Sen. Delph has introduced SB 355. It would give a 10% increase to the per diem received by legislators who live more than 50 miles away from the state capitol building. According to the fiscal impact statement,(pdf) that would apply to about 105 of the 150 legislators.
The current amount is about $152 per day that legislators receive for a day during which they are performing legislative business (attending session days, attending interim study committees, etc.) The $15 per day bump for most legislators would increase expenses by about $190,000 for long sessions and $110,000 for short sessions.
The distance between a member’s residence and the state capitol shall be determined using the shortest of the more commonly traveled routes between the state capitol building and the legislator’s residence. (Given the past unpleasantness with determining our former Secretary of State’s residence, particular care should probably be taken to define “residence.”)