bulletin Internal Revenue›Rev. Proc. 90-63, 1990-2 C.B. 664, is
SECTION 2. BACKGROUND
Internal Revenue Bulletin 1997-33 · 2026-10-03 edition · updated 2026-10-04 · United States
Section 1361(a)(1) defines an “S corporation,” with respect to any taxable year, as a small business corporation for which an S election is in effect for that year.
Section 1362(a)(1) provides that, except in a situation described in § 1362(g), a small business corporation may elect to be treated as an S corporation.
Section 1362(b)(1) provides that the corporation may make an election to be treated as an S corporation (A) at any time during the preceding taxable year, or (B) at any time during the taxable year and on or before the 15th day of the 3rd month of the taxable year. Under § 1362(b)(3), if an S corporation election is made for a taxable year after the 15th day of the 3rd month of that taxable year and on or before the 15th day of the 3rd month of the following taxable year, then the S corporation election is treated as made for the following taxable year.
Section 1362(b)(5) provides that if (A) an election under § 1362(a) is made for any taxable year (determined without regard to § 1362(b)(3)) after the date prescribed by § 1362(b) for making the election for the taxable year or no election is made for any taxable year, and (B) the Secretary determines that there was reasonable cause for the failure to timely make the election, the Secretary may treat the election as timely made for the taxable year (and § 1362(b)(3) shall not apply).
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