Definition
Time and Materials (T&M) is a contract model where the client pays the vendor based on the actual hours or days worked by the vendor's resources (Time), plus the cost of any direct expenses or third-party software (Materials), according to a pre-agreed [Rate Card](/glossary/rate-card).
Explanation
T&M is the safest commercial model for professional services firms.
Because the vendor is paid for every hour worked, the financial risk of [Scope Creep](/glossary/scope-creep) is completely eliminated. If the client decides halfway through a project that they want to add a complex new feature, the vendor simply says "Yes," assigns the resources, and bills the extra hours.
The Procurement Friction
While vendors love T&M, enterprise procurement teams hate it. From a buyer's perspective, T&M shifts 100% of the delivery risk onto their shoulders. They have no guarantee of what the final cost will be, making internal budget approvals difficult. Furthermore, a skeptical buyer might worry that a T&M structure incentivizes the vendor to work slowly or over-staff the project (often called "milking the contract").
To win a T&M deal, the vendor must build immense trust with the buyer through transparency.
Commercial Checklist for T&M Proposals
- Clear Rate Cards: Are the roles, seniority levels, and hourly/daily rates clearly defined to prevent disputes over who is performing the work?
- Detailed Estimates: Even though it is T&M, did you provide a realistic estimate of total hours? (Bait-and-switch estimating ruins client trust and guarantees they will cancel the contract).
- Reporting Cadence: Does the proposal commit to weekly burn-rate reporting so the client is never surprised by an invoice?
- Expense Policies: Are the rules for billing "Materials" (e.g., travel, software licenses) explicitly stated, including whether administrative markups apply?
Related Concepts
- [Fixed Price Contract](/glossary/fixed-price-contract)
- [Rate Card](/glossary/rate-card)
- [Scope Creep](/glossary/scope-creep)
- [Margin Leakage](/glossary/margin-leakage)
What is a 'T&M with a Cap' or 'Not to Exceed' (NTE) contract?+
It is a hybrid model where the vendor bills hourly up to a maximum budget limit. It offers the worst of both worlds for the vendor: they bear the risk of overruns (like fixed price) but cannot capture upside profit if they finish early (like pure T&M).
Why is T&M best for Agile software development?+
Agile methodologies assume that requirements will change as the project progresses. A T&M contract aligns with this by allowing the client to pivot priorities sprint-by-sprint, paying only for the team's capacity rather than fighting over a fixed scope.
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