The verdict in three sentences
A B2B e-commerce store does not just cost its initial build of EUR 25,000-60,000: over three years, the total cost of ownership (TCO) climbs to EUR 90,000-180,000 once you add hosting, maintenance, payment and marketing. Annual maintenance (15-20 % of the build) and marketing are the two lines that blow up poorly planned budgets. Setting aside a recurring annual budget of EUR 25,000-50,000 from year 1 avoids nasty surprises and protects ROI.
Breaking down TCO over three years
TCO aggregates all direct and indirect costs over the platform's lifetime. Here is the breakdown for a mid-range Singapore B2B store (500 SKUs, pro accounts, online payment).
| Line item | Initial cost (yr 1) | Annual recurring | 3-year total |
|---|---|---|---|
| Platform build | EUR 25,000-60,000 | — | EUR 25,000-60,000 |
| Managed hosting | EUR 1,200-6,000 | EUR 1,200-6,000 | EUR 3,600-18,000 |
| Maintenance & upgrades | — | EUR 3,750-12,000 | EUR 11,250-36,000 |
| Payment fees (1.4 %) | volume-based | volume-based | EUR 8,400-25,200 |
| Marketing & acquisition | EUR 8,000-20,000 | EUR 8,000-20,000 | EUR 24,000-60,000 |
| Licenses & SaaS tools | EUR 1,500-4,000 | EUR 1,500-4,000 | EUR 4,500-12,000 |
| Cumulative TCO | — | — | EUR 90,000-180,000 |
Payment fees assume online revenue of EUR 200,000-600,000/year at 1.4 % per transaction. 2026 order of magnitude, excluding premium options.
The hidden costs that wreck the budget
It is rarely the visible lines that blow up a B2B e-commerce budget, but the hidden costs underestimated during scoping.
| Hidden cost | 2026 range | Frequency |
|---|---|---|
| Catalog & data migration | EUR 3,000-10,000 | One-off |
| ERP / accounting integration | EUR 5,000-18,000 | One-off + maintenance |
| Team training | EUR 1,500-4,500 | Year 1 |
| SSL & advanced security | EUR 500-2,000/year | Recurring |
| Partial redesign (yr 2-3) | EUR 8,000-20,000 | Occasional |
| Priority support | EUR 2,400-7,200/year | Optional |
One tip: locking the functional scope in the specification cuts unplanned upgrade spend by 20-30 %.
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Mini case study
Jason, managing director of an industrial supplies distributor in Singapore (14 staff), launches his B2B store. Build at EUR 42,000, managed hosting at EUR 3,600/year, maintenance at 18 % or EUR 7,560/year, and a target online revenue of EUR 350,000/year generating EUR 4,900/year in payment fees. Over three years, his TCO reaches about EUR 116,000. By shifting 30 % of phone orders to self-service, he saves 1.5 admin FTE (about EUR 54,000/year): the platform pays for itself by the middle of year 2.
FAQ
What recurring annual budget should I plan after the build? Expect EUR 25,000-50,000/year covering hosting, maintenance (15-20 % of the build), payment and marketing. It is the line most often forgotten in initial quotes.
Is 15-20 % maintenance negotiable? It matches a 2026 market standard covering security, updates and small upgrades. Below 12 %, the risk of technical debt and security flaws rises sharply.
What do payment fees really cost in B2B? Around 1.4 % per card transaction, but bank transfer (often dominant in B2B) cuts this to 0.2-0.5 %. On EUR 400,000 of revenue, that is EUR 800-5,600/year depending on the mix.
Can the build be phased to smooth the cost? Yes, splitting into 2-3 lots (MVP then upgrades) spreads spend over 12-18 months without exceeding +8-12 % of total overhead linked to handovers between lots.
How long until the platform is amortized? With 25-35 % of orders shifted to self-service, payback lands between 14 and 24 months for a mid-sized distribution SME.
Let's scope your project. Give us your target online revenue, your SKU count and the ERP integration you need: we will cost your real 3-year TCO. 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.
