A sole proprietor pays self-employment tax on the entire net profit of the business. An S corporation owner pays payroll taxes only on the salary portion of their income; remaining profit flows through as distributions free of self-employment tax. The savings are the payroll tax avoided on the distribution portion.
The IRS requires S-corp owner-employees to take reasonable compensation — roughly, what you'd pay someone else to do your job — before taking distributions. This is the guardrail that limits the strategy: the salary portion still bears full payroll tax, and setting it artificially low is the classic S-corp examination trigger. A documented compensation analysis is the defense.
An S corporation requires a separate corporate return, formal payroll (even for just the owner), state registrations and minimum taxes in some states, and stricter bookkeeping. These carry real annual cost. Below a certain profit level, the administration eats the savings — which is why the election is generally premature until net profit comfortably clears the owner's reasonable salary with meaningful room to spare.
Lower reported wages can reduce retirement contribution capacity and, eventually, Social Security credits. Certain deductions and credits interact with entity choice. State treatment varies. The right analysis models your actual numbers across structures rather than applying a rule of thumb.
Meaningfully profitable owner-operated businesses usually benefit. Marginal ones usually don't — yet. The break-even is a calculation, not a slogan, and it deserves ten minutes of arithmetic before a lifetime of corporate formality.
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