CREDIT FOR INCOME TAXES PAID TO OTHER STATES
If you are a Maryland resident (including a resident fiduciary) and you paid income tax to another state, you may be eligible for a credit on your Maryland return. Nonresidents (filing Form 505, 515 or 504) are not eligible for this credit.
Find the state to which you paid a nonresident tax in one of the following groups. The instructions for that group will tell you if you are eligible for credit and should complete Part A of Form 502CR. You must file your Maryland income tax return on Form 502 and complete lines 1 through 22 of that form, or on Form 504 and complete lines 1 through 23. Then complete Form 502CR Parts A and H and attach to Form 502 or 504.