Sec. 22. Bonds issued under this article and: (1) proceeds received from their sale by a holder, to the extent of the holder's costs of acquisition; (2) proceeds received on their redemption before maturity; (3) proceeds received at their maturity; and (4) interest received on them; are exempt from state taxes as provided by IC 6-8-5. As added by P.L.189-2018, SEC.25.