A time and materials (T&M) contract is a billing arrangement in which the client pays for the actual hours worked and resources consumed on a project, rather than agreeing to a single fixed price upfront. Rates are typically set per role (e.g., senior developer, QA engineer) and invoiced on a recurring schedule, usually weekly or monthly.
How a Time and Materials Contract Works
In a T&M engagement, the client and vendor agree on hourly or daily rates for each role involved, along with any material costs (software licenses, infrastructure, third-party tools) that will be passed through. The vendor tracks time against agreed tasks or sprints and submits itemized invoices on a set cadence. Scope can shift from one billing period to the next without renegotiating the entire contract — a new feature, a change in priorities, or a scaled-up team is simply reflected in the next invoice. Most T&M agreements include a not-to-exceed clause or a rolling budget forecast so the client retains cost visibility even though the total price isn't fixed at signing.
Time and Materials Contract vs. Fixed-Price Contract
The real decision most buyers face is T&M versus fixed-price. A fixed-price contract locks in scope, timeline, and cost before work begins — it favors predictability but penalizes change. A time and materials contract favors flexibility and transparency but requires more active budget management from the client.
| Time and Materials | Fixed-Price | |
|---|---|---|
| Scope | Flexible, can evolve | Locked at signing |
| Cost predictability | Variable, tracked per period | Fixed upfront |
| Best fit | Evolving or unclear requirements | Well-defined, stable requirements |
| Client involvement | Ongoing oversight needed | Lower after sign-off |
When a Time and Materials Contract Makes Sense
- Requirements are expected to change as the product or market feedback evolves
- You're building something new and can't fully specify scope before development starts
- You want the ability to reprioritize the backlog without a formal change order each time
- You need to scale a team up or down based on velocity or budget cycles
- It makes less sense when: the deliverable is narrow and well-understood (a fixed-price or milestone-based contract gives more cost certainty), or your internal team lacks the bandwidth to review hours and provide regular direction.
Time and Materials Contracts at Bydrec
Bydrec structures most nearshore engagements as time and materials, since the majority of clients are scaling engineering teams against evolving roadmaps rather than a single fixed deliverable. Rates are set per role, invoicing is transparent, and clients can adjust team size or focus as priorities shift — similar in spirit to how staff augmentation engagements are typically billed.
If you're weighing contract models for a nearshore engineering team, see how CTOs evaluate vendors in the nearshore vetting framework, or get in touch to discuss what structure fits your project.
