Can I use my registered agent's address on Form 1120?

No, not as the principal business address. The Form 1120 instructions explicitly say not to use the registered agent address for the state of incorporation. You can use it as a C/O mailing address if the agent agrees to forward IRS mail.

Do the addresses on Form 1120 and Form 5472 need to match?

There is no formal IRS rule requiring an exact match, but consistency is strongly recommended. The entity address in Form 5472 Part I should match the 1120 header. Part II (foreign owner address) is separate and can be your overseas address.

Is the C/O address format in the IRS instructions?

Yes. The Form 1120 instructions explicitly describe and authorize C/O formatting for corporations that receive mail through a third party such as an accountant or attorney.

Form 5472 & Foreign-Owned LLCs

Form 5472 Address: Registered Agent vs C/O Address Rules for Foreign-Owned LLCs

9 min readQ&A Guide

Key Takeaways

Do NOT use your registered agent address as the business address — the IRS Form 1120 instructions explicitly prohibit this
Use C/O (care of) formatting to route mail through a reliable third party — this is explicitly authorized
Keep addresses consistent between Form 1120 and Form 5472 Part I
Form 5472 Part II is for the foreign owner's personal address — a foreign address here is expected
Use Form 8822-B to update your address, and Form 2848/8821 to authorize representatives

Do not use your registered agent address as your business address

The Form 1120 instructions under "Name and Address" explicitly tell filers not to use the address of the registered agent for the state of incorporation. They give the example of a corporation incorporated in Delaware or Nevada whose actual principal office is in a different state.

Your registered agent address is where state filings are received — it is not your LLC's principal place of business.

The IRS-approved solution: use C/O (care of) formatting

The Form 1120 instructions explicitly provide a mechanism for routing mail through a third party. If the corporation receives its mail in care of a third party, the filer should write "C/O" on the street address line followed by the third party's name and their street address or P.O. box.

The instructions give examples like routing mail through an accountant or attorney. This format is officially sanctioned by the IRS.

How to structure the address correctly

Use your real principal office or place of business as the factual anchor for the entity, and use C/O formatting to route IRS mail through a reliable U.S. third party. On the Form 1120 address block, enter your LLC's legal name on line 1, then C/O [Third Party Name] with their street address on the street address line.

The third party can be your registered agent (if they agree to forward IRS mail), a tax professional, accountant, or dedicated mail-handling provider.

Should Form 1120 and Form 5472 Part I addresses match?

The IRS instructions do not state a formal rule that these addresses must be identical. However, since Form 5472 is filed attached to the pro forma Form 1120, keeping entity-identifying information consistent across both forms is strongly recommended.

Form 5472 Part II is different — that is where you enter the foreign owner's personal address. Having a foreign address in Part II and a U.S. C/O address in Part I is perfectly normal for this filing type.

Why reliable mail delivery matters for penalty avoidance

The initial penalty for failure to file Form 5472 is $25,000. But penalties can escalate if you fail to respond to IRS notices within specific timeframes. If the IRS sends a notice that starts a 90-day response clock and your mail delivery is unreliable, a $25,000 problem can become $50,000 or more.

The C/O mechanism exists so filers with unreliable mail can route correspondence through someone who will actually receive and act on it.

form 5472foreign-owned LLCIRS reportingpro forma 1120$25000 penalty