Changing a business name with the IRS: what the entity unpostable unit checks

How the mismatch is caught

An entity unpostable exists when "the entity on the account and the entity on the payment/return do not match" (IRM 3.13.222.1.1, Jan. 1, 2018). The match is more forgiving than most payers assume. A transaction unposts as UPC 303 RC 1 only when it "failed to match on three out of four positions (using the Proximal Method)" of the name control, the old name control, the first four non-blank positions of the sort name line, or "the four left-most significant characters of the first three words of the entity Primary Name Line" (IRM 3.13.222.45(1), Jan. 1, 2023). Entity-change documents must match all four positions, and revenue receipts "will be re-sequenced for two cycles prior to unposting as UPC 303" (IRM 3.13.222.47, Jan. 2, 2019).

When the name agrees with the Master File but the name control was keyed wrong, resolution code A "updates the unpostable name control to the Master File name control" (IRM 3.13.222.29(6), Jan. 1, 2022): no letter, no change to your account. Only a real name change reaches you.

How the unit decides what your name is

"Even when the name control and the TIN match an account on the MF, it does not mean the names are the same." The rules for the primary name line, all from IRM 3.13.222.39(5)-(8) (July 29, 2025):

• The Secretary of State decides. The correct name "may be found on the appropriate Secretary of State website"; failing that, the unit contacts the taxpayer.
• Minor differences are ignored. "it is not necessary to address minor name differences (for example, INC versus INCORPORATED or Co. versus Company) unless the name control is affected."
• LLC is appended. With an LLC indicator on the account, "Follow the primary name line with 'LLC'."
• Never from an extension. "name changes should not be made unless verified through the Secretary of State website or contact with an authorized individual."
• The DBA rule. "Do not add the sort name line (dba), if it is exactly the same as the primary name line. Even if the sort name line is similar to the primary name line, input the sort name (dba)."

TC 013, TC 011 or a new EIN

When "The BMF has a different name on the entity," the examiner is told to "Input a TC 013 as necessary," and "If a TC 011 is needed route to Entity Control Team" (IRM 3.13.222.45(4), Jan. 1, 2023). TC 013 changes the name on the existing account; TC 011 merges two accounts and "always posts last to the entity portion of the MF; it will re-sequence to the next cycle" (IRM 3.13.222.16(2), Jan. 1, 2023). When the return and state charter do not settle it, the examiner asks you whether the event was a name change, a merger, or a new entity needing a new EIN (IRM 3.13.222.80(8), June 8, 2022).

Three rules protect the EIN you have. "Historically, a new EIN would be assigned to a corporation that has re-chartered. However, the underlying guidance or authority has determined if the business ownership remains the same, the original EIN should be retained" (IRM 3.13.222.19, Jan. 1, 2025; 3.13.222.36(1), July 29, 2025). A corporation that moves its charter to another state keeps its number: "the resulting state law corporation should use the EIN of the terminating corporation" (IRM 3.13.222.39(23), July 29, 2025). And "If two or more TINs are located for the same entity a consolidation should be input," with "Every attempt ... made to post the return to Master File before sending the consolidation" (IRM 3.13.222.19). A consolidated account shows filing requirements of all 8s; if the entity is the same under both numbers, "Do not reopen the account. Close to the correct EIN with URC 6" (IRM 3.13.222.89, July 29, 2025). A second EIN taken because the name changed is a future consolidation, not a fresh start.

Address rules

"The Address on the master file should never be updated from an extension" (IRM 3.13.222.36, July 29, 2025). A different address on a return with the change box unchecked is not used either; the filer gets Letter 104C and is directed "to www.irs.gov for a Form 8822-B." Accepted: Form 8822-B; a signed statement with full name and EIN; IRS correspondence returned with corrections; oral authority by phone under Rev. Proc. 2010-16. "A different address on a letterhead or return address on an envelope is not acceptable" (IRM 3.13.222.112, July 29, 2025). When no address can be found the unit inputs TC 971 AC 661, the undeliverable (UD) indicator, which blocks the letter tool until the address is fixed (IRM 3.13.222.2(9), Jan. 1, 2024): a business with a stale address stops receiving entity letters.

How long each step takes

A note on Form 945 filers

Form 945 has no unpostable procedure of its own here. It carries filing requirement code 1, a "tax return required to be mailed if filed" (IRM 3.13.222.33, Jan. 1, 2018), so no annual 945 is expected unless one arrives. A Form 945 (MFT 16) deposit never unposts for "no account" (IRM 3.13.222.42(1), July 29, 2025), but one that fails the name-control match re-sequences up to four cycles before it unposts as UPC 303 RC 2 (IRM 3.13.222.46, Jan. 2, 2019): about a month before anyone knows it is stuck.

Accounts the unit will not touch

A confirmed fabrication is resolved with URC 8 (IRM 3.13.222.89); a vendor in that state cannot be validated.

The checklist

1. File with the Secretary of State first; it is the source the unit uses (IRM 3.13.222.39(5), July 29, 2025).
2. Name the event: name change (TC 013), merger (TC 011), or new entity (IRM 3.13.222.80(8), June 8, 2022).
3. Do not apply for a new EIN for a re-charter or a move to another state with the same owners (IRM 3.13.222.19, Jan. 1, 2025; 3.13.222.39(23)).
4. Notify in a form the unit acts on: a signed statement with name and EIN, or a call from an authorized person; the address goes on Form 8822-B. Not an extension, not letterhead (IRM 3.13.222.39(8), 3.13.222.36).
5. Skip cosmetic changes; INC versus INCORPORATED is not keyed unless the name control moves, and a DBA identical to the legal name is dropped (IRM 3.13.222.39(6), (8)).
6. Hold filings under the new name until it posts: release is two cycles after input (IRM 3.13.222.44).
7. Expect Letter 147C only if the EIN changed, never on an election issue (IRM 3.13.222.13, Jan. 1, 2021; 3.13.222.39(9)). Request one by phone to confirm the name; see the Letter 147C page.
8. Tell your payers. The IRS notifies your reporting agent of a name-control change (IRM 3.13.222.45(7), Jan. 1, 2023); nobody notifies the customers who file 1099s to you. Send a new W-9 once the 147C shows the new name.
9. Calendar the clocks: 20 days, 45 if the unit writes, no Form 4442 for eight weeks (IRM 3.13.222.16(6), 3.13.222.8(1), 3.13.222.39.6).

Questions people ask