(1) The department's ability to accept electronic payments is constantly evolving. Taxpayers should check the department's web site at www.mt.gov/revenue to determine which types of electronic payments the department will accept.

(2) A taxpayer with a tax liability of $500,000 or greater must make payment electronically:

(a) if by electronic funds transfer, to the Montana state treasurer; and

(b) if by other method accepted by the department, to the department.

(3) The tax return or report must be filed and the electronic payment initiated by the tax due date or the appropriate late filing and late payment penalties, and interest will be applied. If an electronic payment is initiated by the due date but either the department does not receive payment or credit, or the payment or credit is charged back, the tax liability is not discharged, the tax is not paid, and appropriate late payment penalties and interest will be applied.

(4) The following information must be included with any electronic payment:

(a) name and tax identification number of the taxpayer;

(b) type of tax or taxes being paid;

(c) amount of each type of tax being paid; and

(d) any additional information necessary to process the type of electronic payment being made and to identify the taxpayer and account to which the payment is to be applied.

(5) If a paper return or report is filed and payment made electronically, the taxpayer shall place on the tax return or report a notation, stamp, or other indication informing the department that payment was made electronically.