A rule of thumb is a shortcut formula, not a valuation.
A rule of thumb is a shortcut formula, not a valuation. Phrases such as 1x revenue or 3x seller’s discretionary earnings ignore margin quality, owner time, company size, customer transfer, capital needs, and the cash-versus-note mix. Use the shortcut only after a documented earnings bridge, and only as a reasonableness check against a company-specific analysis.
What to know before using the headline number
- A rule of thumb is a compressed slogan. It is not a substitute for earning-capacity analysis, comparable evidence, or a defined transaction perimeter.
- 1x revenue ignores gross margin, pass-through spend, owner time, and whether sales are transferable. Two companies with identical billings can have opposite economics.
- 3x SDE is only as good as the discretionary-earnings bridge behind it. Multiplying an undocumented figure scales the error.
- Size, customer transfer, capital needs, and cash-versus-note terms change value even when the slogan stays fixed.
- Use a popular formula only after the earnings bridge exists, and only as a sanity check. If the shortcut and the analysis disagree, keep the analysis.
A rule of thumb is a slogan, not an appraisal
Owners hear compact formulas because they are easy to repeat: one times revenue, three times seller’s discretionary earnings, a percentage of collections, or some other industry catchphrase. The International Business Brokers Association defines a rule of thumb as a mathematical relationship drawn from experience, observation, hearsay, or some mix of those, usually labeled as industry-specific. That definition is useful because it admits the method’s origin. It is folklore compressed into arithmetic, not a substitute for analyzing the business that actually exists.
Revenue Ruling 59-60, reproduced in the IRS valuation job aid for closely held companies, does not reduce value to one ratio. It asks about the nature and history of the business, the economic outlook, financial condition, earning capacity, dividend-paying capacity, goodwill and other intangibles, prior sales of the interest, and prices of similar companies. A single multiplier cannot carry those questions. When an owner treats 1x revenue as the answer, the remaining factors get silently assumed rather than tested.
Earnings quality never appears in the slogan
Two companies can report the same sales and deserve very different prices. One may collect retainer fees with documented delivery margin, diversified clients, and a staff that already handles the accounts. Another may book the same top line by passing through media spend, running a 38 percent gross margin, and relying on the founder for more than half of client time. Multiplying both by the same revenue factor treats those facts as irrelevant.
The same problem appears in a 3x SDE slogan. Seller’s discretionary earnings is a defined earnings construct, not a pile of cash sitting in the register. If the SDE figure still includes one-time projects, underpaid family labor, deferred hiring, or personal expenses mixed with operating costs, multiplying it simply scales the error. The IBBA glossary treats discretionary earnings as a normalized benefit stream after specified adjustments. A rule of thumb that never inspects those adjustments is multiplying a rumor.
Size, transfer risk, and terms change the economics
Smaller companies usually carry more owner dependence, thinner management, and greater customer concentration. Those traits affect both the earnings a buyer can inherit and the risk assigned to those earnings. A formula that is indifferent to size will overstate a founder-centric boutique and understate a transferable firm of similar sales. Census NAICS codes exist in part because advertising agencies, marketing consultancies, and custom software shops are not the same economic activity even when all three call themselves agencies.
Deal terms are another silent variable. Cash at closing, ordinary working capital, seller paper, earnouts, consulting, real estate, and inventory treatment can make two identical headlines unequal. A rule of thumb quoted as a purchase price rarely states which of those items it includes. BizBuySell’s published industry benchmarks are sold-business context, not a company-specific conclusion, and they cannot repair a formula that never defined the perimeter of the sale.
Owner time and pass-through spend break a revenue multiple
In a digital marketing agency, billed media and platform spend can inflate revenue without creating transferable gross profit. In the hypothetical agency used later in this article, 1x revenue applied to $1,847,000 of gross billings would also capitalize $312,000 of pass-through media. The formula then values dollars the company does not keep. Net revenue, gross profit by client, and retainer durability are the economic facts. The revenue multiple never asks for them.
Owner time is the other hidden denominator. If the founder still spends about 55 percent of working hours on account leadership, creative direction, or sales, a buyer must replace that labor. A 1x revenue quote that assumes the founder continues working for free is not a sale price; it is a job offer dressed as an exit. Replacement cost belongs in the earnings bridge before anyone reaches for a slogan.
Use the shortcut only after a real earnings bridge
A useful sequence is the reverse of what many owners do. Reconcile statements to tax returns and the ledger. Separate pass-through amounts. Recast owner compensation, related-party items, and genuine one-time events. Insert missing costs a buyer will incur. Then, and only then, look at whether a popular formula lands anywhere near the company-specific range. If the slogan and the analysis diverge, the analysis wins.
The SBA’s acquisition guidance treats valuation as one step in a larger process that also includes agreements, diligence, and professional support. A rule of thumb skips the process and jumps to a number. That is why it feels efficient and why it so often misleads. Efficiency that omits evidence is not analysis.
What a sanity check actually looks like
After the bridge exists, a rule of thumb can still have a narrow job: catching an extreme. If a recast that a buyer can rebuild implies a value far above every supportable market comparison, the owner should ask which assumption is heroic. If the implied value is far below asset backing, the owner should ask whether earnings, working capital, or nonoperating assets were misclassified. The slogan is a tripwire, not the measurement.
The hypothetical agency later in this article was quoted 1x revenue despite a 38 percent gross margin and 55 percent owner time. The slogan produced a confident headline and an unusable diligence file. A sanity check after the bridge would have shown that the formula was valuing billed spend and founder hours the buyer would not inherit. That is the only respectable use of a rule of thumb: to ask whether the real work still makes sense.
What a rule of thumb silently assumes
Every slogan smuggles assumptions about earnings quality, labor, size, transfer, and terms. Make those assumptions explicit before anyone multiplies.
| Issue | What the owner should assemble | What a buyer is likely to test | Why it changes the decision |
|---|---|---|---|
| Earnings quality | Gross profit by client or job, pass-through schedule, recurrence, and a recast tied to the ledger. | Rebuild margin and remove billed spend the company does not keep; test whether SDE is a defined construct. | A high revenue multiple on thin or non-owned margin overstates value immediately. |
| Owner labor load | Weekly hour map, account ownership, rainmaking, and duties a buyer must replace. | Cost the replacement roles and subtract them from any SDE that assumed free founder time. | Formulas that ignore 55 percent founder involvement are pricing a job, not an exit. |
| Industry identity | Actual services, contracts, and NAICS-consistent description of the economic activity. | Reject comparables from a different operating model even if the trade name says agency or shop. | Mixing advertising, consulting, and software businesses into one slogan produces a meaningless average. |
| Size and concentration | Revenue scale, top-client share of gross profit, and staff depth beyond the owner. | Stress the loss of the largest accounts and the absence of account managers. | Smaller, concentrated firms rarely deserve the same factor as transferable firms with similar sales. |
| Deal terms and perimeter | Included assets, working capital, cash, debt, real estate, and any seller paper. | Restate the slogan as cash at close versus deferred consideration. | A 1x headline that includes a note, excludes inventory, or forgets working capital is not a comparable price. |
Worked example: an agency quoted 1x revenue with a 38 percent gross margin
This example is hypothetical. A digital marketing agency reports $1,847,000 of gross billings. A well-meaning adviser quotes 1x revenue as a sale price. Gross margin is 38 percent. The founder still spends about 55 percent of working time on account leadership and sales. The review tests the slogan instead of multiplying it.
| Item | Amount | What the slogan assumed | Bridge treatment |
|---|---|---|---|
| Gross billings | $1,847,000 | 1x revenue equals $1,847,000 of value | Starting top line only |
| Pass-through media and platform spend | $312,000 | Treated as if it were owned revenue | Remove from the economic base |
| Gross profit at 38 percent of billings | $701,860 | Ignored by the revenue formula | Primary operating fact |
| Claimed SDE before labor correction | $478,000 | Someone might next apply 3x SDE | Needs owner-time testing |
| Founder account-leadership replacement | $127,000 | Assumed the founder keeps working unpaid | Subtract from maintainable earnings |
| Freelance overflow the buyer still needs | $41,800 | Added back as discretionary | Retain as operating cost |
Net of pass-through spend, the company is a $1,535,000 net-revenue shop with $701,860 of gross profit, not a $1,847,000 earnings engine. Applying 1x to billings values $312,000 of media that never belongs to the firm. That single classification error is larger than many legitimate add-backs.
The claimed $478,000 SDE falls to about $309,200 after a $127,000 replacement for founder account leadership and restoration of $41,800 of necessary freelance delivery. A 3x slogan on the uncorrected SDE would have implied $1,434,000. The slogan and the bridge are not cousins. They are different businesses.
None of these figures is a market multiple, a concluded value, or a promise of proceeds. They show why a rule of thumb cannot be the first step. Census classification would also matter: an advertising agency, a marketing consultancy, and a development shop can share a website style and still be different NAICS activities. The formula never asks which one you are.
Replace the slogan with a six-step reasonableness file
Do the company-specific work first. Invite the rule of thumb in last, and only as a tripwire.
- 01
Name the economic activity
Describe what customers actually buy, how the company is paid, and which NAICS-consistent industry that activity resembles. Do not accept a trade-name label as the comparable set.
Deliverable: One-page operating-model memo
- 02
Separate owned revenue from pass-through
Split gross billings, media, product resale, reimbursable spend, and retained fees. Tie the split to invoices and the ledger.
Deliverable: Gross-to-net revenue bridge
- 03
Build the earnings construct
Recast to SDE or adjusted EBITDA with documents, then insert replacement labor, market occupancy, and other buyer-required costs.
Deliverable: Normalized earnings bridge
- 04
Map transfer risk
Measure owner hours, client concentration, contract assignment, and staff who actually hold relationships.
Deliverable: Transfer-risk schedule
- 05
Define the sale perimeter
State included assets, working capital, cash, debt, real estate, and expected consideration mix before anyone quotes a factor.
Deliverable: Included-asset and terms sheet
- 06
Run the slogan last
Compute the popular formula on the uncorrected and corrected bases. If they diverge, write why the analysis governs.
Deliverable: Rule-of-thumb variance memo
Where otherwise credible analyses break down
Valuing billed spend as if it were owned revenue
Why it matters: Pass-through media, product resale, and reimbursable costs inflate 1x formulas without creating transferable gross profit.
Better approach: Use net revenue and gross profit as the economic base, then decide whether any revenue multiple is even relevant.
Applying 3x to an undocumented SDE
Why it matters: The multiple inherits every missing cost, double-counted perk, and one-time project inside the earnings figure.
Better approach: Lock a documented discretionary-earnings definition before any factor is discussed.
Borrowing a formula from a dissimilar NAICS activity
Why it matters: Agencies, consultancies, contractors, and product firms have different capital needs and transfer profiles.
Better approach: Match operating model first, then look at market evidence with disclosed sources and definitions.
Treating the slogan as cash at closing
Why it matters: Working capital, debt, notes, and excluded assets can make the headline unrecognizable as proceeds.
Better approach: Translate every indication into a sources-and-uses sketch before comparing it with a rule of thumb.
What a defensible owner decision looks like
I would rather walk an owner through a smaller, documented earnings base than flatter them with 1x revenue that diligence will dismantle. Rules of thumb survive because they are memorable. They mislead because they skip the questions Revenue Ruling 59-60 actually asks: what is this company, what can it earn, and what would a buyer of a similar interest pay.
If you already heard a slogan at a conference or from a neighbor, keep it in the file as a hypothesis. Then build the bridge. When the formula and the evidence disagree, the evidence is the valuation work. The formula is a caption.
The agency example is the whole lesson in miniature. A 38 percent gross margin and 55 percent founder time are not footnotes. They are the business. Any shortcut that cannot see them is not conservative or aggressive. It is blind.
Questions owners ask
Is 1x revenue ever a reasonable way to value an agency?
Only by coincidence. Revenue can be a secondary check after net revenue, gross profit, owner replacement, client transfer, and capital needs are understood. Using 1x sales as the primary method treats margin, labor, and terms as if they do not exist.
Does 3x SDE mean my company is worth three times last year’s profit?
No. The earnings figure must be a documented discretionary-earnings construct, not raw profit, and the multiple is not a constant. Size, risk, transferability, assets, and deal terms still matter. A slogan does not freeze those variables.
When is a rule of thumb useful at all?
After a company-specific earnings bridge exists, a popular formula can serve as a reasonableness check. If the shortcut and the analysis disagree, investigate the disagreement. Do not let the shortcut replace the analysis.
Do published marketplace benchmarks replace a rule of thumb?
They are better than hearsay when the source, period, and definitions are disclosed, but a national category range is still context. It does not assign your company to a quartile or define your deal terms.
Can I average several rules of thumb to be safer?
No. Averaging slogans compounds classification errors. If none of the formulas inspects earnings quality, the average is still uninformed.
What if a buyer opens with a rule of thumb?
Ask which earnings measure, period, inclusions, and terms the factor assumes. Then put your bridge on the table. A serious buyer can work from evidence. A slogan-only buyer is telling you how they underwrite.
Sources and review date
Last reviewed: September 3, 2026. Sources are linked for context; a national benchmark is not a substitute for local comparable sales or a purpose-specific appraisal.
- IRS valuation job aid and Revenue Ruling 59-60 — Appendix A reproduces Revenue Ruling 59-60 and its closely held business valuation factors; the job aid itself states that it is not legal authority.
- BizBuySell industry valuation benchmarks — Reported Main Street sold-business data. A national category range is context, not a company-specific conclusion.
- International Business Brokers Association glossary — Professional definitions for SDE, transaction terms, and Main Street business brokerage concepts.
- U.S. Small Business Administration: Merge and acquire businesses — Owner-oriented guidance on valuation, agreements, due diligence, and professional support in an acquisition.
- U.S. Census Bureau: North American Industry Classification System — Official industry definitions used to separate economically different operating models before selecting comparable data.
- U.S. Small Business Administration: Close or sell your business — Current owner guidance on sale planning, valuation approaches, sale agreements, transfer choices, professional advice, and maintaining required records.
- U.S. Census Bureau: County Business Patterns — Public establishment, employment, and payroll context by industry and geography; not a source of transaction multiples.