3.2 Registering your state payroll tax accounts

Last updated: July 23, 2026

To run payroll for employees in a state, two things have to be true: that state's tax agencies need to be able to collect the taxes that apply from your business, and your payroll provider needs permission to file and pay those taxes on your behalf. This article walks through what that involves. It's an owner-paced step that happens on your state's government portals, so give it time; agency processing can take days to weeks.

Register in every state where you employ W-2 staff, not just where your business is formed.

What You Register Varies by State

There's no fixed number of accounts per state. What applies depends on the state and on where your employees live and work:

  • Most states: an income-tax withholding account plus a state unemployment insurance (SUI) account. That's the common case.

  • No state income tax (for example, Texas): no withholding account to register.

  • Paid family and medical leave states: an additional program or account on top of the usual two.

So treat "withholding + unemployment" as the typical case, not a rule.

Let Expected Tax Notices Tell You What to Register

You don't have to guess which accounts a state needs. Alpaca's Expected Tax Notices derive the exact tax obligations from each employee's home and work address, so the list tells you precisely what to register for. If an unexpected state appears there, it means an employee has a home or work address tied to that state (see "Resolving Unexpected State Tax Requirements During Payroll Setup"). Work from that list, and use your state's guide for the how-to.

The Steps

1. Register your business with the state agencies that apply. For most states this is two agencies:

  • Department of Revenue (or equivalent) for income-tax withholding. You'll receive a withholding tax account number.

  • Department of Labor / unemployment insurance agency for state unemployment insurance (SUI). You'll receive a UI account number and an assigned UI rate.

Some states have fewer (no income tax) or more (paid family and medical leave). Names and portals differ by state; your state's guide has the specifics.

2. Grant Third-Party Administrator (TPA) access. So Alpaca's payroll provider can file returns and remit taxes for you, authorize it as a Third-Party Administrator with each agency. Every agency has its own way of authorizing a TPA; the state guide walks you through it.

3. Enter your account numbers and rates into Alpaca. Add your withholding account number, UI account number, and UI rate into your Alpaca payroll onboarding. Once these are in, payroll can file and pay correctly from your first run.

Find Your State's Guide

We keep a step-by-step guide for each state in the state payroll guides folder. Guides are available for:

  • Arkansas

  • Colorado

  • Georgia

  • Hawaii

  • Maryland

  • Minnesota

  • Nebraska

  • Nevada

  • New Jersey

  • Texas

  • Virginia

More states are added over time. Don't see yours? Email support@alpacahealth.io and we'll help you register.

Why This Matters, and What Happens If You Skip It

If a state can't collect the taxes that apply to you, or your provider isn't authorized as a TPA, you'll start receiving balance-due and failure-to-file notices from that state. These are one of the most common, and most avoidable, sources of payroll headaches. Registering correctly up front prevents them.

A related trap: employee work location drives which state's taxes apply. Make sure each employee's work location is set to where they actually work. If someone's home address is entered by mistake, it can trigger tax obligations (and notices) in the wrong state.

Tips

  • This step is owner and agency dependent, so it carries a longer target date and is never auto-flagged overdue. Start early, because agency processing can take weeks.

  • Register in every state where you have W-2 employees.

  • Let Expected Tax Notices tell you which accounts each state needs; don't assume a fixed count.

  • Keep your account numbers and UI rate handy; you'll re-enter the rate when it changes each year.

  • Stuck, or your state isn't listed? Email support@alpacahealth.io.