The verdict in three sentences
For a SaaS module whose scope is still moving, capped time and materials usually costs less than a fixed price that bills the risk upfront and then bills it again through change orders. Fixed price remains relevant when the specification is frozen, the mockups are approved and the integrations are known. In both cases, the intellectual property and reversibility clauses protect your asset far more than the billing model does.
What you actually pay in each model
A vendor committing to a fixed price estimates the effort, then adds a provision for uncertainty. On a SaaS module of 90 to 110 person-days, that provision represents between 15 and 25% of the price in 2026. Under time and materials (T&M), you pay the days consumed at the average day rate, with no risk premium, but you carry the overrun risk yourself.
| Item | Fixed price | T&M (EUR 600/day) |
|---|---|---|
| Estimated effort | 100 days | 90 to 110 days |
| Base price | EUR 60,000 (incl. 15 to 25% risk margin) | EUR 54,000 to 66,000 |
| Average change orders observed | +20 to 40% (EUR 12,000 to 24,000) | Included in days consumed |
| Likely final cost | EUR 72,000 to 84,000 | EUR 58,000 to 72,000 |
| Budget visibility at kickoff | High | Medium, cap recommended |
| Scope flexibility | Low, every change is priced | High, trade-offs sprint by sprint |
| Client-side management load | Low | 0.5 to 1 day per week |
Change orders are not an anomaly: they reflect the normal discoveries of a software project (forgotten business cases, billing integration, extra user roles). Under fixed price, each discovery becomes a negotiation. Under T&M, it becomes a backlog item you prioritize.
Risk table by contract type
| Risk | Fixed price | T&M | Capped T&M (hybrid) |
|---|---|---|---|
| Budget overrun | Transferred to vendor, but rebilled as change orders | Carried by client | Shared beyond the cap |
| Quality cut to hold the price | High near the end | Low | Low |
| Tunnel effect (nothing visible before acceptance) | High | Low, demo every 2 weeks | Low |
| Scope dispute | Frequent | Rare | Rare |
| Vendor lock-in | Medium | Medium | Medium |
| Time to start | 3 to 6 weeks of specs | 1 to 2 weeks | 2 to 3 weeks |
The hybrid model is spreading among software publishers in 2026: T&M with a cap (for example EUR 66,000), a commitment on a defined MVP and shared savings if the cap is not reached. It combines T&M flexibility with a budget ceiling you can present to a board.
The clauses that matter more than the price
Whatever the model, four clauses determine what your SaaS is worth in 3 years.
| Clause | What to obtain | Common trap |
|---|---|---|
| Intellectual property | Assignment of economic rights to the specific code, on delivery or on payment of each sprint | Assignment conditional on final balance |
| Vendor components | Perpetual, free, transferable license on reused building blocks | License tied to the maintenance contract |
| Reversibility | Access to the Git repository, documentation, deployment scripts, 10 to 20 days of handover support | Handover billed at full day rate with no cap |
| Hosting | Cloud accounts opened in the client's name | Infrastructure in the vendor's name |
| Warranty | 3 months of defect fixing at no extra cost | Warranty limited to "blocking" defects |
Under French law, an IP assignment must be written and specify the rights assigned, their scope, purpose, territory and duration. A simple line saying "the client owns the code" is not enough, and most jurisdictions have similar formal requirements.
Mini case study
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Thomas, CEO of a management software publisher in Nantes, receives two proposals for a SaaS scheduling module. Agency A offers a fixed price of EUR 60,000. Agency B offers T&M at EUR 600 per day, estimated at 100 days, capped at EUR 66,000.
His history shows 30% change orders on his last two fixed-price projects. Likely fixed-price cost: 60,000 × 1.30 = EUR 78,000. Likely T&M cost: 100 days × EUR 600 = EUR 60,000, plus 6 days of internal management valued at EUR 400, i.e. EUR 2,400, so EUR 62,400. The estimated gap is EUR 15,600, or 20% of the budget, and Thomas also gets a demo every two weeks to adjust the product with his first customers.
FAQ
Is fixed price always safer for a tight budget?
It is more predictable at the start, but 20 to 40% change orders are common when the scope is not frozen. If your mockups are not 90% approved, capped T&M often delivers a lower final cost.
What day rate is reasonable in France in 2026 for SaaS development?
The range is EUR 450 to 750 per day (about USD 490 to 820) depending on seniority and city. A EUR 600 rate matches an experienced team with a technical lead.
How do you avoid the tunnel effect under T&M?
Require 2-week sprints with a demo and a weekly report of days consumed. Set an alert at 80% of the cap to make decisions before any overrun.
Who should own the code repository?
The client, from day one, on its own GitHub or GitLab account. This keeps reversibility to 10 to 20 days instead of months of reconstruction.
Can you switch from fixed price to T&M mid-project?
Yes, through an amendment, often after an MVP delivered at a fixed price. Include the clause at signature to avoid renegotiating the whole contract.
Let's scope your project. Send us your scope and constraints: we will price it both as fixed price and as capped T&M, with timelines and ownership clauses spelled out. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.