Template Logic started with a problem that most financial templates have: they work in the demo and break in real life. The zero-based budget that doesn’t know what to do when you overspend a category. The rental model that ignores cleaning costs. The FBA calculator that skips returns.
Each template here was built to solve a specific problem I ran into. The Airbnb model came from managing a portfolio with no clean way to see per-property margin after every cost. The KDP calculator came from not knowing which books actually made money once ads were factored in.
The rule: if a template doesn’t change a real financial decision, it doesn’t get built. These are the spreadsheets I use, sold to people who want the same clarity without building from scratch.
— Built by one person. Tested against real portfolios, real businesses, real numbers.
The principles behind every template in the catalogue.
Every cell earns its place. If a formula doesn’t improve a decision, it’s cut. Documentation tells you exactly what each input controls and why.
No cloud connections, no bank links, no sync. You paste your numbers into a local file and nothing leaves your machine.
Sinking funds go negative. Tenants miss rent. Expenses drift past budget. Templates that assume clean inputs are demos. These handle the mess.
Every sheet ships with documentation explaining the logic, assumptions and edge cases. You should be able to audit every number yourself.
Updated when rules change — FBA fees, KDP print costs, Etsy fee layers — at no extra charge.
A template that tries to do everything does nothing well. Each model is scoped to one financial decision and goes deep.
18 templates across 6 categories. Buy individually or get everything in one go.
