7 Tax Mistakes Physicians Make in Their First Year of Private Practice
Sam's List Editorial | 2026-06-23
7 Tax Mistakes Physicians Make in Their First Year of Private Practice You spent a decade learning medicine and about ninety minutes learning taxes. Then you opened a practice and became a small business owner overnight. That gap is where the money leaks out. The most expensive physician private practice tax mistakes are not exotic. They are the same five or six errors, made by smart people who were busy seeing patients instead of reading the Internal Revenue Code. Here are the seven that cost new-practice doctors the most — and what good doctor tax planning does about each one. Mistake 1: Staying a sole proprietor when you're clearing $150K A solo practitioner reports profit on Schedule C and pays self-employment tax — 15.3% — on essentially all of it. Once your net income climbs past roughly $150K, that becomes one of the largest physician private practice tax mistakes by raw dollars. Here's the medical practice S-corp move. Elect S-corp status, pay yourself a reasonable W-2 salary, and take the rest as a distribution that is not subject to that 12.4% Social Security/Medicare layer. The math: on $300K of net income, say $150K is reasonable salary and $150K is distribution. The distribution dodges the 2.9% Medicare portion — and the salary still caps the 12.4% Social Security tax at the wage base either way. The realistic year-one savings often lands in the five figures, net of payroll costs. The catch the IRS cares about: your salary has to be reasonable . Pay yourself $40K and call the other $260K a distribution, and you've bought an audit. Reasonable comp is a real analysis, not a gut number. Mistake 2: Buying equipment in December without checking the Section 179 income limit Every new practice owner hears the same advice: buy the equipment before year-end and write it off under Section 179. For 2025, the Section 179 limit was generous — up to $2.5 million in qualifying property. But there's a line nobody mentions. Your Section 179 deduction cannot exceed your net business taxable income for the year. If your first-year practice barely broke even, that shiny $80K imaging machine doesn't deliver an $80K deduction this year. The excess just carries forward. So the December panic-buy can be a real own-goal — you tie up cash and don't get the deduction you bought it for. The fix is to model your actual net income first, then decide whether to expense, depreciate, or wait a year. Mistake 3: Forgetting quarterly estimated taxes in year one This is the single most common reason new-practice owners get hit with a penalty. No employer is withholding for you...
