US subsidiary vs Delaware flip: the choice for European companies

For European companies, the US subsidiary vs Delaware flip question comes down to who sits at the top of the group after the move. A subsidiary keeps your European company at the top and adds a US company underneath it. A flip puts a new Delaware company at the top and turns your European company into its subsidiary. Established, profitable companies entering the US tend to look at the first. Startups planning to raise from US investors are the ones that face the second.

Greatweek is a commercial growth and US market-entry agency. It is not a law firm or tax advisor, and nothing here is legal or tax advice. The aim is to help you ask the right questions before you brief your advisors.

What a US subsidiary is

A US subsidiary is a new company formed in a US state and owned by your existing European company. Your shareholders, cap table and governance at home stay as they are. The subsidiary signs US contracts, employs US staff, opens a US bank account and collects from US customers.

If the subsidiary is a C corporation, it pays federal income tax at the entity level on Form 1120, and the IRS Form 1120 instructions for 2025 apply a rate of 21% to taxable income. If you consider an LLC instead, be aware that a US LLC wholly owned by a foreign person and treated as a disregarded entity has its own filing duty, a pro forma Form 1120 with Form 5472 attached. Ask your tax advisor how those rules apply to a parent-owned structure.

Forming the subsidiary can be simple. Stripe Atlas offers a C corporation subsidiary of an existing company as a named option, as of October 2026. It asks for the parent's legal name, country and tax ID, and issues the shares to the parent after incorporation. The harder work is around the formation: board approvals at the parent, an intercompany agreement setting out what the subsidiary pays the parent for products, services or IP, and a plan for funding the subsidiary.

Why not register the European company directly

Some companies ask whether they can skip a subsidiary and register the parent to do business in a US state. It is possible, and it changes your obligations.

Beneficial ownership reporting is one example. On August 11, 2026 FinCEN issued a final rule that permanently removes the BOI requirement for US companies. A reporting company is now only an entity formed under the law of a foreign country that has registered to do business in a US state. A US-formed subsidiary is exempt. A European parent registered directly in a state must report, and new registrants have 30 calendar days after registration takes effect, per the FinCEN BOI page. The details are in Greatweek's article on BOI reporting for foreign-owned US companies.

State fees differ too.

What a Delaware flip is

In a flip, a new Delaware corporation becomes the parent of the group. The existing shareholders of the European company typically exchange their shares for shares in the Delaware company, so the European company ends up as a wholly owned subsidiary. The product, team and customers do not move. The ownership structure above them does.

Founders consider a flip mainly because of investors. Stripe's Atlas documentation says C corporations are "Preferred by institutional investors who might be unable to invest in LLCs". Y Combinator's FAQ says companies incorporated outside the US, Canada, Singapore or the Cayman Islands "will need to create a parent company that is in one of those jurisdictions", with the existing company becoming a subsidiary. That FAQ does not name Delaware specifically, but it shows how some US investors think about where the top company sits.

There is also QSBS. Under Section 1202 of the US tax code, as amended in July 2025, the qualified small business stock exclusion applies only to stock in a "domestic corporation which is a C corporation". QSBS is a US tax benefit. Whether it matters to you depends on your own tax residence and that of your investors.

When the subsidiary is the right route

A subsidiary fits when the European company will remain the center of the business: its board, its shareholders and its existing investors stay in place, and the US is a new market rather than a new home. It also fits when you have no plans to raise from US venture investors, or when your existing investors would not accept a change in where they hold shares.

For most established, revenue-generating companies, this is the default question to test first. It keeps the US entity as an operating unit that you can fund, staff and evaluate against commercial milestones.

Greatweek's Board Advisory work brings a commercial operator's perspective to an expansion proposal: what the buyer evidence supports, what the forecast assumes and where execution may break down, with decision questions and investment gates for the board. The structure itself stays with your lawyers and tax advisors.

When a flip is worth considering

A flip is worth a serious look in three situations:

• US institutional investors are likely to lead your next round.
• An accelerator or investor requires a parent in a specific jurisdiction.
• The business is moving its leadership and center of gravity to the US.

Treat a flip as hard to reverse. Whether the share exchange creates tax in your home country, for founders or for existing shareholders, is a question for advisors in both jurisdictions before anything is signed.

Greatweek's article on whether US investors require a Delaware C corp covers what to check before fundraising.

When a law firm, or Clerky, is the better route

Formation platforms suit simple cases. A flip is not a simple case. It involves a share exchange, consents from existing shareholders, and corporate and tax law in at least two countries. Use a law firm for it, ideally one that coordinates with counsel in your home country.

For a new Delaware C corporation with straightforward ownership, Clerky is another option. As of October 2026, Clerky lists pay-per-use incorporation at $427 one-time, covering a Delaware C corporation with expedited filing and first-year registered agent, and a Company Lifetime Package at $819 one-time with ongoing fundraising, hiring and maintenance documents. It forms Delaware C corporations only, not LLCs, lists foreign qualification at $125 plus third-party fees, and offers an EIN application for non-US founders. It suits teams who are comfortable completing standard documents themselves and want them kept in one place.

Frequently asked questions

Do I need a Delaware flip to sell in the US?

No. A US subsidiary owned by your European company can sign contracts, hire and take payments. A flip is mainly about investor and ownership structure, not selling.

Is a US subsidiary exempt from BOI reporting?

Yes, as of FinCEN's August 2026 final rule, US-formed companies are exempt. A foreign company registered directly in a US state must still report.

Can Stripe Atlas form a subsidiary for my company?

As of October 2026, Atlas offers a C corporation subsidiary option that issues shares to an existing parent. It is not a law firm and does not give legal or tax advice.

How long does a Delaware flip take?

There is no standard answer. It depends on your shareholders, your home-country law and your advisors. Ask your law firm for a timeline before you commit to a fundraising date.

The structure question is easier once you know what the US entity is for. Read the benefits of incorporating in the US, and if you want a commercial view before you brief lawyers, book a 20-minute US Entry Review. Confirm any subsidiary or flip decision with a qualified corporate lawyer and US tax advisor, and with counsel in your home country.