The verdict in three sentences
Automating a B2B SaaS's subscription billing (proration, upgrades, dunning, EU VAT) costs between EUR 8,000 and 25,000 in 2026, depending on pricing-rule complexity. The real decision is in-house build on Stripe Billing vs a SaaS tool like Chargebee (EUR 250-600/month). Expect 4 to 8 weeks and fees of 0.5-0.9% of MRR on top of Stripe fees.
What a billing integration covers
| Function | 2026 range | Why it is critical |
|---|---|---|
| Subscriptions + proration | EUR 8,000 - 12,000 | Pro-rata upgrades/downgrades |
| Dunning (card failure retries) | +EUR 2,000 - 4,000 | Cuts involuntary churn |
| EU VAT (OSS) handling | +EUR 2,500 - 5,000 | One-stop-shop compliance |
| Multi-currency billing | +EUR 2,000 - 4,000 | International customers |
| Self-service customer portal | +EUR 3,000 - 6,000 | Reduces support load |
Dunning has the best ROI: 20-40% of card payment failures are involuntary (expired card, limit) and recoverable via automatic retry. Without it you leak MRR every month.
Build vs Chargebee: the switch point
| Criterion | In-house (Stripe Billing) | Chargebee / Recurly |
|---|---|---|
| Initial integration | EUR 8,000 - 25,000 | EUR 3,000 - 8,000 (setup) |
| Recurring cost | 0.5 - 0.9% MRR + Stripe | EUR 250 - 600/mo + % MRR |
| Timeline | 4 - 8 weeks | 2 - 4 weeks |
| Pricing flexibility | full | high (within tool limits) |
| EU VAT OSS / compliance | to build | native |
| Switch point | > 40 customers / high MRR | < 30-40 customers at start |
Below 30-40 customers, Chargebee gets you live faster with no technical debt. Beyond that, when MRR grows and the percentage taken exceeds a build's cost, an in-house Stripe Billing build becomes cost-effective and hands you back pricing control.
Mini case study
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Aoife, founder of a B2B SaaS in Dublin, 220 customers, EUR 55,000 MRR, 4 plans + add-ons, is undecided. Chargebee at her volume would cost ~EUR 450/month + 0.6% MRR = ~EUR 780/month (EUR 9,360/year). An in-house Stripe Billing build (proration + dunning + OSS + portal) is quoted at EUR 19,000, EUR 300/month support. Payback: the build breaks even in ~30 months versus Chargebee, but the dunning module alone recovers ~2.5% of MRR/month previously lost, about EUR 16,500/year. With that recovery, the project is profitable within year one.
FAQ
Is Stripe Billing enough on its own? For simple pricing, yes. Once you add fine-grained proration, add-ons, multi-country OSS VAT and a customer portal, you need an integration layer, which is where the EUR 8,000-25,000 budget sits.
How is EU VAT handled? Via the OSS one-stop shop: the system applies the customer-country rate for B2C, handles B2B reverse charge (validated VAT number) and produces the declaration reports.
What is dunning and why does it matter? It is automatic retry of failed payments (expired card, limit). It often recovers 20-40% of failures, MRR otherwise lost every month.
When to switch from Chargebee to an in-house build? When the percentage taken on a growing MRR durably exceeds a build plus support, generally beyond 40 customers and a meaningful MRR.
What fees come on top of integration? Stripe fees (EU card ~1.4% + EUR 0.25) plus 0.5-0.9% of MRR for the billing tool if used, plus support.
Let's scope your project. Send us your customer count, MRR, plans and VAT needs; we will settle build vs Chargebee with a costed indicative budget. 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.
