SS-4 Address Instructions: Foreign Address or Registered Agent?
Choose the right entries for SS-4 lines 4, 5 and 6. Learn how mailing, physical and registered agent addresses differ for a foreign-owned US LLC.
Form SS-4 separates your mailing address from the entity’s physical location. Lines 4a-4b are for correspondence; lines 5a-5b are for a different physical address; line 6 asks for the primary physical location. A registered agent’s address is not automatically the right answer to all three. Foreign mailing and physical addresses are explicitly addressed in the IRS instructions.
For a US LLC run by someone abroad, start with how each address is actually used. The state where you formed the company, the location where someone accepts legal documents, and the place where the business operates can be different.
Lines 4a-4b: where the entity receives correspondence
Enter the mailing address for the entity’s correspondence. The IRS instructions require a foreign mailing address to include the city, province or state, postal code and country name without abbreviating the country.
Before using a mail service or registered agent’s address, confirm that the service accepts IRS correspondence for your company and that you can reliably access it. A service that accepts state legal notices may have a different policy for ordinary mail or tax documents. That is a practical check with the provider, not an IRS rule that every LLC must buy a US mailing address.
If line 3 contains a care-of person, the instructions connect the mailing address to that person. Check the combination rather than reviewing the address in isolation.
Lines 5a-5b: the physical address, when different
Enter the entity’s physical address if it differs from the mailing address on lines 4a-4b. Do not put a PO box here. For an address outside the US or its territories, include the city, province or state, postal code and full country name. IRS instructions for lines 5a-5b.
The rule is not “leave line 5 blank if there is no US office.” The relevant question is whether the physical address differs from the mailing address. A foreign physical location still needs to be considered.
The opposite mistake is to assume the owner’s home is always the business location. If the company actually operates elsewhere, use the entity’s facts. A guide cannot decide where a distributed business is principally located simply from the owner’s nationality.
Line 6: primary physical location
The field label asks for the county and state where the principal business is located. The IRS instruction is to enter the entity’s primary physical location. It does not tell every foreign owner to copy the registered agent’s county or the formation state.
For an entity whose primary location is abroad, do not invent a US county to make the form resemble a domestic example. Establish the actual location and obtain clarification from the IRS or a qualified adviser if you need help expressing an unusual cross-border arrangement. The general instructions do not provide a single universal foreign-address phrase for every case.
A practical address worksheet
Before transferring details to the form, write down the following facts separately:
| Question | What to verify |
|---|---|
| Where was the LLC formed? | Formation record; this answers organization questions |
| Where should tax correspondence arrive? | A usable address and the recipient’s permission |
| Where is the business physically located? | Actual business operations and premises |
| What does the registered agent provide? | Legal notice handling, ordinary mail, or additional services |
| Are the mailing and physical addresses different? | Whether lines 5a-5b need separate entries |
For example, a fictional LLC could be organized in Wyoming, receive permitted correspondence through a US mail provider and operate from a location abroad. Those facts should remain separate during review. They do not establish the correct final entries for another business.
Why an address affects more than mail delivery
The IRS uses location criteria for application channels and fax destinations. A US mail address does not, by itself, prove that the business qualifies for online application or a domestic fax route. Use the published criteria and the entity’s actual situation. See faxing Form SS-4.
After an EIN has been assigned, the SS-4 instructions direct entities to use Form 8822-B for a subsequent mailing-address change. Updating an address is not ordinarily a reason to apply for a new EIN. Keep the existing number and follow the applicable update process.
Common questions
Do I need a US address to complete Form SS-4?
The form’s instructions provide for foreign mailing and physical addresses. That does not mean every application channel has the same eligibility rules; check those separately.
Can I use my registered agent’s address?
First determine whether you are using it for correspondence or claiming it as a physical business location. Confirm the agent’s mail policy for the former and the actual business facts for the latter.
Can I copy the address from my formation certificate?
Use it as evidence of what the formation record says. Confirm whether it answers the particular SS-4 field. One document can contain addresses serving several different legal or operational purposes.
Continue your SS-4 review
Read the complete SS-4 instructions guide before signing. EINPilot’s planned review process keeps source documents and customer-confirmed facts separate. The service is currently a preview; real applications are not open.
General information, not individualized tax advice. Sources checked September 21, 2026: IRS SS-4 instructions, lines 3-6 and filing channels, IRS online EIN eligibility.