Professional services firms are among the most tax-disadvantaged business types under current law because of the SSTB classification under IRC 199A(d)(2). When the QBI deduction phases out, the professional services owner pays the full 37% (plus 3.8% NIIT on investment income) on pass-through income, while a comparable non-SSTB business owner pays an effective 29.6% (37% x 80%). This tax penalty, combined with the fact that professional services firms typically have minimal depreciable assets (no heavy equipment, no real estate, no manufacturing infrastructure), means the primary tax planning opportunities are in retirement plans, compensation structuring, and income timing. A solo attorney or consultant earning $600,000 who doesn’t optimize these strategies may be overpaying federal taxes by $50,000 or more per year compared to an optimally structured peer.
✓Key takeaway
SSTB impact on professional services firms:
Taxable Income Level
QBI Deduction (SSTB)
Tax Rate (Effective)
Annual Tax on $500,000 QBI
Below $197,300 (single)
Full 20%
29.6%
$148,000
$197,300 - $247,300 (phase-out range)
Partial
29.6% - 37%
$148,000 - $185,000
Above $247,300 (single)
$0
37%
$185,000
Annual QBI penalty at high income
7.4 percentage points
$37,000/year on $500K
Key tax planning levers for professional services:
Strategy
Potential Annual Savings
Defined benefit pension plan
$50,000-$90,000 (shelters $200K+ from current tax)
Solo 401(k) with catch-up
$23,500-$34,750 in tax savings (at 37%)
S-Corp reasonable salary optimization
$15,000-$30,000 in SE tax savings
Donor-advised fund bunching
$10,000-$25,000 (bunching + standard deduction alternation)
Cash method income timing
$10,000-$50,000 (year-end deferral of receivables)
HSA + high-deductible health plan
$3,180 (self-only) to $6,330 (family) in tax savings
What are the best tax strategies for professionals?
Do I need to collect sales tax on my services?
Whether services are subject to sales tax depends entirely on the state where the service is performed or delivered. Most states exempt professional services (accounting, legal, consulting) from sales tax, but a growing number tax specific services like repair and maintenance, landscaping, and personal care services. Some states tax all services unless specifically exempted, while others exempt all services unless specifically listed as taxable. If you operate in multiple states, you need to check each state’s rules because a service taxable in one state may be exempt in another. Failing to collect and remit required sales tax creates a personal liability for the business owner, and states can audit back several years with penalties and interest.
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Cite this page
Yarik Yarosh, CPA. "Tax Planning for Professional Services Firms: Attorneys, Consultants, and Advisors." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-tax-planning-professional-services-law-consulting