Accounting and Tax Practice Valuation: What CPA Firms Actually Sell For
Solo and small CPA practices are usually priced differently than almost any other Main Street business: as a multiple of annual gross revenue rather than SDE. That convention holds at the very small end, but it breaks down fast as firms scale. Once a practice moves into the $500K-$2M revenue band, most brokers and buyers quote it as 4.0x-6.0x SDE. Above roughly $2M, the market flips again to adjusted EBITDA, and above $10M the buyer pool is dominated by private-equity-backed platforms paying multiples that would look absurd on a solo practice.
How the Market Actually Splits by Size
| Firm size | Typical multiple | Metric used |
|---|---|---|
| Under $500K revenue | 0.9x - 1.3x | Annual revenue (≈3.5x-5.5x SDE) |
| $500K - $2M revenue | 1.0x - 1.4x | Annual revenue (≈4.0x-6.0x SDE) |
| $2M - $10M revenue | 5.5x - 8.5x | Adjusted EBITDA |
The bookkeeping-only segment sits a step below straight CPA/tax work: firms that mostly do write-up and bookkeeping tend to transact at roughly 2.5x-3.3x SDE (3.5x-4.6x EBITDA equivalent), reflecting thinner margins and lower barriers to entry compared to firms that also handle tax planning and attest work. BizBuySell's 2025 closed-transaction data for the accounting and tax category shows the average earnings multiple rising to 2.34x SDE and the median sale price reaching $500,000, both above the trailing five-year average, which tells you the whole segment firmed up in 2025 rather than just the PE-backed tier.
Why the Multiple Convention Flips at Scale
At the solo and small-firm level, staffing choices distort SDE too much to be reliable. One owner works 60 hours a week and pays themselves nothing extra; another draws a market-rate salary and adds it back. Revenue is the more stable number because a buyer can reasonably model retained billings independent of how the seller ran payroll. Once a firm has multiple partners, an office manager, and standardized engagement pricing, SDE becomes a cleaner signal of actual cash generation, so the market shifts to it — and eventually to EBITDA once non-owner overhead (rent, benefits, software licensing across multiple offices) becomes material enough that "seller discretion" stops being the dominant adjustment.
Buyers should still sanity-check a revenue-multiple deal against implied SDE. A firm priced at 1.1x on $500,000 in billings costs $550,000. If SDE is $220,000, that's 2.5x SDE — comfortably financeable. If the seller has been running thin margins and SDE is only $90,000, the same headline multiple implies 6.1x SDE, a level that will strain SBA debt service even with a strong retention track record.
What Pushes the Multiple Up
- Advisory and CFO-level work as a share of revenue: firms doing forward-looking planning and financial modeling, not just compliance, retain clients longer and support the top of the range.
- Recurring monthly engagements: bookkeeping retainers and outsourced-controller contracts smooth the January-April tax season spike and reduce revenue volatility.
- Younger client base: a book skewing under 55 signals a longer runway before natural attrition from client retirement or business closure.
- Multiple staff who can run engagements without the owner: reduces key-person risk that would otherwise drag on the retention guarantee.
What Pulls the Multiple Down
- Revenue concentrated in tax-season 1040 prep with little off-season work
- Aging client base nearing retirement or business wind-down
- Owner is the sole preparer with signing authority and no succession staff
- Below-market fee structure that hasn't been repriced in years
Deal Structure: The Retention Holdback
Nearly every accounting practice sale ties part of the price to actual client retention, typically measured over 12-24 months post-close. If the contract calls for $550,000 at a 95% retention benchmark and only 85% of billings stick, the buyer pays a proportionally reduced amount — often via an adjusted note rather than clawing back cash already paid. This protects the buyer from the single biggest risk in the category: a book of business that looks stable on paper but walks when a new face shows up doing the returns.
Worked Example: The Retention Discount Test
A firm asks $520,000 for a practice billing $460,000 a year (1.13x revenue), with 55% bookkeeping/advisory and 45% tax prep, three staff, and a client base averaging 52 years old. SDE runs $205,000, implying a 2.5x SDE multiple at the full asking price — reasonable for this profile. Before agreeing to terms, the buyer models a retention holdback: if the deal pays 70% at close and 30% over 18 months contingent on 90% revenue retention, and actual retention comes in at 82%, the buyer's real purchase price drops to roughly $483,000, or 1.05x revenue — a better outcome than the sticker price suggested. Running both scenarios through the AcquireCalc calculator shows how the holdback structure changes debt service coverage even if headline price doesn't move.
Common Deal Structures in This Industry
SBA 7(a) financing is standard for practices under $5M in enterprise value, usually alongside a seller note covering 10-20% of price that doubles as a retention guarantee — if clients leave, the note gets adjusted downward. Larger firms selling to PE-backed platforms use a cash-plus-rollover-equity structure instead, where the selling partner keeps 10-30% equity in the acquiring platform and earns out the balance over 3-5 years tied to firm-wide performance, not just their own book.
Frequently Asked Questions
Why do accounting practices sell for a multiple of revenue instead of SDE? Below roughly $2M in revenue, buyers and brokers in the profession default to a revenue multiple because staffing and owner compensation choices vary so much from firm to firm that SDE is a noisy number. A revenue multiple is really a proxy for expected retained billings after transition. Above about $2M, and especially at private-equity-backed platforms, buyers switch to adjusted EBITDA because at that scale margin structure becomes the real driver of value.
How much does client attrition actually cost the buyer? A well-run firm typically retains 85-95% of billings through an ownership transition. Below 80% retention, most deals fall outside normal risk tolerance for SBA lenders, which is why almost every practice sale ties some portion of price to actual retained revenue rather than paying the full amount at closing.
Does PE roll-up activity change what a solo practice is worth? Indirectly. Private-equity-backed platforms have been consolidating firms with $2M-$10M in revenue at 5.5x-8.5x adjusted EBITDA, which pulls up pricing expectations across the market. But solo and small practices under $500K in revenue are rarely PE targets and continue to trade on the older 0.9x-1.3x revenue convention because they lack the staff depth platforms need.
Related
- Professional services — similar relationship-based, high-retention model
- Healthcare services — comparable licensed-professional practice valuation dynamics
- All industry multiples
Sources & Further Reading
- BizBuySell Accounting & Tax Practice Valuation Benchmarks — 2025 closed-transaction data
- CT Acquisitions CPA and Accounting Firm M&A Multiples Report 2026 — size-tiered multiple bands
- IBBA Market Pulse — quarterly transaction data by industry