What it is, who needs it, and how to get it.
You formed the business. You registered with your state. You have your EIN. One registration remains before your first payroll run: your state tax ID.
With your state tax ID in hand, you can set up payroll correctly: state withholding in place, tax deposits on your schedule, and filings tied to the right account from the start. You file each registration separately at a different agency — the state tax ID is the one you're here for.
With both IDs in hand, SurePayroll By Paychex is ready: enter them once during setup and state withholding, deposits, and year-end filings run on your schedule.
What is a state tax ID number?
Your state tax ID is a tax identification number issued by your state's revenue department. You use it for state income tax withholding on employee wages and for filing your state employment tax returns.
Depending on where you live, you may see it called state employer ID, state EIN, state withholding ID, and state tax account number. Different label, same registration.
This is the ID number that connects your payroll to every state filing and deposit from your first payroll.
When you have your state tax ID in hand, entering it into SurePayroll By Paychex is the step that connects your payroll to your state filing.
Business registration vs. employer registration
Business registration and employer registration are two separate actions at two separate agencies.
Business registration sets up your legal business entity: the LLC, S-corporation, or sole proprietorship with your secretary of state. That's your business name, your business structure, and your right to operate as a business.
Employer registration is what you need to do when you hire. To become an employer, file with your state's revenue department. When you're done, you have your state tax ID.
You form the entity when you launch your business. As a small business owner, you might hire your first employee shortly after, or years later.
Small business hiring held steady heading into April 2026, according to the Paychex Small Business Employment Watch. The U.S. Census Bureau counts roughly 491,000 new business applications a month, with nearly 29,000 projected to start payroll within four quarters (March 2026).
If you're one of the businesses making the move to employer status right now, employer registration is the step between hiring and legally running payroll.
Not sure whether your first hire is an employee or a contractor? The classification matters before you register. See the 1099 vs W-2 guide for the IRS rules before your first payroll.
State tax ID vs. EIN
Get your EIN from the IRS website at irs.gov. Get your state tax ID from your state's revenue department.
Here's how to get an EIN first so you have it for your state tax ID application. If you applied by mail, your EIN application form (SS-4) confirmation letter is what you'll reference for the exact legal name and structure tied to your EIN.
Do you need a state tax ID?
Yes, if your state collects state income tax.
Three setups worth checking:
Pay yourself a salary through an S-corp? You register as an employer, same as a 10-person business. The salary you draw counts as wages.
Operate as a sole proprietor with no employees? Skip employer registration. The day you bring on your first hire is the day you file.
Run payroll in one of nine no-income-tax states? You still register for state unemployment tax. Income tax withholding doesn't apply in Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, or Wyoming, but unemployment registration does, and some of those states issue a separate ID for it.
How to get a state tax ID number
You apply online with your state's revenue department. Each state runs the process slightly differently, but the steps line up.
Start at your state's revenue department website, the site ending in .gov. Look for "business tax registration," "employer registration," or "new business registration."
Most states route the application through a unified portal that covers multiple tax types in one filing.
Have these ready:
• Your EIN
• Your business name and business structure exactly as filed with your secretary of state
• Your first hire date (or planned hire date) and contact information for your business
File online and most states issue the state tax ID the same day or within a few business days. Paper applications can take two to four weeks. The form asks for your business details, your expected tax obligations, and a bank account for state tax deposits if the state collects that at signup.
Some states bundle state income tax withholding and state unemployment insurance into one filing. Others require a separate application for each. Check your state's FAQs before you start.
If your business operates in more than one state, you register in each state where you have employees. One state tax ID per state, each on its own portal, each on its own timing.
Plan ahead so the slowest state doesn't hold up payroll. If employees live and work in different states, state reciprocity agreements may affect which state's withholding applies.
Register before your first pay date. A few states accept late filings with back-dated wages, and the clean path is to have the state tax ID in hand the day your first employee starts.
Save the confirmation your state sends. Most states issue an acceptance letter with your state tax ID, your filing frequency, and your first filing due date.
Whether you run payroll yourself or work with a payroll service provider, you'll need all three on day one.
What to do with your state tax ID once you have it
What comes next depends on how you handle payroll.
If you're managing payroll yourself, keep your state tax ID on file with your EIN. You'll need both when you file state withholding returns, make tax deposits, and issue W-2s at year-end.
They're the two numbers that identify you as an employer to the IRS and to your state.
See how payroll works for small business.
You'll also use both IDs when you file your employer's quarterly federal tax return (Form 941) and your state's equivalent quarterly returns.
If you're using payroll software, you enter both IDs once during account setup. From there, both IDs appear on every form and filing that needs them: withholding returns, deposit records, W-2s.
Not sure what to expect on your first payroll? See the step-by-step guide to setting up your payroll account — it walks through exactly where both IDs go during setup.
At year-end, your state tax ID appears in box 15 of every employee's W-2. Enter it correctly from the start — it's easier than correcting it later. See the full list of employer tax forms you'll need for the tax year.
"SurePayroll helped me set up payroll for my S-corp. [My rep] was very prompt, patient, courteous, and professional … she walked me through processing my first payroll payment and setting up automatic payroll... Looking forward to taking this off of my plate as a single parent and business owner who wears too many hats."
— Jennifer H., BBB review
Run payroll from day one, with both IDs already in place
SurePayroll By Paychex is built for exactly this starting point. Enter your EIN and state tax ID once during setup — and payroll filings, deposits, and year-end forms stay on your schedule.
State withholding calculates automatically. Tax deposits go out on your schedule. W-2s generate at year-end with the right employer ID.
You did the registration work. You can handle what comes next with SurePayroll.
This content is for educational purposes only, is not intended to provide specific legal advice, and should not be used as a substitute for the legal advice of a qualified attorney or other professional. The information may not reflect the most current legal developments, may be changed without notice and is not guaranteed to be complete, correct, or up to date
