Obligare / States / Montana / Montana personal income tax return with business income
Montana

Montana personal income tax return with business income

Report the business income on the owner's Montana personal return by April 15 each year.

When
By April 15 each year.
Agency
Montana Department of Revenue
Applies to
Sole proprietorships and single member LLCs formed in Montana, with US owners.
Source
mtrevenue.gov, read October 22, 2026
J
Jay explains

A sole proprietorship or single member LLC reports its income on the owner's Montana personal return, due April 15 each year in step with the federal Form 1040.

Next dates

For a calendar year company. Shown as the agency states them; if a date falls on a weekend, file before it.

Also in Montana

Montana annual reportMontana annual reportMontana annual reportMontana nonprofit annual reportMontana charitable solicitation registration: not requiredMontana corporate income tax returnMontana corporate estimated tax paymentMontana pass through entity returnMontana unemployment insurance wage reportMontana annual withholding reconciliationMontana sales tax: no state sales tax

See it on your company's calendar

Your company's compliance calendar

Three answers to start. Refine it after.

An LLC's tax treatment decides which federal return it files. Choose the line that matches yours. Nonprofits are covered too.
Count everyone on payroll. An S corporation's working owners are employees: they are paid a salary.
A company based outside its state of formation is registered in both and files in both.
More about the company: other states, payroll, dates, abroad
Other states where you have employees or an office
Other states where you have employees or an office
Each one adds that state's registration, employer and tax filings. A state where you only keep inventory or make sales belongs under sales tax states below, not here.
Date registered in each other state
Optional. Some states key their report to the day you registered there rather than your date of formation; without it, the formation date stands in and the calendar says so.
States where you collect sales tax
States where you collect sales tax
Needed for states that key filings to the anniversary of formation.
Some taxes start at a revenue threshold.
Outside the United States
Each adds the FinCEN or IRS form that comes with it: the FBAR, Form 5472, Form 5471, Forms 1042 and 1042-S.

No account needed. Nothing is stored until you save it.

Put it in your calendar

The calendar is free to read and to print. A subscription keeps it alive.

$190 a year ($15.83 a month), or $19 month to month
Put it in my calendar

Advisors: $49 a month for up to ten companies, $4 each after. Details