Home Business Taxes Business Income Tax 2018 Business Income Tax Forms and Instructions 2018 Business Income Tax Forms and Instructions Instruction Booklets Booklet Title Description Corporation Maryland Income Tax Form Instructions for Corporations Instructions for filing corporation income tax returns for the calendar year or any other tax year or period beginning in 2018. Pass-Through Entity Maryland Income Tax Form Instructions for Pass-Through Entities Instructions for filing pass-through entity income tax returns for the calendar year or any other tax year or period beginning in 2018. Corporation Income Tax Forms Number Title Description 500 Maryland Corporation Income Tax Return Form used by a corporation and certain other organizations to file an income tax return for a specific tax year or period. 500CRW Business Income Tax Credits Form used to claim selected business tax credits against corporation or personal income tax. An electronic return must be submitted to claim a business tax credit on Form 500CR. Maryland Form 500CRW Waiver Request for Electronically Filing Form 500CR must be submitted in order to file a paper version of Maryland Form 500CR. 500D Declaration of Estimated Corporation Income Tax Form used by a corporation to declare and remit estimated income tax for tax year 2018. 500DM Decoupling Modification Form used to determine the amount of addition and subtraction modifications that are required as a result of Maryland's decoupling from certain federal provisions listed on the form. 500E Application for an Extension to File Corporation Income Tax Return Form used to apply for an extension of time to file the corporation income tax return, and to remit any tax that may be due. 500UP Underpayment of Estimated Income Tax by Corporations and Pass-Through Entities Form and instructions used by corporations or pass-through entities to calculate the amount of interest and penalty for failure to pay the required amount of estimated income tax when due. 500X Amended Corporation Income Tax Return Form used by corporations to correct an error in a previously filed 2018 Form 500 or to claim a net operating loss (NOL) deduction. 502S Maryland Heritage Structure Rehabilitation Tax Credit 502S is used to calculate allowable tax credits for the rehabilitation of certified rehabilitation structures completed in tax year 2018. You must file your tax return electronically to claim a Heritage Structure Rehabilitation Tax Credit on a corporation or PTE return. Corporation Electronic Filing Forms Number Title Description EL101B Maryland Income Tax Declaration for Corporate Electronic Filing Form for corporate and pass-through entity filers to use to establish a signature document. EL102B Maryland Income Tax Declaration for Corporate Electronic Filing Form for corporate and pass-through entity filers to use to submit payment of any balance due on an electronically filed return, if the filers do not pay by credit card or direct debit. Pass-Through Entity Income Tax Forms Number Title Description 510 Pass-Through Entity Tax Return Form used for filing pass-through entity income tax return for the calendar year or any other tax year or period beginning in 2018. 510C Maryland Composite Pass-Through Entity Income Tax Return Pass-Through entities may use Form 510C to file a composite income tax return on behalf of eligible nonresident individual members. Nonresident members other than individuals may not participate in the composite return. 510D Declaration of Estimated Pass-Through Entity Tax Form used by a pass-through entity to declare and remit estimated tax for tax year 2018. 510E Application for Extension to File Pass-Through Entity Form used to apply for an extension of time to file the pass-through entity income tax return, and to remit any tax that may be due. 510 Schedule K-1 Maryland Pass-Through Entity Members Information Use Form 510 (Schedule K-1) to report the distributive or pro rata share of the member's income, additions, subtractions, nonresident tax and credits apportioned to Maryland. Miscellaneous Forms Number Title Description 548P Reporting Agent Authorization Form for taxpayer to appoint Reporting Agent with the authority to sign and file employer withholding and/or sales and use tax returns and make deposits electronically or on paper. Form also authorizes the Comptroller to disclose confidential information to Reporting Agent.