The verdict in three sentences
A clean recurring-payment integration for a Toronto SaaS costs 6,000 to 20,000 EUR in 2026, depending on complexity (trials, upgrades, proration, dunning, tax). The real issue is not the PSP rate but involuntary churn: without retries, 5 to 10 % of subscribers drop each month on expired or declined cards. Well-designed dunning recovers 20 to 40 % of those failures, paying for the project on its own.
What the integration costs
The budget depends on billing sophistication: a simple flat subscription, or multiple plans with usage, proration and coupons. 2026 order-of-magnitude figures.
| Billing scope | Cost (EUR) | Timeline | Included |
|---|---|---|---|
| Flat single-plan subscription | 6,000 - 9,000 | 3-4 weeks | Trial, customer portal, invoices |
| Multi-plan + upgrades/proration | 9,000 - 14,000 | 4-6 weeks | Coupons, plan changes |
| Usage-based / metered | 14,000 - 20,000 | 6-8 weeks | Meters, thresholds, add-ons |
| Dunning + advanced retries | +2,000 - 4,000 | +1-2 weeks | Emails, smart retries |
| Tax compliance (multi-region) | +2,000 - 3,500 | +1 week | Regional rates, legal invoices |
On variable fees, the PSP takes its usual card rate (~1.4 % + 0.25 EUR) and a billing tool often adds 0.5 to 0.75 % above a free volume tier.
In-house build vs billing tool
| Criterion | In-house build | Stripe Billing | Chargebee |
|---|---|---|---|
| Upfront cost | 12,000 - 20,000 EUR | 6,000 - 12,000 EUR | 8,000 - 15,000 EUR |
| Recurring fees | 0 (but maintenance) | +0.5 - 0.7 % | Sub + 0.75 % above tier |
| Dunning included | To be built | Yes (Smart Retries) | Yes (advanced) |
| Tax handling | To be managed | Stripe Tax | Native multi-country |
| Time-to-market | Long | Fast | Fast |
| Best for | Very specific cases | 90 % of SaaS | Complex multi-country |
For most early-stage SaaS, Stripe Billing offers the best speed/cost ratio; Chargebee earns its place once multi-country tax and pricing models get complex.
The crux: involuntary churn
Involuntary churn (unwanted payment failures) is a huge share of SaaS losses. On 1,000 subscribers at 40 EUR/month, a 6 % monthly failure rate = 60 at-risk customers, i.e. 2,400 EUR/month at risk. Dunning with smart retries and email reminders recovers 20 to 40 %, saving 480 to 960 EUR/month without acquiring a single new customer.
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Mini case study
Julie, founder of a B2B SaaS in Toronto, has 1,500 subscribers at 45 EUR/month (MRR 67,500 EUR), with measured involuntary churn of 7 %.
- At-risk customers: 1,500 x 7 % = 105/month, i.e. 4,725 EUR/month at risk.
- Stripe Billing + dunning integration: 11,000 EUR (one-off).
- Dunning recovery at 30 %: 4,725 x 30 % = 1,417 EUR/month saved.
Payback: 11,000 / 1,417 = ~8 months, after which it is net recovered MRR every month (~17,000 EUR/year). Julie's best acquisition channel is simply not losing the customers she already has.
FAQ
How much does a recurring-payment integration cost in 2026? From 6,000 to 20,000 EUR by scope: a flat single-plan subscription starts at 6,000-9,000 EUR, a usage-based model with meters reaches 14,000-20,000 EUR.
Build in-house or use a billing tool? For 90 % of SaaS, a tool (Stripe Billing, Chargebee) is faster and cheaper mid-term. In-house (12,000-20,000 EUR) only makes sense for very specific billing cases.
What is dunning's impact on revenue? Well-designed dunning recovers 20 to 40 % of involuntary churn. On an MRR of 67,500 EUR with 7 % failures, that is up to ~1,400 EUR saved each month.
How do you handle tax on subscriptions? Via a tax engine (Stripe Tax or native Chargebee) that applies the right regional rate and generates compliant invoices. Budget +2,000 to 3,500 EUR for this component.
What fees come on top of the card rate? A billing tool often adds 0.5 to 0.75 % above a free tier, on top of the PSP card rate (~1.4 % + 0.25 EUR). Model this from the business plan.
Let's scope your project. Share your subscriber count, plan grid and needs (usage, multi-country tax, dunning) for a framing 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.
