Free tools
GST & TDS tools for Indian businesses
Quick, accurate calculators — no login, no sign-up. They use the same money-precise engine that runs inside BillForge invoices, so the numbers match what you would file.
GST Calculator
Add or remove GST at 0/5/12/18/28% — with CGST+SGST vs IGST split.
Open toolReverse GST Calculator
Work out the base price and GST hidden inside a GST-inclusive amount.
Open toolTDS Calculator
TDS by section (194C/194J/194Q/194I) — with the 20% no-PAN rule.
Open toolGSTR-1 & 3B Due Dates
Next filing dates for monthly vs QRMP filers, FY 2026-27.
Open toolGSTIN Validator
Check a GSTIN's format and checksum, then decode state, PAN and entity type.
Open toolSAC Code Finder
Find the right SAC code and GST rate for common services.
Open toolE-Invoice (IRN) Checker
Does GST e-invoicing apply to you? Check against the ₹5 Cr threshold.
Open toolInvoice Number Checker
Check your invoice numbering format against GST Rule 46(b).
Open toolCompare BillForge with other tools
Honest, side-by-side comparisons on the compliance details that matter.
Stop calculating by hand.
BillForge creates GST-compliant invoices with the tax already worked out — gap-free Rule 46 numbering, GSTR-1 & 3B export, TDS certificates. Free for 3 months, no card needed.
Create GST-compliant invoices free