Essential tax considerations for your U.S. launch

Executives accustomed to streamlined national tax systems in Europe often seek similar simplicity in the U.S. market. However, a legal entity in Delaware is entirely separate from the state and local tax (SALT) obligations triggered by a company’s sales, marketing, HR activities, office locations, warehousing, assets etc. across the country. 

Crucially, this risk is not confined to the U.S. subsidiary. European HQs, can trigger U.S. tax obligations the moment they begin transacting with U.S. customers from overseas. States do not require a company to be "incorporated" within their borders to demand tax compliance; they only require a "Nexus.", and this nexus often gets triggered without management in Europe realizing it.

"Nexus" refers to a physical or economic tie to a state that creates a tax obligation. Since the 2018 Supreme Court ruling in South Dakota v. Wayfair, physical presence is no longer the sole requirement for a presence for Sales and Use Tax (SUT). Increasingly, states argue that companies that need to register for SUT may also have a nexus for Corporate Income Tax (CIT). 

A common trend among European companies is the use of Professional Employer Organizations (PEOs) or Employers of Record (EOR’s) to manage U.S. hiring. While the EORs may simplify payroll matters, they do not insulate a company from Corporate Income Tax (CIT) and SUT exposure.  

The employee remains an agent of the foreign holding company. Consequently, their activities often create Nexus, exposing the international entity to U.S. corporate and sales tax risks. To mitigate this, established firms should utilize a local U.S. subsidiary to "fence off" these liabilities, ensuring the European parent company remains protected from federal and state-level reach. 

While the IRS, and an increasing number of states, have upped their way of getting overseas companies on their radar to argue tax presence for the European entity, it is still mostly in the due diligence stage when the company is trying to raise funds or do a (US) exit that these tax exposures come to the surface.  

Multi-state tax compliance is not an optional legal hurdle, but an ongoing operational responsibility that evolves as a company scales. Managing these obligations requires tracking every expansion milestone-such as a first remote hire or crossing a specific state revenue threshold-to ensure tax filings remain current. 

For international companies, the goal is to isolate these risks within a dedicated U.S. structure to protect the parent company from state-level tax exposure. By partnering with an integrated back-office specialist, executives can ensure that U.S. tax and governance requirements are managed professionally, allowing the leadership team to focus on commercial growth with a stable, compliant foundation.