32 V.S.A. § 5293: Time limitation on assertion of defenses by taxpayer

If the taxpayer is a resident of the State, within six months or if he or she is a nonresident, within one year from the date when collection of the tax might first be enforced against him or her, he or she may assert as a defense against the collection of the tax lack of notice and opportunity to be heard in all proceedings relating to the levying of such tax, including the making of the appraisal and grand list.