International tax expertise, delivered through software.
Built by a team with over a decade of international tax advisory experience — for individuals navigating expat obligations and for the companies that employ them.
Our background
Built at the intersection of tax and tech.
We've lived both sides of the cross-border tax problem — as expats filing across jurisdictions, and as operators scaling global teams.
Expats ourselves
Filed across multiple jurisdictions globally. Treaty elections, equity comp, FBAR/FATCA — navigated firsthand.
Scaled global teams
Built tech companies with employees across regions. Seen how fast employer tax obligations compound.
For individuals
US citizens abroad — tax filing, advisory memos, equity exercise planning, and compliance.
For companies
Equity comp compliance, Permanent Establishment risk, employer obligations, and employee tax support on one platform.
Our approach
AI-first. Professionally reviewed.
Agentax is not a chatbot and not a legacy accounting firm. Our platform combines AI-powered tax intelligence — trained on IRS publications, tax treaties, and local tax authority guidance — with licensed professional review at every step.
AI handles preparation, analysis, and citation. Professionals handle judgment, review, and sign-off. The result is faster, more affordable, and more reliable than either approach alone.
Meet the experts
Tim brings over 10 years of international tax expertise spanning Big Four advisory, multinational corporate tax, and high-growth startups. He started his career at Ernst & Young LLP in Amsterdam, where he developed deep expertise in US International Corporate Taxation and earned a certification from the Dutch Association of Tax Advisors (NOB).
After EY, Tim joined a listed Dutch multinational and relocated to San Francisco, where he was responsible for all US tax affairs — giving him firsthand experience with cross-border complexities that American expats navigate every year.
Most recently, Tim joined Gigs, a fast-growing startup, where he has built expertise in stock option taxation across multiple jurisdictions. That experience — combined with his advisory background — is what powers Agentax's approach to equity compensation and expat tax planning.
Kyle is a seasoned startup operator with over a decade of global experience across Americas, EMEA, and APAC. He's spent the past five years in London/Berlin as Head of Business Development at Gigs, leading GTM, strategy and operations, scaling the business from pre-revenue (Y Combinator) to significant commercial traction. As one of the first 5 employees, he's gained significant experience navigating the complexities of start-up / scale-up stock options to stay compliant across borders and maximize financial tax outcomes.
Prior to Gigs, Kyle founded LetsBab, a social e-commerce platform that scaled to 10k+ users. He started his career as a Senior Finance & Strategy Analyst at Apple in Cupertino, California where he led the global GTM launch of the Apple Watch, secured partnerships with international platforms (i.e. Tmall and WeChat), and launched apple.com across new markets. This gave him firsthand exposure to RSUs, ESPPs, Options, and other multi-national FAANG equity programs.
Kyle holds an MBA from the University of Cambridge, Queens' College and BS in Financial Management & Economics from California Polytechnic, SLO.
Our principles
How we build
Accuracy first
Every calculation is built on current IRS revenue procedures, treaty provisions, and local tax authority guidance. We update our engine annually to reflect the latest thresholds, rates, and form changes.
Expat-native design
We don't retrofit domestic tax software for international filers. Every screen, workflow, and computation is purpose-built for Americans earning income abroad.
Transparency
Our advisory memos cite authoritative sources inline. Our filing engine shows you exactly how every number is calculated — no black boxes.
Ready to get started?
File your return, get an advisory memo, or learn how Agentax Workforce can support your team.