1. Short title This Act may be cited as the Municipal Bond Market Support Act of 2017 . 2. Permanent modification of small issuer exception to tax-exempt interest expense allocation rules for financial institutions (a) Permanent increase in limitation Subparagraphs (C)(i), (D)(i), and (D)(iii)(II) of section 265(b)(3) of the Internal Revenue Code of 1986 are each amended by striking $10,000,000 and inserting $30,000,000 . (b) Permanent modification of other special rules Section 265(b)(3) of such Code is amended— (1) by redesignating clauses (iv), (v), and (vi) of subparagraph (G) as clauses (ii), (iii), and (iv) of such subparagraph, respectively