Anyone working out how to get an EIN in Arizona can relax on one point, as of 2026: the number is free. The IRS issues it online in about 15 minutes, often the same day.
Arizona doesn’t hand out its own EIN; it’s federal, identical in all 50 states. What’s local is what comes next: registering with the Arizona Department of Revenue, and once you hire, the DES.
How to Get Your Arizona EIN in About 15 Minutes
An Arizona EIN is just a federal Employer Identification Number, issued free by the IRS, online in about 15 minutes, and active the same day; Arizona itself issues no EIN, so state taxes are a separate registration with the Arizona Department of Revenue at AZTaxes.gov.
- Cost: $0 directly from the IRS, though third-party sites charge $150 to $300 for the same filing
- Time: about 15 minutes online, issued immediately on approval
- Who needs it: any LLC that hires employees, opens a business bank account, has multiple members, or elects corporate taxation
- Apply: the IRS Employer Identification Number page, or the IRS Business and Specialty Tax Line at 800-829-4933, Mon-Fri 7am to 7pm local time
- Arizona accounts: register through the Arizona Department of Revenue at AZTaxes.gov, not the IRS
Does Your Arizona LLC Need an EIN?
An Arizona LLC needs an EIN the moment it hires an employee, opens a business bank account, takes on a second member, or elects S-corp or C-corp taxation.
The one exception is a single-member LLC with no employees. It’s a disregarded entity for federal income tax, so the IRS lets the owner report on a Social Security number instead. That rarely holds up for long, because most Arizona banks won’t open a business account on an SSN alone.
Here’s how it breaks down by entity type:
| Business type | EIN required? | Notes |
|---|---|---|
| Single-member LLC, no employees | No, but recommended | Disregarded entity; an SSN works, but banks usually want an EIN |
| Single-member LLC with employees | Yes | Payroll and Arizona withholding both need it |
| Multi-member LLC | Yes | Taxed as a partnership by default |
| LLC electing S-corp or C-corp | Yes | The election (Form 2553 or 8832) is separate from the EIN |
| Sole proprietor | Only if hiring | Otherwise the SSN covers it |
| Partnership | Yes | Always required |
A multi-member LLC is treated as a partnership unless it files Form 8832 or Form 2553, and the federal number sits on that partnership return. It’s worth pairing the EIN with an Arizona operating agreement before any money changes hands.
How Do You Apply for an Arizona EIN, Step by Step?
Most Arizona owners finish online in about 15 minutes. The catch: the IRS tool times out after 15 minutes of inactivity, so it’s genuinely a one-sitting task.
Step 1: Confirm Your Arizona LLC Is Approved First
The IRS wants the exact legal name from your Arizona Corporation Commission filing, so the LLC has to be approved before you apply. If it isn’t yet, that’s the first job; see how long Arizona LLC approval takes so the name on the CP 575 matches the state record.
Step 2: Open the IRS EIN Assistant
Start the online EIN application on IRS.gov during its hours: Monday to Friday, 6am to 1am ET the next day; Saturday, 6am to 9pm ET; Sunday, 6pm to midnight ET.
Step 3: Choose Your Entity Classification
This is the screen that causes the most refilings. You’ll select limited liability company, enter the number of members, then confirm the IRS default treatment; enter the LLC’s exact legal name plus any DBA it operates under, and don’t pick “corporation” unless you’ve actually filed the election.
Step 4: Name the Responsible Party
The responsible party has to be a natural person with an SSN or ITIN, not a nominee and not another company. The IRS issues one EIN per responsible party per day, so anyone forming several LLCs has to pace them out.
Step 5: Submit and Download the CP 575 Now
The instant the EIN is assigned, save the CP 575 confirmation letter, because the IRS won’t mail a second copy. Banks, payroll providers, and the Arizona Joint Tax Application will all ask for proof of the federal number.
Arizona EIN Approval (EIN Confirmation Letter): Check Your CP 575 Before Using AZTaxes.gov
When the IRS approves your Arizona EIN online, the CP 575 is the confirmation letter that proves the federal number was assigned to your LLC. Check that the LLC name matches your Arizona Corporation Commission record before you use that EIN on AZTaxes.gov.
Roughly what the confirmation looks like
The CP 575 is not an Arizona TPT license, withholding account, or DES unemployment number. It is the IRS approval letter for your federal EIN, and it comes before the Arizona state account layer.
Example CP 575 confirmation letter layout.
Arizona filing tip: keep this letter separate from your later Arizona account numbers. The CP 575 proves the federal EIN; your TPT license, withholding setup, and DES unemployment account are handled afterward through the state registration process.
Can’t use the online tool? File Form SS-4 by fax to 855-641-6935 (about 4 business days with a return fax number) or by mail to the IRS EIN Operation in Cincinnati, OH 45999 (about 4 weeks). Applicants whose business is outside the U.S. apply by phone at 267-941-1099, Monday to Friday, 6am to 11pm ET; a domestic applicant without an SSN generally can’t use the online tool and files SS-4 instead.
The EIN is free straight from the Internal Revenue Service. Sites charging $150 to $300 are reselling a government filing you can do yourself at no cost, which is one reason some owners hand formation to a vetted Arizona LLC service and then apply for the EIN on their own.
I’ve watched Arizona founders open AZTaxes.gov, start the Joint Tax Application, and stall out because there’s no EIN to enter yet. The Arizona Department of Revenue can’t process a TPT or withholding registration without your federal number first. So I tell clients the EIN is the key that unlocks the state layer, not a separate errand to run alongside it.
Want help forming the LLC and getting the EIN handled correctly?
Your EIN application should match the approved Arizona LLC record, so it helps to get the formation details right first. Northwest Registered Agent can help with LLC formation, registered agent service, and EIN filing support if you prefer a guided workflow instead of handling each step separately.
What You Need to Apply for an Arizona EIN
Having a few things in front of you keeps the 15-minute session from stalling. None of it requires anything from Arizona beyond your approved formation paperwork.
- The approved LLC legal name, matching your Arizona Corporation Commission record exactly
- The ACC entity number and formation date
- The responsible party’s name and Social Security number or ITIN
- Your entity type and the reason for applying
- A business mailing address
Form the LLC first, then apply: that sequence is what keeps the CP 575 name aligned with the state filing. If you aren’t sure the name is clear, check it against the Arizona Corporation Commission record before you submit, and if the company isn’t on file yet, start your Arizona LLC before touching the IRS form.
EIN vs Your Arizona TPT License and Withholding Number
Arizona doesn’t issue a second EIN, but an LLC here can end up holding several numbers. The EIN is the LLC’s federal taxpayer identification number; the state accounts layer on top of it.
| Comparison point | IRS EIN (federal) | Arizona numbers |
|---|---|---|
| Issued by | Internal Revenue Service | Arizona Department of Revenue (ADOR) and Department of Economic Security (DES) |
| Used for | Federal returns, banking, payroll, state registrations | TPT and use tax, withholding, unemployment insurance |
| Who needs it | Almost every LLC | LLCs with taxable sales, employees, or Arizona payroll |
| Where to get it | IRS, free | AZTaxes.gov via Form JT-1/UC-001; DES processes UI separately |
The detail worth knowing: ADOR uses your EIN as the withholding ID once you register, but the TPT license number and the DES unemployment account are separate 8-digit numbers from two different agencies. One federal number, several state account numbers.
How to Register for Arizona Taxes After You Get Your EIN
The EIN unlocks Arizona’s combined registration, the Arizona Joint Tax Application, Form JT-1/UC-001, filed on AZTaxes.gov. It covers Transaction Privilege Tax, use tax, employer withholding, and the start of unemployment registration.
Transaction Privilege Tax, Arizona’s Version of Sales Tax
Arizona’s equivalent of a sales tax permit is the Transaction Privilege Tax license, and it’s legally a tax on the seller for the privilege of doing business in the state. The state fee is $12, the license renews every calendar year, and any business with Arizona physical presence needs it regardless of sales volume.
Remote sellers and out-of-state marketplace facilitators register once they pass more than $100,000 in gross Arizona sales. A seller working only through a marketplace facilitator generally doesn’t need its own TPT license.
Employer Withholding Through ADOR
If your LLC pays wages for services performed in Arizona, you register for employer withholding with ADOR on the same JT-1. Employees set their rate on Arizona Form A-4; when they don’t file one, the employer withholds at 2.0%.
DES Unemployment Insurance
Unemployment runs through the Arizona Department of Economic Security, not ADOR. Liability kicks in at $1,500 or more in wages in a calendar quarter, or one worker for part of a day in 20 different weeks; for 2026 the taxable wage base is $8,000 and the new-employer rate is 2.00%.
City, town, or county licenses can still apply on top of all this, and keeping a dependable Arizona registered agent on file is how those state notices reach you instead of getting lost. There’s no general Arizona franchise or margin tax on LLCs.
The Joint Tax Application looks like one form that registers everything at once, and that’s exactly the trap. In my experience, the TPT and withholding pieces go live with ADOR quickly, but DES handles unemployment on its own track and mails a liability determination weeks later.
Arizona EIN Mistakes That Cost LLC Owners Time at ADOR and DES
In Aaron Kra’s experience filing across 25-plus states, the EIN itself is rarely where Arizona owners go wrong. The trouble clusters around what they assume the number covers once the state layer starts.
- Picking the wrong entity classification on the EIN screen, then having to correct the IRS record
- Listing a nominee or another company as the responsible party instead of a real person
- Applying for a duplicate EIN when one already exists
- A legal name that doesn’t match the Arizona Corporation Commission filing
- Assuming the EIN covers TPT; it doesn’t, and the license still comes from ADOR
- Treating the ADOR withholding ID and the DES unemployment number as one and the same
Every few months an Arizona married couple asks me to list both spouses as joint responsible parties on the EIN. The IRS recognizes one responsible party, full stop. Arizona’s community property status does open special federal classification options under Rev. Proc. 2002-69, but that’s a tax-return decision, not something you settle on the SS-4.
The right federal treatment of a spouse-owned Arizona LLC depends on how the couple holds and reports the business, so it is worth confirming with a tax professional before filing.
How to Find a Lost Arizona EIN or Update Your LLC
A misplaced EIN is usually recoverable without reapplying. It’s printed on the CP 575, prior federal returns, payroll filings, and your business bank records.
If none of those turn it up, you can find a lost EIN on your records or ask the IRS for a 147C verification letter, since it won’t reissue the CP 575. Your Arizona numbers live elsewhere: TPT and withholding inside AZTaxes.gov, the unemployment account inside the DES Tax and Wage System.
A new EIN is only needed for structural changes, like a single-member LLC adding members or a sole proprietorship converting to an LLC. Routine updates don’t trigger one; a name or address change goes on Form 8822-B, and Arizona’s light post-formation load, with no LLC annual report at all, is worth knowing as part of your ongoing Arizona compliance.
Arizona EIN Questions LLC Owners Ask Most
Short answers to what comes up most often when Arizona owners sit down to apply.
Is an Arizona EIN different from a federal EIN?
No. There’s one EIN, issued by the IRS, and it reads the same whether the LLC is in Arizona or anywhere else. Arizona issues its own separate tax account numbers, not a separate EIN.
Does Arizona issue a separate state tax ID number?
Arizona issues no state EIN, but it can assign a separate 8-digit TPT license number and a separate DES unemployment account number. Your withholding ID, though, is just your federal EIN.
Is an Arizona TPT license the same as a sales tax permit?
Functionally close, legally not identical. Transaction Privilege Tax taxes the seller for the privilege of doing business in Arizona, so the legal liability sits with the business, but owners search for it as a sales tax permit and land in the same place.
Do remote sellers need an Arizona TPT license, and what’s the 2026 threshold?
Yes, once they cross it. A remote seller or marketplace facilitator registers after more than $100,000 in gross Arizona sales; below that, with no physical presence in the state, no TPT license is required.
How does a married-couple Arizona LLC handle the EIN responsible party?
The application takes one responsible party, even for a two-spouse LLC. Because Arizona is a community property state, the couple’s federal classification can differ, so they name one responsible party and settle the tax treatment separately with their accountant.
Can a foreign-owned Arizona LLC get an EIN without an SSN?
Yes. An owner with no SSN or ITIN can’t use the online tool, so they file Form SS-4 by fax or mail, and applicants based outside the U.S. can apply by phone at 267-941-1099.
Do single-member Arizona LLCs need an EIN?
Not strictly, with no employees, since the LLC is disregarded for federal tax. Even then a business bank account almost always requires one, and getting it early costs nothing next to the state fees, which start at $12 for a TPT license depending on what an Arizona LLC costs to set up.
Looking for an overview? See Arizona LLC Services
Apply for an Arizona EIN with Harbor Compliance
Need an EIN for your Arizona business? Harbor Compliance can help you complete the online application process so your business is ready for banking, hiring, and tax setup.
