A C-corporation pays a flat 21% federal tax on profits, regardless of income level. For some owners, that beats the individual brackets they'd pay through an S-corp or LLC, especially when retaining earnings for reinvestment, planning a future sale (QSBS §1202 exclusion up to $15M), or running an SSTB above the QBI phaseout. The right strategy is often layering a C-corp onto an existing S-corp, not replacing it.