GST Calculator for Indian businesses
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April 14, 20261 min read
The problem
Small businesses in India regularly need quick GST math:
- Tax-exclusive to final amount
- Tax-inclusive back to taxable value
- CGST + SGST for intra-state, IGST for inter-state
Most teams still do this with ad-hoc calculators or spreadsheet formulas, which slows down billing and increases errors.
What I built
I shipped a web-based GST Calculator with:
- Forward calculation (exclusive and inclusive flows)
- Reverse calculation from inclusive total or GST amount
- State-based supply type logic (intra vs inter)
- Itemized bill generator with live totals
- Copyable invoice summary text
To keep the live version private while this portfolio is in progress, I added a simple password gate before users can access the web app.
Result
The app now gives an immediate, clean breakdown of taxable value, GST components, and grand total. It also serves as the first production-grade project in this portfolio's `Work` section.