A trust's IRS name control is a four-character code the IRS assigns when it issues the trust's EIN, used to match Form 1041 e-filings to its records. It is derived from the trust's legal name, though the exact rule depends on how the EIN was obtained. Find yours on the CP575 notice.
Key takeaways
- The name control is exactly four characters, drawn from the trust's name and locked in when the IRS assigns the EIN. You do not choose it; the IRS derives it.
- The derivation rule splits on how you got the EIN. Trusts with an EIN obtained online generally use the first four characters from the start of the trust name. Trusts with an EIN obtained by paper Form SS-4 generally use the first four characters of the individual's last name.
- Because of that split, the same trust name can carry two different valid name controls. The only reliable source of truth is what the IRS has on file, shown on your CP575 notice.
- Only the ampersand and hyphen are recognized as special characters. Leading words like "The" and descriptive words like "Trust" or "Fund" are ignored.
- A mismatch triggers e-file reject R0000-901-01 on Form 1041. If you cannot confirm the code, call the IRS Business and Specialty Tax Line at 1-800-829-4933 and request a 147C letter.
How the IRS derives a trust name control
The name control is the IRS's shorthand for identifying the entity behind an EIN. For a trust filing Form 1041, the IRS matches four characters against its records before the return is accepted. Get those four characters wrong and the return bounces, even if every dollar figure is correct.
The important nuance is that the IRS uses different derivation logic depending on how the EIN was originally assigned. This is where most confusion starts.
Trusts with an EIN obtained online (these EINs commonly begin with 20, 26, 27, or 45) use the first four characters from the beginning of the trust name, ignoring leading phrases like "Trust for the benefit of."
Trusts with an EIN obtained by paper Form SS-4 use the first four characters of the individual's last name when the trust is named after a person.
Beyond that split, a few consistent rules apply. Numbered trusts use the first four digits of the trust number. Trusts named after a company use the first four letters of the company name, dropping a leading "The." The ampersand and hyphen are the only special characters the IRS keeps; other punctuation is ignored, as are words like "Trust," "Fund," and "Irrevocable Trust."
Trust name examples and likely name control
These examples follow the IRS conventions, but treat them as educated guesses. The value on your CP575 always wins.
| Trust name (and how EIN was obtained) | Likely name control | Rule applied |
|---|---|---|
| Michael T. Azalea Revocable Trust (paper SS-4) | AZAL | Individual-named trust, paper EIN: first four of the individual's last name |
| John Smith Family Trust (paper SS-4) | SMIT | Individual-named trust, paper EIN: first four of the last name |
| John Smith Family Trust (online EIN) | JOHN | Online EIN: first four from the start of the trust name |
| Jonathan Periwinkle Memory Church Irrevocable Trust (online) | JONA | Online EIN: first four from the start of the name |
| Trust for the benefit of Bob Jones (online) | BOBJ | Online EIN: ignore "Trust for the benefit of," take next four characters |
| The Willow Company Employee Benefit Trust | WILL | Company-named trust: first four of the company name, drop "The" |
| Smith-Jones Family Trust (paper SS-4) | SMIT | Hyphen is allowed; count the first four letters |
| Numbered trust, no. 0456 | 0456 | Numbered trust: first four digits of the trust number |
Notice how "John Smith Family Trust" resolves to either SMIT or JOHN depending only on the application channel. That is not a contradiction. It is the reason you should confirm rather than assume.
How to find and confirm yours, and why e-file rejects happen
When the IRS assigns the EIN, it issues notice CP575 (the trust version is CP575B). The name control appears on the second page, in the four letters that follow the date on the "IRS Use Only" line. That notice is the cleanest record you have, so keep it with the trust documents. If you are handling a trust that needs a fresh EIN after the grantor dies, the EIN and notice process is the same, and the name control is set at that point.
If you cannot find the CP575, call the IRS Business and Specialty Tax Line at 1-800-829-4933 and ask for a 147C letter, which restates the EIN and the name control the IRS has on file.
E-file rejections happen when the name control on the return does not match the IRS record for that EIN. On Form 1041 that surfaces as reject code R0000-901-01. Common causes:
- Using the trust name convention when the EIN was actually issued on paper under the individual's last name, or the reverse.
- Filing too soon after the EIN was assigned. Newly issued EINs can take a couple of weeks to post to the IRS master file, and a return filed before then may reject even when the name control is correct.
- Typing the full trust name into software and letting it guess, rather than entering the exact four characters from the CP575.
How you name the trust at formation also shapes the name control you will live with, which is worth thinking through when you name a revocable living trust or set up parallel trusts that could share a similar name.
When in doubt, confirm with the IRS or your CPA
The IRS name control rules for trusts have real edge cases, and published guidance leaves room for interpretation on unusual names. Do not guess on a filing deadline. If the CP575 is missing or the return keeps rejecting, request the 147C letter from the IRS or hand the EIN and CP575 to your CPA to reconcile before you refile. Five minutes of confirmation beats a bounced return and a delayed distribution to beneficiaries.
Frequently asked questions
Where do I find my trust's IRS name control?
The name control appears on notice CP575, the trust version being CP575B, that the IRS issues when it assigns the EIN. It is the four letters that follow the date on the "IRS Use Only" line on the second page. Keep it with the trust documents. If you cannot find it, call the IRS at 1-800-829-4933 and request a 147C letter.
Why can the same trust name have two different name controls?
The derivation splits on how the EIN was obtained. A trust with an online EIN generally uses the first four characters from the start of the trust name, while a trust with a paper Form SS-4 EIN generally uses the first four characters of the individual's last name. So "John Smith Family Trust" resolves to either JOHN or SMIT depending only on the application channel.
What causes a Form 1041 e-file to reject with code R0000-901-01?
Reject code R0000-901-01 happens when the name control on the return does not match the IRS record for that EIN. Common causes include using the trust-name convention when the EIN was issued on paper under the individual's last name, filing too soon after the EIN was assigned before it posts, or letting software guess from the full trust name.
Which special characters does the IRS keep in a trust name control?
Only the ampersand and hyphen are recognized as special characters. Other punctuation is ignored, as are leading words like "The" and descriptive words like "Trust," "Fund," and "Irrevocable Trust." Numbered trusts use the first four digits of the trust number, and trusts named after a company use the first four letters of the company name.