# How to Build a SaaS with Next.js in 2026 (Step by Step)

> A pragmatic walkthrough of shipping a production SaaS on Next.js 15 — auth, billing, a database and one real AI feature — without rebuilding the commodity plumbing.

- Author / publisher: make1day (company)
- Published: 2026-02-12
- Updated: 2026-11-07
- Canonical: /blog/build-saas-with-nextjs
- Category: Guide
- Tags: how to build a SaaS with Next.js, Next.js SaaS boilerplate, indie SaaS
- Language: en

Building a SaaS in 2026 still means solving the same 60% of commodity problems every founder hits: sign-up, a database, billing and a signed-in area. The difference between founders who ship and founders who stall is rarely the idea — it is how fast they stop rebuilding that 60%.

## Start with the 60% that is commodity

Every SaaS needs the same backbone: authentication, a database with row-level security, subscription billing with webhooks, a dashboard and a deployment story. None of these are your differentiator. Pay that toll once, with infrastructure you can read and change.

## Pick a stack that already has it

Next.js 15 (App Router) + TypeScript + Tailwind is the default for a reason: the tooling, hiring pool and examples already live there. Pair it with Supabase for auth and Postgres. For billing, decide early whether you want one gateway or a switchable layer — a global launch often needs a Merchant of Record plus a fallback provider. make1day ships six adapters (Waffo Pancake by default, plus Waffo Acquiring, Stripe, Creem, PayPal and Lemon Squeezy) behind one checkout and webhook contract.

## Add the one thing that is yours

The common mistake is over-building the demo. Ship ONE real AI feature behind auth and a plan gate — a streaming chat endpoint, document Q&A, a summariser — and leave the rest as honest scaffolding. Customers buy the 40% specific to them.

## Generate instead of deleting

If you know up front which modules you need, a configurator that prunes unselected code beats a starter you have to strip by hand. In make1day the Builder picks auth, gateway, AI providers, features, deploy target and visual style; the server returns a ZIP containing only those modules. Eighteen representative combinations are downloaded and type-checked in CI, and the ZIP is brand-free: our marketing pages and the generator itself are removed.

## Ship, then charge

Start from a free or preview tier, wire a test checkout, and only ask for money once customers get value. The scaffolding should take you from configuration to a deployed, billable app in an afternoon — not a quarter.

## FAQ

### How long does it take to build a SaaS with Next.js?

The commodity backbone (auth, database, billing, dashboard) is what takes weeks. With a starter it is an afternoon of configuration; the remaining time is your actual product, which no template can shorten.

### Do I need Supabase?

No. make1day switches between Supabase (auth + Postgres) and a local SQLite store depending on whether SUPABASE_SERVICE_ROLE_KEY is set. SQLite is for local development — the local auth path has no MFA, OAuth or session rotation, and does not persist on serverless.

### Which payment gateway should I start with?

If you sell globally without a company entity, a Merchant of Record such as Waffo Pancake or Lemon Squeezy removes tax handling. If you already have a Stripe account, use Stripe. The generated app keeps checkout and webhooks behind one provider-agnostic contract, so switching later is a config change.

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Source: make1day. See /llms.txt and /llms-full.txt for the full machine-readable product description.