The build quote is 60–70% of what your SaaS will actually cost in year one. The remaining 30–40% hides in infrastructure, third-party services, compliance, and post-launch iteration — and almost no agency itemizes it, because the agency doesn't pay it. You do.
After 600+ projects at Teamseven, I can predict with uncomfortable accuracy which invoice will surprise a founder in month four. This post is that list, with real numbers, so you can budget for the product you're actually launching — not just the one being built.
The recurring costs (your new monthly bills)
| Cost | Typical monthly range (early stage) | Notes |
|---|---|---|
| Cloud hosting (AWS/Azure/GCP) | $50–$400 | Scales with users; a misconfigured environment can 5x this overnight |
| Database hosting | $0–$150 | Managed MongoDB/Postgres tiers jump sharply past free tier |
| Transactional email | $15–$100 | Postmark, SendGrid — priced per email, grows with signups |
| Error tracking & monitoring | $0–$80 | Sentry, uptime monitoring, log retention |
| Payment processing | 2.9% + 30¢/txn + 0.5–0.7% for billing platform | Stripe Billing or Paddle take their cut on top of card fees |
| Domain, SSL, DNS, CDN | $5–$50 | Small but eternal |
| Third-party APIs | $0–$500+ | Maps, SMS (Twilio), AI/LLM calls, address lookup — the silent budget killer |
| Backups & disaster recovery | $10–$60 | If this line is $0, your real cost is "the business" |
Early-stage total: $150–$800/month before a single salary. For AI-feature-heavy products, LLM API costs alone can exceed everything else combined — we've seen founders ship an AI feature priced at $29/month that cost $40/user/month in tokens. Model your unit economics before the feature ships, not after.
The one-off costs that ambush you
1. App store fees and review cycles. $99/year (Apple) and $25 (Google) are trivial; the two-week review delays and forced rework when policies change are not.
2. Compliance, when your first big customer asks. The MVP didn't need a GDPR data-processing agreement, a pen test report, or SOC 2 answers. Your first enterprise prospect's procurement team will need all three. Budget $3k–$15k when that day comes — and it comes faster for healthcare and fintech. When we built COMPASS, a clinical research platform for Ball State University, HIPAA requirements shaped the architecture from day one; retrofitting compliance later costs multiples of building it in.
3. The integrations your customers assume exist. "Does it sync with Xero?" Every vertical has its non-negotiable integration. Each one is typically $2k–$8k of real engineering, plus ongoing maintenance when the third party changes its API — which they do, on their schedule, not yours.
4. The post-launch 90 days. Real users break assumptions within hours. Budget 15–20% of the build cost for the first three months of fixes, onboarding friction removal, and small pivots. Teams that don't budget this either ship a stagnant product or burn goodwill with their dev partner.
5. The rebuild tax. The most expensive hidden cost of all. A $12k MVP built on shaky foundations becomes a $50k rebuild in year two — you pay for the product twice and lose a year. This is the math behind our build-quality argument in the MVP cost guide, and it's why "cheap" and "low-cost" are different words.
The costs that aren't money
- Founder time on support. Every UX shortcut becomes a support ticket, and every ticket is your evening.
- Vendor lock-in. If your agency owns the repo, the servers, or the Stripe account, your switching cost is effectively a ransom. We hand over everything — code, infrastructure, IP — as a contractual default. Ask any partner to do the same in writing.
- Decision debt. Choosing "we'll decide the pricing model later" costs nothing today and a re-architecture next year. Billing logic is load-bearing.
How to budget honestly: the 100/30/20 rule
For every $100 of build cost, reserve roughly $30 for year-one operating costs (the recurring table above plus one compliance or integration surprise) and $20 for post-launch iteration. A "$40k MVP" is a $60k year-one commitment. Founders who plan that number from the start make calmer decisions all year — and calm founders ship better products.
FAQ
What's the single most underestimated cost? Third-party API consumption — especially LLM tokens and SMS. They scale with success, which means your best month can also be your scariest invoice.
Can I reduce hosting costs at the start? Yes — a properly configured single-region setup on managed services comfortably serves your first thousands of users for under $200/month. Premature "scale-ready" Kubernetes setups burn money on traffic you don't have yet.
Should maintenance be a retainer or pay-as-you-go? For a live product with paying customers, a retainer ($2k–$5k/month depending on scope) buys response-time guarantees. Pay-as-you-go means you queue behind retainer clients — including ours.
Do you include these costs in your proposals? We itemize the build fixed-price and attach a projected operating-cost sheet for year one. No founder should learn about Stripe Billing fees from their first payout.
Related reading
- How Much Does It Cost to Build a SaaS MVP in 2026?
- No-Code vs Custom Development: An Honest Decision Guide
- SaaS Application Development Services
Want a year-one cost projection for your product idea, not just a build quote? Book a free 30-minute scoping call — fixed-price proposal within 48 hours.