Mont. Code Ann. § 53-6-184

The purchaser of property pursuant to a writ of execution issued under 53-6-171 through 53-6-188 acquires the right, title, interest, and claim that the recipient had at the time the lien was imposed, subject only to any right, title, interest, or claim arising from an instrument recorded prior to the department's lien under 53-6-171 and to any unpaid property taxes. The sale is absolute and is not subject to any period of redemption allowed by Title 25, chapter 13, part 8, or other law.