Taxpayers who live in Maryland and work in Delaware must file income tax returns with both states. Always include the complete name of the entity and Maryland ID number in the subject line of the email.Getting answers to your tax questions. Getting tax forms, instructions, and publications. A complete listing of state tax forms and filing options. First, you'll fill out your personal information including your name, address, social security number, and tax filing status. Volunteers will fill out federal and state forms for those who qualify. Call the IRS at 1-800-829-1040 to find the nearest VRPP location. I am a Missouri Employer but I have nonresident employees who work in a state other than Missouri. States use a combination of the IRS W-4 Form and their own worksheets, which residents fill out to establish their withholding.