Pass-Through Income (510D) Maryland: Business - Estimated tax and return (Form 510D) for nonresident members and shareholders 2nd installment due

Individual Income (502) Maryland: Individual - Individual Income Tax Return (Form 502) due

Individual Income (504) Maryland: Business - Fiduciary Income Tax Return (Form 504) due

Employment (MW-506) Maryland: Business - Quarterly depositors required to File Form MW506 for withheld income tax must deposit these taxes for the 1st quarter

Corporate Income/Franchise (500D) Maryland: Business - Corporate estimated tax (Form 500D) 2nd installment due