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

Agency Required Tax Information Format
Missouri Department of Revenue Missouri Withholding Account Number XXXXXXXX (8 digits)
Missouri Department of Labor and Industrial Relations Missouri Employer Account Number XX-XXXXX-X-XX (10 digits)
Missouri Contribution Rate X.X%

Missouri New Employer Registration

Missouri Withholding Account Number & Employer Account Number

  1. Register online as a new business.
  2. You will receive both your Withholding Account Number and Employer Account Number within 2 weeks.

Missouri Contribution Rate

Most new employers are assigned a Contribution Rate of 2.7%. If you are unsure, contact the agency at (573) 751-1995.

St. Louis Earnings Tax Registration

As an employer doing business in St. Louis, you are required to remit two local taxes: St. Louis Earnings Tax and St. Louis Payroll Expense Tax. In order for Square Payroll to file and pay these taxes, you need to register as a new business with the City of St. Louis Collector of Revenue.

Kansas City Business Registration

Employers in Missouri must withhold Earnings Tax from employees earning wages in certain local tax jurisdictions, including Kansas City. In order for Square Payroll to file and pay your Kansas City taxes, you need to register as a new business online with the Kansas City Revenue Division.

Find Your Missouri Tax ID Numbers and Rates

Missouri Withholding Account Number

  • You can find your Withholding Account Number on any previous quarterly return, or on any notices you have received from the Department of Revenue.
  • If you’re unable to locate this, contact the agency at (573) 751-8750.

Missouri Employer Account Number

  • You can find your Employer Account Number on any previous quarterly report, or on any notices you’ve received from the Department of Labor and Industrial Relations.
  • If you’re unable to locate this, contact the agency at (573) 751-1995.

Missouri Contribution Rate

  • You can find your Contribution Rate on the Rate Notice sent by the Department of Labor and Industrial Relations in November.
  • If you’re unable to locate this, contact the agency at (801) 526-9235.

Missouri Payroll Tax Details

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

Agency Filing Frequency
Missouri Department of Revenue Withholding Payment Per Pay Run
Withholding Filing (Form MO-941) Monthly
State W-3s Annual
W-2 Reporting Annual
St. Louis Collector of Revenue St. Louis City Withholding and Payroll Expense Tax Filing/Payment (Forms W-10/P-10) Quarterly
St. Louis W-2 Reporting Annual
St. Louis Annual Reconciliation Annual
Kansas City Revenue Division Kansas City Withholding Tax Payment (Form RD-130) Per Pay Run
Kansas City Withholding Tax Filing (Form RD-110) Quarterly
Kansas City Annual Withholding Tax Filing (Form RD-113) Annual
Kansas City W-2 Reporting Annual
Missouri Department of Labor and Industrial Relations Unemployment Insurance Payment Quarterly
Unemployment Insurance Filing Quarterly
Missouri Department of Social Services New Hire Reporting Per New Employee

Exemption from St. Louis Payroll Expense Tax

Non-profit organizations are typically exempt from filing and paying St. Louis Payroll Expense Tax. To claim exemption, you must send a copy of your Letter of Determination issued by the IRS to the Collector of Revenue.

For more information, read these FAQs or contact the Office of the Collector of Revenue at (314) 622-4111.

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