GTaxCalc — International Income Tax Intelligence

How it works

Nine screens. Every number, every strategy.

From your gross salary to an AI-generated CPA briefing — here's what happens each step through the app.

01 / Gross Salary & Pre-Tax Contributions

See your real numbers the moment you open the app

Enter your gross income and instantly see how close you are to the statutory pre-tax contribution cap — no guesswork, no outdated rules.

→Pre-Tax Contributions — live statutory caps built in across all 78 supported countries (401(k) in the US, Workplace Pension in the UK, Riester-Rente in Germany, PER in France, RRSP in Canada, iDeCo in Japan, and more).
→Instant warning — the moment you hit the legal maximum of pre-tax contributions.
→Tax-sheltered capacity — tracked in real time.

Gross salary and pre-tax contributions screen

02 / Residency & Take-Home Pay

Dial in your exact situation

Toggle residency status, state, and filing status — and watch your true take-home pay update instantly.

→Resident vs. Expat toggle with contextual rules for each.
→Regional selector — all 50 US states, Canadian provinces, UK countries, European countries, and more.
→Annual, monthly, and marginal-rate breakdown in one view.

Residency status and take-home pay screen

03 / Tax & Contribution Allocation

Where every dollar actually goes

An interactive donut chart shows exactly how your paycheck splits — plus what your pre-tax contribution is really saving you.

→Live visual model of your paycheck, updated as you adjust inputs.
→Pre-tax contribution advantage calculated automatically.
→Statutory citations included (e.g. IRS §402(g) in the US, HMRC pension rules in the UK).

Tax and contribution allocation donut chart

04 / Tax Bracket Breakdown

Full transparency, bracket by bracket

See precisely how much of your income falls into each tax bracket, plus a line-by-line itemization of every tax and contribution you owe.

→Progressive bracket-by-bracket breakdown.
→Itemized national, regional, and social contribution lines (e.g. Social Security in the US, National Insurance in the UK).
→Effective rate shown next to every line item.

05 / Expat Regime Simulator & CPA Dossier

Find the regime that saves you the most

Compare your standard tax bill against special expat regimes side by side, then export a CPA-ready dossier in one tap.

→1-tap simulation of Beckham Law, NHR 2.0, territorial 0%, and more.
→See your exact savings before switching regimes.
→Export a structured CPA dossier PDF & CSV for your accountant.

Expat regime simulator and CPA dossier export

06 / Global Comparison Ranking

See which country keeps you the most

Rank all 78 supported jurisdictions by take-home pay, filtered by tax structure — from zero-tax havens to territorial and flat-rate systems.

→Ranked leaderboard across all 78 countries.
→Filter by zero-tax, territorial, flat-rate, or progressive systems.
→Relocation Simulator — Create Origin vs Target comparison.
→1-tap Dossier Export, part of a Candidate Offer or for your records.

07 / GPilot™ — AI Cross-Border Tax Strategist

Ask anything. Get a real strategist's answer.

GPilot is your always-on cross-border tax copilot — built to handle the complex, multi-jurisdiction scenarios no calculator alone can solve.

→Multi-turn conversations on real scenarios — dual residency, expat regime selection, treaty relief.
→Understands your full picture — origin, host, and entity profile together.
→Pre-built strategy prompts for common expat situations.

GPilot AI cross-border tax strategist chat

08 / GBrief™ — Executive CPA Briefing

Walk into your CPA meeting already prepared

Generate an executive tax strategy memo — treaty considerations, risk flags, and discussion points — in seconds.

→Full statutory reconciliation of your numbers.
→Bilateral treaty and relief clause guidance.
→Saves you hours of prep — walk in ready, faster.

09 / Tax Library — Laws & Forms

Every law. Every form. Always current.

A searchable library of statutory tax summaries and official revenue forms for all 78 countries, synced live from official sources.

→Full-text search across laws, deductions, and form codes.
→Direct links to official forms — IRS, HMRC, CRA, and more.
→Live sync seal confirms it's never out of date.

Tax library law summaries and form registry

Private by design

100% on your device

No sign-ups, no accounts. Your salary inputs and saved comparisons stay on your device — never sent to a server or sold.

Always current

Built for new budgets

Tax laws, rates, and brackets update as soon as governments announce new budgets — so the numbers never go stale.

Official forms, one tap away

Tax Library & document registry

Direct links to official tax authorities — the IRS, HMRC, CRA, ATO, and others — without hunting through confusing portals.

Curated, not crowded

Only the best-vetted partners

GTaxCalc's Partner Hub doesn't list every provider — only hand-picked CPAs, relocation specialists, and financial services proven to deliver real value, so you don't have to trawl reviews yourself.

Free vs Pro

Start free. Upgrade for the full toolkit.

GTax is free, forever, across all 78 countries. GTax Pro adds the Expat Regime and Cross-Border Relocation Simulators, the CPA-Ready Tax Dossier, and the full GTax AI suite.

Tier 1

GTax

Free

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Pre-tax deduction & pension modeling
Tax bracket & itemized breakdown
Global Comparison Ranking
Official tax forms & agency directory
Partner Hub access

Tier 2

GTax Pro

Pro upgrade

Expat Regimes & Deductions
Cross-Border Relocation Simulator
CPA-Ready Tax Dossier export
Full GTax AI™ suite — GPilot, GBrief
Ad-free experience

GTaxCalc — The Sovereign Tax Engine for International Professionals.

Built for anyone whose paycheck crosses a border.

Expats & Digital Nomads

Recruiters & HR Teams

Remote Workers & Freelancers

Everyday Professionals

Nine screens. Every number, every strategy.