Tax Forms Below is a list of the most requested tax forms. Click on the blue link to pull up a pdf version of these documents.  SFS Wksht Contributions Worksheet  I-9 Employment Eligibility Verification Form  MW 507 Maryland Income Tax Withholding  REV-419 AS Employee's Nonwitholding Application (PA)  REV-420 AS Employee's Statement of Nonresidence (PA)  WV IT-104 Employee's Withholding Exemption Certificate (WV)  W-4 Federal Income Tax Withholding Don't see the form you need? Request a document by sending an e-mail to: karens@sfs-md.com