S corporations are corporations that elect to pass corporate income, losses, deductions, and credits through to their shareholders for federal tax purposes.
See S Corporations on IRS.gov for more information on the Small Business Corporation Election.
S corporations in Montana must file an annual Montana Pass-Through Entity Tax Return (Form PTE).
Montana S corporation returns are due at the same time as your federal Form 1120S:
If a due date falls on a weekend or holiday, it is due on the next business day.
Pass-through entity tax, pass-through withholding and composite taxes are due on the original due date of the Form CLT-4S.
Montana grants all S corporations an automatic six-month extension to file a return. This means returns filed on extension are due:
Extension deadlines are for returns only.
Any tax liability must still be paid by the original due date or it will be subject to uniform penalties and interest.