Why a US company might need a subsidiary (and when it doesn't)

If your US company is hiring outside the country, launching a separate line of business, or signing customers who want to contract with a local entity, someone has probably suggested setting up a subsidiary. A subsidiary solves specific problems well, and it also adds a second set of books, filings, and intercompany rules that last as long as the entity does.

A US company needs a subsidiary when it has to employ people or operate on an ongoing basis in another country, when a regulator or customer requires a local entity, or when it wants to keep the liabilities of one business line separate from the rest. It usually does not need one to sell into other US states, to work with a few foreign contractors, or to test a new market, because cheaper structures cover those cases.

Below is what a subsidiary is, the situations that call for one, the ones that don't, and what it adds to your compliance load.

A subsidiary is a separate company your company owns

A subsidiary is a legal entity controlled by a parent company, usually through majority or full ownership. It has its own registration, its own bank accounts, its own contracts, and in most cases its own tax filings.

Domestic subsidiary. A US entity, often an LLC or a corporation, owned by your US company. It is typically used to separate a business line or asset from the parent.

Foreign subsidiary. An entity formed under another country's law and owned by your US company. It is typically used to employ people or operate in that country.

The separation is the point. A subsidiary's debts and legal claims generally stay with the subsidiary, and it can hold licenses, sign local contracts, and employ local staff in its own name. That protection only holds if the companies are run as separate businesses, with separate accounts, documented intercompany agreements, and no casual mixing of funds.

Hiring employees abroad is the most common reason

A US company that directly employs people in another country, or runs ongoing operations there, can create what tax treaties call a permanent establishment. That exposes the US company itself to that country's corporate tax, payroll obligations, and employment law, often without the company realizing it until an audit or a dispute.

A foreign subsidiary contains that exposure. The subsidiary employs the local team, runs local payroll, and pays tax in that country on the profit attributed to its work. The US parent's exposure is limited to its relationship with the subsidiary.

This is the typical structure for a US company with an engineering or operations team abroad, including companies founded outside the US that later formed a US parent and kept their team in the home country.

Some customers, regulators, and banks require a local entity

Local contracting. Government buyers and some large enterprises in other countries will only sign with a locally registered company.

Licensing. Regulated activities, such as lending, payments, insurance, or healthcare, often require a license held by an entity formed in that jurisdiction.

Banking and invoicing. Opening a local bank account, invoicing in local currency, or collecting local sales taxes can require a local entity.

In each case, the subsidiary exists because a third party requires it, not because of a tax or liability decision.

Separating risk or a business line can justify a domestic subsidiary

A domestic subsidiary is useful when one part of the business carries risk the rest of the company should not share.

Liability isolation. A new product line with meaningful legal exposure, real estate, or a regulated activity can sit in its own entity so that a claim against it does not reach the parent's assets.

A future sale or separate fundraise. A business line that may be sold, spun out, or funded separately is easier to transact on if it already has its own entity, contracts, and books.

Joint ventures. A business co-owned with another company usually sits in its own entity with its own ownership terms.

A single-member LLC owned by your company is disregarded for federal income tax purposes, so it adds no separate federal return while still providing liability separation. A corporate subsidiary that is at least 80% owned can generally be included in a consolidated federal return with the parent.

Many situations don't need a subsidiary at all

Selling in other US states. A US company operating in another state registers there as a foreign entity, a process called foreign qualification. It does not form a subsidiary. Sales tax nexus and state income tax filings follow from where you sell and operate, not from your entity structure.

A few foreign contractors. Engaging independent contractors abroad, under properly drafted contracts, does not usually require a local entity. The risk is misclassification: contractors who work like employees can be treated as employees under local law, which brings back the permanent establishment question.

Testing a new country. An employer of record, a third-party firm that legally employs staff on your behalf in another country, lets you hire a small team without forming an entity. It costs more per person than running your own payroll, and it becomes less economical as the team grows.

Remote marketing or sales visits. Staff traveling to meet customers, attend events, or explore a market generally do not require a local entity, though the rules on contract signing authority vary by country and treaty.

The alternatives compared

A foreign subsidiary adds US filings, not just foreign ones

Owning a foreign subsidiary creates obligations on the US side, in addition to whatever the subsidiary files locally.

Form 5471. A US company that owns or controls a foreign corporation files Form 5471 with its federal tax return each year. The penalty for failing to file starts at $10,000 per form, per year.

Form 8858. If the foreign subsidiary is a disregarded entity for US tax purposes, the parent files Form 8858 instead.

Controlled foreign corporation rules. A foreign subsidiary that is majority owned by US shareholders is a controlled foreign corporation. Certain categories of its income can be taxed to the US parent in the year earned, even if the subsidiary never distributes that income.

Transfer pricing. Transactions between the parent and the subsidiary, such as service fees, cost reimbursements, loans, and IP licenses, must be priced as if the companies were unrelated. Both countries can examine that pricing, and the documentation supporting it should exist before an auditor asks.

Form 926. Transfers of cash or property from the US parent to a foreign corporation can require Form 926.

Foreign bank account reporting. US persons with signature authority over, or a financial interest in, foreign accounts above the reporting threshold file FinCEN Form 114, known as the FBAR.

If your US company is itself 25% or more foreign-owned, it continues to file Form 5472 for transactions with its foreign owners. Adding a subsidiary does not remove that filing.

How Inkle fits in

Inkle's tax experts handle the US side of a subsidiary structure, including the parent company's federal return, Form 5471 and related international information returns, and the US filings for domestic subsidiaries. Inkle covers US obligations only. A foreign subsidiary's local registration, tax, and payroll filings are handled by licensed professionals in that country.

The bottom line

A subsidiary is the right structure when the company needs a permanent presence somewhere, when a third party requires a local entity, or when one part of the business should be walled off from the rest. It is the wrong structure when a contractor agreement, an employer of record, or a foreign qualification would do the same job with less overhead. The deciding question is usually how long and how deep the activity will be. A foreign subsidiary also brings US reporting that runs every year the entity exists, so the cost of the decision is the annual compliance, not just the formation fee.

Frequently asked questions

Do I need a subsidiary to hire employees in another country?

Usually, if the team is permanent or growing. Employing people directly without a local entity can create a permanent establishment and expose your US company to that country's tax and employment rules. An employer of record is the common alternative for a small team or while you test the market.

Do I need a subsidiary to do business in another US state?

No. A US company operating in another state registers there through foreign qualification, and it files that state's taxes based on its activity there. A subsidiary is only needed if you want a separate legal entity for liability or business reasons.

What is the difference between a branch and a subsidiary?

A branch is part of your US company operating in another country, so the US company is directly liable for its obligations and taxed on its local profit there. A subsidiary is a separate company that holds its own liabilities and pays its own local tax. Most countries treat a branch as a permanent establishment of the parent.

What US tax forms does a foreign subsidiary require?

The US parent typically files Form 5471 each year for a foreign corporation it controls, or Form 8858 for a foreign disregarded entity. It may also need Form 926 for transfers to the subsidiary and FBAR filings for foreign bank accounts. Controlled foreign corporation rules can make some of the subsidiary's income taxable to the parent in the year it is earned.

Can a US LLC own a subsidiary?

Yes. An LLC can own subsidiaries, domestic or foreign, just as a corporation can. How the structure is taxed depends on how the parent LLC and each subsidiary are classified for federal tax purposes.

Does forming a subsidiary reduce my US taxes?

Not by itself. Profits earned in a foreign subsidiary are taxed locally, and US controlled foreign corporation rules can pull some of that income back into the US parent's return. Intercompany pricing has to reflect arm's length terms, so shifting profit into the subsidiary without a business reason creates audit risk rather than savings.