1.1Industry

Accounting, Tax & Audit

CPA firms, tax advisors, and audit practices providing financial reporting, compliance, and tax planning services to businesses and high-net-worth individuals.

7
Segments
36
Verticals

Overview

Accounting, Tax & Audit covers the firms that keep companies compliant and financially legible — CPA practices, tax preparers and advisors, payroll processors, and outsourced finance-and-accounting providers. The work splits into four economic engines: assurance (independent audits and reviews), tax (compliance plus higher-value advisory), payroll, and day-to-day bookkeeping and F&A outsourcing.

The industry is overwhelmingly a profession of small partnerships and independent shops, with a thin layer of national brands and the Big Four at the top of the audit market. Revenue blends recurring annual cycles (tax season, audit engagements, monthly close) with project advisory, which makes books predictable but tightly bound to professional labor and partner capacity.

Market snapshot

Market size
~$209B
Growth
~6.5%CAGR (2017–22, nominal)
Companies
~136,000
FragmentationHighly fragmented

U.S. Census Bureau — 2022 County Business Patterns (establishments) + 2017/2022 Economic Census (receipts), NAICS 541211/541213/541214/541219.

Business model & economics

Revenue model
Fee-for-service plus recurring compliance and retainer work
Recurring revenue
Moderate–High — annual tax and audit cycles, monthly bookkeeping and payroll
EBITDA margin
15–30% (owner-comp adjusted)
Capex intensity
Low
  • People-driven economics — capacity and margin track billable professional headcount.
  • Recurring compliance work anchors retention; advisory carries the premium pricing.
  • Licensure, peer review, and regulatory barriers limit who can sign opinions.

Geographic concentration

Demand follows business formation and population, so firms cluster in the largest metros, with outsized share in low-tax, in-migration states that have absorbed corporate and household relocation.

CaliforniaFloridaTexasNew YorkIllinois

M&A deal context

High deal activity

Who’s acquiring

PE-backed accounting platformsRegional firm roll-upsPayroll & fintech strategics

What’s driving deals

  • Private equity entering CPA firms in force since 2021 via alternative practice structures.
  • Partner succession and a shrinking CPA pipeline forcing sales and mergers.
  • Automation and offshoring shifting mix from commodity compliance to advisory.
  • Platforms cross-selling tax, audit, payroll, and F&A across an acquired client base.

Segment classifications

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