Build a GST Invoice Parser in 70 Lines of Python

Short summary

Practical Python automation for extracting GSTIN, invoice numbers, dates, and tax components (CGST/SGST/IGST) from vendor invoice PDFs. Uses regex and pdfplumber to validate GSTIN format, catch tax arithmetic errors, and generate clean CSV export — all in 70 lines, no API costs. Digitally-generated invoices process in seconds; scanned invoices need OCR.

• •Extracts GSTIN, invoice numbers, dates, and GST tax components from PDFs using regex and pdfplumber
• •Validates GSTIN format and flags tax mismatches to catch data-entry errors automatically
• •Processes digitally-generated invoices in seconds with zero API costs; scanned invoices require OCR

Generated with AI, which can make mistakes.