How to File Form 5472 and 1120: Complete Tax Guide for Foreign-Owned US LLCs

The moment a non-resident single-member LLC has a capital contribution or distribution go through, that's usually enough to trigger a Form 5472 filing with a Pro Forma 1120 attached — and this has nothing to do with whether the company actually made any money.

A lot of Chinese cross-border sellers who set up a US LLC end up stuck on the exact same question: do I actually need to file anything, and what's the relationship between Form 5472 and Form 1120 anyway? The most common structure — a US single-member LLC, 100% owned by a non-US individual, that hasn't elected to be taxed as a C Corporation — falls under what the IRS calls a Foreign-Owned U.S. Disregarded Entity. If an LLC like this has reportable related-party transactions during the year, it generally needs to file Form 5472 along with a Pro Forma Form 1120. That doesn't mean the LLC has somehow morphed into a C Corp, and it doesn't mean it owes federal corporate income tax the way a normal C Corporation would. The IRS has a dedicated information-reporting framework specifically for entities in this category.

Which LLCs actually need to file Form 5472

Form 5472 exists to report reportable transactions with related parties for US corporations that are 25% foreign-owned, or foreign corporations doing business in the US. Foreign-owned US disregarded entities — domestic entities wholly owned by a foreign person, treated as disregarded for tax purposes — fall squarely into this category. The textbook case: a Chinese resident owns 100% of a Delaware or Wyoming LLC, and by default that LLC is treated as a disregarded single-member entity.

Registering a US LLC doesn't automatically generate a Form 5472 filing obligation — if no reportable transaction happened during the year, some entities genuinely don't need to file. But flip that around: "no profit" does not mean "no filing required." The test is whether a reportable transaction occurred, not whether the business turned a profit.

Two forms, two very different jobs — don't blur them together

For a foreign-owned single-member LLC, don't read "I have to fill out a 1120" as "my LLC now owes US corporate income tax." A Foreign-Owned U.S. DE has no ordinary income tax filing obligation of its own — it just needs to submit a pro forma version of the 1120 with Form 5472 attached to it.

Here's what a typical setup looks like in practice: a Wyoming LLC, sole member is a Chinese resident, 100% ownership, no C Corporation election, no US employees, running payments through a US bank account. The owner puts capital into the LLC, and the LLC sends some money back to him at some point. That structure lines up almost exactly with what the IRS describes as a foreign-owned U.S. DE — and both the capital injection and the money sent back can fall within Form 5472's reporting scope. The IRS is explicit that Part V covers entity formation, dissolution, acquisition, disposition, and shareholder contributions and distributions. Don't assume "the LLC didn't make a profit" gets you out of this.

The parts of the form actually worth focusing on

Form 5472 runs long, but for a typical foreign-owned single-member LLC, the sections that matter most are Part I, Part II, Part III, and Part V.

Part I covers the LLC's own basic details — name, US address, EIN, total assets, principal business activity code, and whether it qualifies as a Foreign-Owned U.S. DE, which needs to be checked off explicitly. Part II covers the foreign owner's information — name, address, ownership percentage, foreign tax ID if applicable. If the foreign owner doesn't have an SSN or ITIN, don't just make up a number to fill the field. Foreign-Owned U.S. DEs have specific rules for this field — if there's no number, "None" or "N/A" is the correct entry, but every other required piece of information still needs to be provided accurately. Part III covers related-party information, and this is where beginners commonly slip up — even if a related party has already been listed in Part II as the 25% foreign shareholder, if a reportable transaction happened with that same party during the year, Part III still needs its own separate entry.

Part V is the part that a foreign-owned single-member LLC really needs to take seriously. It covers transactions not already captured in Part IV — capital contributions at formation, dissolution-related transactions, acquisitions or dispositions, and shareholder contributions and distributions. For a lot of Chinese-owned US LLCs, the real issue isn't "did the company turn a profit" — it's "did the owner ever send money to the LLC." Say the owner wired $20,000 into the LLC's US bank account in 2025 as working capital — whether that counts as a reportable transaction depends on the nature of the transaction and the related-party relationship. You can't just assume "it's my own money, so it doesn't need reporting."

How to handle the dollar amounts — don't just eyeball a number

Form 5472 is filed in US dollars as a rule. If the original transaction records are in RMB, you need to retain the original amount, transaction date, exchange rate used, converted USD amount, bank records, and a description of each transaction. The IRS does allow reasonable estimates in situations where the exact amount genuinely can't be determined, generally expected to fall within 75% to 125% of the actual reportable amount — but for a business with complete bank records, estimation shouldn't become the default approach.

How Form 1120 actually gets filled out — this is where most people go wrong

If the entity qualifies as a Foreign-Owned U.S. Disregarded Entity, the IRS wants a Pro Forma Form 1120 — not a full 1120 filled out as if the LLC were an ordinary C Corporation. For this type of entity, the 1120 only needs the LLC's name and address, Item B and Item E on the front page, plus "Foreign-Owned U.S. DE" written at the top of the form. Don't copy some generic C-Corp 1120 template off the internet and fill it out page by page through Schedule L and Schedule M-1.

The basic package looks like this: write "Foreign-Owned U.S. DE" at the top of the Pro Forma 1120, attach Form 5472 to it, and submit the two together to the IRS. Here's a key detail: Foreign-Owned U.S. DEs cannot e-file this package. It has to go by fax or mail, using the IRS's designated method. The fax number is 855-887-7737, and faxed documents need to be at least 300 DPI. The mailing address is Internal Revenue Service, 1973 Rulon White Blvd, M/S 6112 Attn: PIN Unit, Ogden, UT 84201 — and the IRS specifically warns against using the standard 1120 mailing address instead.

If there are multiple related parties, each one generally needs its own separate Form 5472 — don't lump every transaction into a single form.

Deadlines and what happens if you miss them

For a calendar-year Foreign-Owned U.S. DE, Form 5472 is typically due April 15 of the following year. If you need more time, file Form 7004 before the original due date, which pushes the deadline out to October 15 automatically — using the same designated submission method and address for Foreign-Owned U.S. DEs. That extension only moves the filing deadline; it doesn't extend your recordkeeping obligation, which starts from day one regardless.

The starting penalty for a late or missing filing is $25,000. If the IRS sends a notice and the issue still isn't fixed 90 days later, additional penalties stack on every 30 days (or part of a 30-day period) after that. Submitting a blank or substantively incomplete Form 5472 doesn't count as compliance — the IRS can treat that as no filing at all. And here's the part that really matters: there's no statute of limitations on this penalty. If an LLC has never filed since it was formed — say it was set up in 2019, never filed anything, and this only comes to light in 2026 — that means catching up on seven years of Pro Forma 1120s and Form 5472s at once, from 2019 through 2025, with each year and each related party potentially triggering its own separate $25,000-plus penalty. That adds up fast. The earlier this gets caught, the smaller the exposure — the longer it sits, the worse it gets.

Form 5472 isn't corporate income tax — this distinction matters

Form 5472 is fundamentally an information return, used to report qualifying related-party transactions to the IRS. Form 1120, for an actual C Corporation, is the return that calculates gross income, deductions, taxable income, and corporate tax owed. So it's entirely consistent to be required to file Form 5472 while the LLC itself isn't taxed as a C Corp at all — Form 5472 isn't corporate income tax, and filing a Pro Forma 1120 doesn't mean the LLC has somehow elected C Corporation tax treatment.

A real change coming out of 2025 legislation, worth knowing about

The One Big Beautiful Bill Act, signed in July 2025, includes two provisions taking effect in 2026 that connect directly to this filing structure: a new 1% excise tax on certain cross-border fund transfers, and a requirement that all foreign owners provide a foreign taxpayer identification number. These aren't clickbait-style "new 2026 rules" — they're genuine legislative changes. Anyone selling through a foreign-owned US entity should pay attention here, and it's worth confirming the specific scope and implementation details with a CPA or EA who specializes in US international tax.

The mistakes Chinese sellers make most often

Treating the LLC like an ordinary C Corporation and downloading a generic 1120 template off the internet without first confirming their actual federal tax classification. Assuming no sales means no filing obligation — missing the fact that zero revenue doesn't mean zero reportable transactions. Overlooking shareholder capital contributions — the owner wiring money into the LLC's US bank account is one of the most common transaction types that actually needs to be evaluated. Treating a Registered Agent address as the actual place of business — tax filings, banks, and payment platforms can define "address" in completely different ways. Making up a foreign tax ID number when there's no SSN, ITIN, or FTIN available. Filing Form 5472 without the Pro Forma 1120 attached, or vice versa. And discovering only after the deadline has passed that no filing was ever made.

A simple self-check worth running through: Is your US LLC single-member? Is the sole member a non-US resident? Is the LLC still being treated as a disregarded entity by default, without a C Corporation election? Did any capital contribution, distribution, related-party loan, service fee, payment for goods, or expense reimbursement happen during the year? If it qualifies as a Foreign-Owned U.S. DE and a reportable transaction genuinely occurred, the combination you're generally looking at is Form 5472 plus Pro Forma Form 1120 — not a full 1120 filled out as an ordinary C Corporation. For anything involving a more complex structure — multiple related parties, multi-entity setups, cross-border loans — it's worth confirming specifics with a CPA, EA, or tax attorney who specializes in US international tax. This piece lays out the framework for thinking about it; it's not a substitute for professional judgment on your specific situation.