Freelancer Finance OS is a complete Excel workbook for freelancers and one-person businesses: track income and expenses, manage invoices and clients, and estimate taxes — all in one file.

WHAT'S INSIDE (10 sheets):

- Dashboard with year selector and charts

- Income and Expenses trackers with input validation

- Invoice manager: subtotal and tax rate in, tax amount, total, outstanding balance and aging calculated automatically, with overdue highlighting

- Client manager with per-client income summary

- Tax estimate sheet (annual and monthly) with adjustable rates in Settings

- Beginner-friendly Guide and a Cover sheet

DETAILS:

- No macros, works in Excel 2016 and newer

- Formula cells are locked and sheets protected (no password) so calculations can't break by accident

- Yellow cells are the only inputs; add rows without breaking calculations

- Includes realistic fictional sample data (18 income, 17 expenses, 10 invoices, 8 clients) so you can see it working before entering your own numbers

You get an instant-download .xlsx file.