Normally the state identification number for withholding is the employer identification number on the 1099G. I would enter the Maryland tax identification number into box 10b. The 1099 Series are informational reporting forms submitted to the IRS by third parties. The IRS then matches the form information to your tax return to insure all income is reported and taxed. If you do not include a 1099 received from a third party on your tax return, you will receive a notice from the IRS asking why. This is the CP2000 matching notice. If you receive this notice from the IRS, make sure and respond by the date indicate on the notice.
