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🇺🇸 🇬🇧   United States & United Kingdom

US & UK Tax Filing for Individuals & Businesses

Comprehensive personal and business tax filing services for both the United States and the United Kingdom. Whether you owe taxes to the IRS, HMRC, or both, we prepare and file your returns accurately and on time — keeping you compliant on either side of the Atlantic.

File My Taxes → All Services
What It Is

One Partner for Both US & UK Taxes

Filing taxes in two countries means dealing with two very different systems — the IRS in the US and HMRC in the UK — each with its own forms, deadlines, and rules. For founders, freelancers, and businesses operating across both, that complexity adds up fast.

We handle personal and business tax filings for both jurisdictions, including US federal and state returns, UK Self Assessment, and company tax filings. Where your income touches both countries, we help you apply tax treaties and foreign tax credits so you don't pay tax twice on the same income.

CoFilings® reviews your situation, prepares accurate returns for each country, and files them on time — so you stay compliant with both the IRS and HMRC without the headache of juggling two systems.

What's Included

✓ Review of your US & UK tax obligations
✓ US federal & state income tax returns
✓ UK Self Assessment filings
✓ Business & company tax returns
✓ Double-taxation & tax treaty guidance
✓ Deductions, reliefs & credits review
✓ Filing with the IRS and HMRC
✓ Deadline reminders & filing confirmation
Why It Matters

Cross-Border Taxes, Handled Right

Filing correctly in both countries keeps you compliant, avoids penalties, and stops you paying tax twice.

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Both Countries, One Team

Handle your IRS and HMRC filings together, without juggling separate providers.

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Avoid Double Taxation

We apply tax treaties and foreign tax credits so you're not taxed twice on the same income.

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Avoid Penalties

Beat both sets of deadlines and steer clear of late-filing penalties on either side.

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Maximize Reliefs

We review deductions, reliefs, and credits in each country so you don't overpay.

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Personal & Business

From individual returns to company filings, we cover both in either jurisdiction.

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Expert Guidance

Clear answers from professionals who understand both US and UK tax rules.

The Process

How It Works

Simple, fast, and transparent — get your US and UK returns filed in just four easy steps.

01
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Consultation

Tell us where you earn and live. We'll map out exactly what you need to file in each country.

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Document Prep

We gather your records, apply treaty relief, and prepare accurate returns for both countries.

03
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Fast Filing

We file with the IRS and HMRC and keep you updated on progress every step of the way.

04
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Filed & Confirmed

Receive your filing confirmations and copies. You're fully compliant in both jurisdictions.

FAQ

Frequently Asked Questions

Do I really have to file in both the US and the UK?
It depends on where you're tax resident, where you earn income, and your citizenship. US citizens generally file with the IRS regardless of where they live, and you'll typically file with HMRC where you're UK resident or earn UK income. We assess your situation and confirm exactly what's required.
Will I be taxed twice on the same income?
Usually not. The US–UK tax treaty and mechanisms like foreign tax credits are designed to prevent double taxation. We apply these correctly so income taxed in one country isn't fully taxed again in the other.
What is UK Self Assessment?
Self Assessment is HMRC's system for reporting income that isn't taxed automatically through payroll — such as self-employment, rental, or business income. If you're required to file, we prepare and submit it for you before the deadline.
Are the US and UK tax deadlines the same?
No. The two countries have different tax years and filing deadlines, and the UK tax year doesn't align with the calendar year. We track both sets of dates and remind you well in advance so nothing is missed.
Can you handle both personal and company filings?
Yes. We file individual returns and business or company tax returns in both jurisdictions, and can coordinate them so your personal and business taxes stay consistent.
I'm behind on filings in one country — can you help?
Yes. We can help you catch up on overdue US or UK filings and get back into compliance, while minimizing penalties where possible. Reach out and we'll review your situation.

Ready to File in the US & UK?

Let CoFilings® handle your IRS and HMRC filings together, accurately and on time, so you stay compliant in both countries.

Get Started Now →