Ask a European founder what scares them most about expanding to the US, and "getting taxed twice" is near the top of the list. The fear of earning a dollar in America, paying US tax on it, and then watching your home country tax the same dollar again is enough to make founders stall the whole move.
So here's the line from our StateMinded podcast guest, cross-border tax specialist Carolin Hock, that stopped us mid-conversation:
"Generally speaking, I say don't worry about double taxation."
Not because it isn't real — but because it's one of the most solvable problems in the entire cross-border playbook. The danger founders should actually be losing sleep over is somewhere else entirely. Let's separate the bogeyman from the real trap.
The reason Carolin is so relaxed about double taxation comes down to three mechanisms working in your favor.
Tax treaties. The US has double-taxation treaties with virtually every major European nation. As Carolin noted, "pretty much every country has that double taxation treaty, which is extremely helpful." These agreements exist precisely so the same income isn't fully taxed by two governments.
Effectively connected income. Rather than the US taxing your global activity, the system is designed so that — for a foreign company done right — only your US-source, effectively connected income gets taxed in the US. You pay your fair share on what your American operations actually generate, and no more.
Foreign tax credits. Whatever you've already paid to your home jurisdiction can generally be credited against what you'd otherwise owe — and vice versa. So the same income doesn't get taxed in full, twice.
Is it perfectly clean? No. Carolin was honest that there's "often a little bit of friction overlap" — it's not always a tidy dollar-for-euro swap, and there's a ratio analysis involved. But the structure to navigate it is built into the code. With planning, this is friction, not catastrophe.
There's even good news on the trajectory: the US is steadily moving away from worldwide taxation on the corporate side. (On the individual side it's a different story — the US is one of the only countries on earth that taxes citizens and green-card holders on their worldwide income, which is its own planning conversation.) And for the many founders who eventually become US citizens to make capital-raising easier, then later want to retire back in Europe?
European countries generally tax higher than the US, so it often comes out to zero US tax liability — a pure filing exercise, with treaty tiebreakers handling the back-and-forth.
Here's where Carolin leaned in. The thing founders forget — the thing that genuinely "throws us for a loop" — isn't income at all. It's your personal investments.
If you become a full US tax person, suddenly the ordinary financial life you built in Europe comes under a harsh spotlight. The European ETF you bought years ago. Your private (non-government) pension. A life insurance policy. The "few thousand dollars here and there" that every 30- or 40-something European has accumulated without thinking twice.
The US treats many foreign investment vehicles under "punitive tax schemes," wrapped in informational reporting requirements — and, as with the entity filings, the amount barely matters. It's not the size of the account that creates the danger; it's the failure to report it correctly. A modest European fund can create a reporting headache wildly out of proportion to its value.
This is the part founders never see coming, because they're braced for the income fight and walking blind into the investment one.
A related landmine: founders often hold onto a property back home — a flat they don't want to sell until the US move is proven — and earn rental income from it. That, Carolin said, is no problem at all and easy to navigate. Where the property sits gets first claim to tax it (a German house is taxed in Germany first, always), and the US then sees it on your return but offsets it with a foreign tax credit.
The mistake is overcomplicating it. If you wrap that European property or income inside a foreign corporate entity and you've become a US person with a controlling interest, you've potentially walked into the controlled-foreign-entity rules — yet more informational forms, more civil-penalty exposure, and possible extra tax. Carolin's pragmatic advice: where possible, "just keep it under your own name. It makes things rather simple."
Notice what double taxation, foreign investments, and foreign entities all have in common. The income most founders fear is the part the system is built to handle. The damage comes from the quiet, structural stuff — the reporting, the residency math, the assets you forgot to mention — that nobody flags until it's expensive.
That's why Carolin's repeated refrain matters so much: understand your exposure. Not your tax bill — your exposure. The two are very different, and confusing them is how founders end up afraid of the wrong thing.
At StateMinded, our job is to turn your products into American revenue — and revenue you get to keep. That starts with getting the right cross-border specialist in the room before the first deal, not after the first surprise.
Carolin's "holy trinity" for any founder crossing the Atlantic: a cross-border CPA, an attorney, and a banking partner — people who work at your stage, not just Fortune 500 scale.
Planning your US entry? Book a no-obligation US assessment with StateMinded and let's build the foundation before the money starts moving.
This article shares general concepts from our conversation with Carolin Hock and isn't tax advice. Treaties, credits, and investment rules all hinge on your specific facts — confirm your situation with a qualified cross-border advisor before acting.