Hello there, Sognvalleyfarm.

As what my friend @Rasa-LilaM provided, some agencies have reciprocity agreements. This means that the employee only pays taxes in one of those states. Though, some states don't. The employee's withholding will be based on both the state of residence and the state of employment.

You may want to contact your state agency about this matter. Or, you can consult your legal adviser or accountant about this.

For now, only the Desktop version allows you to file and process the 943 form. Though, you can download the form from the IRS website.

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You're always welcome to post anytime if you have other concerns. Have a great day!