APRIL
15th	File income tax returns for calendar-year partnerships (Federal Form 1065 for Federal and Form PR-1 for Montana) or request an automatic three-month extension (Federal Form 8736 and Montana Form PT-EXT).
JULY
15th	File partnership returns (use Federal Form 1065 and Form PR-1 for Montana) for which an extension was obtained or file Federal Form 8800 to request an additional three-months extension of time to file.
OCTOBER
15th	File a calendar-year partnership return (use Federal Form 1065 and Form PR-1 for Montana) if you have a second extension.
DECEMBER
31st	Last day for charitable contribution to be eligible on your tax return.