1120ME Corporate income tax form (PDF) Corporate income tax instructions (PDF) - Revised March 2021 REVISED 2019 Additional Worksheet to Report Certain "Other" Modifications to Maine Income Related to Federal Tax Law Changes Enacted After December 31, 2019 (PDF) - Revised March 2021 Form CR - combined return for members of an affiliated group (PDF) Schedule NOL (PDF) Corporate unitary questionnaire (PDF) Corporate nexus questionnaire (PDF) 2220ME Underpayment of estimated tax (PDF) Annualized income installment worksheet for form 2220ME (PDF) 1120EXT-ME Extension payment voucher (PDF) Worksheets for Tax Credits