Accountants Project Cost (Hourly) Formula
Learn how an hourly-based accounting project fee is calculated from labour, expenses, overhead and a target profit margin.
This calculation estimates a fixed accounting project fee from the expected time budget and project costs. It separates labour, direct expenses and overhead before adjusting the fee so that the remaining profit equals the selected percentage of the final quote.
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Recommended Project Fee
Where:
First calculate all estimated project costs. Then divide those costs by the portion of the final fee that remains after the target profit margin is reserved.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| H - Estimated billable hours | The total hours expected to deliver the accounting engagement. | hours |
| R - Hourly billing rate | The value assigned to each planned billable hour. | currency |
| E - Direct project expenses | Expected engagement-specific costs, such as filing charges, travel, outsourced work or specialist software. | currency |
| O - Overhead allowance | The percentage of labour cost allocated to general operating costs. | percent |
| M - Target profit margin | The desired profit as a percentage of the final quoted fee. | percent |
| C - Total project cost | The combined labour cost, direct expenses and overhead allowance. | currency |
Step-by-Step Calculation
Calculate the labour cost
Multiply the expected billable hours by the hourly billing rate.
labourCost = estimatedHours * hourlyRate
Calculate the overhead allowance
Apply the overhead percentage to the estimated labour cost.
overheadCost = labourCost * (overheadRate / 100)
Find total project cost
Add labour, direct expenses and allocated overhead.
totalProjectCost = labourCost + directExpenses + overheadCost
Calculate the recommended fee
Divide total cost by the share of the fee that is available to cover costs after the target margin.
recommendedProjectFee = totalProjectCost / (1 - targetProfitMargin / 100)
Calculate estimated profit
Subtract estimated project costs from the recommended fee.
estimatedProfit = recommendedProjectFee - totalProjectCost
Example: Fixed fee for a bookkeeping project
Labour cost
25 * 120
$3,000
Overhead allowance
3000 * (10 / 100)
$300
Total project cost
3000 + 200 + 300
$3,500
Recommended project fee
3500 / (1 - 20 / 100)
$4,375
Estimated profit
4375 - 3500
$875
Final Result
The estimated project fee is $4,375, with estimated project costs of $3,500 and estimated profit of $875.
Assumptions
- ✓Estimated hours include the work needed to complete the agreed project scope.
- ✓The hourly rate represents the value to recover for all planned billable time.
- ✓Overhead is calculated only as a percentage of labour cost.
- ✓The target profit margin is measured as a percentage of the final quoted fee.
- ✓Taxes are excluded unless they are included in direct project expenses.
Limitations
- !Actual time can differ when client information is incomplete, delayed or more complex than expected.
- !The calculation does not automatically include a contingency for scope changes, rework or collection risk.
- !Direct expenses may change after the quote is prepared.
- !The result is a planning estimate and does not determine an appropriate market price or engagement terms.
Common Mistakes to Avoid
Treating profit margin and markup as the same measure.
Applying the overhead percentage to the final fee rather than to labour cost.
Leaving out project-specific review, communication or administration time.
Using a target margin of 100%, which makes the formula invalid.
Forgetting to update estimated hours when the scope changes.
Related Formulas
Frequently Asked Questions
How is an hourly accounting project fee calculated?
Estimate labour from hours and rate, add direct expenses and overhead, then divide total cost by one minus the target profit margin.
Why does a 20% margin require dividing by 80%?
A 20% profit margin means 20% of the final fee is profit, leaving 80% of the fee to cover estimated costs.
What is the difference between profit margin and markup?
Profit margin is profit divided by the final fee. Markup is profit divided by cost. This calculator uses profit margin.
How is overhead calculated in this calculator?
Overhead equals estimated labour cost multiplied by the overhead allowance percentage.
Can the target profit margin be zero?
Yes. With a zero target margin, the recommended fee equals the estimated total project cost.
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