Mississippi Employer Tax Information

To sign up for Square’s online payroll services in Mississippi, you must be registered with the Mississippi Department of Revenue and the Mississippi Department of Employment Security so we can pay and file your state taxes.

Mississippi Tax Account Numbers

Mississippi Withholding Account Number and Filing Frequency

• If you are a new business, register online with the Mississippi Department of Revenue to retrieve your account number and filing frequency.

• If you are already registered with the Mississippi Department of Revenue,, you can find your account number and filing frequency online or on correspondence from the Mississippi Department of Revenue. Your Withholding Account Number will begin with 1.

• You can also retrieve your account number and filing frequency by contacting the agency at 601-923-7088.

Mississippi Employer Account Number

• If you are a new business, register online with the Mississippi Department of Employment Security.

• If you already have a Mississippi Employer Account Number, you can look this up online or find it on the Contribution Tax Rate Notice mailed by the Mississippi Department of Employment Security. You can also contact the agency at 601-923-7700.

Mississippi Payroll Tax Details

Square Payroll processes the following per the frequency below to the listed state agencies: