US Tax Guide for California Residents Living in the UK

California is one of the most aggressive states when it comes to taxing former residents. If you moved from California to the UK, California may still consider you a tax resident if you maintain significant ties. California does not conform to the federal FEIE.

California Residency Rules

California determines residency based on domicile and physical presence. If you left California but maintained a California driver's license, voter registration, property, bank accounts, or family ties, California may still consider you a resident. California does not conform to the federal FEIE, meaning even if you exclude income from federal tax, California will still tax it.

UK Tax Implications

The UK taxes worldwide income for tax residents. UK tax rates reach up to 45% plus National Insurance. The US-UK tax treaty applies. The remittance basis may apply for non-domiciled residents.

FEIE vs FTC for California Residents in the UK

California does not conform to the federal FEIE. This means:

• You can claim FEIE on your federal return
• California will still tax the same income
• FTC may be available for California if the UK taxes the income

Common Mistakes California Residents Make in the UK

1. Assuming leaving California ends state tax residency — California aggressively pursues former residents.
2. Not updating driver's license and voter registration — Evidence of California residency.
3. Claiming FEIE without understanding California non-conformity — California will still tax the income.
4. Not planning state tax exit before moving — State tax planning should happen before you leave.

State Tax Exit Strategy

To properly exit California tax residency:

• Surrender California driver's license
• Cancel California voter registration
• Sell or rent out California property
• Close California bank accounts
• Document your move with a clear paper trail
• Consider establishing residency in a no-tax state before moving abroad

When to Get Professional Help

You should consider professional help if you have California tax residency questions, foreign accounts exceeding $10,000, or complex income situations.

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FileAbroad explains U.S. federal tax and U.S. international information-reporting consequences of documented foreign facts. It does not provide foreign-country legal or tax representation, valuation opinions, banking or remittance advice, or advice on what a foreign authority will accept.

Scope statement reviewed 2026-08-30 · FileAbroad product/content owner