The verdict in three sentences
A credible B2B SaaS MVP ranges from 30,000 to 80,000 EUR in 2026, delivered in 4 to 6 months with a multi-tenant architecture and subscription billing. The budget killer is not the initial build but recurring infrastructure (400 to 1,500 EUR/month) and technical debt when the foundation is rushed. Never fund a full V1 before an MVP focused on a single value promise has landed its first paying customers.
MVP vs full V1: what you actually buy
The costliest mistake is wanting a "finished" product from day one. An MVP validates a market hypothesis with the minimum; a V1 industrializes what worked. 2026 ranges for a B2B SaaS:
| Scope | MVP | Full V1 |
|---|---|---|
| Dev budget | 30,000 - 80,000 EUR | 90,000 - 250,000 EUR |
| Timeline | 4 to 6 months | 9 to 15 months |
| Core features | 3 to 5 | 12 to 20 |
| Multi-tenant | Yes (mandatory) | Yes + advanced isolation |
| Billing | Simple Stripe subscription | Usage billing + tiers |
| Roles / permissions | 2 to 3 roles | Granular RBAC |
| Monthly infra | 400 - 800 EUR/month | 1,000 - 1,500 EUR/month |
| Target SLA | Best effort | 99.9% contractual |
A 45,000 EUR MVP landing 20 customers at 90 EUR/month generates 21,600 EUR ARR: proof enough to raise or reinvest in the V1.
Cost breakdown of a 50,000 EUR MVP
Knowing where the money goes prevents paying twice for the same thing. 2026 order of magnitude for an average MVP:
| Item | Share | Amount (EUR) |
|---|---|---|
| Back-end + API development | 35% | 17,500 |
| Front-end development | 22% | 11,000 |
| Multi-tenant architecture + DevOps | 15% | 7,500 |
| Product design (UX/UI) | 12% | 6,000 |
| QA / automated tests | 8% | 4,000 |
| Payment integration (Stripe/Wave) | 5% | 2,500 |
| Project management | 3% | 1,500 |
Two items are non-negotiable: multi-tenant architecture (paying less here means rebuilding in 18 months) and automated QA (a SaaS without tests becomes impossible to maintain). Design can start lean; the foundation engineering cannot.
Recurring infrastructure cost
A SaaS is not a one-shot project: it costs every month. 2026 estimate by load:
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| Load | Active users | Infra/month (EUR) |
|---|---|---|
| Bootstrap | < 200 | 400 - 600 |
| Traction | 200 - 2,000 | 600 - 1,000 |
| Growth | 2,000 - 10,000 | 1,000 - 1,500 |
| Scale | > 10,000 | 1,500 - 4,000+ |
These cover hosting, managed database, storage, monitoring, backups and transactional emails. Budget them in the business plan: 60,000 EUR ARR with 18,000 EUR annual infra dramatically changes your margin.
Mini case study
Yanis, founder of a route-management SaaS for logistics SMBs in Nantes, hesitates between a full product and an MVP. He picks a 48,000 EUR MVP: scheduling, real-time tracking, subscription billing, delivered in 5 months. Infra: 650 EUR/month. He signs 28 customers at 129 EUR/month in 6 months, i.e. 43,344 EUR ARR. First-year total: 48,000 + (650 x 12) = 55,800 EUR. By month 14, ARR exceeds cumulative cost, and market proof lets him raise 300,000 EUR for the V1. A "complete" 180,000 EUR product would have delayed launch by 8 months, with no guarantee.
FAQ
What is the true minimum cost of a SaaS? In 2026, under 30,000 EUR you get a prototype, not a billable multi-tenant SaaS. The real floor for a commercializable MVP is around 30,000 to 40,000 EUR.
Must multi-tenant be coded from the MVP? Yes. Adding data isolation afterwards costs 2 to 3 times more than building it into the foundation. It is the one architectural item never to cut.
Can I start no-code to reduce the bill? To test an idea, yes. But beyond a few hundred paying users or API needs, no-code plateaus: plan migration to custom code in your roadmap.
What is a realistic MVP timeline? 4 to 6 months with a dedicated team. Under 4 months, you sacrifice QA or the multi-tenant foundation, which you pay for later.
What should I budget after launch? Expect 15 to 25% of the initial budget per year in evolutions, plus monthly infrastructure. A living SaaS gets maintained; a frozen one dies.
Let's scope your project. Tell us your value promise, your 3 core features and your target budget (MVP 30,000-80,000 EUR): we frame the multi-tenant scope and the infra plan. 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.
