Idaho Code § 18-113A: Punishment for infraction.

Every offense declared to be an infraction is punishable only by a penalty not exceeding three hundred dollars ($300) as provided in this section and no imprisonment. The penalty for an infraction shall be:

(1) The amount set by statute;

(2) Subject to subsection (1) of this section, the amount set as a fixed penalty for that infraction as of January 1, 2014, by the Idaho supreme court infraction rule 9, excepting subsection (38) of infraction rule 9 for "other infractions";

(3) The amount set by city or county ordinance for which the city or county has authority to impose a penalty and which is not otherwise set under subsection (1) or (2) of this section; or

(4) Fifteen dollars and fifty cents ($15.50) for an infraction without a specific penalty set under subsection (1), (2) or (3) of this section.