Tax Planning for Law Firms and Attorneys: SSTB Classification, Partner Compensation, and Practice Structure

By Yarik Yarosh, CPA ·September 5, 2026 ·7 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

Law is one of the enumerated SSTB categories under Treas. Reg. 1.199A-5(b)(2)(vi), defined as “the performance of services by individuals such as lawyers, paralegals, arbitrators, mediators, and similar professionals.” Unlike some industries where the SSTB classification depends on the business model (consulting vs. implementation, for example), legal services are categorically SSTB with no gray area. This makes the tax planning approach for law firms fundamentally different from non-SSTB businesses: the QBI deduction is either fully available (if income is below the threshold), partially available (in the phase-out range), or completely unavailable (above the threshold). The planning strategies therefore focus on either reducing income below the threshold (through retirement plans and deductions) or maximizing other tax advantages that do not depend on QBI (S-Corp payroll tax savings, PTET elections, deferred compensation, and timing of income and expenses).

✓Key takeaway

Law firm entity structures:

Structure	Common For	Tax Treatment	SE Tax
Solo practitioner (Schedule C)	Solo attorneys	Pass-through; SE tax on all net income	15.3% (up to SS wage base) + 2.9% Medicare
Solo practitioner (S-Corp)	Solo attorneys with $100K+ net	Pass-through; FICA on salary only	On salary only
LLP (general partnership)	Multi-partner firms	Partnership (Subchapter K); SE tax on distributive share	On guaranteed payments + distributive share
PLLC (taxed as partnership)	Multi-partner firms	Same as LLP	Same
PLLC (S-Corp election)	Small firms (2-5 partners)	S-Corp; FICA on salary	On salary only
PC (C-Corp)	Legacy firms; benefit planning	Double taxation (21% corporate + dividend)	On salary only

Law firm tax savings strategies (ranked by impact):

Strategy	Annual Tax Impact	Complexity
Retirement plan maximization (401(k) + cash balance)	$50,000-$130,000+ (deduction value)	Moderate
PTET election (bypass SALT cap)	$10,000-$100,000+ (depends on state rate and income)	Low
S-Corp payroll tax optimization (solo/small firm)	$5,000-$20,000	Low
Income deferral (cash method timing)	Variable	Low
Entity separation of non-SSTB activities	$0-$30,000 (depends on revenue mix)	High
Deferred compensation (IRC 409A)	Timing optimization	Moderate

How should law firms and attorneys minimize taxes?

Hypothetical example

Round numbers. A solo personal injury attorney earns $600,000 in contingency fee income through an S-Corp.

S-Corp payroll tax optimization:

Item	Schedule C	S-Corp
Net income	$600,000	$600,000
Owner salary	N/A	$250,000
SE tax	$36,168	N/A
Employer FICA	N/A	$19,125
Employee FICA	N/A	$19,125
Total payroll/SE tax	$36,168	$38,250

At $600,000, the S-Corp actually costs slightly more in FICA because the reasonable salary ($250,000) exceeds the Social Security wage base ($176,100), and the higher employer FICA on $250K exceeds what the Schedule C SE tax would be. The S-Corp savings are most significant when net income is $150,000-$400,000 and the salary can be set below the SS wage base.

However, with a $150,000 salary:

Item	Schedule C	S-Corp
Net income	$600,000	$600,000
Owner salary	N/A	$150,000
SE tax	$36,168	N/A
Employer FICA	N/A	$11,475
Employee FICA	N/A	$11,475
Total payroll/SE tax	$36,168	$22,950
Savings		$13,218

The risk: the IRS may challenge the $150,000 salary as unreasonable for an attorney generating $600,000 in revenue. The reasonable salary depends on the facts (how much of the revenue is from the attorney’s personal services vs. the firm’s brand, referral network, and staff).

Retirement plan strategy to recover QBI deduction:

Solo attorney, MFJ, spouse earns $100,000 W-2:

Item	Without Retirement	With Retirement
Practice net income	$600,000	$600,000
Spouse W-2	$100,000	$100,000
Owner S-Corp salary	($150,000)	($150,000)
401(k) deferral	$0	($23,500)
401(k) employer match (25% of $150K)	$0	($37,500)
Cash balance plan (age 52)	$0	($200,000)
Health insurance (family)	($24,000)	($24,000)
HSA	($8,550)	($8,550)
Taxable income	$517,450	$256,450

Without retirement plan: taxable income $517,450 (SSTB phase-out, QBI deduction partially available, ~40% phase-out) With retirement plan: taxable income $256,450 (BELOW the $533,900 MFJ threshold), QBI deduction fully available

Item	Without Plan	With Plan
QBI available	~$270,000 (partial phase-in)	$450,000
QBI deduction (20%)	~$54,000 (partial)	$90,000
Tax savings from QBI (37%)	~$19,980	$33,300
Additional QBI savings from retirement plan		~$13,320

Plus the direct tax savings from the retirement contributions: $261,000 x 37% = $96,570 in deferred taxes.

Multi-partner law firm (5 equity partners):

A mid-size firm with $5,000,000 in revenue and 5 equity partners:

Item	Amount
Revenue	$5,000,000
Associate salaries (8 associates x $130K avg)	($1,040,000)
Staff salaries (paralegals, admin)	($400,000)
Employer payroll taxes and benefits	($219,600)
Office rent	($300,000)
Malpractice insurance	($75,000)
Technology (Westlaw, Clio, document management)	($60,000)
Marketing and business development	($100,000)
Other overhead	($200,000)
Net income (to divide among 5 partners)	$2,605,400
Per partner (equal shares)	$521,080

Each partner’s taxable income ($521,080) exceeds the SSTB threshold (single: $266,950), so no QBI deduction is available.

PTET election example (New York):

New York’s PTET allows the firm to pay state tax at the entity level:

Item	Without PTET	With PTET
Partner’s state tax ($521K x 8.82% NY)	$45,959	$0 (paid at entity level)
SALT deduction (capped at $80K MFJ total)	$45,959 (if within cap)	N/A (deducted at entity level)
Entity-level state tax deduction	N/A	$45,959 (reduces federal taxable income)
Federal tax savings	$17,005 (37% of $45,959, if within SALT cap)	$17,005 (same, but no SALT cap limit)

The PTET is most valuable when the partner has other SALT deductions (property taxes, spouse’s state withholding) that would exceed the $80,000 MFJ cap. By moving the state income tax off the individual return, SALT cap space is freed up.

Partner compensation structures:

Structure	Tax Treatment
Guaranteed payment (IRC 707(c))	Deductible by partnership; ordinary income to partner; subject to SE tax
Distributive share (profit allocation)	Not deductible by partnership; taxable to partner; subject to SE tax
Salary (S-Corp partner)	Deductible by S-Corp; subject to FICA withholding
Draw (advance on distributive share)	Not income when received; reconciled at year-end

Of-counsel arrangement:

Factor	Employee (W-2)	Independent Contractor (1099)
Firm controls schedule	Employee indicator	Sets own schedule
Uses firm’s office, technology, staff	Employee indicator	Uses own resources
Carries own malpractice insurance	Contractor indicator	Firm covers
Has own clients	Contractor indicator	Assigned by firm
Risk of misclassification	Low if properly structured	High if firm controls work

Common law firm deductions:

Expense	Deductible?	Notes
Westlaw / LexisNexis subscriptions	Yes	Major expense for litigators
Bar dues (mandatory)	Yes
CLE (continuing legal education)	Yes
Client development (meals, 50%)	Yes (50%)
Expert witness fees (if advanced by firm)	Yes (when case costs are firm’s obligation)
Case costs advanced for clients	Depends	If reimbursable: loan, not expense; if firm bears risk: deductible
Malpractice insurance (tail coverage)	Yes
Trust account administration costs	Yes

Illustrative numbers only, not a real client and not advice for your facts.

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Cite this page

Yarik Yarosh, CPA. "Tax Planning for Law Firms and Attorneys: SSTB Classification, Partner Compensation, and Practice Structure." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-tax-planning-law-firm-attorney-sstb-partner-compensation

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.