U.S. Tax Questions for American Business Owners in Portugal
Starting a business in Portugal as an American is fairly easy on the Portuguese side. Setting up a company takes days, not months. The tax authority is digital and easy to work with. Portugal has spent years actively welcoming foreign founders and remote entrepreneurs.
The U.S. side of that same decision is a different story, and it doesn't depend on how the business is actually run.
THE CONTROLLED FOREIGN CORPORATION
If an American owns 10% or more of a Portuguese company, the IRS generally treats that company as a Controlled Foreign Corporation, or CFC. It doesn't matter how small the company is. This status comes with its own yearly filing requirement to the IRS, and it can mean the company's profits are taxed to the owner personally, even if that money never leaves the business.
HIGH TAX EXCEPTION
For years, American owners of profitable foreign companies could often avoid paying current U.S. tax on those profits, as long as the company was already being taxed at a high enough rate in its home country. That break still exists, but the rules behind it changed in 2026, when a new U.S. tax law replaced the old system with a new one and shifted the rate needed to qualify.
Here's why that matters in Portugal specifically: Portugal's own corporate tax rate is dropping every year, from 21% down to 19% in 2026, 18% in 2027, and 17% in 2028. Smaller companies pay an even lower rate on their first €50,000 of profit. As Portugal's rate keeps falling, it gets closer to the rate the U.S. requires to qualify for that tax break. For some companies, especially smaller ones using the lower rate, the break may not apply anymore. A separate piece on the site goes into more detail on this.
IFICI
Many Americans set up companies in Portugal partly to qualify for IFICI, the tax incentive that replaced NHR, which can lower personal Portuguese tax for up to ten years. That's a reasonable strategy, but it's worth understanding what IFICI actually does and doesn't cover.
IFICI only affects the tax on money received personally, like a salary from one's own company. It has nothing to do with how the company's profits are taxed by the U.S. Lowering a personal tax bill through IFICI doesn't change anything about the CFC rules above.
There's one more wrinkle. If IFICI lowers the Portuguese tax on a salary, it also lowers the credit that can be claimed against U.S. tax on that same income, since that credit is based on the tax actually paid abroad. This isn't a reason to skip IFICI. It just means the personal tax plan and the company's tax plan need to be looked at together.
OTHER THINGS TO NOTE
Some other issues come up often for American business owners here:
How the business is structured (owning it directly versus through a Portuguese company, for example) affects paperwork, the tax bill in both countries, and how easy it is to sell the business later.
Paying oneself or hiring people doesn't work the same way across both countries. Salary, equity, and other pay arrangements that are normal in the U.S. can create surprises once a Portuguese company is involved.
The paperwork adds up. Between the CFC filing, FBAR, and FATCA, there are several separate reporting requirements, each with its own deadline.
FINAL POINTS
These are things worth sorting out early, when the business is being set up, rather than a few years in after returns have already been filed.
The American Entrepreneurship in Portugal masterclass covers all of this in more depth: how to structure a business, what CFC status means, how IFICI fits in, and how to handle pay across both countries.
This article is for general informational purposes only and does not constitute legal or tax advice. Every situation is different; readers should consult a qualified advisor before making decisions based on the information above.