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Mike Thrift

Marketing Manager

The Section 1375 Sting Tax: How Former C Corps Pay 21% on Passive Income and Lose Their S Election After Three Years

Section 1375 imposes a flat 21% sting tax on S corporations that carry C-corp earnings and profits when passive investment income exceeds 25% of gross receipts, and three consecutive years over that threshold terminates the S election automatically. This guide walks through the excess net passive income formula, the three-year cliff under Section 1362(d)(3), and three planning moves to defuse exposure before year-end.

The Section 1375 Sting Tax: How S Corporations Trigger the 21% Passive Income Tax and a Three-Year Termination Cliff

The Section 1375 sting tax hits an S corporation with a 21% corporate-level tax when it has C-corporation E&P and passive investment income above 25% of gross receipts; three consecutive years of that combination terminates the S election. This guide shows who is exposed, how excess net passive income is calculated, and how to defuse the trap.