Automated Invoicing System

Smart Invoicing Assistant — Automated Email-to-Spreadsheet Accounting with AI (n8n)

Overview

Say goodbye to manual invoice tracking. This powerful automation system fetches incoming emails, filters for receipts, bills, or payment confirmations, and uses OCR + AI logic to extract relevant data—then logs everything neatly into Google Sheets. Perfect for freelancers, small businesses, and finance teams who want a zero-touch, always-on invoicing solution.

What It Does

1. Reads Emails Automatically – Connects to your Gmail and polls for new messages every hour.
2. Filters for Financial Emails – Only processes emails with keywords like invoice, receipt, payment, and ensures attachments are present.
3. Performs OCR on Attachments – Extracts text from images or PDFs (like scanned receipts) using a built-in Tesseract OCR engine.
4. Parses & Classifies – Extracts key details: amount, source, currency, date, and assigns categories like Credit or Debit.
5. Logs to Google Sheets – Appends structured data to your specified spreadsheet in real-time—no duplicates, no clutter.
6. Error Handling Built-In – Isolates failed parsing attempts for follow-up and debugging.

Tech Stack

• Built on n8n (self-hosted or cloud)
• Uses Gmail API, Google Sheets, Tesseract OCR, and a custom AI parser
• Works with free AI models (e.g. Groq/LLM-compatible) to enhance parsing logic
• Fully customizable & extendable

Who It’s For

• Digital agencies handling client transactions
• Solopreneurs tracking expenses and payments
• Finance teams automating bookkeeping
• Anyone tired of chasing scattered invoice emails