Two doctors doing identical work face a 7-plus point federal rate gap because ownership unlocks S corp distributions, QBI deductions, and rental income the W-2 employee cannot touch. Section 199A bars high-earning doctors from deducting clinical fees, so practice owners redirect savings through ancillary services, real estate rentals, and payroll-exempt distributions to hit the high twenties. Salaried high earners can still narrow the gap by maxing a mega-backdoor Roth, funding an HSA, and routing any side business through its own entity.
Two retirees, same $1 million, same 4% rule, buy one finished with $1.4 million, the other hit $0 in 12 years. Our free reader guide explains the flaw that separated them, and the income-first method built to avoid it. Same waiting room, same procedures, same billing codes.
One draws a W-2 from the hospital system; her top wages hit the 37% federal bracket plus the 0.9% additional Medicare tax on high earners. The other owns her practice through an S corporation and can land her effective federal rate under 30%. When Congress wrote Section 199A in 2017, it handed pass-through business owners a 20% deduction on qualified business income (QBI).
Pass-through means the business itself pays no federal income tax; profits flow to the owner's Form 1040. An S corporation is the classic vehicle. But the statute drew a line around what it calls specified service trades or businesses: medicine, law, accounting, consulting, financial services.
Above the income phase-outs, the owner of one of these businesses gets no QBI deduction on the professional service itself. A cardiologist's fee for reading an echo does not qualify. A practice-owning doctor cannot simply deduct clinical income.
The mechanism is subtler. She reclassifies everything sitting next to the clinical fees, which are stuck as service income. Every retiree knows about the 4% rule, but it frames retirement as a slow liquidation and still causes retirees with seven-figure accounts to agonize over a dinner out.
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