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Deal Structure Guide · CPA Firm (Business Tax Focus)

How to Structure a CPA Firm Acquisition That Protects Both Buyer and Seller

From SBA 7(a) financing to revenue-based earnouts, learn the deal structures that work for business-focused accounting practices in the $1M–$5M revenue range — and how to negotiate terms that survive client transition.

Acquiring a business-focused CPA firm is fundamentally different from buying a product-based or asset-heavy business. The core asset — the client relationships — walks out the door every April. That reality shapes every aspect of how these deals are structured. Buyers need downside protection against client attrition; sellers need fair compensation for decades of relationship-building. The deal structures used in CPA firm acquisitions reflect this tension directly. Most transactions in the lower middle market combine SBA 7(a) financing for the majority of the purchase price, a seller carry note that ties a portion of proceeds to client retention, and an earnout mechanism that adjusts final consideration based on actual post-close revenue. Valuations typically range from 0.9x to 1.4x gross revenue — with the higher end reserved for firms with diversified business entity clients, 90%+ retention history, credentialed staff in place, and systematized workflows that reduce owner dependency. Understanding which structure fits your situation depends on the firm's client concentration, the seller's transition willingness, staff retention risk, and how much of the purchase price can be supported by SBA-eligible collateral and cash flow.

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SBA 7(a) Loan with Seller Note

The most common structure for CPA firm acquisitions under $5M in revenue. The buyer secures an SBA 7(a) loan covering 70–80% of the purchase price, injects 10–20% equity, and the seller carries a subordinated note for the remaining gap — typically 10–20% of the total deal value. The seller note is often structured with a standby period during the SBA loan term, meaning the seller receives interest-only or deferred payments until the SBA loan is retired or the lender approves full debt service.

SBA loan: 70–80% | Buyer equity: 10–20% | Seller note: 10–20%

Pros

  • Allows buyers to acquire high-quality practices with limited upfront capital, preserving working capital for operations and transition costs
  • SBA lenders familiar with accounting firm acquisitions will underwrite on SDE cash flow rather than hard asset collateral, making approval achievable for cash-flow-positive practices
  • Seller note aligns seller incentives to support a smooth client transition since repayment depends on business continuity

Cons

  • SBA underwriting requires a full personal financial review, business plan, and often a 90-day or longer approval timeline that can slow deal execution
  • Seller note may need to be on full standby during the SBA loan term, delaying seller liquidity for years
  • Lenders may require a real estate component or additional collateral if the practice's goodwill-heavy balance sheet doesn't satisfy loan-to-value requirements

Best for: First-time CPA firm buyers acquiring a sole practitioner practice with $300K–$700K in SDE, where the seller is willing to carry 10–20% of the purchase price and stay 12–24 months for transition.

Revenue-Based Earnout

A portion of the purchase price — typically 20–35% — is paid out over 2–3 years post-close, contingent on the acquired firm retaining a defined threshold of its trailing revenue. Earnout triggers are usually set at 80–90% of the trailing twelve-month gross revenue from business tax and compliance clients. If the firm retains above the threshold, the seller receives full earnout payments. If retention falls below, earnout payments are reduced proportionally or withheld entirely. This structure is especially prevalent when the selling owner has been the primary client contact with limited staff relationship depth.

Upfront at close: 65–80% | Earnout over 24–36 months: 20–35%

Pros

  • Directly ties seller compensation to the most critical post-close risk — client attrition — creating shared accountability for a successful transition
  • Gives buyers meaningful downside protection in the first 24 months when client relationship transfer is most vulnerable
  • Motivates sellers to actively introduce buyers to clients, participate in transition meetings, and support staff retention efforts

Cons

  • Earnout disputes are common in professional services if retention measurement methodology, revenue attribution, and measurement periods are not precisely defined in the purchase agreement
  • Sellers may feel undercompensated if client attrition occurs for reasons outside their control, such as a key staff departure or economic downturn
  • Complicates financial planning for the seller, who cannot forecast total exit proceeds with certainty at closing

Best for: Practices where the selling owner handles the majority of client communication directly, client concentration risk is elevated, or a single client represents more than 10% of revenue — making post-close retention genuinely uncertain.

Full Seller Carry Note

Less common but used in partner-to-partner or internal succession transactions, this structure involves the seller financing the entire purchase price through a promissory note repaid from firm cash flow over 5–7 years. The buyer makes monthly or quarterly principal and interest payments directly to the seller, often at 6–8% interest. This eliminates bank financing and its associated underwriting requirements but requires the seller to accept installment-based liquidity rather than a lump sum at close.

Seller note: 100% of purchase price | Repaid over 5–7 years at 6–8% interest

Pros

  • Eliminates SBA approval timelines and bank underwriting requirements, allowing transactions to close in 30–60 days
  • Gives the seller favorable installment sale tax treatment, spreading capital gains recognition over the note term and potentially reducing total tax liability
  • Signals strong seller confidence in the buyer and the transferability of the client base, which can be a positive negotiating signal

Cons

  • Seller takes on full credit risk — if the buyer cannot generate sufficient cash flow from the practice, the seller has limited recourse beyond the firm's goodwill
  • No bank oversight or third-party structure means deal terms, default remedies, and collateral arrangements must be meticulously documented in the promissory note
  • Buyer may struggle to refinance or obtain growth capital later if the seller note creates a senior lien on the practice's assets

Best for: Internal succession transactions where a senior associate or junior partner is buying out a retiring owner, or where the seller has high confidence in the buyer's technical competence and existing client relationships within the firm.

Sample Deal Structures

Sole Practitioner Tax Firm — First-Time Buyer Using SBA Financing

$1,200,000

SBA 7(a) loan: $840,000 (70%) | Buyer equity injection: $180,000 (15%) | Seller carry note: $180,000 (15%)

SBA loan at prime + 2.75% over 10 years; seller note at 6% interest with 24-month standby period, then 36 months of principal and interest payments. Seller remains as a W-2 consultant for 18 months at $80,000 annually to support client transition. Non-compete covering 25-mile radius for 5 years post-close.

Two-Partner Business Tax Firm with Client Concentration Risk — Earnout Structure

$2,800,000

Cash at close: $1,960,000 (70%) funded via SBA 7(a) loan and buyer equity | Revenue-based earnout: $840,000 (30%) paid quarterly over 36 months tied to retaining 85% of trailing $2M gross revenue from business entity clients

Earnout payments calculated quarterly on actual billed revenue versus trailing 12-month baseline. Payments reduced dollar-for-dollar if retention drops below 85%; earnout fully preserved if retention exceeds 90%. Sellers remain as part-time consultants at $50,000 per year for 24 months. Seller non-solicitation agreement for clients and staff covering 5 years.

Regional Firm Roll-Up Acquisition — Clean Practice with Recurring Revenue

$4,500,000

Cash at close: $3,600,000 (80%) funded via acquirer's credit facility | Seller carry note: $900,000 (20%) over 5 years at 6.5%

No earnout given 95% client retention history over trailing 5 years and licensed staff with non-solicitation agreements in place. Seller note secured by firm goodwill and receivables. Selling partner retained as of-counsel tax advisor at $120,000 annually for 12 months. Employment agreements offered to all three credentialed CPAs on staff at close.

Negotiation Tips for CPA Firm (Business Tax Focus) Deals

  • 1Define earnout measurement methodology in precise contractual language before LOI execution — specify which revenue streams count, how billing disputes are handled, and what happens if the buyer reprices or terminates a client relationship post-close, to prevent disputes that derail closings
  • 2Negotiate seller transition length and compensation as a separate line item from the purchase price — a seller who stays engaged for 18–24 months at a reasonable consulting fee is worth far more than a higher headline price with a 90-day handoff
  • 3Request a client-by-client revenue reconciliation for the trailing 3 years, not just aggregate revenue figures — concentration risk and declining relationships are invisible in top-line numbers and become the buyer's problem post-close
  • 4Tie the seller note subordination terms to specific retention milestones rather than accepting a blanket standby period — this gives the seller a pathway to earlier liquidity while keeping downside protection intact for the SBA lender
  • 5Insist on estoppel-style written confirmation from the top 10 clients representing the highest revenue concentration before closing — verbal assurances from the seller about client loyalty are not bankable; direct client communication is
  • 6Negotiate staff non-solicitation and confidentiality agreements as a closing condition, not a post-close request — key staff who have not signed these agreements represent an unquantified attrition risk that should be resolved before funds transfer

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Frequently Asked Questions

What is the typical purchase price multiple for a business-focused CPA firm?

Business tax CPA firms in the lower middle market typically sell for 0.9x to 1.4x gross annual revenue. The lower end of that range applies to firms with client concentration issues, declining revenue trends, heavy owner dependency in client relationships, or outdated technology. The higher end is reserved for firms with diversified business entity clients — S-corps, C-corps, and partnerships — strong multi-year retention history above 90%, credentialed staff who are likely to stay, and systematized workflows that reduce transition risk. Earnings-based buyers will also look at 3x–5x SDE or EBITDA as a secondary check, particularly when SBA lenders need to verify debt service coverage.

How does an earnout work in a CPA firm acquisition and how long does it typically last?

In a CPA firm acquisition, an earnout is a deferred portion of the purchase price — typically 20–35% — paid to the seller over 2–3 years based on whether the firm retains a defined percentage of its pre-close gross revenue, usually 80–90%. Payments are made quarterly or annually and are reduced proportionally if retention falls below the agreed threshold. For example, if the baseline is $1.5M in trailing revenue and the earnout threshold is 85%, the seller receives full earnout payments only if the acquired firm bills at least $1.275M in the measurement period. Earnouts are most appropriate when the selling owner has been the primary client contact and client transfer risk is genuinely elevated.

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

Yes. CPA firms are SBA-eligible businesses, and SBA 7(a) loans are the most common financing vehicle for lower middle market accounting practice acquisitions. Lenders will underwrite based on the practice's seller's discretionary earnings or EBITDA rather than hard assets, since goodwill represents the majority of value. Typical requirements include a 10–20% equity injection from the buyer, a personal guarantee, a business plan demonstrating post-acquisition cash flow, and often a seller note representing 10–20% of the purchase price on standby. SBA loans for professional service acquisitions can take 60–120 days to close, so buyers should engage an SBA-experienced lender early in the process.

What happens if clients leave after I buy the CPA firm?

Client attrition is the central post-close risk in any CPA firm acquisition, and deal structures are specifically designed to allocate that risk between buyer and seller. If you have an earnout clause, payments to the seller are reduced proportionally to the revenue lost. If you negotiated a seller carry note with retention contingencies, you may have contractual grounds to reduce or suspend payments depending on how the note is drafted. The best protection, however, is pre-close due diligence: review retention history by client over trailing 3 years, ensure the seller introduces you personally to the top 20 clients before closing, and confirm that key staff with client relationships have signed non-solicitation agreements. No legal structure fully compensates for losing 30% of a firm's revenue in year one.

Should I structure the deal as an asset purchase or stock purchase?

The large majority of CPA firm acquisitions in the lower middle market are structured as asset purchases. This gives the buyer a stepped-up cost basis in the acquired goodwill, which is amortizable over 15 years for tax purposes under IRC Section 197, and protects the buyer from inheriting unknown liabilities including malpractice claims, state board complaints, or unresolved IRS representation issues in the seller's history. Stock purchases are occasionally used in roll-up transactions where the acquirer wants to preserve existing client contracts, state registrations, or banking relationships without re-papering assignments — but they come with the seller's full liability history attached. Always have M&A legal counsel experienced in professional service firm transactions review the structure before finalizing the LOI.

How long should the seller stay involved after the sale closes?

For a sole practitioner CPA firm where the owner has been the primary client contact, a 12–24 month transition period is standard and often required by SBA lenders as a condition of approval. This transition is typically structured as a paid consulting arrangement at a separate compensation rate — often $60,000–$120,000 annually — distinct from the purchase price. During this period the seller makes warm introductions to clients, co-signs client communications, and supports staff integration. For larger two- to three-partner firms with existing staff depth and established client relationships at the staff level, a 6–12 month transition may be sufficient. Shorter transitions create higher client attrition risk and typically result in lower purchase price multiples or larger earnout components to compensate the buyer.

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