Recent Accounting & Tax Acquisitions in Michigan
Acquisition Volume in Accounting & Tax in Michigan by Year
Last 5 years
Deal activity in Accounting & Tax across Michigan (2022–2025) centers on firms expanding core client services—especially tax, assurance, and advisory—while adding local office presence in markets like Grand Haven, Grand Rapids, Detroit, and the broader state footprint.
Across these transactions, recurring buyers include established national and platform operators such as Doeren Mayhew, Marcum LLP, B. Riley Financial, Inc., IRIS Software Group, and accounting-services platforms like Prosperity Partners (backed by Unity Partners) and E78 Partners (with Further Global). A notable pattern is the combination of accounting/tax capability expansion with talent and office integration after closing.
Several deals also broaden specialization beyond traditional compliance. B. Riley Financial, Inc. moved into dedicated Litigation Support and Forensic Accounting in Detroit via the acquisition of Crawford & Winiarski, while E78 Partners added interim CFO/FP&A and post-merger integration services through Outliers LLC. IRIS Software Group further expanded CPA-focused payroll and tax processing capabilities by acquiring Thomson Reuters myPay Solutions.
What Stands Out
- Doeren Mayhew repeatedly expands West Michigan presence while deepening tax and audit/assurance capabilities through CPAs integration (e.g., Novotny CPA Group, Benoit & Associates, CPAs).
- Platform-backed acquirers focus on building regional scale and adding complementary services such as tax, valuation, outsourced accounting, and client-facing accounting operations (e.g., Prosperity Partners and Unity Partners backing).
- Specialty capability expansion shows up in forensic accounting and litigation support (via B. Riley Financial, Inc. acquiring Crawford & Winiarski) and transaction services like interim CFO/FP&A and integration support (via E78 Partners acquiring Outliers LLC).
- Technology-enabled service scope appears with IRIS Software Group’s acquisition of Thomson Reuters myPay Solutions, adding outsourced payroll and related reporting for CPA firms and their SMB clients.
| Buyer (recurring) | Common deal direction seen in Michigan |
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November 6, 2025
- Buyer
- Doeren Mayhew
- Target
- Novotny CPA Group
- Industry
- Accounting & Tax
- Location
- Michigan, United States
- Type
- Buyout
Doeren Mayhew, a national assurance, tax and advisory firm, has acquired Novotny CPA Group, expanding its West Michigan presence. The integration strengthens Doeren Mayhew’s tax and audit capabilities while bringing Novotny partners and staff into Doeren Mayhew’s Grand Haven and Grand Rapids offices.
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June 9, 2025
- Buyer
- Doeren Mayhew
- Target
- Benoit & Associates, CPAs
- Industry
- Accounting & Tax
- Location
- Michigan, United States
- Type
- Buyout
Doeren Mayhew, a national assurance, tax and advisory firm, has acquired Grand Rapids-based Benoit & Associates, CPAs, effective June 1, 2025. The deal deepens Doeren Mayhew's tax capabilities and expands its presence in West Michigan; Maurice Benoit joined Doeren Mayhew as a principal and relocated with his staff to the firm's downtown Grand Rapids office.
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September 18, 2024
- Buyer
- Prosperity Partners, Unity Partners
- Target
- Cendrowski Corporate Advisors (CCA)
- Industry
- Accounting & Tax
- Location
- Michigan, United States
- Type
- Addon
Prosperity Partners, a Chicago-headquartered accounting platform backed by Unity Partners, has completed the acquisition of Detroit-area tax and accounting firm Cendrowski Corporate Advisors (CCA). The add-on expands Prosperity's tax, valuation and outsourced accounting capabilities and establishes a local presence in the Detroit/Bloomfield Hills market; terms were not disclosed.
-
May 1, 2024
- Buyer
- Marcum LLP
- Target
- Croskey Lanni, PC
- Industry
- Accounting & Tax
- Location
- Michigan, United States
- Type
- Buyout
Marcum LLP has acquired Croskey Lanni, PC, a Detroit-area accounting firm with an office in Boca Raton, Florida, effective May 1, 2024. The deal brings six partners and more than 50 associates to Marcum, expanding its Midwest presence and bolstering tax, assurance, technology, and financial advisory capabilities.
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July 11, 2023
- Buyer
- B. Riley Financial, Inc.
- Target
- Crawford & Winiarski
- Industry
- Accounting & Tax
- Location
- Michigan, United States
- Type
- Buyout
B. Riley Financial acquired Crawford & Winiarski, a Detroit-based boutique forensic accounting and litigation consulting firm, and integrated the team into B. Riley Advisory Services to establish a dedicated Litigation Support and Forensic Accounting practice in Detroit. The deal expands B. Riley’s financial consulting capabilities, particularly in forensic accounting, litigation support and automotive-industry expertise; financial terms were not disclosed.
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June 12, 2023
- Buyer
- E78 Partners, Further Global
- Target
- Outliers LLC
- Industry
- Accounting & Tax
- Location
- Michigan, United States
- Type
- Addon
E78 Partners has acquired Outliers LLC, a Michigan-based finance and accounting firm that provides interim CFO, FP&A, post-merger integration and turnaround services for private equity portfolio companies. Outliers will join E78's Leadership & Transaction Services business unit to expand E78's capabilities for servicing middle-market PE-backed companies; the deal was backed by E78's sponsor, Further Global. Terms were not disclosed.
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October 26, 2022
- Buyer
- IRIS Software Group
- Target
- myPay Solutions (Thomson Reuters myPay Solutions)
- Seller
- Thomson Reuters
- Industry
- Accounting & Tax
- Location
- Michigan, United States
- Type
- Divestiture
IRIS Software Group has acquired Thomson Reuters myPay Solutions to expand its CPA-focused payroll and tax services in the Americas. The deal adds outsourced payroll processing, banking and tax reporting capabilities—serving CPA firms and their SMB clients across the United States—to IRIS' existing accountancy and payroll portfolio.
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Frequently Asked Questions
Which firms are most active in Michigan accounting & tax acquisitions (2022–2025)?
Recurring buyers in Michigan include Doeren Mayhew, Prosperity Partners (with Unity Partners), E78 Partners (with Further Global), IRIS Software Group, Marcum LLP, Unity Partners-backed activity, B. Riley Financial, Inc., and Further Global-backed activity.
What types of services do acquirers tend to add in Michigan?
Common themes include expanding tax capabilities and assurance/accounting, along with additional capabilities such as valuation and outsourced accounting, forensic accounting/litigation support, interim CFO/FP&A and post-merger integration, and CPA-focused payroll processing.
Are these Michigan deals limited to local CPA firms only?
No. The list includes acquisitions by both Michigan-based/local firms and national or platform operators (for example, IRIS Software Group and Marcum LLP) that add capabilities and local presence through office and talent integration.
What locations within Michigan show up most often in these transactions?
The transactions reference Michigan broadly and highlight markets including Detroit (and the surrounding area), Grand Rapids, and West Michigan office locations such as Grand Haven.