You're shopping for a custom software project. Every firm you talk to quotes you "time and materials" — an hourly rate, an estimate of hours, and a disclaimer that it could change.
That's not a quote. That's a guess with your checkbook attached. As the Harvard Business Review notes, this billing model can create perverse incentives that work against clients.
Here's why fixed-price software development is almost always the better deal for clients — and why most firms refuse to offer it.
What Is Fixed-Price vs Time and Materials in Software Development?
Fixed-price software development means you pay a set amount for defined deliverables — the vendor bears the risk of cost overruns. Time and materials (T&M) means you pay hourly for actual work performed — you bear the risk. According to the Project Management Institute, fixed-price contracts work best for well-defined projects with clear scope, while T&M suits exploratory or ongoing work.
The T&M Incentive Problem
Time and materials billing has a fundamental misalignment: the vendor gets paid more when the project takes longer.
Nobody's being malicious about it (usually). But when a developer runs into a problem and the clock is running, there's no pressure to find the fastest solution. When scope creep happens, there's no incentive to push back. When the estimate was wrong, you're the one paying for the mistake.
With fixed pricing, the incentives flip. If I scope a project at $8,000, I need to deliver it for $8,000. That means:
- I ask better questions upfront
- I push back on scope creep (because it costs me)
- I find efficient solutions (because my margin depends on it)
- I've actually done this type of work before (because I can't afford to guess)
"But What If the Scope Changes?"
This is the objection I hear most. And it's fair — software projects do evolve.
The answer is simple: we handle scope changes as explicit conversations, not silent billing adjustments.
If you want to add a feature that wasn't in the original scope, we discuss it, I quote the addition, and you decide if it's worth the extra cost. No surprises on the invoice.
Compare that to T&M, where scope changes just… happen. The hours go up, the estimate gets revised, and by the time you notice, you're 40% over budget with no clear understanding of why.
When T&M Makes Sense
I'll be honest — there are scenarios where T&M is the right call:
- Ongoing maintenance where you can't predict what'll break
- Research/exploration where the outcome isn't defined yet
- Staff augmentation where you're essentially hiring a contractor
But for defined projects with clear deliverables — building an app, implementing AI into a workflow, creating a customer portal — fixed pricing protects you and produces better outcomes.
What to Look For in a Fixed-Price Quote
Not all fixed-price proposals are equal. A good one includes:
- Detailed deliverables — exactly what you're getting, feature by feature
- Timeline with milestones — when you'll see working software, not just a final date
- What's NOT included — the exclusions matter as much as the inclusions
- Change process — how scope additions are handled
- Post-launch support — what happens after deployment
If a firm gives you a fixed price with a vague scope, you're not getting fixed pricing — you're getting a low-ball that will lead to change orders. That's T&M in disguise.
The Real Reason Most Firms Won't Do Fixed Pricing
It's harder.
Fixed pricing requires the firm to accurately scope work, which means they need to have done it before. They need to understand the technology, the likely edge cases, and the real-world complexity.
Most generalist consulting firms can't do this because they're staffing projects with whoever's available. They don't have deep expertise in your specific problem — they have bodies and an hourly rate.
A specialist who's built similar systems can give you a confident fixed price because they know what they're building. That expertise is what you should be paying for. Learn more about our fixed-price development services →
The Bottom Line
When someone quotes you time and materials, they're saying: "I'm not sure what this will cost, so I'd like you to carry that risk."
When someone quotes you a fixed price, they're saying: "I know what this takes, and I'm willing to stake my margin on it."
Which one gives you more confidence? If you're evaluating development partners, check our guide on how to choose a software development partner for more decision frameworks.