Sell Your CPA Firm in Maine (2026): Valuation, PE Buyers & APS Deal Structure

CPA firm M&A is the freshest hot roll-up in US services, and that matters if you own a CPA firm in Maine. Cornerstone’s CPA Trendlines deal tracker logged 86 PE-touched CPA transactions in 2025 and 52 transactions in just January-February 2026 — more than three times the prior-year pace. PE-backed buyers now account for roughly 25-30% of all US CPA firm transactions, up from less than 10% just five years ago. The structural reasons are simple: the partner-succession crisis is real (75% of US CPAs reached retirement eligibility by 2024, the average partner is 52-53 years old, and fewer than half of firms have a written succession plan), advisory and Client Accounting Services revenue behaves like SaaS-style recurring revenue, and PE buyers can write a check today versus the ten-year internal note that internal succession requires.

This guide covers what a Maine CPA firm is worth in 2026 and how to sell it well. We walk through 2024-2026 multiples by size tier, the recurring revenue premium and partner-compensation add-back math that buyers underwrite, the named PE-backed platforms actively acquiring across the US, the sub-vertical hierarchy (1040 tax, attest, CAS / advisory, specialty), the state-specific Board of Accountancy and Alternative Practice Structure regulatory landscape that governs every CPA firm sale, the AICPA APS Exposure Draft of December 2025 that will re-paper APS structures across the industry, and the deal mechanics specific to CPA firm sales — client retention earnouts, partner non-competes, E&O tail coverage, and the seven-year working-paper retention.

CT Acquisitions runs confidential, buy-side processes. We are not a business broker — the buyer pays our fee, and a seller pays no commission, no retainer, and signs no exclusivity contract. For broader context, see our lower middle market buyer mandate report and the exit multiple operator’s guide. The free valuation survey takes about three minutes.

How Maine CPA firms are valued in 2026 — the tiered multiple framework

CPA firm M&A multiples in 2024-2026 are deeply tiered. The rule-of-thumb baseline for small and mid-market firms remains 0.8-1.5x annual revenue (median around 1.0x) or 3-7x EBITDA, but PE-backed buyers have pushed the upper bands sharply. Owner-dependent firms under $1M revenue trade at 3.0-4.0x EBITDA. Mid-size firms with $2M-$10M revenue and a real management team trade at 4.0-5.5x EBITDA, with the cleanest assets reaching 6x. Platform-quality acquisition candidates trade at 5-7x EBITDA. PE-backed roll-up targets routinely reach 6-8x EBITDA and higher. On a revenue basis, sub-$1M firms trade at 0.6-1.0x, $1-3M at 0.9-1.3x, $3-10M at 1.1-1.6x (where PE platforms enter), and $10M+ firms at 1.4-2.0x or more. At the top of the market, New Mountain Capital re-traded Citrin Cooperman to Blackstone at approximately 15x EBITDA in 2025, growing the firm from $500M in 2021 to $2B in 2025 — illustrative of the headline multiple expansion at the platform-quality scale.

CPA firm profile	Typical multiple	What moves it
Owner-operated firm under $1M revenue	0.6-1.0x revenue / 3.0-4.0x EBITDA	Owner-dependence, pure 1040 mix, no recurring CAS
$1M-$3M revenue firm	0.9-1.3x revenue / 3.5-5.0x EBITDA	Mix of tax + attest, retention above 90%, second-tier partner present
$3M-$10M firm (PE platform sweet spot)	1.1-1.6x revenue / 4.0-5.5x EBITDA (clean assets to 6x)	Real management team, recurring CAS book, advisory cross-sell evidence
$10M+ firm (platform-quality)	1.4-2.0x revenue / 5-7x EBITDA	Tuck-in or sub-platform role for active consolidators
Headline PE platform recap	Up to ~15x EBITDA (Citrin Cooperman to Blackstone, 2025)	The platform multiple — the arbitrage tuck-in sellers feed

The pattern that matters: the platform-versus-tuck-in arbitrage is wide. A $3M-revenue firm tucks in at 1.1-1.6x revenue, but the platform itself re-trades at 1.4-2.0x+ revenue and the headline platform recaps (Citrin Cooperman to Blackstone at roughly 15x EBITDA in 2025) sit well above the tuck-in band. The platform multiple is driven by AI-enabled margin expansion, the recurring-CAS thesis, and cross-sell from tax compliance into advisory, valuation, R&D credits, and wealth.

The recurring revenue premium — CAS, advisory, and the SaaS-style thesis

Firms with 80%+ recurring revenue consistently transact 0.2-0.4x revenue above otherwise-comparable peers. Recurring revenue in a CPA firm comes from three places, in ascending value-per-dollar order: annual tax compliance (quasi-recurring), annual attest engagements (highly recurring with a regulatory moat), and monthly retainer CAS / outsourced CFO (highest multiple, behaves like SaaS-style recurring revenue). A recurring CAS dollar is worth roughly 1.3-1.5x of a tax-prep dollar in the multiple. This is why PE platforms underwrite advisory mix so aggressively: the bullish AI thesis is that advisory-heavy firms expand margin 25%-to-35-40% while basic tax/compilation work commoditizes — and the buyers paying top multiples are positioning for the winning side of that thesis.

Partner-compensation add-backs and what Maine buyers actually underwrite

Adjusted EBITDA in CPA firm sales is dominated by the partner-compensation add-back. For owner-operated firms, buyers normalize working-partner pay to fair-market levels (typically $250K-$450K depending on role and region) and add back the excess above-market draw — this is usually the single largest line item moving the deal value. PE buyers stack additional add-backs: one-time legal and accounting deal costs, abandoned office leases, founder personal expenses run through the firm. A typical add-back stack lifts reported EBITDA by 20-40% on owner-dependent firms. Contingent or success-fee revenue (R&D credit work, ERC pure-play) is scrutinized for sustainability; ERC pure-plays carry a heavy discount post-IRS moratorium and 2024 enforcement actions.

Platform-versus-tuck-in arbitrage — why the multiple gap is the seller’s opportunity

CPA firm consolidation is the freshest hot roll-up in services, with PE-backed buyers accounting for roughly 25-30% of all US CPA firm transactions in 2025, up from less than 10% five years prior. The Cornerstone CPA Trendlines deal tracker logged 86 PE-touched transactions in 2025 and 52 in just January-February 2026 — more than three times the prior-year pace. The platform-versus-tuck-in arbitrage is wide: a $3M-revenue firm tucks in at 1.1-1.6x revenue, but the platform itself re-trades at 1.4-2.0x+. The platform multiple is driven by AI-enabled margin expansion and cross-sell from tax compliance into CAS, advisory, valuation, R&D credits, and bolt-on wealth advisory.

Who is buying Maine CPA firms in 2024-2026 — named platforms and deal flow

Active US CPA consolidators in 2024-2026 split into Top-10-firm-scale platform deals and active roll-up acquirers. At the platform scale: Grant Thornton US took a majority investment from New Mountain Capital, announced March 2024 and closed June 2024, under an Alternative Practice Structure (Grant Thornton LLP for attest, Grant Thornton Advisors LLC for non-attest). Grant Thornton UK separately took a Cinven investment in November 2024, closed April 2025. Baker Tilly combined with Moss Adams in a Hellman & Friedman and Valeas transaction announced April 2025, closed in 2025, at approximately $7B in deal value, creating the sixth-largest US CPA firm with $3B+ combined revenue and a $6B 2030 target. Citrin Cooperman moved from New Mountain to a Blackstone-led group at approximately $2B valuation, announced January 2025, closed Q2 2025. Aprio took its first institutional capital from Charlesbank in July 2024, then merged in Delap LLP and Hoffman, Stewart & Schmidt of Portland effective January 2026 for Pacific Northwest entry. EisnerAmper, originally backed by TowerBrook in 2021, completed a continuation vehicle transaction with TowerBrook plus Carlyle AlpInvest and Hamilton Lane in March 2026, with 27 acquisitions since 2021 reaching $1.2B revenue. Doeren Mayhew closed an Audax investment in September 2024 under APS structure and made eight or more deals in 2025. Wipfli announced a New Mountain Capital investment in August 2025 valued above $1B, with NM at approximately 40%. PKF O’Connor Davies took an Investcorp plus PSP Investments investment in November 2024, with FY23 net revenue of $377.5M. CBIZ acquired Marcum’s non-attest practice in Q4 2024 in a $2.3B cash-and-stock deal, becoming the seventh-largest US accounting services provider. The most active roll-up platforms by 2024-2026 deal count are Ascend (Alpine Investors; 40+ acquisitions since January 2023, including KSDT of Miami as its largest deal, plus BGW of Charlotte, Tronconi Segarra of New York, BiggsKofford of Colorado Springs and Denver, Walter Shuffain of Boston, Gollob Morgan Peddy of Tyler Texas, Lucas Horsfall of Pasadena, and Wilson Lewis of Atlanta in January 2026), Sorren (DFW Capital Partners; launched May 2025 with 13 firms and reached 21 deals by early 2026 with $170M revenue and 1,000+ staff), Springline Advisory (Trinity Hunt Partners), Smith + Howard (Broad Sky Partners, Atlanta HQ), Carr Riggs & Ingram (Centerbridge plus Bessemer since November 2024, with CapinCrouse acquired January 2025 as the largest deal in the firm’s history), Armanino (Further Global, October 2024 minority), and Schellman & Co. (acquired by Goldman Sachs Alternatives from Lightyear in March 2026, with Lightyear retaining a minority). New entrants include the Madison Dearborn Partners-backed Nichols Cauley platform launched in 2026 under former Baker Tilly CEO Alan Whitman as a triple-threat CPA-plus-insurance-plus-transaction-advisory platform anchored on 200-person Nichols Cauley of Dublin, Georgia. Important corrections: BDO USA is NOT a PE acquisition — the $1.3B Apollo transaction was debt financing supporting an ESOP. Crowe LLP remains independent as of mid-2026, with a reported KKR exclusivity at $2.5-3B but no closed transaction. Withum has publicly rejected PE on a stewardship-over-ownership philosophy and remains independent.

CPA sub-verticals and how each is valued

Buyers value CPA sub-verticals on a clear hierarchy. Pure 1040 and seasonal tax prep is the lowest band at 0.8-1.0x revenue or 3-4x EBITDA, most exposed to TurboTax and AI commoditization — though PE platforms still buy these books as feeders for advisory cross-sell. Audit and assurance commands a premium at 1.0-1.4x revenue or 4-6x EBITDA, with the regulatory moat of mandatory peer review and Yellow Book / single-audit specialty firms priced above. Client Accounting Services, outsourced CFO, and advisory commands the highest multiples at 1.3-2.0x revenue or 6-9x EBITDA on premium platforms; these firms behave like SaaS-style recurring revenue businesses. Specialty work (forensic accounting, business valuation, R&D credits, multistate tax) trades at 1.0-1.8x revenue depending on book quality — forensic and litigation support carries a credentialed-expert premium, while R&D pure-plays discount post-2024 IRS scrutiny and ERC pure-plays carry a heavy discount. Wealth and RIA arms bolted into the firm are typically valued separately at 2.0-3.0x revenue or 7-10x EBITDA for the RIA piece — PE buyers prize these cross-sell engines. Government and single-audit Yellow Book specialty firms trade at 1.2-1.6x revenue with a high regulatory barrier.

Maine CPA market context

Maine is shaped by the same federal AICPA-NASBA Uniform Accountancy Act framework and the same Alternative Practice Structure model that has enabled the platform-scale PE investments in Grant Thornton, Baker Tilly / Moss Adams, Citrin Cooperman, Aprio, EisnerAmper, Doeren Mayhew, Wipfli, PKF O’Connor Davies, and CBIZ. The active roll-up platforms — Ascend (Alpine Investors), Sorren (DFW Capital Partners), Springline Advisory (Trinity Hunt Partners), Smith + Howard (Broad Sky Partners), Carr Riggs & Ingram (Centerbridge plus Bessemer), Armanino (Further Global), and Schellman & Co. (Goldman Sachs Alternatives) — routinely acquire across all 50 states under the universal majority-CPA-ownership rule and the APS structure. Regional concentration of deal flow tracks firm density rather than state-specific frameworks, with the Southeast (Georgia, Florida, Texas, North Carolina, South Carolina) accounting for approximately 20% of all PE-touched CPA transactions in 2024-2026.

State Board of Accountancy, ownership rules, and APS structure for Maine firms

CPA practice is among the most state-regulated services in US business. Three legal frameworks govern any sale of a CPA firm across state lines: state Board of Accountancy firm registration and permit (every state requires it), CPA firm ownership rules (51%+ must be held by licensed CPAs, with non-CPA outside investors capped at 49% in the licensed CPA entity, per the Uniform Accountancy Act adopted in some form by virtually every state), peer review enrollment for any firm performing attest services (typical cadence every three years), and individual CPA mobility / practice privilege for interstate work. As of mid-2026, NO US state allows non-CPAs to hold a majority of a licensed CPA firm. This is why every PE-backed accounting platform uses the Alternative Practice Structure: a licensed CPA firm entity (Aprio LLP, PKF O’Connor Davies LLP, Grant Thornton LLP, Wipfli LLP, Armanino LLP) wholly owned by CPAs performs all attest work, while a separate non-attest Advisory LLC holds the PE capital and performs tax, advisory, CAS, technology, and back-office. The two entities operate under an administrative services agreement. The single most important pending regulatory development is the AICPA Professional Ethics Executive Committee Exposure Draft on Alternative Practice Structures released December 29, 2025, with comment period closing April 30, 2026 — the most significant APS regulatory change since 2000. It introduces control versus significant-influence tests for PE investors and restricts attest services to PE-portfolio companies and upstream entities. Expect APS structures to be re-papered across the industry through 2026-2027 once it finalizes. Separately, the AICPA and NASBA UAA model update of May 2025 added a third CPA licensure pathway (120 hours plus 2 years experience) and shifted mobility from state-based to individual-based practice privilege, with 14 states having enacted the new model legislation as of mid-2026 and Ohio first in January 2025.

How this applies to a Maine CPA firm sale

A Maine firm sale to a PE-backed platform virtually always uses an Alternative Practice Structure: the Maine-licensed CPA firm entity (an LLP or PC) wholly owned by CPAs retains all attest work, while a separate Advisory LLC holds the PE capital and performs tax, advisory, CAS, technology, and back-office services. The two entities operate under an administrative services agreement. The Maine Board of Accountancy must be notified of the change of ownership and the firm permit re-registered; for multi-state firms with attest clients in other jurisdictions, each state where attest services are delivered requires its own firm permit re-registered or transferred post-close. Selling partners should plan for the AICPA Professional Ethics Executive Committee APS Exposure Draft (December 2025) to re-paper standard APS terms in 2026-2027, including control-versus-significant-influence tests for PE investors.

Deal mechanics specific to Maine CPA firm sales

Client retention earnouts of 20-40% of purchase price over a one-to-three-year measurement window are the standard CPA deal structure, with client retention measured on a revenue retention basis. The buyer-side risk that needs explicit covenant protection is cherry-picking: a buyer can run off low-margin clients deliberately to depress the seller’s earnout, so servicing covenants, attribution rules, and a defined comparator client list should be negotiated into the LPA. Partner non-competes typically run three to five years post-close with a 25-50 mile metropolitan radius and non-solicit-on-clients running five to seven years; selling partners commonly stay on as W-2 or consulting for two to five years to support client transition. PE platforms increasingly require selling partners to roll 20-40% of proceeds into platform equity for second-bite economics on the next sponsor exit (typical hold four to seven years). CPA E&O is written on a claims-made basis, so the acquirer typically does NOT assume seller’s pre-close professional liability — Extended Reporting Coverage (tail coverage) is mandatory at a typical five-to-seven-year minimum, costing 100-300% of annual premium paid upfront at closing. Working papers are CPA firm property (not client property) and convey with the firm in a sale, with retention of seven years federally (PCAOB requires seven years minimum for audit work papers under Sarbanes-Oxley). For multi-state firms, each state where attest clients are served typically requires a separate firm permit re-registered or transferred post-close.

The partner-succession crisis — why Maine owners are selling now

The partner-succession crisis is the structural driver of the 2024-2026 seller wave. The average US CPA is 52-53 years old. 65.5% of partners in $2M-$10M firms are over 50; 71.1% of partners in sole-practitioner and small firms are over 50; 75% of CPAs reached retirement eligibility by 2024 per AICPA-cited data. AICPA membership has declined from 430,000 in 2017 to roughly 415,000 today. Less than half of firms in any size range have a written succession plan. Boomer partners built firms in the 1980s and 1990s and did not plan succession; internal succession requires next-gen partners willing to buy out, but the next generation either doesn’t exist (pipeline) or doesn’t want partnership economics. PE buyers solve liquidity by writing a check today versus a ten-year internal note — which is exactly why 86 PE-touched transactions closed in 2025 and 52 closed in just January-February 2026. The 150-hour rule rollback (Ohio first in January 2025, Virginia and California effective January 2026, Texas August 2026) will only re-open the pipeline over a three-to-five-year lag, meaning 2026-2030 is the moment of maximum buyer demand.

Why a Maine CPA firm sale needs vertical-specific advice

National advisors who treat a CPA firm as a generic professional services business will miss the levers that materially move price. The revenue-mix split between tax compliance, attest, CAS, and specialty advisory; the partner-compensation add-back stack; the client-retention earnout structure and the cherry-picking covenant; the seven-year working-paper retention; the E&O claims-made tail coverage at 100-300% of annual premium; the state Board of Accountancy permit transfer; and the APS administrative services agreement mechanics are all CPA-specific diligence items. A Maine seller advised by someone who understands the 86-deal 2025 PE-touched deal map, the AICPA December 2025 APS Exposure Draft re-paper risk, and the partner-rollover second-bite economics negotiates as an equal — not as someone being educated by the buyer’s diligence team at their own expense.

The 18-24 month pre-sale playbook for Maine CPA firms

Owners who reach the top of the multiple range almost always prepared deliberately. With 12-24 months of runway, prioritize:

• Shift mix toward CAS, advisory, and outsourced CFO. A recurring CAS dollar is worth roughly 1.3-1.5x of a tax-prep dollar in the multiple. Building this book is the single highest-return move available.
• Document recurring revenue rigorously. Buyers separate quasi-recurring annual tax compliance from true recurring monthly CAS retainers. PSA / billing data that proves the monthly-retainer book gets a premium.
• Normalize partner compensation. Set working-partner pay to fair-market ($250K-$450K depending on role and region) and let the excess fall to EBITDA. Document this with payroll and K-1 detail going into diligence.
• Reduce client concentration. Get top-10 client share below 30%, top single client below 10%. PE buyers underwrite concentration with a discount.
• Build the second-tier partner bench. An owner-dependent firm discounts heavily; a firm with two or three non-owner senior managers ready to step into partner roles materially uplifts the multiple.
• Get peer review current and clean. A current pass-without-deficiency peer review is table stakes for any attest-providing firm in diligence.
• Sort out the APS structure path early. Talk to a state-board-savvy CPA attorney before going to market — the post-close LLP-vs-LLC separation is not a small structural change.
• Secure E&O tail coverage availability and cost. Tail at 5-7 year minimum, costing 100-300% of annual premium upfront at closing — price it in to the deal model before negotiating purchase price.

For the broader framework, see our lower middle market buyer mandate report and our exit multiple operator’s guide.

Common mistakes Maine CPA firm owners make when selling

• Selling a 1040-heavy, tax-season-spiky book without building recurring CAS or advisory revenue first.
• Anchoring on revenue rather than EBITDA, recurring CAS percentage, and partner-compensation-normalized cash flow.
• Failing to normalize partner compensation in the EBITDA presentation — leaving 20-40% of the deal value on the table.
• Not negotiating cherry-picking covenants and attribution rules into the client-retention earnout — PE buyers can run off low-margin clients deliberately to depress the earnout.
• Underestimating the E&O tail-coverage cost — this is a real seller cost, not a buyer cost, and surprises here can crater the net.
• Ignoring the APS structure and the AICPA December 2025 Exposure Draft — selling into a PE platform without state-board-savvy counsel is the costliest single mistake.
• Taking the first inbound offer from a single PE platform rather than running a competitive process across the 10+ active CPA consolidators.
• Treating AI as a threat rather than a margin-expansion story in the seller positioning narrative — PE platforms are paying premium multiples on the bullish AI-margin thesis.

Sell a CPA Firm: Maine and beyond

Companion guides:

• Sell a CPA Firm (national overview)
• The lower middle market buyer mandate report
• Exit multiple: the 2026 operator’s guide
• Private Equity in Managed IT Services 2026 (comparable services roll-up)
• IT Services Valuation Multiples (comparable framework)

Maine CPA firm sale: 2026 outlook and key takeaways

CPA firm M&A is the freshest hot roll-up in US services, with 86 PE-touched transactions in 2025 and 52 transactions in just the first two months of 2026, 10+ active PE-backed platforms acquiring across the country, and the partner-succession crisis (75% of US CPAs retirement-eligible by 2024) providing a structural seller wave. A Maine firm with a recurring CAS book above 30% of revenue, retention above 90%, normalized partner compensation documented in EBITDA, a second-tier partner bench, current pass-without-deficiency peer review, and clean APS-ready entity structuring can realistically reach the upper end of its valuation tier. The issues that most often cost sellers money are pure-1040 revenue mix, un-normalized partner draws, undisclosed peer-review deficiencies, and accepting the first inbound platform offer rather than running a confidential process across the full active buyer pool.

This guide reflects 2026 CPA firm M&A market conditions and CT Acquisitions’ direct work with active acquirers. Multiples are directional, not a guarantee; every firm is underwritten on its own revenue mix, recurring revenue percentage, partner-compensation normalization, client concentration, and growth profile. State Board of Accountancy ownership rules, peer review requirements, and the AICPA Professional Ethics Executive Committee Alternative Practice Structure Exposure Draft (December 2025, comment period closing April 30, 2026) are in active transition — confirm current requirements with qualified counsel and the relevant state board before relying on them in a transaction.

Maine CPA firm sale: frequently asked questions