Accountants Project Cost (Monthly) Formula
Learn how to calculate a monthly accounting project cost, target client fee, expected profit, and effective hourly fee.
This calculation estimates what a recurring accounting engagement costs to deliver each month and the client fee needed to retain a chosen profit margin. It combines staff time, allocated overhead, and direct project costs so pricing is not based on labour alone.
- 100% Free
- No Sign-Up Required
- Private & Secure
- Mobile Friendly
Recommended Monthly Client Fee
Where:
First calculate the total monthly delivery cost. Then divide that cost by the share of fee revenue that remains after the target profit margin is set aside.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| monthlyHours - Monthly project hours | The total staff hours expected to be spent delivering the client work each month. | hours |
| hourlyStaffCost - Average hourly staff cost | The average fully loaded hourly cost of the staff assigned to the engagement. | currency |
| monthlyOverheadAllocation - Monthly overhead allocation | The monthly share of firm overhead allocated to the engagement, such as administration, insurance, rent, and management. | currency |
| otherMonthlyCosts - Other monthly project costs | Direct monthly costs specific to the client, such as software, subcontractors, travel, or filing costs. | currency |
| targetProfitMargin - Target profit margin | The percentage of the client fee intended to remain as profit after estimated delivery costs. | percent |
| monthlyProjectCost - Monthly project cost | The estimated total monthly cost to deliver the engagement. | currency |
Step-by-Step Calculation
Calculate monthly labour cost
Multiply planned monthly staff hours by the average fully loaded hourly staff cost.
monthlyLabourCost = monthlyHours * hourlyStaffCost
Add overhead and direct costs
Add the allocated business overhead and any project-specific monthly costs to labour cost.
monthlyProjectCost = monthlyLabourCost + monthlyOverheadAllocation + otherMonthlyCosts
Convert the margin to a decimal
Convert the target percentage into decimal form for the pricing calculation.
targetMarginDecimal = targetProfitMargin / 100
Calculate the recommended monthly fee
Divide total cost by the revenue share left after the target margin. This produces the fee that supports the selected margin.
recommendedMonthlyFee = monthlyProjectCost / (1 - targetMarginDecimal)
Calculate expected monthly profit
Subtract estimated delivery cost from the recommended fee.
expectedMonthlyProfit = recommendedMonthlyFee - monthlyProjectCost
Calculate the effective hourly fee
Divide the recommended monthly fee by planned hours to show its hourly equivalent.
effectiveHourlyFee = recommendedMonthlyFee / monthlyHours
Example: Monthly bookkeeping and reporting engagement
Calculate labour cost
80 * 45
$3,600
Calculate monthly project cost
3,600 + 750 + 150
$4,500
Convert the target margin
30 / 100
0.30
Calculate recommended fee
4,500 / (1 - 0.30)
$6,428.57
Calculate expected profit
6,428.57 - 4,500
$1,928.57
Calculate effective hourly fee
6,428.57 / 80
$80.36 per hour
Final Result
Estimated monthly project cost: $4,500. Recommended monthly client fee: $6,428.57. Expected monthly profit: $1,928.57.
Assumptions
- ✓All cost inputs are stated in the same currency and exclude sales taxes such as VAT or GST.
- ✓The hourly staff cost is a fully loaded average cost that reasonably represents the delivery team.
- ✓Allocated overhead and direct costs recur each month at the entered amounts.
- ✓Planned monthly hours represent the expected effort needed to deliver the agreed scope.
- ✓The target margin is measured as profit divided by client fee revenue before taxes.
Limitations
- !Actual project hours may be higher or lower than the planned hours.
- !Scope changes, client queries, rework, and write-offs can reduce actual profitability.
- !A single blended hourly staff cost may not reflect changes in seniority mix across a month.
- !The calculation does not include sales taxes, payment processing charges, bad debts, or costs not entered.
- !A target fee is an estimate and may need to be adjusted for market conditions, contract terms, and the value of the service.
Common Mistakes to Avoid
Using employee pay alone instead of a fully loaded hourly employment cost.
Treating a markup on cost as if it were the same as a profit margin.
Leaving out overhead allocation because it is not billed directly to one client.
Entering annual software or insurance costs as if they were monthly costs without converting them.
Using billable hours rather than the total delivery hours needed, including review, communication, and administration.
Adding VAT or GST to costs when the fee calculation is intended to exclude sales taxes.
Related Formulas
Frequently Asked Questions
What is the formula for a recommended monthly accounting client fee?
The formula is monthly project cost divided by one minus the target profit margin expressed as a decimal: monthlyProjectCost / (1 - targetProfitMargin / 100).
How do I calculate monthly project cost for an accounting client?
Multiply planned monthly hours by hourly staff cost, then add the monthly overhead allocation and other direct project costs.
Why divide by one minus the profit margin?
The cost must represent the portion of the fee left after the intended profit share. For a 30% margin, costs need to fit within 70% of fee revenue.
Is a 30% margin the same as adding 30% to cost?
No. Adding 30% to cost creates a 23.08% margin on revenue. A 30% margin requires dividing cost by 0.70.
How is expected monthly profit calculated?
Expected monthly profit equals the recommended monthly fee minus the estimated monthly project cost.
What does effective hourly fee mean?
It is the recommended recurring monthly fee divided by planned monthly project hours. It helps compare a fixed monthly fee with an hourly equivalent.
Ready to calculate your result?
Use the calculator to get instant results with your own inputs.