A subsidiary operates through a separate U.S. legal entity. A branch conducts business as part of the Japanese company itself. This affects the taxpayer, returns, and taxation of profits.
This comparison assumes a U.S. subsidiary taxed as an ordinary corporation. LLC treatment depends on its tax classification.
1. Taxpayer and Returns
| Item | U.S. subsidiary | U.S. branch of a Japanese company |
|---|---|---|
| Taxpayer | Separate U.S. corporation | Japanese corporation |
| Typical federal return | Form 1120 | Form 1120-F |
| Basic tax scope | Worldwide income | Effectively connected income and certain other income, subject to treaty review |
Keeping separate branch accounts does not create a separate U.S. corporation.
References: IRS — Form 1120 Instructions, IRS — Form 1120-F Instructions
2. Permanent Establishment and Attributable Profits
For treaty-eligible Japanese companies, review whether a U.S. permanent establishment exists and which business profits are attributable to it.
Actual activities matter, not merely the “branch” or “representative office” label. Even when treaty protection appears available, return filing, treaty disclosure, or a protective return may warrant consideration.
Reference: IRS — Form 1120-F Instructions
3. Profit Repatriation
Subsidiary dividends may require withholding, subject to treaty reductions or exemptions.
Branch remittances are not dividends between separate companies, but branch profits tax may apply. Its calculation considers after-tax earnings and changes in U.S. net equity, rather than simply actual transfers.
Treaty eligibility and conditions require review.
References: IRS — Publication 515, IRS — Form 1120-F Instructions
4. Parent and Head-Office Transactions
A subsidiary records transactions with its parent as dealings between separate entities.
A branch requires appropriate attribution of income and expenses, including head-office allocations. Internal accounting entries do not automatically determine U.S. tax treatment.
Form 5472 and other information returns may also require review.
Reference: IRS — Form 5472 Instructions
5. Which Structure Is Preferable?
Consider operations, expected profits, financing, repatriation, Japanese taxation, state taxes, and administrative costs. Legal liability and contractual implications also require legal advice.
We review the structure and activities to explain U.S. filing requirements and our engagement scope.
This answer provides general information. Classification, treaty eligibility, activities, and the tax year affect treatment.
Information reviewed: October 14, 2026
