Why You Need a CPA for Business Acquisition Due Diligence

What a CPA Actually Does in Business Acquisition Due Diligence

An acquisition CPA isn't doing tax prep. They're doing forensic financial analysis — taking the seller's financials apart and rebuilding them from the ground up to answer one question: How much does this business actually earn?

The formal deliverable is called a Quality of Earnings (QoE) report. It typically covers:

**Revenue verification.** Comparing bank deposits to P&L revenue line by line, looking for gaps, one-time revenue events, or revenue that was pulled forward from future periods.

**Add-back verification.** The broker's recast financial shows the seller's claimed add-backs — owner salary, personal expenses, one-time items. The CPA verifies each add-back is legitimate and quantifies any that were overstated.

**Expense normalization.** Are there owner-related expenses that will continue post-acquisition? Are there expenses that are understated because the seller deferred maintenance or skipped vendor payments?

**Working capital analysis.** What level of working capital does the business actually need to operate, and what will be left at closing versus what's needed to avoid a liquidity crunch?

The Quality of Earnings Analysis: What It Finds

In the majority of acquisitions, a thorough quality of earnings review finds meaningful adjustments to the seller's stated numbers. Not always fraud — often just legitimate differences in how the seller presents their finances versus how a buyer needs to understand them.

Common findings in a QoE review:

**Revenue concentration.** Revenue from a single customer or contract that expires within 12 months of closing. This isn't fraud — the broker may not have flagged it prominently — but it materially affects what the business is worth.

**Inflated add-backs.** The seller claims $80K in "personal" expenses as an add-back to SDE. The CPA finds $30K of that was actually business-critical vendor payments the seller routed personally. The adjusted add-back is $50K, reducing SDE by $30K.

**Revenue timing.** The seller billed $200K in contracts in December to pump year-end revenue. In an accrual-basis review, that revenue belongs in the future period. Trailing twelve-month revenue is actually $200K lower than reported.

**Missing expenses.** The seller hasn't replaced equipment in 5 years, inflating net income by avoiding depreciation and capital expenditures that a new owner will need to make in year 1.

Tax Return Analysis: Why 3 Years Matters

Tax returns are more trustworthy than broker-prepared P&Ls because owners generally don't inflate revenue on their taxes. The IRS is a stronger motivator for accuracy than a buyer.

The CPA will review 3 years of federal returns and reconcile them against the broker's recast. Key things they're looking for:

**Revenue trend.** Is the business growing, flat, or declining? Three years shows a trend. One year of strong numbers after two weak ones may indicate a one-time revenue event, not a turnaround.

**Expense consistency.** If officer compensation (your add-back) is $120K in 2024 but $80K in 2022 and 2023, why? Was it manipulated in the final year to inflate SDE for the sale?

**Tax method.** Cash vs. accrual accounting changes how and when revenue and expenses are recognized. Comparing across years requires consistency. Switching accounting methods in year 3 of ownership — common when preparing for sale — should be flagged.

**Schedule K-1 distributions.** For an S-corp or partnership, the K-1 shows distributions that may not appear in the P&L. These reduce working capital and need to be normalized.

What a CPA Engagement Costs and What You Get

For a business acquisition below $2M in purchase price, a thorough CPA due diligence engagement typically costs $5K–$10K. For deals in the $2M–$5M range, expect $10K–$20K for a full quality of earnings report. Larger deals command more.

What you receive: - Written QoE report with findings and adjusted earnings calculations - Working capital analysis and target working capital recommendation - Tax return analysis summary - List of material concerns or deal risks - Oral consultation on findings and deal implications

The CPA fee is almost always worth it. A $7K QoE that finds $80K in inflated add-backs saves you $240K in purchase price (at 3x SDE multiple) or tells you the deal isn't worth pursuing. Either outcome is worth $7K.

Make sure the CPA has specific experience with business acquisitions — not just tax preparation. A general accounting firm may not know what a quality of earnings analysis is. Ask for their last 5 acquisition engagements before hiring them.

When to Bring the CPA In (And When It's Too Late)

The CPA should be engaged immediately after you sign the LOI and enter exclusivity. The exclusivity period (typically 30–45 days) is your diligence window. Start the CPA engagement on day 1 of that window, not day 15.

The seller needs to provide financial documents immediately: 3 years of tax returns, 3 years of P&Ls, 12 months of bank statements, accounts receivable aging, accounts payable aging, and the list of add-backs the broker is claiming. Some sellers resist providing all of this. That resistance is itself a due diligence finding.

Don't bring the CPA in too early (before LOI) — you'll pay for a review on a deal that doesn't achieve exclusivity. Don't bring them in too late (after you've already committed to a price adjustment) — you lose the leverage their findings provide.

Deal Flow OS helps you find acquisition targets, analyze deals, and move to LOI faster so you're not wasting due diligence fees on deals that never get to exclusivity.

• Engage CPA on day 1 of exclusivity — not partway through
• Request all financial documents before CPA engagement begins
• Budget for QoE: $5K–$10K under $2M, $10K–$20K for larger deals
• Verify CPA has acquisition experience (ask for prior QoE samples)
• Use CPA findings to reprice or exit — not just to document