Due Diligence Guide · Accounting/CPA Firm

Due Diligence Guide for Acquiring a CPA Firm

Before you wire funds on an accounting practice, verify client stickiness, staff credentials, and recurring revenue quality — the three factors that determine whether your acquisition retains its value post-close.

Find Accounting/CPA Firm Acquisition Targets

Acquiring a CPA or accounting firm in the $1M–$5M revenue range requires disciplined due diligence across client relationships, staff depth, and revenue quality. Unlike asset-heavy businesses, value here walks out the door every April 16th. This guide helps buyers systematically evaluate the risks that most commonly destroy post-acquisition returns in accounting practice deals.

Accounting/CPA Firm Due Diligence Phases

01

Phase 1: Financial and Revenue Quality Review

Validate the sustainability and composition of reported revenue before proceeding to LOI or purchase price finalization.

Three-Year Revenue and EBITDA Trend Analysiscritical

Review compiled or reviewed financials and tax returns for three years. Identify any one-time engagements, fee spikes, or revenue that will not recur post-acquisition.

Recurring vs. One-Time Revenue Breakdowncritical

Segment revenue into recurring retainer or annual compliance engagements versus project-based or one-time advisory fees. Recurring revenue above 70% justifies higher multiples.

Billing Rate Benchmarking by Service Lineimportant

Compare per-hour or per-engagement billing rates for tax, bookkeeping, and advisory against regional market norms to assess pricing power and potential upside.

02

Phase 2: Client Base and Concentration Analysis

Assess client stickiness, concentration risk, and attrition likelihood once the founding CPA transitions out of the business.

Client Revenue Concentration Reportcritical

Request a full client roster with revenue by client, service type, and tenure. Flag any practice where the top five clients exceed 40% of total revenue as a concentration risk.

Engagement Letter and Contract Auditcritical

Confirm every active client has a signed engagement letter with current fee schedules. Verbal agreements or expired contracts represent significant attrition and legal risk post-close.

Founding CPA Client Relationship Mappingimportant

Identify which clients are relationship-dependent on the selling CPA versus staff CPAs. Require warm introductions and structured transition before earnout period begins.

03

Phase 3: Staff, Compliance, and Technology Review

Verify staff credentials, identify legal or regulatory exposure, and evaluate whether the technology infrastructure supports post-acquisition operations.

Staff CPA License and Non-Solicitation Verificationcritical

Confirm active CPA licensure for all credentialed staff through state board records. Review employment agreements for non-solicitation clauses protecting clients and staff post-close.

IRS Complaints, Malpractice, and State Board Claimscritical

Search for pending or historical IRS preparer penalties, malpractice claims, or state board disciplinary actions against the firm or any licensed staff member.

Practice Management and Tax Software Stackimportant

Evaluate current platforms such as Thomson Reuters, CCH, or QuickBooks Online. Assess migration complexity, licensing transferability, and workflow documentation completeness.

Accounting/CPA Firm-Specific Due Diligence Items

  • Verify that seasonal revenue concentration does not exceed 60% in Q1; heavy tax-season dependency reduces year-round cash flow predictability and increases staffing risk.
  • Confirm no single client exceeds 10–15% of total billings; high concentration makes earnout structures difficult to negotiate and post-close revenue unpredictable.
  • Request staff retention history for the past three years; turnover above 25% annually signals compensation misalignment or culture issues that typically worsen post-acquisition.
  • Audit aged receivables for invoices over 90 days; accounting firms with poor internal collections often signal billing disputes or informal fee arrangements not reflected in reported revenue.
  • Assess whether the selling CPA is willing to commit to a 12–24 month transition; without structured handoff, client attrition in year one can materially impair earnout performance.

Frequently Asked Questions

What is a typical valuation multiple for a CPA firm in the lower middle market?

Most accounting practices with $1M–$5M revenue sell at 0.9x to 1.4x gross revenue, with higher multiples awarded for strong recurring revenue, staff depth, and a diversified client base with no concentration risk.

How should an earnout be structured when acquiring an accounting practice?

Tie the earnout to client revenue retention over 12–24 months post-close. A common structure pays 70–80% at close with the balance contingent on retaining a defined percentage of trailing twelve-month billings.

Can I use an SBA 7(a) loan to acquire a CPA firm?

Yes. CPA firms are SBA-eligible businesses. Most deals are structured with SBA 7(a) financing covering 80–90% of the purchase price, a seller note for the remainder, and an earnout tied to post-close client retention.

What is the biggest risk when buying an accounting firm with a retiring founder?

Client attrition tied to founder departure is the primary risk. If the selling CPA holds all key relationships and exits immediately, expect 20–35% client revenue loss. Require a structured 12–24 month transition as a deal condition.

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