California Said No. New York Said 'Get Ethics Clearance.' Arizona Said Yes. Law Firms Chasing Outside Capital Now Need a Different Legal Structure in Every State.

The ABS compliance problem is no longer theoretical. California's AB 931, effective January 1, 2026, carries $10,000-per-violation fines for California attorneys who share fees with out-of-state alternative business structures. New York's NYSBA Ethics Opinion 1291, issued January 30, 2026, imposes a matter-by-matter "predominant effect" analysis before dual-admitted lawyers can practice through an ABS. Arizona has 150 licensed ABS entities, including KPMG's Big Four law practice approved by the Arizona Supreme Court in February 2025 and venture-backed AI firm Eudia, which raised over $100 million before launching its Arizona-licensed ABS. Managing partners of multi-office firms who treated the ABS question as someone else's problem now have three irreconcilable regulatory frameworks to architect around before accepting a dollar of outside capital.

The Three-State Divergence That Is Forcing Law Firms to Architect Around Their Own Rules

Arizona eliminated its version of Model Rule of Professional Conduct 5.4 in 2020 and built a permanent ABS licensing regime administered by the Arizona Supreme Court. As of early 2026, 150 entities hold active licenses under requirements that include biennial renewal, a mandatory compliance lawyer responsible for professional conduct oversight, civil penalties up to $1,000,000 for misconduct, and disclosure of any party holding 10% or greater ownership. IAALS research found a complaint rate of approximately one per 4,000 services delivered, with no evidence of increased consumer harm relative to traditional law firm rates.

California moved in the opposite direction. Governor Newsom signed AB 931 in October 2025, and the law took effect January 1, 2026, prohibiting California attorneys from sharing fees with out-of-state ABS entities under contingency-fee arrangements for California matters. The penalty structure is significant: $10,000 per violation or trebled actual damages, plus mandatory State Bar discipline. The law sunsets January 1, 2030, but that four-year window will determine which investment structures get built in the first wave, and firms designing capital structures now are designing around AB 931's constraints, full stop.

New York occupies middle ground, but it is expensive middle ground. NYSBA Ethics Opinion 1291 confirmed that New York does not permit ABS to practice law within the state but permits New York lawyers to hold financial interests in ABS entities operating in permissive jurisdictions. The specific conditions governing how those interests work are addressed below, and they carry ongoing operational costs that most capital structure analyses have not yet priced in.

What the DLA Piper MSO vs. ABS Framework Actually Requires Law Firms to Decide Before Accepting a Dollar

DLA Piper's January 2026 analysis of the two available investment models draws a structural distinction that firms routinely collapse: an ABS is direct equity in a law firm with nonlawyer ownership; an MSO is investment in a separate operational entity that provides services to a law firm that remains wholly lawyer-owned. The economic implications are significant. Under the MSO model, investors participate in the operational services business, but the law firm entity is the only entity that can receive legal fees. That constraint, confirmed by Texas Ethics Opinion 706 in February 2025, means MSO fees must be flat or cost-plus arrangements reflecting fair market value. Revenue-participation agreements and percentage-of-revenue structures are prohibited under a compliant MSO arrangement.

Sidley Austin's November 2025 analysis documented roughly a dozen MSO deals closing in 2025, concentrated in personal injury and mass tort practices where the MSO can own technology platforms, marketing infrastructure, and staff operations. For general practice firms, the MSO economics are harder to structure attractively, which is why ABS investment interest has concentrated in high-volume consumer-facing practices.

The ABS path offers cleaner equity economics for investors but creates a harder multi-state compliance burden. Arizona's program is the only permanent, fully operational ABS regime in the country (Utah's sandbox collapsed from 39 entities in 2022 to 11 by April 2025 after the Utah Supreme Court restricted participation, sending many entities to Arizona). An Arizona ABS cannot employ lawyers based in California, Texas, or New York who practice under the ABS structure without triggering Rule 5.4 violations in those states. Four structural workarounds exist: referral arrangements, pro hac vice admissions, temporary practice rules, and staffing company models. Each requires its own ethics analysis under every state where the firm operates attorneys.

NYSBA Opinion 1291: How New York's Ethics Clearance Requirement Travels With Your Attorneys Across State Lines

NYSBA Ethics Opinion 1291 (January 30, 2026) is generating compliance questions that most firms have not fully worked through. The opinion permits New York lawyers to hold financial interests in ABS entities operating in Arizona and to receive referral fees from such entities, but those referral fee arrangements must satisfy Rule 1.5(g) of the New York Rules of Professional Conduct, requiring client consent and a reasonable total fee.

The more operationally significant holding is the "predominant effect" test under Rule 8.5. A dual-admitted lawyer (admitted in both New York and Arizona) may ethically provide legal services through an Arizona ABS only when the particular conduct in rendering those services clearly has its predominant effect in a jurisdiction other than New York. That test is matter-specific. It cannot be satisfied once at deal closing; it requires an engagement-by-engagement analysis documented in the firm's intake and conflict systems.

For any multi-office firm with New York-admitted partners investing in or working through an Arizona ABS, Opinion 1291 means building engagement-screening procedures into practice management infrastructure. This is a recurring operational cost, not a one-time compliance exercise, and it must be factored into the economics of the capital structure from the outset.

Why California's Resistance Is a Structural Veto That Affects Every Multi-Office Firm

AB 931's four-year sunset generates optimism in some quarters that California's opposition is temporary. That optimism misreads the timeline. Firms structuring for outside investment now are making architecture decisions that will define their capital stack through at least the early 2030s. A firm with California as its largest revenue market that accepts ABS investment through Arizona must, under current law, segregate California-licensed attorney work from the ABS structure, restructure or terminate contingency-fee arrangements that involve fee-sharing with the ABS entity, and document that separation in a way that survives State Bar scrutiny.

Holland & Knight's September 2025 analysis of AB 931 confirms that the MSO pathway remains open in California, but only for arrangements using flat fees, with no referral or lead-generation payments, and with fees that don't scale with recovery amounts. That is a materially different economic proposition than what PE investors are seeking, and California's weight in the national legal market means firms cannot treat it as a jurisdiction to solve for later.

Illinois is moving toward a similar posture. Identical bills (SB3812 and HB5487) introduced in February 2026 would prohibit private equity groups and hedge funds, including entities operating through MSOs, from financial relationships with Illinois law firms. The House judiciary committee advanced HB5487 in March 2026, according to DLA Piper's February 2026 analysis. The patchwork is expanding, not contracting.

The Compliance Stack: What a Legally Defensible Multi-Jurisdiction Ownership Strategy Looks Like in Practice

Firms getting this right are working through a sequence of structural decisions before a term sheet is signed. The first is the MSO vs. ABS question, because that choice determines the applicable compliance framework for every subsequent decision. The second is a jurisdiction-by-jurisdiction mapping of attorney admissions against each state's Rule 5.4 equivalent, because Opinion 1291's "predominant effect" test means every New York-admitted partner in the structure carries an embedded ongoing compliance obligation. The third is a specific analysis of California and Illinois exposure, requiring a determination of whether to restructure fee arrangements to fit AB 931's MSO carve-out, segregate those matters from the investment vehicle, or accept that this revenue sits outside the capital structure entirely.

Sidley Austin's March 2026 deal architecture analysis reports that lenders and PE sponsors increasingly require this compliance mapping as a condition of closing, with documentation covering representations, covenants, and notices designed to preserve compliance through regulatory changes. A firm arriving at a deal without that analysis faces a delayed close or a price discount reflecting the compliance uncertainty being absorbed on the other side of the table.

The Firms That Get This Right Now Will Have a Structural Advantage When the Map Eventually Harmonizes

The regulatory map is not converging on any timetable that helps firms waiting for clarity. Puerto Rico approved 49% nonlawyer ownership in 2025. Illinois is advancing a bill that would restrict even MSOs. An Arizona State Law Journal analysis from January 2026 identifies multi-state compliance friction as the central barrier to ABS-model growth, a structural problem that self-corrects only through federal action or voluntary state harmonization. Neither is on a near-term horizon.

What is near-term is more capital flowing to firms that have already solved the multi-jurisdiction problem. KPMG is operating a Big Four law practice through Arizona's ABS program and competing for cross-border legal and consulting mandates. Eudia raised over $100 million to build an AI-native law firm through the same structure. These entities are not waiting for a cleaner regulatory environment. They are building compliance infrastructure under the current messy conditions and competing for legal work nationally.

The managing partners who architect defensible multi-jurisdiction ownership structures in 2026, through AB 931, Opinion 1291, and the Arizona program's requirements, will be operating investment-ready entities when the map does eventually move. Those who wait for regulatory clarity are, in practice, ceding the early structural advantage to the firms willing to do the compliance work now.