GST Calculators Tools
Free gst calculators grouped in one place.
GSTIN Validator: Verify GST Number Format
GSTIN Validator is a free online tool that checks whether a Goods and Services Tax Identification Number is structurally valid — verifying the 15-character format, embedded PAN, state code, and mod-36 checksum instantly in your browser. Built for accountants, freelancers, and business owners who need to catch typos and fake GSTINs before an invoice, vendor onboarding, or ITC claim goes wrong.
RCM Applicability Checker (GST) — Section 9(3)/9(4)
Instantly check if GST reverse charge (RCM) applies under Section 9(3) or 9(4) of the CGST Act — get the verdict with the exact notification reference.
GST Registration Trigger Checker
Check if you must register for GST — instantly compares your turnover against ₹40L/₹20L/₹10L thresholds and flags Section 24 compulsory triggers like e-commerce sales.
freelancer income tax and GST calculator
A free online tool for Indian freelancers and specified professionals to calculate three things at once: Section 44ADA presumptive taxable income, slab-wise income tax for FY 2026-27 (AY 2027-28) under the old or new regime, and whether GST registration is mandatory based on the ₹20 lakh (₹10 lakh special category) threshold. Covers the enhanced ₹75 lakh 44ADA limit for freelancers with 95%+ digital receipts, Section 87A rebate, and 4% Health & Education Cess.
GST Late Fee Calculator — Section 47 CGST Act
An online calculator to compute GST late fees for delayed GSTR-3B and GSTR-1 filings under Section 47 of the CGST Act, 2017. Covers regular and Nil returns, turnover-based fee caps, CGST/SGST split, and optional Section 50 interest on delayed tax payment.