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C-Corp Retained Earnings at 21% Flat — Compound Below Personal Rates

C-corp reinvests profits at 21% flat vs pass-through 37% top rate — 16-point rate arb per dollar retained.

Overview

Post-TCJA, C-corps pay a flat 21% federal rate. Owners retaining earnings for growth/reinvestment (not distributing as dividends) compound wealth at 21% tax drag vs. 37% for pass-through owners in top brackets. Watch out for: (1) Accumulated Earnings Tax at 20% on retained earnings >$250K ($150K for PSCs) without documented business need, (2) Personal Holding Company tax if 60%+ passive income, (3) double tax on eventual dividends/liquidation (mitigated by §1202 QSBS). Ideal for capital-intensive, reinvestment-heavy businesses aiming for a QSBS exit.

Best fit
Growth-mode businessesFounders reinvesting >70% of profitQSBS-eligible C-corps
Estimated impact
16-point rate arbitrage per dollar retained

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