Fixed-Price vs. Time & Materials: Choosing the Right Model
The billing model you choose significantly affects how your project feels to run. Neither is inherently better — the right choice depends on your situation. This article helps you decide.
Fixed Price
What it is: You pay a defined price for a defined scope. If we exceed the estimated hours, that is our risk (assuming scope hasn't changed).
Best for:
- Well-defined, stable requirements
- Budget-sensitive projects where overspend is not acceptable
- Shorter projects (under 3 months)
- Projects where you can commit to the specification before work begins
Watch out for: Scope changes. Every change to a fixed-price contract triggers a change request. If your requirements are likely to evolve, fixed price can become expensive in administrative overhead and contingency.
Time & Materials
What it is: You pay for actual hours spent. If we finish faster than estimated, you pay less. If it takes longer (for reasons within our control), we absorb the overrun.
Best for:
- Complex or innovative projects where requirements will evolve
- Longer-running projects where flexibility is more valuable than budget certainty
- Projects with significant discovery needed before scope can be fixed
Watch out for: Budget control requires discipline. You need to engage actively with weekly burn reports and flag scope creep before it gets expensive.
Hybrid Models
Many of our projects use a hybrid: a fixed-price Discovery phase to define requirements precisely, followed by a T&M or fixed-price build phase. Ask your Account Manager about the right approach for your specific project.