House Bill 39 was scheduled to hit the floor Thursday morning, but sponsoring Rep. Jim Ferrin opted to hold it until amendments were ready for consideration, too.

The proposed changes are expected to incorporate safeguards favored by some of the Orem Republican's colleagues: an audit of the program after a few years of operation, more explicit detail on how the credits will flow and an increase in the amount of money set aside to protect districts against financial losses.

HB39 proposes offering tax credits to parents who switch their children from public to private school.

The House vote is likely the final hurdle for the bill. That's the chamber where past tax-credit legislation has died despite strong support in the Senate.

HB39 would create a sliding scale that gives the largest annual tax credit, $3,750, to the lowest-income families and the smallest credit, $500, to families with moderately high incomes.