutions

Every expat situation is different; we customize our approach to yours specifically.

Proactive Guidance

We don’t just file returns; we help you plan to minimize your tax burden legally.

What our clients say

Monx has expertly guided our business through multiple jurisdictions, managing both personal and corporate taxes with exceptional detail. They consistently go above and beyond to provide the best possible solutions.

Idon Liu

Co-Founder of Pentagon Games

I’ve been working with Monx for the past four years, and they have been an invaluable partner in managing my finances. As a small business owner, I rely on their expertise and attention to detail to ensure my books are in order and my taxes are filed properly. They are always responsive to my questions and take the time to explain things in a way that I can easily understand. Monx has saved me a significant amount of time and money, and I would highly recommend their services to any individual or business looking for a trusted accounting partner.

Alessandro Armandi

General Manager of The Place Ltd

Our business is complex, with assets in multiple currencies and digital assets. It was incredibly refreshing to find an accounting company with a genuine can-do attitude. Particularly at a price point that suited our SME needs. Highly recommended!

Jamie Turnough

Investment Operations Manager at SwissOne Holding

Monx team has been exceptional and I have no hesitation in recommending Monx for their accounting and related services to meet your business needs.

Wei Ng

Co-Founder and Group CFO at Pentagon Games

It is not easy to find such a reliable, knowledgeable, problem-solving, and friendly partner. Without a doubt, Monx Team is the best choice to guide you on your international journey and help you explore the most innovative business opportunities.

Andrea Rossi

Managing Director, Business Angel, Investor

Frequently asked questions

When do I need to file US taxes as an expat?

US citizens must file by June 15th when living abroad (automatic 2-month extension), with a further extension available until October 15th. However, any taxes owed are still due by April 15th to avoid interest charges.

What is FBAR and do I need to file it?

If your foreign bank accounts exceeded $10,000 in total at any point during the year, you must file FinCEN Form 114 (FBAR) by April 15th. This is separate from your tax return and has significant penalties for non-compliance.

Can I avoid double taxation between the US and UK?

Yes. The US-UK tax treaty and mechanisms like the Foreign Tax Credit and Foreign Earned Income Exclusion help prevent double taxation. We’ll determine the best strategy for your situation.

How does the Foreign Earned Income Exclusion work?

For 2025, you can exclude up to $132,900 of foreign earned income if you meet the Physical Presence Test or Bona Fide Residence Test. We’ll help you qualify and claim this benefit.

What happens if I'm behind on US tax filings?

The IRS Streamlined Filing Compliance Procedures allow eligible expats to catch up without penalties. We’ll assess your situation and guide you through the process.

Do I need to report my UK pension to the IRS?

Yes. UK pensions must generally be reported to the IRS, though they may receive favorable tax treatment under the US-UK tax treaty. We ensure proper reporting and treaty benefit claims.

Which accounting software do you work with?

We work with all major accounting platforms to integrate seamlessly with your existing systems.