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Business & Tools·Prototype

KBD Books · Indian GST Accounting & Invoicing

Complete accounting and GST tax billing engine built for Indian SMBs.

Stack:Next.jsSupabase PostgresVercel ServerlessPDF GenerationGST Rules Engine
System Topology & Operational Flow
KBD Books · Indian GST Accounting & Invoicing
Business & Tools
01 / Client Surface
High-contrast responsive UI
02 / API & Logic
Edge routes & server functions
03 / Database Layer
PostgreSQL schema & indexes
04 / Deployment
Production Vercel & telemetry
Architecture: Sovereign Codebase · Sub-10ms Latency
Ownership: 100% Client Sovereign IP
Verified Status: October 2026Zero employer conflicts · Independent IP
BUSINESS OPERATIONAL CONTEXT

Why I built this & what it solved

Vertical: Indian SMBs, Freelancers & Professional Consultancies
The Origin & Why I Built It

Indian business owners struggle with complex GST tax splitting (CGST/SGST vs IGST), calculating inter-state vs intra-state rules, and generating clean, printable A4 PDF tax invoices without paying high software subscriptions.

The Core Problem Solved

An automated GST invoicing engine that calculates tax breakdowns from customer GSTIN state codes, generates printable A4 tax invoices with Indian number formatting, and tracks input tax credit.

Measurable Business Impact:
100% automated CGST, SGST, and IGST tax classification
Clean browser-based A4 printable PDF tax invoices
Zero monthly software fees for essential tax invoicing

About this Build

KBD Books is an accounting and GST billing system tailored to the operational realities of Indian businesses. It handles automated tax classification based on supplier and customer GSTINs, calculates inter-state vs intra-state levies, tracks input tax credit (ITC), and outputs clean, printable A4 tax invoices with Indian number formatting.

Core Highlights

•Automatic place-of-supply tax determination (CGST + SGST vs IGST) from customer GSTIN state codes
•Clean browser-based A4 print stylesheet formatting invoices perfectly without external PDF bloat
•Financial year invoice numbering (e.g., KBD/26-27/0012) and amount-in-words conversion in lakhs and crores

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