Two things decide which governments can tax you: the country you live in, and the passports you hold. Start here.
A US passport matters most of all, because it taxes you worldwide wherever you move.
Add everything you hold. We work out the tax on each one, wherever it comes from, and the smartest way to hold it.
The quiet cost of holding your money. A 1% yearly fee sounds tiny but eats a fortune over a lifetime. Leave the defaults if you are not sure.
Selling a business, an inheritance, a gift, retiring, buying property: these one-off moments are usually the biggest tax decisions of all. Add any that apply, or skip.
If you split your time across countries, the days you spend decide who can claim you as a tax resident. Add them, or skip if you live in one place.
What to do, biggest money first
Everything you own
What you actually hold
What your fees cost
Cheapest place to live
Yearly tax on this portfolio held the smart way, including an assumed slice of capital gains realized each year. Lower is better.
Which country can claim you
Passing it on
Watched all year
Keeps an eye on these and warns you before they bite.
How this works
It takes your country, your holdings and your plans, and applies the published headline tax rates for about 165 countries: the source-country cut, your home country's tax, capital gains, wealth tax, inheritance and the hidden US ones, fees, and the big life events, all checked against current 2025-2026 sources. It is built to show you, fast, where the money and the risks are and what to ask about. It is a sharp screening tool, not advice: confirm with a professional before you move country, sell a large holding, or restructure anything.