Your residency status largely determines which form (paper or electronic) you will need to file for your personal income tax return.
If you are a Maryland resident, you can file long Form 502 and 502B if your federal adjusted gross income is less than $100,000.
If you lived in Maryland only part of the year, you must file Form 502.
If you are a nonresident, you must file Form 505 and Form 505NR.
If you are a nonresident and need to amend your return, you must file Form 505X.
If you are a nonresident employed in Maryland but living in a jurisdiction that levies a local income or earnings tax on Maryland residents, you must file Form 515.
If you are self-employed or do not have Maryland income taxes withheld by an employer, you can make quarterly estimated tax payments as part of a pay-as-you-go plan, using Form 502D.
If you owe additional Maryland tax and are seeking an automatic six-month filing extension, you must file Form 502E along with your payment by April 18, 2016. You should file Form 502E only if you are making a payment with your extension request.
If you need to make certain changes to your original Maryland return that has already been filed and processed, you must file Form 502X for 2015 to amend your original tax return.