Start with the primary workflow
A SaaS MVP should be organized around the main thing users come to do. That could be managing bookings, tracking projects, analyzing data, sending proposals, automating documents, or collaborating with a team.
Build that workflow deeply enough that a real customer can complete it. Shallow versions of many features rarely teach you as much as a focused version of one important workflow.
Authentication and roles
Most SaaS products need secure sign up, sign in, password recovery, and role-based access. Even simple products often need at least an owner role and a team member role.
Be careful with permissions early. A messy permissions model can become expensive to fix later, especially when teams, clients, or admins need different access levels.
Billing only when it supports the test
Payments are essential if your MVP must test willingness to pay. In that case, include subscriptions, invoices, trials, or one-time payments. If the first test is workflow fit, you may begin with manual billing and add automation later.
The goal is not to avoid billing. The goal is to build the billing depth that matches the learning goal of the MVP.
Admin tools and support visibility
Early SaaS products need internal visibility. Admin tools help you view users, inspect records, handle support requests, correct mistakes, and understand where the product is breaking down.
These tools do not need to be beautiful in the first version, but they do need to be safe. They protect the customer experience while the product is still young.
Analytics and feedback
Add enough tracking to answer basic questions: who signs up, who activates, which steps are abandoned, and what users repeat. Pair numbers with user conversations so you understand the reason behind behavior.
A SaaS MVP should leave you with evidence. Without that evidence, the next feature decision becomes guesswork.