
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.










