The quote is ready and the last question is how to pay. One company offers a single fixed figure. Another offers an hourly rate. The right choice depends less on price and more on how sure you are about what you want built.
What is a fixed price contract?
The developer agrees to deliver a defined scope for an agreed total, usually paid in milestones. If the work takes longer than planned, the developer carries the cost. Because of that, the scope must be written in detail first, and anything outside it becomes a paid change. It suits a business website, a POS for a known type of shop or an ERP whose workflows have been mapped in discovery.
What is time and materials?
You pay for the time actually spent, at agreed rates, usually billed monthly or per sprint. Nothing is fixed except the rate, so you can change direction without a contract argument. It suits a new product, a mobile app whose features will change after user feedback, or continuing support and improvements after launch.
How do the two compare?
| Fixed price | Time and materials | |
|---|---|---|
| Who carries cost risk | The developer | The client |
| Scope | Written and agreed first | Can change as you go |
| Budget certainty | High for the agreed scope | Lower; managed by monthly caps |
| Changes | Priced as change requests | Simply added to the work |
| Best for | Clear, known requirements | New products and ongoing work |
| Main danger | Arguments about what was included | Costs drifting without review |
Is there a middle way?
Most business software uses one. A paid discovery stage produces a written scope; the core build is then quoted as fixed price milestones, each paid when a working release runs on your own data; and changes after go-live move to time and materials or a monthly support plan. That is how Operix quotes: milestones agreed in a written quote, and changes priced before they are built. Our guide to what custom software costs after launch covers the support side.
Which should you choose?
- Choose fixed price when you can describe the workflows, reports and users, ideally in a requirements document.
- Choose time and materials when you are testing an idea, building a product for the market or improving a live system month by month.
- Choose the mix when the core is clear but you expect to learn after go-live, which is true of most ERP software.
What protects you in either contract?
- Payments tied to working releases you can test, not to calendar dates.
- A written change process: request, estimate, your approval, then work.
- Clear ownership of the code and data, and access to both.
- A monthly report of work done, especially under time and materials.
For the bigger picture of picking a team, read how to choose a software development partner. To see how a quote is built, look at our pricing page or contact us with your scope.
Questions people ask
Is fixed price cheaper than time and materials?
Not necessarily. A fixed quote includes a margin for the developer's risk, while time and materials charges only the hours used. Fixed price gives certainty; time and materials can cost less or more depending on how the work goes.
Can a fixed price project still cost more?
Yes, if you add work beyond the agreed scope. Those additions are change requests, priced and approved before they are built.
How do I control cost under time and materials?
Set a monthly cap, agree priorities each sprint and ask for a report of hours and finished work. Review it before approving the next period.
Which model does Operix use?
Usually milestones in a written quote for the agreed scope, with changes and later improvements priced separately or covered by a support plan. The model is agreed with each client before work starts.
