Mont. Code Ann. § 15-1-503 — Refund Of Overpayment -- Procedure

15-1-503 . Refund of overpayment -- procedure. (1) When there has been an overpayment of the estate tax collected by county treasurers or any other tax collected by the department and there is no law providing for a refund, the department shall refund the amount of the overpayment to the taxpayer, plus any interest and penalty due the taxpayer, as provided in subsection (2).
(2) A refund or payment is not allowed unless a claim is filed by the taxpayer before the expiration of 5 years from the time that the tax was paid. Within 6 months after the claim is filed, the department shall examine the claim and either approve or disapprove it. If the claim is approved, the credit or refund must be made to the taxpayer within 60 days after the claim is approved. If the claim is disallowed, the department shall notify the taxpayer and shall grant a hearing on the claim. If the department disapproves a claim after holding a hearing, the determination of the department may be reviewed as provided by 15-30-2608 .