Wyo. Stat. § 16-4-108 (2026)

documentation of expenditures.

     (a) No officer or employee of a municipality shall make
any expenditure or encumbrance in excess of the total
appropriation for any department. The budget officer shall
report to the governing body any expenditure or encumbrance made
in violation of this subsection.

     (b) The expenditure of municipality monies, other than
employee contract payments, may be authorized by the governing
body when the payee has provided the municipality with an
invoice or other document identifying the quantity and total
cost per item or for the services rendered included on the
invoice or other document and the claim is certified under
penalty of perjury by the vendor or by an authorized person
employed by the municipality receiving the items or for whom the
services were rendered.