You didn't go freelance to do bookkeeping.But every freelancer knows the 2 AM questions: Did that client ever pay me? How much should I keep for taxes? Am I even charging enough? And what do I actually send in each quarter?Freelance Finance OS answers all four with four ready-to-use spreadsheets (Excel and Google Sheets compatible — no macros, no add-ins, no subscriptions).THE INCOME & INVOICE TRACKER• Log invoices in seconds with client and status dropdowns (Draft / Sent / Paid / Cancelled)• Overdue invoices flag themselves automatically — in red• Dashboard: total invoiced, total collected, awaiting payment, overdue count and amount, month-by-month breakdown• Per-client totals: invoiced, paid, outstanding — see instantly who owes youTHE EXPENSE & TAX BUFFER TRACKER• Log expenses with category dropdowns; budgets per category• Enter your monthly income once — the dashboard computes profit, how much to move to your tax buffer account, and what's actually safe to keep• Set your own tax set-aside rate (25% default) — a saving discipline that prevents the April panicTHE FREELANCE RATE CALCULATOR• Work backwards from the take-home income you want to the minimum hourly / day / week rate you must charge• Reality-check table: how your required rate changes with your billable share (most freelancers overestimate it)• Quick project pricer: hours estimate + scope-creep buffer = minimum quoteTHE QUARTERLY TAX ESTIMATOR• Enter monthly income and deductible expenses, set your own estimated tax rate• See the estimated payment per deadline, what you already paid, and what remains• US 1040-ES payment periods prefilled correctly (they are uneven: Jan–Mar, Apr–May, Jun–Aug, Sep–Dec) — fully editable if you're elsewhereEVERY FILE INCLUDES• A "Start Here" sheet — set up in under 10 minutes• A clear legend: yellow cells are yours, everything else calculates itself• Realistic example rows showing exactly what to type• A Quick-Start PDF guide for the whole bundleWHO IT'S FOR — freelancers, consultants, and solo creators who want clarity without QuickBooks-level complexity.FORMAT — 4 x .xlsx (works in Excel 2010+, Google Sheets, LibreOffice) + 1 x PDF guide. Digital download, yours forever, free updates.Note: the tax buffer and the estimator are planning tools, not tax advice — confirm your rates with your accountant.Every tool in this shop is published with its verification — the full checked spec for this one lives at bytheloop.com/tools/freelance-finance-os. New from the same shop: the Freelance Money Prompt Pack (25 AI prompts, each with a tested example output) and How to Build an AI Agent That Runs a Real Business — the playbook behind this shop.