Tools
Calculators that show their working
Every tool here computes from a single source of truth for rates and thresholds, and prints the arithmetic underneath the answer — so you can see how the number was reached, check it, and take it to your professional. None of them are tax advice.
GST
GST Amount Calculator
From an amount with or without GST, split into CGST + SGST (intra-state) or IGST (inter-state).
How much GST is on this supply, and what's the total?
GST
Late Fee & Interest Calculator
Per-day late fee capped by your turnover tier, plus 18% interest on the net cash tax paid late.
What does a missed GST due date actually cost?
Income tax
TDS Rate Finder
Interest, contracts, rent, professional fees, property purchases — the threshold check and the exact deduction.
Which section, what rate, and how much to deduct?
Income tax
Which ITR Should I File?
Five questions, one answer, with the reasons spelled out — simple forms are capped at ₹50 lakh.
ITR-1 through ITR-7 — which one is yours?
GST
HSN & SAC Code Lookup
A curated, searchable subset of the most common goods (HSN) and services (SAC) codes.
What GST rate applies to this code or description?
Behind the scenes: the arithmetic lives in pure functions under lib/calc, tested with npm test. Rates and thresholds live in the data files there — when a Finance Act changes them, one edit updates every tool.
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