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Bill Rate Vs. Cost Rate

Understanding Bill Rate vs. Cost Rate: Key Differences Explained

As a services business, your main product is time. Yet many companies lack real-time visibility into project profitability. Not all project phases or entire projects will always be profitable, but projects should never intentionally be planned at a loss. Mosaic addresses this by providing a clear, visual representation of the cost of time, making profitability per project and organization wide clear and transparent. 

Bill Rates

Bill Rates reflect the experience level of resources and are typically used for hourly work where fees are determined by hourly rates.

Cost Rate

Mosaic uses a Cost Rate (also known as the Fully Burdened Rate) to clearly show remaining amounts, representing profit when managing project fees.

Cost Rate Calculation:

The overhead multiplier conceptually represents how much you must multiply a billable hour to cover costs:

Total Overhead Cost/hour = Overhead Rate × Pay Rate

For example, if John’s pay rate (salary) is $50/hour, multiply by the Overhead Rate to cover all associated costs.

Overhead Rate Calculation

Overhead Rate = Total Overhead Cost ÷ Billable Project Labor Cost

Billable Project Labor Cost

Calculate using total payroll cost across the organization multiplied by the average utilization rate:

Billable Project Labor Cost = Organization Total Payroll Cost × Utilization Rate

Utilization rate refers to the percentage of billable hours across the organization (industry average typically around 59%). Mosaic’s Utilization Report (add help link) separates employees' billable and non-billable hours clearly.

Example:

  • Total Payroll Cost: $1,000,000

  • Utilization Rate: 59%

  • Billable Project Labor Cost: $590,000

Excluded from Total Overhead Costs

These pass-through reimbursable expenses are typically billed directly to clients.

  • Consultants

  • Reimbursables:

    • Shipping/courier/FedEx

    • Expediting/filing fees/permits

    • Printing costs

    • Material costs

    • Travel

Included in Total Overhead Costs

All non-billable operating expenses, such as:

  • Rent/mortgage

  • Utilities

  • Maintenance and repair

  • Furniture

  • Equipment (computers, printers, scanners, phones)

  • Supplies (paper, business cards, software)

  • Website costs

  • Insurance (general, professional, healthcare)

  • Unbilled travel

  • Taxes

  • Employee benefits (401k, social security)

  • Association fees, subscriptions

  • Marketing, advertising, business development

  • Bookkeeping/accounting

Plus non-billable labor salaries:

  • Administrative

  • Finance

  • Marketing

  • Business development

Bonuses may be included, though they are often taken out of profit. Where they are included is an organization preference. 

Finally, you’ll need to include billable employees’ non-billable time and PTO. If utilization is 59%, non-billable and PTO would account for 41%.

Example:

  • Non-Billable Labor Cost = Total Payroll Cost × (1 - Utilization Rate)

  • $1,000,000 × 41% = $410,000

Total Overhead Calculation:

Total Overhead Cost = Operating Expenses + Non-Billable Labor
$1,000,000 + $410,000 = $1,410,000

Final Overhead Rate:

Overhead Rate = Total Overhead Cost ÷ Billable Project Labor Cost
$1,410,000 ÷ $590,000 ≈ 2.39

While overhead rates vary, they typically range between 150% and 300%.

Billing Rate Multiplier:

Your billing rate should factor in desired profit:

Billing Rate = Cost Rate × (1 + Profit Margin)

If your cost rate is $100/hour and desired profit margin is 20%, the bill rate would be $120/hour.


This guide helps outline the overhead calculation process clearly. Due to the importance of accurately understanding your business's profitability, we recommend reviewing these calculations with your accountant for confirmation.


Budget v. Fee

The Fee always remains constant, serving as a fixed amount, while the Budget functions as an adjustment factor to either frontload or backload the fees, independent of the actual phase fee structure.

In both Cost Rate and Bill Rate scenarios, the Fee and Budget should be the same numbers. The key difference lies in how profit is realized:

  • In the Cost Rate view, the remaining budget after the project is completed represents the profit. Alternately you can turn on the setting to have a different budget for Cost and Bill Rates, which would allow you to set up the project where the remaining budget is set to reach zero dollars ($0) or greater, at project completion for a profitable project. 

  • In the Bill Rate view, the remaining budget is setup to reach zero dollars ($0) or greater, at project completion, the built-in profit margin within the Bill Rates is automatically realized.

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