There is a difference between filing your taxes correctly and paying the lowest tax the law allows. Most specialty practice owners get the first one. Very few get the second. That gap is not about loopholes; it is about structure, and most owners were never shown what setting things up on purpose looks like.
Your entity structure was probably set once and never revisited. As income grows, the structure that made sense at $300,000 in profit often stops making sense at $700,000. An S-corp election changes how much income is exposed to payroll tax, and the right owner salary moves as the practice grows.
Retirement plans are where the biggest number hides. Most owners put money into a basic 401(k) and assume that is the ceiling. A high-income specialist in the right structure can shelter far more through a defined benefit or cash balance plan: on the order of $150,000 to $290,000 a year depending on age and income, against roughly $70,000 for a Solo 401k alone.
At the top federal rate, sheltering that much is worth $55,000 to $107,000 back every year. Most owners contribute a fraction of it, because nobody ever ran the numbers.
This is not about competence. Compliance is backward-looking; it reports what already happened. Tax strategy is forward-looking; it changes what happens before the year closes. Those are two different jobs, and most owners only ever hired someone for the first.
Two questions get you most of the way there. When was the last time someone reviewed your entity structure against your current income? And has anyone ever run the numbers on a defined benefit plan for you? If the answer to either is never, that is the gap.