Mont. Code Ann. § 15-64-110 — Refunds -- Interest -- Limitations

15-64-110 . Refunds -- interest -- limitations. (1) A claim for a refund or credit as a result of overpayment of taxes collected under this part must be filed within 5 years of the date that the return was due, without regard to any extension of time for filing.
(2) (a) Interest paid by the department on an overpayment must be paid or credited at the same rate as the rate charged on delinquent taxes under 15-1-216 .
(b) Except as provided in subsection (2)(c), interest must be paid from the date that the return was due or the date of overpayment, whichever is later. Interest does not accrue during any period in which the processing of a claim is delayed more than 30 days because the taxpayer has not furnished necessary information.
(c) The department is not required to pay interest if:
(i) the overpayment is refunded or credited within 6 months of the date that a claim was filed; or
(ii) the amount of overpayment and interest does not exceed $1.