How to Build a Complete Billing & Inventory System in Google Sheets - E47

Build a complete Billing & Inventory Management System in Google Sheets using Google Apps Script — 100% FREE, no hosting, no database costs. This is the only tutorial you need for a professional billing system in 2026. In this step-by-step tutorial, I'll show you how to build a full-featured business management web app that runs entirely on Google Sheets. Whether you're a small business owner tired of paper invoices, a freelancer building client systems, or a developer learning Google Apps Script — this project covers everything. By the end of this video, you'll have a production-ready system with invoicing, inventory tracking, purchase orders, payment management, expense tracking, returns/credit notes, financial ledger, 5 report types, and 10 email automations — all with role-based access control and a mobile-responsive dashboard. No external hosting needed — deploy it as a free Google Apps Script web app. I've personally delivered 300+ custom dashboards and automation projects. This system is built with the same patterns I use for paying clients. If you're looking for a Google Sheets CRM or customer management system, check out my other tutorials on the channel. 🔑 Key Features You'll Build: ✅ Login with Forgot Password ✅ Product Management ✅ Invoice System (Invoice / Proforma / Quotation) ✅ Duplicate Invoice ✅ Purchase Orders ✅ Payment Tracking (In & Out) ✅ Returns & Credit Notes ✅ Expense Tracking ✅ Customer Return History & Ledger View ✅ Financial Ledger with Date Filtering ✅ Overdue Invoice Reminders ✅ Low Stock & Daily Sales Email Alerts ✅ App Settings (Currency, Logo, App Name) ✅ Role-Based Access (Admin / User) ✅ CSV / PDF / Print Export ✅ Printable Order Sheets for Salespeople ✅ Activity Logs & Audit Trail ✅ Source Code : https://rameezscripts.com/code_file.p... 💼 NEED CUSTOM SOLUTIONS? 🔧 What I Build: ✔️ Google Sheets-based ERP & Business Systems ✔️ Google Workspace Integrations ✔️ Full-Stack Web Apps (React + Apps Script) 📩 Let's Work Together: 💬 WhatsApp: https://wa.me/923224083545 Videos You Might Like: Trolley Management System | Build Complete Web Dashboard with Google Sheets & Apps Script | E20    • Build a Complete Trolley Management System...   Advanced Records Management System - React + Google Apps Script | Full Stack Project | E21    • Admin Dashboard with Google Apps Script & ...   FREE Budget Tracker App with Google Sheets & React 18 | Complete Tutorial 2026 | E22    • FREE Budget Tracker App with Google Sheets...   Google Sheets Student Result Portal with Apps Script [Complete Tutorial 2026] | E23    • Build Student Portal in 5 Minutes | Google...   Build Complete Vehicle Payment System Using Google Apps Script & React | Free Template | E24    • How to Build Vehicle Payment System in Goo...   How to Make a Client Management Dashboard in Google Sheets | Invoice System with Apps Script | E25    • How to Build a Complete Business Managemen...   How to Create Multi-Step Form with Google Sheets & Apps Script 2026 | React Web App Tutorial | E26    • How to Create Multi-Step Form with Google ...   How to Build a CMS (Cheque Management System) with Google Sheets & Google Apps Script | E27    • How to Build a CMS (Cheque Management Syst...   FREE Lottery Management System with Google Apps Script & React Dashboard | Full Web App | E28    • FREE Lottery Management System with Google...   Transport Management System using Google Sheets | Fleet Management Dashboard with Apps Script E29    • How to Build a Fleet Management System in ...   Hashtags : #GoogleSheets #AppsScript #BillingSystem #InventoryManagement #GoogleSheetsAutomation #FreeTemplate #InvoiceSystem #SmallBusiness #RameezScripts ⚠️DISCLAIMER This content is for educational purposes. Please follow Google's Terms of Service and best practices when implementing solutions in production environments. Test thoroughly before using in live business operations. 👨‍💻 ABOUT THE CREATOR Created by Rameez Imdad | Rameez Scripts ( 3 Years Experinece )