A U.S. subsidiary should be treated as a sequencing exercise, not just a formation filing. Before the first invoice or first hire, a foreign group should align legal form, federal and state tax registration, bookkeeping under the Financial Accounting Standards Board framework, related-party documentation, payroll controls, and hiring/immigration procedures. In practice, that means coordinating the Internal Revenue Service, U.S. Securities and Exchange Commission, U.S. Department of Labor, and U.S. Citizenship and Immigration Services, plus the state of incorporation and every state where the subsidiary hires or makes taxable sales.

Checklist

1.  Make sure to select an entity and tax stance as soon as possible, particularly for any foreign owned group, the only options are typically a C-Corporation or an LLC. The type of entity you choose will dictate what type of tax return you will file. You will likely not qualify for S-Corporation status due to the prohibition against non-resident aliens being shareholders
2. Business Structure and Qualification are determined by your jurisdiction of operation. An LLC or Corporation may be formed in Delaware via a quick, streamlined process; however, a foreign entity conducting business in California or New York will be required to file/register as a foreign entity. After forming your LLC or corporation, obtain an EIN from the IRS immediately. If your registered agent is outside of the U.S., you may apply for EIN, via phone, fax, or mail.
3. Establish federal and state tax registrations before beginning operations. A corporation typically submits Form 1120, although foreign-owned corporations and foreign-owned disregarded limited liability companies may have to complete Form 5472, which is used to report transactions between companies owned by foreign people or entities. In addition, when you establish or register to conduct business as a foreign-owned disregarded limited liability Company, you need to complete a pro forma Form 1120 with Form 5472 attached. You need to also set up accounts for state income/franchise taxes, sales/use taxes, withholding taxes and unemployment taxes in all states where you will operate before you receive either revenue or payroll from your operations.
4. Day one could include building accounting under U.S. GAAP. The authoritative source for all nongovernmental U.S. GAAP is the FASB Codification. SEC-style periodic reporting does not happen automatically for a private subsidiary; there can be significant reporting requirements later if the entity becomes an SEC registrant or if the entity enters a securities offering. Separate your chart of accounts to track intercompany loans, service fees, royalties, equity, and tax balances.
5. Before charging begins, the intercompany model should be documented. The arm’s length standard is the basis for Section 482 and documentation of transfer pricing by the IRS exists at the time the return is filed. If it is requested, it is to be provided within 30 days. Written agreements providing evidence of the transaction in question will make Form 5472 reporting and audit by the IRS more defendable.
6.  Before hiring anyone, employers must set up payroll, hiring, benefit, and immigration systems. Employers are required to complete and keep a Form I-9 for every employee hired, and the federal Fair Labor Standards Act requires non-exempt employees to receive overtime after they complete 40 hours of work during a week. If the company has health or retirement plans, ERISA applies to the plan and the employer, and the ACA may apply to large employers and will need to comply with COBRA; therefore, before hiring employees, it’s important to verify what type of visa would be required for foreign employees, generally L-1A, E-2, and H-1B, subject to limitations, will apply for foreign national employees.

Key filings matrix

State variations and compliance calendar

For Delaware, corporations file the annual report and franchise tax by March 1, while LLCs pay the annual tax by June 1; Delaware has no state sales tax, but it does impose business-license and gross-receipts taxes.

For California, foreign entities must register if doing business there; corporations generally face the $800 minimum franchise tax, Statement of Information filings must stay within the statutory filing window, and seller’s permit and payroll-tax registration are separate filings.

For New York, foreign entities file for authority, corporations and LLCs file a biennial statement every two years in the formation/authority month, LLCs face a publication requirement within 120 days, and taxable sellers need a Certificate of Authority. All other states: no specific constraint; still confirm local qualification, payroll, and sales/use tax rules before operating.

Federal corporate returns are generally due by the 15th day of the fourth month after year-end; Form 941 is quarterly; Form 940 and W-2/W-3 are annual.

FAQ

Can a foreign parent use an S-corporation?
Usually no. An S-corporation may not have non-resident-alien shareholders.

Does a private subsidiary file with the SEC?
Not automatically. SEC periodic reports such as Forms 10-K and 10-Q apply once the company becomes subject to SEC reporting.

Is BOI reporting still required for a newly formed U.S. subsidiary?
Current Treasury rules exempt U.S.-created entities from BOI reporting; foreign entities registered to do business in a U.S. state may still have BOI obligations under the revised rule from Financial Crimes Enforcement Network.

When should transfer-pricing documentation be ready?
Ideally no later than return filing: the IRS says the documentation generally should exist when the return is filed and must be produced within 30 days if requested.

If we incorporate in Delaware but hire in California or New York, is Delaware enough?
No. Delaware governs the entity’s formation, but the operating state can still require foreign qualification, payroll registrations, and state tax filings.

Why ERB fits

ERB is well suited to this topic because U.S. subsidiary setup is a control-design problem, not just a filing problem: tax, bookkeeping, payroll, intercompany accounting, and reporting must all work together from day one. For foreign-owned groups, that integrated cross-border view is where a finance adviser adds the most value.