
Buy vs. Build in the AI Era: A 2026 Framework for Indie SaaS Founders Deciding on Financial Tooling
A five-factor framework — 36-month total cost of ownership, time to value, differentiation, integration, and compliance risk — for deciding which SaaS financial tooling to buy and which to build, with a worked example at $20,000 MRR where buying a billing engine costs roughly $25,000–$45,000 against $50,000–$100,000+ to build one.










