Mont. Code Ann. § 15-36-315 — Credit Or Refund For Overpayment -- Refund From County -- Interest On Overpayment

15-36-315 . Credit or refund for overpayment -- refund from county -- interest on overpayment. (1) If the department determines that the amount of tax, penalty, or interest due for any taxable period is less than the amount paid, the amount of the overpayment must be credited against any tax, penalty, or interest then due from the taxpayer and the balance refunded to the taxpayer or its successor through reorganization, merger, or consolidation or to its shareholders upon dissolution.
(2) (a) The amount of an overpayment credited against any tax, penalty, or interest due for any tax period or any refund or portion of a refund, which has not been distributed pursuant to 15-36-332 , must be withheld from the current distribution made pursuant to 15-36-332 .
(b) If the amount of the refund reduces the amount of tax previously distributed pursuant to 15-36-332 and if the current distribution, if any, is insufficient to offset the refund, then the department shall demand the amount of the refund from the county to which the tax was originally distributed. The county treasurer shall remit the amount demanded within 30 days of the receipt of notice from the department.
(3) Except as provided in subsection (4), interest must be allowed on overpayments at the same rate as is charged on unpaid taxes provided in 15-1-216 beginning from the due date of the return or from the date of overpayment, whichever date is later, to the date on which the department approves refunding or crediting of the overpayment.
(4) (a) Interest may not accrue during any period in which the processing of a claim for refund is delayed more than 30 days by reason of failure of the taxpayer to furnish information requested by the department for the purpose of verifying the amount of the overpayment.
(b) Interest is not allowed:
(i) if the overpayment is refunded within 6 months from the date on which the return is due or from the date on which the return is filed, whichever is later; or
(ii) if the amount of interest is less than $1.