Time and Materials
A billing method charging for actual hours worked plus materials used, typically with a cap.
Definition
Time and materials (T&M) billing charges clients for actual hours worked at agreed rates, plus any materials or expenses incurred. Unlike fixed-price contracts, T&M allows flexibility when project scope is uncertain. Invoices show detailed time entries and expense receipts, often with a "not-to-exceed" cap to limit client exposure.
T&M is common in consulting, IT services, legal work, and construction where scope may evolve. Rates are typically set by role (senior consultant vs. junior analyst) and may include overhead and profit margin. Detailed time tracking is essential for accurate T&M billing.
Why It Matters
T&M billing provides flexibility when requirements are unclear or likely to change. You're compensated for actual effort rather than taking scope risk. Clients benefit from only paying for work actually performed, rather than padding in fixed-price estimates.
The transparency of T&M builds trust—clients see exactly where time and money go. However, without caps or estimates, costs can exceed expectations. Most T&M contracts include estimates and cap provisions to balance flexibility with cost certainty.
Examples
- 1
An IT consultant bills T&M at $150/hour with weekly invoices showing task descriptions and hours.
- 2
A contractor quotes T&M with a not-to-exceed cap of $50,000, giving the client flexibility within a budget ceiling.
- 3
A law firm uses T&M billing with different rates for partners ($500/hour), associates ($300/hour), and paralegals ($150/hour).
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