Montana Mont. LBF 36. DECLARATION of DEBTOR(S) UNDER PENALTY of PERJURY [MONT. LB 2003-5] is a legal document used to declare the amount of debt owed by a debtor(s). This document is used in the state of Montana and is signed and notarized under penalty of perjury. The document is also known as the Montana Penalty of Perjury Declaration. There are two types of Montana Mont. LBF 36. DECLARATION of DEBTOR(S) UNDER PENALTY of PERJURY [MONT. LB 2003-5]: 1. Joint Declaration of Debtors: This type of declaration is used when two or more debtors owe the same debt. 2. Individual Declaration of Debtor: This type of declaration is used when a single debtor owes the debt.