Accounting Business Valuation Formula
Learn how monthly revenue, expenses, owner add-backs, and an annual earnings multiple are used to estimate an accounting business value.
This calculation estimates an indicative value for an accounting, bookkeeping, payroll, or advisory business. It converts representative monthly performance into annual adjusted earnings, then applies a selected earnings multiple as a starting point for valuation discussions.
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Estimated Business Value
Where:
Add the two monthly revenue streams, subtract normal operating expenses, add supportable owner add-backs, annualize the resulting earnings, and multiply by the selected annual earnings multiple. Negative adjusted earnings are treated as zero for this estimate.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| monthlyRecurringRevenue - Monthly recurring revenue | Predictable monthly income from recurring accounting, bookkeeping, payroll, or advisory clients. | currency |
| monthlyOtherRevenue - Other monthly revenue | Average monthly income from non-recurring work, such as projects, setup fees, and one-off consulting. | currency |
| monthlyOperatingExpenses - Monthly operating expenses | Normal monthly costs of running the business, including payroll, contractors, software, rent, marketing, insurance, and similar costs. | currency |
| monthlyOwnerAddBacks - Monthly owner add-backs | Supportable owner-related or discretionary costs that may not continue under a buyer. | currency |
| earningsMultiple - Annual earnings multiple | The number of times annual adjusted earnings used to estimate value. | number |
Step-by-Step Calculation
Calculate monthly total revenue
Combine predictable recurring income with average non-recurring monthly income.
monthlyTotalRevenue = monthlyRecurringRevenue + monthlyOtherRevenue
Calculate monthly adjusted earnings
Subtract normal operating costs and add back eligible, supportable owner costs.
monthlyAdjustedEarnings = monthlyTotalRevenue - monthlyOperatingExpenses + monthlyOwnerAddBacks
Annualize adjusted earnings
Convert representative monthly adjusted earnings into a 12-month figure.
annualAdjustedEarnings = monthlyAdjustedEarnings * 12
Calculate the adjusted earnings margin
Express monthly adjusted earnings as a percentage of monthly total revenue.
adjustedEarningsMargin = (monthlyAdjustedEarnings / monthlyTotalRevenue) * 100
Apply the earnings multiple
Apply the selected multiple to positive annual adjusted earnings. A negative earnings result produces a zero value in this simplified formula.
estimatedBusinessValue = max(0, annualAdjustedEarnings) * earningsMultiple
Compare value with recurring revenue
This supporting metric shows estimated value as a multiple of one month of recurring revenue.
valueToMonthlyRecurringRevenue = estimatedBusinessValue / monthlyRecurringRevenue
Example: Small accounting practice valuation
Monthly total revenue
$20,000 + $2,000
$22,000
Monthly adjusted earnings
$22,000 - $12,000 + $1,000
$11,000
Annual adjusted earnings
$11,000 * 12
$132,000
Adjusted earnings margin
($11,000 / $22,000) * 100
50.0%
Estimated business value
$132,000 * 3.0
$396,000
Value to monthly recurring revenue
$396,000 / $20,000
19.8x
Final Result
Estimated business value: $396,000, based on annual adjusted earnings of $132,000 and a 3.0x earnings multiple.
Assumptions
- ✓Monthly revenue, expenses, and add-backs represent a normal trading period rather than an unusual month.
- ✓Adjusted monthly earnings can reasonably be annualized by multiplying by 12.
- ✓Owner add-backs are genuine, documented, and potentially acceptable to a buyer.
- ✓The selected earnings multiple reflects business quality, risk, and market conditions.
- ✓The business has positive adjusted earnings; the formula does not assign a negative business value.
Limitations
- !A buyer may normalize revenue, expenses, owner compensation, and add-backs differently after review.
- !The calculation does not include debt, surplus cash, working-capital adjustments, taxes, transaction costs, or deal structure.
- !Client concentration, retention, contracts, staff dependence, compliance issues, and growth can materially affect value.
- !A one-month snapshot may not capture seasonality, lost clients, price changes, or recent changes in profitability.
Common Mistakes to Avoid
Using a strong or weak one-off month instead of a representative monthly average.
Treating every owner expense as an add-back without evidence that it would not continue after a sale.
Leaving out payroll, contractor costs, software subscriptions, or other normal operating costs.
Applying an earnings multiple to revenue instead of adjusted annual earnings.
Assuming the estimate is the final sale price without considering debt, cash, working capital, and due diligence.
Related Formulas
Frequently Asked Questions
What is the formula for valuing an accounting business from monthly figures?
A simple earnings-based formula is: positive monthly adjusted earnings multiplied by 12, then multiplied by an annual earnings multiple. Monthly adjusted earnings equal total monthly revenue minus operating expenses plus supportable owner add-backs.
Why are monthly adjusted earnings multiplied by 12?
Multiplying by 12 annualizes the monthly estimate so it can be used with an annual earnings multiple. This works best when the monthly figures are representative of normal operations.
What happens if adjusted earnings are negative?
This calculator uses zero rather than a negative amount when applying the earnings multiple. A business with negative earnings may still have assets or strategic value, but that requires a broader assessment.
Are owner add-backs included before or after expenses?
They are added after normal operating expenses are deducted. This reflects costs recorded in the accounts that may not continue for a buyer, if they are supportable.
How is adjusted earnings margin calculated?
Divide monthly adjusted earnings by monthly total revenue and multiply by 100. The result shows the percentage of revenue remaining as adjusted earnings.
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