The possible reason you are being charged for the MS Workforce Investment and Training Tax is that you have entered a tax rate in your payroll settings, k-s-trucking.
Please ensure that your payroll settings are correctly configured for Mississippi if this is the state where your employees are based.
Check out these articles to learn more about QuickBooks Online Payroll, adding employees, and other future payroll tasks for reference:
You can always respond to this forum if you have any further questions regarding the MS Workforce Investment and Training Tax. We are here to assist you.