Hi there, @BillieM1.

I'll share information on why you're required to add withholding tax information for state tax when a change in the employees' address is made.

Same as what my colleague mentioned, some agencies have a reciprocity agreement. This means that the employee only pays taxes in one of those states. Some states, however, do not. The employee's withholding will be determined by both his or her home state and his or her place of employment.

You'll want to reach out to your state agency about this concern. Otherwise, you can your accountant or legal adviser about this.

Currently, the option to file or process the 943 forms is only available in the Desktop version. Though, you can download the form from the IRS website. 

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You can always comment back if you have other questions about state tax or QuickBooks. We're here to back you and your business. Stay safe!