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C Corp vs S Corp for a Law Firm

Most US law firms operate as partnerships, LLPs, or PLLCs rather than corporations. The reasons: state bar restrictions on non-attorney ownership, the Personal Service Corporation flat 21% C corp rate, profession-specific ethics rules, and partnership tradition for capital and distribution flexibility.

Updated May 2026. Not tax or legal advice.

The verdict

Solo: PLLC with S corp election. Multi-attorney: LLP or PLLC taxed as partnership.

Solo practitioners may save on SE tax with S corp election once net profit is consistently above $90k. Multi-attorney firms typically use partnership taxation for capital account flexibility and to align with the partnership-track culture.

State bar restrictions on entity choice

ABA Model Rule of Professional Conduct 5.4 restricts non-attorney ownership of law practices. State bars enforce this through entity-formation rules. Most states allow:

General partnership (GP) of licensed attorneys
Limited Liability Partnership (LLP) for partner liability protection from co-partner malpractice
Professional Limited Liability Company (PLLC) restricted to licensed attorney members
Professional Corporation (PC) restricted to licensed attorney shareholders

Notable exceptions: Arizona (with the Alternative Business Structure rules) and Utah (regulatory sandbox) permit non-attorney ownership in limited circumstances. Most other states do not.

Source: ABA Model Rule 5.4

The PSC 21% flat rate (C corp election)

A law firm C corp is a Personal Service Corporation under IRC Section 448(d)(2). Flat 21% federal rate on every dollar. Combined with the second tax on distributions (up to 23.8% qualified dividend plus 3.8% NIIT), the C corp PSC effective rate on distributed earnings often exceeds 40% federal.

S corp avoids the entity-level federal tax. Partnership (the default for LLPs and multi-member PLLCs without S election) also avoids entity-level tax but exposes income fully to SE tax for general partners (limited partners may avoid SE tax on the limited interest portion under unsettled current case law).

Source: 26 U.S.C. Section 448(d)(2)

Why partnership wins for multi-attorney firms

Partnership taxation under Subchapter K offers structural advantages that S corp does not:

Special allocations under IRC Section 704(b) allow allocating specific items of income or deduction differently than capital accounts
Guaranteed payments under IRC Section 707(c) for service partners (analogous to salary but without W-2 mechanics)
Tax-free property contributions and distributions in most cases
Profits-interest grants (Rev Proc 93-27) to new partners without immediate tax
No reasonable salary requirement
Capital accounts that track each partner's contribution and share separately

S corp's pro-rata-per-share rule makes special allocations impossible. For a firm with origination credits, working attorney credits, and managing partner shares, partnership taxation matches the cultural reality.

Source: 26 U.S.C. Section 704(b); 26 U.S.C. Section 707(c)

SSTB QBI phaseout (universal for law firms)

Law is an SSTB under Section 199A. Above $241,950 single / $483,900 joint (2026 thresholds), the QBI deduction phases out. Most equity-track law firm partners are above the phaseout, eliminating the QBI deduction regardless of entity choice.

For solo attorneys below the phaseout (around $80k to $240k taxable), S corp election plus QBI typically saves $5k to $15k annually. Above the phaseout, S corp benefit shrinks to SE-tax savings on distributions above reasonable salary.

The reasonable salary issue for attorneys

BLS OEWS data for lawyers (occupation code 23-1011) shows median annual wage around $145,760 nationally for 2024, higher in major metros. A solo attorney S corp with $300k net profit cannot defensibly pay a $50k salary. Glass Blocks Unlimited v Commissioner (T.C. Memo 2013-180) reclassified $32k of distributions as wages for an underpaid S corp shareholder.

Source: BLS OEWS Lawyers (23-1011)

Sources

Educational only. Law firm entity choice involves state bar rules. Consult ethics counsel and CPA.

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