Tax filing & advice for life across borders.
AI-powered tax service for people living, moving, and holding equity abroad — US expat returns (FEIE, FTC, FBAR), UK Self Assessment, and advisory memos across the US, UK, and Europe. Reviewed by experienced tax advisors, at 5–10× the speed and cost of a traditional firm.
Worked example
US citizen · UK residentOne move, two tax systems. An American in London under the UK FIG regime
New UK arrivals can claim 4 years of relief on foreign income & gains — but the IRS still taxes worldwide income. Every item below is treated differently by each side. We file both, consistently.
- UK salary£95,000Taxed · PAYEForm 1116 credit → $0 US
- RSU vest · US employer$62,400FIG relief → £0 UKOrdinary income
- US dividends & fund gains$28,600FIG relief → £0 UKTaxed at 15%
UK tax saved via FIG claim · 2025/26
$38,700
$91K of foreign income & gains relieved at UK marginal rates
What we file
Form 1040 + 1116
SA100 + FIG claim
One advisor · consistent positions on both sides
Trusted by expats across borders.
“The advisory memo was incredibly thorough — it covered both the Dutch side and IRS obligations and saved me over $3,000 compared to the firm I used the year before.”
Wessel S.
Engineer at Google · Amsterdam
“I needed to understand the implications of early exercising my stock options as an American in Amsterdam. Agentax helped me unlock >20% in tax savings I didn't know I was leaving on the table.”
David K.
Solutions Engineer at Stripe · Amsterdam
“As an American Founder & CEO living in the EU with income across continents, Agentax made filing taxes from abroad incredibly easy. I was behind a few years as well and they cleared it up without any issues. Highly recommended!”
Brian K.
Founder & CEO · Oslo
Cross-border tax,
filed and advised.
Foreign income and equity, sorted.
Full-service US return preparation for Americans abroad — foreign income, equity events, and everything the IRS needs. RSUs, NSOs, ISOs, early exercise, secondary sale, and liquidity.
- US 1040 filing + foreign income reporting (FEIE, FTC, FBAR)
- RSU, NSO, and ISO planning across jurisdictions
- Prepared and reviewed by an experienced tax advisor before filing
Self Assessment handled alongside.
UK Self Assessment prepared in coordination with your US return — employment, self-employment, and investment income reported consistently to HMRC and the IRS.
- SA100 Self Assessment prepared alongside your US return
- Foreign income pages (SA106) and US/UK treaty coordination
- One advisor across both filings — consistent positions, no double tax
Equity & relocation advice, sorted.
Jurisdiction-specific advisory memos with cited authority — for the decisions that move real money. Early exercise, secondary sale, exit, and relocation, each reviewed by an experienced tax advisor.
- Advisory memos for equity events — early exercise, secondary sale, exit
- Relocation & residency planning across the US, UK, and Europe
- Treaty positions and foreign-income optimization (FEIE, FTC)
AI-powered. Professionally reviewed.
Advisory Memos
Jurisdiction-specific memos with cited authority — equity events, relocations, and treaty positions. Reviewed by experienced tax advisors.
Tax Filings
Cross-border preparation and filing — US individual returns and UK Self Assessment, with treaty-optimized positions across 30+ jurisdictions. Reviewed before submission.
Compliance Filing
Foreign-account disclosures (FBAR / FATCA) and treaty positions, with deadlines tracked across the IRS, HMRC, and local tax authorities.
Ready to get started?
File your US or UK return, or get advice on an equity event or a move abroad — start with a conversation.