British Citizens Moving to the United States: A Corrected UK–US Tax & Residency Guide (2026 Update)

 Relocating from the UK to the United States involves synchronising two very different systems of tax, immigration status, and residency determination. This guide provides a corrected, fact-checked overview based on guidance from HMRC, IRS, USCIS, and U.S. state tax authorities as of late 2025.

UK Residence: When Do You Stop Being Tax Resident?

The UK uses the Statutory Residence Test (SRT) to determine tax residency.

If you leave mid-tax year, you may qualify for split-year treatment. This means only part of your income is taxed in the UK, and you must report it via Self Assessment.

UK rental income remains taxable in the UK after you move.

Other UK-source income, such as interest or dividends, may be classified as disregarded income for non-residents and may not be subject to UK tax.

US Immigration Status: What You Can and Cannot Do

Your immigration status governs what you may lawfully do in the US—not the number of days present.

Visitors under ESTA or B-1/B-2 may attend meetings, conferences and training but cannot perform productive work for a US entity. Limited remote work for a UK employer may be acceptable if it is incidental and not for the benefit of a US business.

Work-authorised visa options include:

• E-2 Treaty Investor (UK eligible)

• L-1 Intracompany Transfer

• O-1 Extraordinary Ability

• H-1B Speciality Occupation

These visa categories allow employment and permit the individual to obtain a Social Security Number (SSN).

US Permanent Residence: No “6-Month Rule”

Becoming a lawful permanent resident (Green Card holder) makes you a US tax resident unless an exception applies. There is no statutory requirement of 6 months’ physical presence per year, but extended absences and a lack of ties may lead to a finding of abandonment of status.

The Trump “Gold Card” Initiative: High Risk & Legally Unsettled

The so-called Gold/Platinum Card initiative announced in December 2025 is not an established immigration category under the US Immigration and Nationality Act.
The suggested benefits—such as annual US stays up to 270 days without triggering tax residency—conflict with existing IRS rules under IRC §7701(b). Treat this programme as uncertain, non-final, and subject to legal challenge.

US Tax Residency Rules

You become a US tax resident if:

1. You hold a Green Card; or

2. You meet the Substantial Presence Test (SPT).

Exceptions such as:

• the closer connection exception

• treaty tie-breaker provisions

• first-year election

may modify taxation outcomes.

You must have an SSN or ITIN to file a US tax return.

UK vs US Tax Rates

UK income tax reaches 45% at higher levels; US federal rates top out at 37%, but state taxes must be added.
States such as California and New York have high income tax rates and aggressively enforce residency rules.

Social Security & National Insurance

Employees in the US pay 6.2% Social Security and 1.45% Medicare (matched by employers).
Self-employed individuals pay 15.3%.

The US–UK Totalisation Agreement prevents double contributions. NI may continue if you remain UK-employed and hold a Certificate of Coverage.