04 · U.S. Company Tax Filing
U.S. Company Tax Filing
Federal filings for a U.S. company depend on its tax classification, its owners’ status and its transactions. We first confirm whether the company is a foreign-owned single-member LLC, a multi-member LLC or a C corporation, then prepare Form 5472 with a pro forma Form 1120, Form 1120 or Form 1065, and flag information returns such as 1099 and 1042-S and state annual report dates. This summarises official rules; individual cases follow a U.S. tax professional’s advice.
The right forms for the tax classification: 5472, 1120, 1065 and information returns.
- Timeline
- Form 5472 with pro forma Form 1120 and Form 1120 (calendar year) are usually due 15 April; Form 1065 usually 15 March; a timely Form 7004 gives six more months. Weekends, holidays or special relief can move the actual date.
- Key deliverables
- Copies of the signed returns, Proof of fax or mail filing, among other documents
When you need it.
- 01A foreign-owned single-member LLC filing Form 5472 for the first time
- 02A C corporation’s annual Form 1120
- 03A multi-member LLC filing Form 1065 and K-1s as a partnership
- 04Missed Forms 5472 from past years, to be assessed
What we do.
01
Form 5472 with pro forma Form 1120
For disregarded entities wholly owned by a foreign person with reportable related-party transactions (including contributions and distributions); cannot be e-filed and goes to the IRS fax or mail channel.
02
Form 1120
A C corporation’s annual federal return, taxed at 21% of taxable income; with 25% or more foreign ownership and reportable transactions, Form 5472 is attached.
03
Form 1065 and K-1s
Multi-member LLCs file as partnerships by default and issue a K-1 to each partner; Forms 8804 / 8805 are assessed for foreign partners.
04
Extensions
A timely Form 7004 extends Forms 5472 / 1120 to 15 October (calendar year).
05
Information returns
Form 1099 or Forms 1042 / 1042-S depending on the payee; the common 2026 threshold for nonemployee compensation on Form 1099 is USD 2,000.
06
State calendar
Flag the annual report and tax dates for Delaware, Wyoming and other states.
Five stages. Clear progress.
Timeline: Form 5472 with pro forma Form 1120 and Form 1120 (calendar year) are usually due 15 April; Form 1065 usually 15 March; a timely Form 7004 gives six more months. Weekends, holidays or special relief can move the actual date.
- 01
Confirm classification
Check entity type, tax classification, owners and EIN.
- 02
Review transactions
Go through the year’s bank statements to identify contributions, distributions and related-party transactions.
- 03
Prepare returns
Prepare the forms and schedules for your review and signature.
- 04
File
Fax or mail through the IRS-designated channel and keep proof.
- 05
Archive and remind
Archive the records and set next year’s and the state reminders.
04 · Required documents
What you need to provide
- Formation documents and EIN letter
- Full-year bank statements
- Records of contributions, distributions and related-party transactions
- Owner identity and address details
05 · Deliverables
What you will receive
- Copies of the signed returns
- Proof of fax or mail filing
- Next year’s filing calendar
Common jurisdictions for this service.
07 · FAQs
Questions about U.S. Company Tax Filing
Yes, if it has reportable related-party transactions, including owner contributions, distributions to the owner and payments on formation or dissolution; no business income does not mean no filing. One Form 5472 is filed per related party with reportable transactions, attached to a pro forma Form 1120.
The initial penalty is generally USD 25,000 per related party per tax year, plus USD 25,000 for each further 30 days if not corrected more than 90 days after IRS notice. If past years were missed, assess a catch-up plan first.
U.S.-source dividends paid to foreign shareholders usually carry 30% statutory withholding; qualifying residents of mainland China can claim 10% under the U.S.–China treaty, subject to residence, beneficial-owner and documentation conditions. The treaty does not apply to Hong Kong.
The BOI exemption is not an FBAR exemption. A U.S. LLC with reportable foreign accounts whose combined balance exceeds USD 10,000 at any time in the year may need to file an FBAR.
This page summarises publicly available regulations for general reference only and does not constitute legal or tax advice. Rules in each jurisdiction may change at any time; please confirm the latest position with an Offshore Isle advisor.
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