Billable time needs an approved source
Use the time-tracking system, approved timesheets, or another controlled record to establish hours by employee, contractor, role, project, and date.
Late edits should remain visible so the invoice history can be explained.
Match hours to contract rates
Contracts can contain different rates by role, overtime rules, blended rates, caps, minimums, travel treatment, and reimbursable expenses.
Build the billing logic from the signed contract rather than a spreadsheet that only one project manager understands.
Keep pass-through expenses distinct
Travel, materials, subcontractors, and other reimbursable costs may be billed at cost, with markup, or under another agreed rule. Preserve vendor support and customer approval where required.
Do not bill an expense twice because it appeared in both an employee report and vendor invoice.
Reconcile invoiced value to project profitability
Compare billed hours and costs with actual delivery labor and direct expenses. Write-offs, nonbillable rework, and unapproved time should remain visible instead of disappearing from the project record.
This turns T&M billing data into a useful margin and staffing signal.
Questions buyers usually ask
What records support time-and-materials invoices?
Keep approved time, contract rates, reimbursable expense support, project approvals, invoice calculations, and any customer adjustments.
Why track nonbillable time on a T&M project?
It helps management understand delivery efficiency, write-offs, and true project profitability even when the customer is not billed for those hours.
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