Mont. Code Ann. § 15-16-603 — Refund Of Taxes -- Limitations On Refunds

15-16-603 . Refund of taxes -- limitations on refunds. (1) Subject to the provisions in subsections (2) and (3), a board of county commissioners shall order a refund:
(a) on a tax, penalty, interest, or cost paid more than once or erroneously or illegally collected if an appeal pursuant to 15-1-402 was not available;
(b) on a tax paid for which a refund is allowed under 15-16-612 or 15-16-613 ;
(c) on a tax, penalty, or interest collected as a result of an error in the description or location of real property or improvements or for duplicate taxes paid as determined by the department of revenue;
(d) on net or gross proceeds tax, centrally assessed property tax, penalty, or interest when the department of revenue notifies the board of county commissioners of an assessment revision completed pursuant to 15-8-601 ;
(e) upon entry of a decision either by the district court or by the Montana tax appeal board under 15-2-306 that has not been appealed to a higher court; or
(f) on a decision that a refund is payable as a result of a taxpayer prevailing in a motor vehicle tax or fee proceeding under 15-15-201 .
(2) The taxpayer shall prove that a refund is due under subsection (1)(a) or (1)(b).
(3) (a) A refund may not be granted under subsection (1)(a) or (1)(b) unless the taxpayer or a representative of the taxpayer files a written claim with the board of county commissioners within 10 years after the date when the second half of the taxes would have become delinquent if the taxes had not been paid, unless the refund is less than $10,000. There is a 15-year time limit for a written claim under this subsection (3)(a) if the amount of the refund is less than $10,000.
(b) The refund required under subsection (1)(c) must be made for 10 tax years or for the duration of the error, whichever period is shorter.
(c) A refund may not be made under subsection (1)(c) unless the taxpayer allowed the department of revenue access to the taxpayer's property for the purposes of appraising the property.