Connecticut payroll tax and registration guide

Updated September 8, 2023

This article will cover:

• What information OnPay needs from you
• What state and local taxes and filings OnPay handles for Connecticut employers
• Where you can find the tax account numbers needed
• Paying employees in other states?

Why is this important?

The following information requests and registration instructions are required before you can use a payroll provider to run payroll. This is in compliance with state payroll tax regulations. Without this information, OnPay is unable to file or deposit any tax payments for your company, and will not be responsible for any resulting penalties or interest. Note: If this isn't the only state where you have employees, there will be a separate guide like this one for each state where you hire and pay workers. 

Let Middesk handle your state tax registrations (and more)

If you'd like help, our partner Middesk makes hiring employees and staying compliant with every state agency simple and easy.

• Register with every state agency to get the tax IDs you need within minutes
• Stay compliant as you grow by managing agency mail and notices in your dashboard
• Manage your government accounts in one place on Middesk's intuitive platform
• Foreign Qualify with the Secretary of State to create payroll tax accounts 

Learn more about Middesk→

What information OnPay needs from you

What state and local taxes and filings OnPay handles for Connecticut employers

Where you can find the tax account numbers needed

If you are an existing employer who has previously run payroll in Connecticut, you likely already have the IDs and online accounts needed for OnPay to process your tax filings. 

If you are a new employer in Connecticut, you will need to register your business with the Connecticut Department of Revenue and the Connecticut Department of Labor. This must be completed for OnPay to be able to file and pay your Connecticut taxes.

Withholding Tax Account Number

Existing Connecticut Employer: 

• You can find your withholding account number on notices received from the Department of Revenue.

New Connecticut Employer: Register with the Connecticut Department of Revenue 

• Register your business on myconneCT revenue services
• Select Create a Username, and follow the prompts
• You should receive your permanent CT Tax Registration Number and tax deposit schedule in approximately 10 business days when registering online, or immediately when registering in person
• Please note that the last 3 digits of the withholding account number are always 000
• You will need to register with this department if you have employees that both live and work in Connecticut. If your business is located outside of Connecticut, but your employees work or live in Connecticut you will need to register with this agency
  

Unemployment Account Number and Tax Rate

Existing Connecticut Employer: 

• You can find your Unemployment Account Number on notices received from the Department of Labor
• Your Unemployment Tax Rate can also be found on the right-hand side of the Tax Rate Notice

New Connecticut Employer: Register with the Connecticut Department of Labor

• Register your business online at ReEmployCT, Connecticut's Wage & Tax reporting system
• Click Register under "New Employer Registration", then follow the remaining prompts
• You should receive your CT Unemployment Number instantly
• You will receive a confirmation letter in the mail within one week
• You will need to register with this department if you have employees that work in Connecticut. If your business is located out of the state, but some of your employee's primary work location is in Connecticut, you will need to register with this agency
• New employers generally have a rate of 3% for SUTA with a wage base of $10,000

Paid Family and Medical Leave Account ID

Existing Connecticut Employer: 

• You can find your Connecticut Paid Family and Medical Leave Account ID on any CTPFML notices you've received.
• This account can only be created after your business has been registered at ct.org.

New Connecticut Employer: Register with the Connecticut Department of Labor

1. Visit Ctpaidleave.org and click on the sign in button in the upper right corner, and click SIGN UP NOW. If you haven't yet registered your business atct.org account, you'll be prompted to do so. After you've registered with ct.org, you'll be redirected to the CTpaidleave.org site.
   
2. Using the same credentials you used to create your account on ct.gov, click on the "SIGN IN" button in the upper right corner of the screen to log in.
3. Once logged in, select REGISTER YOUR BUSINESS in the blue bar across the top of the page. From there you will click on the START button next to Step 2.

Paying employees in other states?

If you operate in multiple states or just have employees working from home across a state line, it's important to file the correct state forms for those workers. See what forms we file in the states where you pay employees.

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