I've helped build and ship around a dozen SaaS MVPs over the past few years. Some became real businesses. Most didn't. But every single one started with the same question: how much is this actually going to cost?

The answer is never simple, because there's the build cost (what you pay developers) and then there's the stack cost (what you pay monthly to keep the lights on). Most breakdowns I see online focus on one or the other. This article covers both — with real 2026 pricing pulled from actual vendor pages, not vibes.

We're talking about a typical B2B SaaS MVP. Think project management tool, CRM add-on, analytics dashboard, workflow automation — something with user auth, a subscription billing model, a database, and basic product analytics. The kind of thing two founders build in a garage, or a small agency builds in 8-12 weeks.

Let's get into the numbers.

Table of Contents

SaaS MVP Cost Breakdown 2026: Stripe, Supabase, Clerk & PostHog

The Reference MVP: What We're Pricing

To make this concrete, here's the MVP we're pricing out:

  • Type: B2B SaaS with team workspaces
  • Users at launch: 0-100 (first 3 months)
  • Scale target: 500-1,000 users by month 12
  • Features: User auth with SSO, role-based access, subscription billing (monthly/annual), a core feature dashboard, basic admin panel, product analytics, transactional emails
  • Frontend: Next.js (App Router)
  • Billing model: Monthly recurring revenue, per-seat pricing, free trial

This is the archetype. If you're building something roughly this shape, these numbers will be useful. If you're building a consumer app with 100k free users, your cost profile looks very different.

Development Costs: Agency vs Freelance vs In-House

Let's start with the big number — actually building the thing.

Approach Typical Cost (2026) Timeline Best For
Solo freelancer (senior) £8,000 - £20,000 / $10,000 - $25,000 8-16 weeks Tight budget, clear spec
Small agency (2-4 devs) £25,000 - £60,000 / $30,000 - $75,000 6-12 weeks Speed + quality balance
In-house hire (1 full-stack dev) £55,000 - £85,000/yr / $70,000 - $110,000/yr Ongoing Long-term product
Dev shop / outsourced team £15,000 - £40,000 / $18,000 - $50,000 8-14 weeks Budget optimization
No-code (Bubble, etc.) £2,000 - £8,000 / $2,500 - $10,000 2-6 weeks Validation only

These ranges are wide because scope varies enormously. A SaaS with three CRUD screens is not the same as one with real-time collaboration and a complex permissions model.

At Social Animal, our typical Next.js SaaS MVP engagement runs 8-12 weeks with a team of 2-3 developers. We use headless architecture — usually Next.js on the frontend with a headless CMS for marketing pages and Supabase or a custom API layer for the app itself. That approach keeps costs predictable because each layer has clear boundaries.

The key insight: your development cost is a one-time hit (roughly). Your stack cost is forever. A £40k build that costs £50/month to run is wildly different from a £20k build that costs £500/month.

The Modern SaaS Stack: Tool-by-Tool Breakdown

Here's the stack I'd recommend for most B2B SaaS MVPs shipping in 2026, with reasons:

Frontend:      Next.js 15 (App Router)
Auth:          Clerk or Supabase Auth
Database:      Supabase (PostgreSQL)
Billing:       Stripe Billing + Stripe Tax
Analytics:     PostHog
Email:         Resend
Hosting:       Vercel
Monitoring:    Sentry
CMS (marketing): Sanity or Contentful (for /blog, /pricing, etc.)

Let's price each one out.

SaaS MVP Cost Breakdown 2026: Stripe, Supabase, Clerk & PostHog - architecture

Authentication: Clerk vs Supabase Auth vs Auth0

Auth is the first thing your users touch and the last thing you want to get wrong. In 2026, there are three realistic options for an MVP.

Clerk

Clerk has become the default choice for Next.js SaaS apps, and honestly, it deserves it. The DX is exceptional — you get pre-built components, organization/team support, and SSO out of the box.

2026 Pricing:

  • Free: Up to 10,000 monthly active users (MAU)
  • Pro: $25/month + $0.02 per MAU beyond 10,000
  • Enterprise: Custom (typically $500+/month for SSO, SCIM, etc.)

For an MVP with under 1,000 users? It's free. That's hard to beat.

Supabase Auth

If you're already using Supabase for your database (and you probably should be), their auth is included. It supports email/password, magic links, OAuth providers, and basic RLS (Row Level Security) integration.

2026 Pricing:

  • Included with Supabase free tier (50,000 MAU)
  • Included with Supabase Pro ($25/month)

The trade-off: you'll build more UI yourself. No pre-built components like Clerk. But the price is right and the integration with your database is native.

Auth0 (Okta)

2026 Pricing:

  • Free: 25,000 MAU (recently increased)
  • Essentials: $35/month for 500 external users
  • Professional: $240/month

Auth0 is overkill for most MVPs. The pricing gets weird fast once you need advanced features, and the free tier has restrictions that'll bite you. I'd only go Auth0 if you have an enterprise compliance requirement from day one.

Feature Clerk Supabase Auth Auth0
Free tier MAU limit 10,000 50,000 25,000
Pre-built UI components ✅ Excellent ❌ DIY ✅ Good
Organization/team support ✅ Native ❌ Manual ✅ Native
SSO (SAML) Pro plan ❌ Professional
Next.js integration ✅ Best in class ✅ Good ✅ Good
Monthly cost at 500 users $0 $0 $0
Monthly cost at 5,000 users $0 $25 (Supabase Pro) $240+

My recommendation: Clerk if you want speed. Supabase Auth if you want simplicity and you're already on Supabase.

Database and Backend: Supabase vs PlanetScale vs Neon

For a B2B SaaS MVP, Supabase is the obvious starting point in 2026. It gives you PostgreSQL, realtime subscriptions, storage, edge functions, and auth — all in one dashboard.

Supabase Pricing (2026)

  • Free: 500MB database, 1GB storage, 2 projects
  • Pro: $25/month — 8GB database, 100GB storage, daily backups
  • Team: $599/month — SOC2 compliance, priority support

Most MVPs will be on the Pro plan within the first month. The free tier is fine for development, but the 500MB database limit and lack of daily backups make it unsuitable for production.

PlanetScale

PlanetScale pivoted to an enterprise-only model in 2024 and removed their free tier. Unless you specifically need MySQL with branching, I wouldn't start here for an MVP.

Neon

Neon is the serverless PostgreSQL option that's gained serious traction. Their free tier is genuinely generous — 0.5 GB storage, autoscaling to zero.

  • Free: 0.5GB storage, 190 compute hours
  • Launch: $19/month — 10GB storage
  • Scale: $69/month — 50GB storage, read replicas

Neon is great if you just need a database. But Supabase gives you the database plus everything else. For an MVP, that convenience matters.

Subscription Billing: Stripe Billing Deep Dive

This is non-negotiable. You're using Stripe. In 2026, there's nothing that comes close for a SaaS billing stack.

What Stripe Costs

  • Payment processing: 1.5% + 20p (UK) or 2.9% + 30¢ (US) per transaction
  • Stripe Billing: +0.5% for recurring billing features (invoicing, subscription management, proration, dunning)
  • Stripe Tax: +0.5% per transaction for automatic tax calculation
  • Stripe Radar (fraud): Included in base processing fee

So the all-in rate for a subscription SaaS with tax compliance:

UK: 2.5% + 20p per transaction US: 3.9% + 30¢ per transaction

What This Looks Like at Scale

MRR Monthly Stripe Fees (UK) Monthly Stripe Fees (US) Net Revenue (UK) Net Revenue (US)
£1,000 ~£30 ~$44 ~£970 ~$956
£5,000 ~£140 ~$210 ~£4,860 ~$4,790
£10,000 ~£270 ~$410 ~£9,730 ~$9,590
£50,000 ~£1,300 ~$2,000 ~£48,700 ~$48,000

Assumes average transaction of £50/$65 per seat per month.

The US rate is notably higher. If you're a UK-based SaaS selling primarily to US customers, you'll pay the customer's regional card rate, not yours. Something to factor in.

Implementation Tips

// Basic Stripe subscription setup with Next.js
import Stripe from 'stripe';

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!);

export async function createSubscription(
  customerId: string,
  priceId: string
) {
  const subscription = await stripe.subscriptions.create({
    customer: customerId,
    items: [{ price: priceId }],
    payment_behavior: 'default_incomplete',
    payment_settings: {
      save_default_payment_method: 'on_subscription',
    },
    expand: ['latest_invoice.payment_intent'],
    automatic_tax: { enabled: true }, // Stripe Tax
  });
  
  return subscription;
}

Don't forget: you'll also want Stripe webhooks to sync subscription state back to your database. Budget 2-3 days of development time for a proper webhook handler that covers invoice.paid, customer.subscription.updated, customer.subscription.deleted, and the various failure states.

Product Analytics: PostHog vs Mixpanel vs Amplitude

You need to understand what users are actually doing. Guessing is how MVPs die.

PostHog

PostHog has become my default recommendation for SaaS MVPs. It's open source, you can self-host it (saving money), and the cloud offering is genuinely generous.

2026 Pricing (Cloud):

  • Free: 1 million events/month, session replays (5,000/month), feature flags
  • Paid: $0.00031 per event beyond 1M

One million events per month is substantial for an MVP. You probably won't exceed this until you have thousands of active users.

Mixpanel

  • Free: 20 million events/month (they massively increased this)
  • Growth: From $28/month

Mixpanel's free tier is actually more generous on raw event volume. But PostHog includes session replays, feature flags, A/B testing, and surveys — all things you'd pay separately for with Mixpanel.

Amplitude

  • Free (Starter): 50,000 MTUs (monthly tracked users)
  • Plus: From $49/month
  • Growth: Custom pricing
Feature PostHog Mixpanel Amplitude
Free event limit 1M/month 20M/month 50K MTUs
Session replays ✅ Included ❌ ❌
Feature flags ✅ Included ❌ ✅ Basic
A/B testing ✅ Included ❌ ✅ Limited
Self-host option ✅ ❌ ❌
Best for All-in-one Pure analytics Enterprise

My recommendation: PostHog. It's not even close for an MVP. You get five tools in one.

Hosting and Deployment: Vercel vs Cloudflare vs Railway

If you're building with Next.js — and for a SaaS MVP in 2026, you should be — your hosting choice matters.

Vercel

  • Hobby: $0 (personal, non-commercial)
  • Pro: $20/user/month — the minimum for any commercial project
  • Enterprise: Custom

For a team of 2 developers, that's $40/month. You get preview deployments, edge functions, image optimization, and analytics. The Next.js integration is (unsurprisingly) perfect.

Cloudflare Pages

  • Free: Unlimited static pages, 100K function invocations/day
  • Pro: $20/month per domain

Cheaper, but Next.js support on Cloudflare is still maturing. You'll hit edge cases. For an Astro-based marketing site alongside your app, Cloudflare is excellent though.

Railway

  • Hobby: $5/month + usage
  • Pro: $20/month + usage

Railway is great if you need traditional server-side hosting — maybe for background jobs, cron tasks, or a separate API. Many SaaS MVPs use Vercel for the Next.js frontend and Railway for worker processes.

Total Monthly Stack Cost at Different Scales

Here's the full picture. This is what it actually costs to run the recommended stack:

Pre-Launch / Development Phase

Service Plan Monthly Cost
Clerk Free $0
Supabase Free $0
Stripe N/A (no transactions) $0
PostHog Free $0
Vercel Pro (2 devs) $40
Resend Free (100 emails/day) $0
Sentry Free (5K errors) $0
Domain + DNS Cloudflare $15/year
Total ~$41/month

Launch (0-100 Users, ~$2K MRR)

Service Plan Monthly Cost
Clerk Free $0
Supabase Pro $25
Stripe Billing fees ~$60
PostHog Free $0
Vercel Pro (2 devs) $40
Resend Pro (50K emails) $20
Sentry Team $26
Total ~$171/month

Growth (500-1,000 Users, ~$15K MRR)

Service Plan Monthly Cost
Clerk Pro $25 + usage
Supabase Pro $25
Stripe Billing fees ~$450
PostHog Free (likely still under 1M) $0
Vercel Pro (3 devs) $60
Resend Pro $20
Sentry Team $26
Total ~$606/month

Notice how Stripe fees become the dominant cost as you grow. At $15K MRR, you're paying roughly $450/month to Stripe. Everything else combined is around $156. This is why SaaS margins are so good — your infrastructure costs grow much slower than your revenue.

UK vs US: Pricing Differences That Catch You Off Guard

Most SaaS tools price in USD. If you're a UK-based founder, there are a few things to know:

  1. Stripe processing fees are lower in the UK — 1.5% + 20p vs 2.9% + 30¢. This is significant at scale.

  2. VAT on SaaS tools — You'll pay 20% VAT on most tools as a UK business. Supabase, Vercel, Clerk — they all charge VAT on top. A $25/month plan becomes ~$30. This adds up.

  3. Exchange rate risk — When GBP weakens against USD, your entire stack gets more expensive overnight. In 2025-2026, this has added roughly 5-10% to costs for UK founders.

  4. Stripe Atlas vs UK Ltd — Setting up a US entity via Stripe Atlas ($500 one-time) can make sense if most of your customers are US-based. But you'll need a US bank account and potentially a US tax filing. For a B2B SaaS primarily serving UK/EU customers, a standard UK Ltd is simpler and cheaper.

  5. UK developer rates are 15-25% lower — A senior full-stack developer in London costs £550-750/day. The equivalent in San Francisco runs $800-1,200/day. If you're outsourcing development, UK agencies offer strong value.

At Social Animal, we work with founders on both sides of the Atlantic. The stack recommendations are identical — it's the billing structure and compliance requirements that differ.

When to Spend More vs Stay Lean

Not all spending is equal. Here's where I'd invest early and where I'd stay cheap:

Worth paying for immediately:

  • A real database (Supabase Pro — $25/month for backups alone is worth it)
  • Error monitoring (Sentry — you need to know when things break)
  • A proper domain and SSL

Stay free/cheap until you have paying customers:

  • Analytics (PostHog free tier is generous)
  • Auth (Clerk free tier handles 10K users)
  • Email (Resend free tier handles 100/day)

Worth investing in development time:

  • Proper Stripe webhook handling (so billing state never gets out of sync)
  • Database migrations and seed scripts (so you can rebuild your dev environment in minutes)
  • CI/CD pipeline (even basic GitHub Actions saves hours per week)

Not worth building for an MVP:

  • Custom auth (just use Clerk or Supabase Auth)
  • Custom analytics (just use PostHog)
  • Custom billing portal (Stripe's hosted portal is perfectly fine)
  • Mobile apps (ship web first, always)

If you want to explore what a headless CMS approach can do for your marketing pages while keeping your app architecture clean, that's a pattern we use constantly for SaaS clients. Your marketing site and your app can share a codebase but have completely different content management workflows.

FAQ

How much does it cost to build a SaaS MVP in 2026? Total build cost for a B2B SaaS MVP ranges from £8,000 to £60,000 ($10,000 to $75,000) depending on whether you hire a freelancer, agency, or build in-house. The monthly running costs start at around $40/month pre-launch and scale to $150-600/month as you grow to 1,000 users. Development cost is the big variable — the stack itself is surprisingly affordable.

What's the cheapest way to build a SaaS product? The cheapest viable path is a solo developer using Next.js, Supabase (free tier), Clerk (free tier), Stripe, and PostHog (free tier), deployed on Vercel Pro ($20/month). Your total infrastructure cost can be under $50/month. The catch is development time — if you're building it yourself, factor in 3-6 months of your time. No-code tools like Bubble can be faster but create technical debt you'll need to address when scaling.

Is Stripe expensive for SaaS billing? Stripe charges 2.9% + 30¢ per transaction in the US, or 1.5% + 20p in the UK, plus 0.5% for Stripe Billing features. At $10K MRR, you're paying roughly $350-400/month in total Stripe fees. This is industry-standard pricing. Alternatives like Paddle or LemonSqueezy act as Merchant of Record (handling tax compliance for you) but charge 5-8%, which is significantly more. For most SaaS businesses, Stripe is the most cost-effective choice.

Should I use Supabase or Firebase for my SaaS MVP? For a B2B SaaS in 2026, Supabase is the better choice. It uses PostgreSQL (which you'll never outgrow), has better pricing for sustained workloads, includes auth and storage, and integrates well with modern frameworks like Next.js. Firebase is still solid for consumer apps with real-time requirements, but its NoSQL database (Firestore) becomes painful as your data model gets complex — and B2B SaaS data models always get complex.

What's the best analytics tool for a SaaS MVP? PostHog. It gives you event tracking, session replays, feature flags, A/B testing, and user surveys — all for free up to 1 million events per month. You'd need Mixpanel plus Hotjar plus LaunchDarkly plus Statsig to get the same feature set, and that would cost $200+/month. PostHog is also open source, so you can self-host it if you need to for data residency or compliance reasons.

How do UK SaaS costs compare to US SaaS costs? UK-based SaaS founders benefit from lower Stripe processing fees (1.5% vs 2.9%) and lower developer rates (roughly 15-25% less than US equivalents). However, they pay 20% VAT on most SaaS tools, and USD-denominated pricing means exchange rate fluctuations can increase costs by 5-10%. Net-net, building a SaaS MVP from the UK is usually 10-20% cheaper than building the same thing in the US.

When should I move from free tiers to paid plans? The moment you have paying customers. Free tiers lack backups, have limited support, and often throttle performance. Supabase Pro at $25/month gives you daily backups and better performance — that's non-negotiable once real money flows through your app. The exception is auth and analytics: Clerk's free tier handles 10,000 users and PostHog's free tier handles 1 million events. You probably won't outgrow those for 6-12 months.

Can I build a SaaS MVP with no-code tools? You can build a prototype or validation tool with Bubble, Webflow + Memberstack, or similar platforms. This works for testing demand and getting early sign-ups. But I'd strongly advise against launching a production B2B SaaS on no-code. The limitations hit fast — custom billing logic, complex permissions, API integrations, and performance optimization all become painful. Use no-code to validate the idea, then invest in a proper Next.js build for the real product.