Who this is for
A SaaS plan's financial section is an engine diagram: new MRR added monthly by acquisition, existing MRR eroded by churn or grown by expansion, and a cost base that burns until the curves cross. Plans that project revenue without modeling churn and acquisition mechanics are describing a different business model wearing SaaS pricing.
Use the generator for structure, then make the engine explicit: pricing tiers and the assumed mix, monthly churn with a stated basis, acquisition channel with cost per customer, and the resulting CAC payback in months. Those four assumptions generate the credible version of every other number in the plan.