A PM/CM firm wins a project at a healthy multiplier. Two years in, the project looks fine on the monthly report. Revenue is on track. The client is happy. But the effective multiplier has quietly slid well below what was proposed.
Nobody made a bad decision. A series of small, reasonable staffing choices added up to a margin problem.
What multiplier drift is
For labor-based PM/CM contracts, the multiplier is the ratio between what you bill and what the labor costs you. It covers overhead and profit. When the actual staffing mix differs from the proposal, the effective multiplier changes.
Common causes:
- Senior staff covering work priced for junior roles
- Raises that outpace contract billing rates
- Billing rates fixed for years on a long contract
- Unbillable time charged to keep someone busy between assignments
- Rate caps by labor category that clip senior hours
Each is small. Over a large portfolio, they matter.
Why it is hard to see
Reports show revenue, not mix. Monthly reports focus on billings and budget burn. A project can be on budget and still eroding margin.
The data is spread out. Proposed staffing lives in the proposal. Actual hours and costs live in Deltek. Billing rates live in the contract. Combining them is manual.
It moves slowly. A few points of drift per quarter is easy to miss until the annual review.
Where the hours go
Finance teams who track this usually build a spreadsheet per project: export hours by employee, look up cost rates, look up billing rates, calculate effective multipliers, and compare to the proposal. It takes long enough that it happens once a year, if at all.
A better workflow
Track effective multiplier monthly
Calculate it per project and per labor category every month, using the same method each time.
Compare to what was proposed
Store the proposed multiplier and staffing mix with the project. Drift is only visible against a baseline.
Flag the causes
When multiplier drops, show why: which people, which categories, which months. "Margin is down" is not actionable. "A senior engineer has covered field inspection hours for three months" is.
Bring PMs into it
PMs control staffing. Show them their project's multiplier in plain terms, and they will often fix it themselves.
Plan rate escalations
On long contracts, know when cost rates will pass billing rates, and raise it with the client before the contract renewal, not after.
Where AI helps, and where it does not
It helps with:
- Combining Deltek labor data with proposal and contract information on a regular schedule
- Flagging projects where multiplier is sliding and explaining the drivers in plain English
- Letting leaders ask "which projects dropped below target last quarter?" directly
It does not replace:
- Staffing decisions that balance margin against client relationships and staff development
- Contract negotiations
- Judgment about acceptable short-term tradeoffs
What matters: consistent labor categories and accurate cost rates. Garbage in still produces garbage out.
How we approach it
IQ-Forecast helps PM/CM firms analyze Deltek financial data and forecast with fewer spreadsheets, including the project-level detail that shows where margin is going.
A useful next step
Pick your three largest labor-based contracts and calculate the effective multiplier for last quarter. Compare it to the proposal. If the numbers surprise you, talk to us.
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