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Generates flawless GST invoices instantly. Add GST on top of your quotes or reverse-engineer hidden GST out of an MRP bill. Computes CGST, SGST, and IGST mapping.
Adds the GST component on top of an arbitrary Base Price.
Total Invoice Value
₹1,18,000
Final billing amount
GST Added
₹18,000
Tax flow to Govt
Base Value
₹1,00,000
Pre-tax price
Effective Rate
18%
Mapped slab
Or simply charge 100% as IGST (18%) if the transaction crosses state borders.
Total = Base + (Base × Rate / 100)
Used when generating a fresh invoice from a base quote.
Base = Total / (1 + Rate / 100)
Used when extracting the tax out of an MRP price tag.
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Book Free ConsultationThe Goods and Services Tax (GST) is India's unified indirect tax system that replaced 17 separate taxes (VAT, Service Tax, Excise Duty, etc.) on July 1, 2017. It operates on the principle of ‘Destination-Based Taxation’ — tax is collected by the state where the goods/services are consumed, not where they are produced. Understanding GST mechanics is critical for every business owner, freelancer, and CA.
Generate correct invoices with CGST/SGST or IGST split. Verify your billing software's calculations against this engine.
Calculate exact GST on your consulting invoices. Understand LUT for export services and ITC refund eligibility.
Quick client-facing calculator for verifying GST on complex transactions. Useful for inclusive-to-exclusive reverse calculations.
Extract hidden GST from MRP prices. Understand how much of your purchase goes to the government as indirect tax.
Essentials: Fresh fruits & vegetables, milk, bread, educational services, healthcare services, books, non-AC train travel, religious pilgrimage.
Essential items: Apparels under ₹1,000, unbranded packaged food, affordable restaurant dining, domestic transport, economy air tickets, small restaurants.
Standard items: Computers, processed food, business class air tickets, standard hotel rooms (₹1K-₹7.5K), frozen foods, fruit juices, sewing machines.
The Universal Rate: 90% of all Services, Software, Telecom, electronics, capital goods, branded garments, restaurants in hotels with ₹7.5K+ tariff, financial services, insurance.
Sin & Luxury Goods: Automobiles, aerated drinks, tobacco, 5-star hotel stays (₹7.5K+), betting, racing, luxury cement/tiles, washing machines, ACs, dishwashers.
ITC is what makes GST fundamentally different from the old tax regime. It eliminates the “cascading effect” (tax-on-tax) by allowing businesses to offset the GST they paid on purchases against the GST they collect on sales.
ITC Mechanism:
GST Collected on Sales (Output Tax): ₹18,000
GST Paid on Purchases (Input Tax): ₹12,000
Net GST Payable to Govt: ₹18,000 - ₹12,000 = ₹6,000
Late filing penalty: ₹50/day (₹25 CGST + ₹25 SGST) for regular returns, ₹20/day for Nil returns. Maximum capped at ₹5,000 per return.
A Mumbai-based skincare brand shipping to customers across India
Sells a ₹1,000 product (net of GST) with 18% GST. Ships to customers in Maharashtra (intra-state) and Karnataka (inter-state).
💡 Intra-state: Invoice shows ₹1,000 + ₹90 CGST + ₹90 SGST = ₹1,180. Inter-state: Invoice shows ₹1,000 + ₹180 IGST = ₹1,180. The total invoice is the same — only the tax split changes.
A Bangalore-based developer working for US SaaS clients
Earns ₹30L/year from US clients. Must register for GST (export of services). Applies for LUT (Letter of Undertaking) to claim 0% GST on exports.
💡 GST on export services = 0% (under LUT). But the developer can claim ITC refund on GST paid for laptop (₹1,800/₹1L), internet (₹270/₹1.5K), coworking space (₹5,400/₹30K). Total ITC refund claim: ~₹7,470/month!
A small dhaba in Jaipur with ₹80L annual turnover
Opts for Composition Scheme at 5% flat rate. No complicated invoice-level GST calculation needed.
💡 Total quarterly GST = 5% × ₹20L = ₹1,00,000. Files simple CMP-08 return quarterly. But cannot give GST credit to corporate customers ordering catering — they lose ITC, making the dhaba less attractive for B2B catering.
1% of Turnover
Manufacturers & Traders
Turnover ≤ ₹1.5 Cr
5% of Turnover
Restaurants (Non-AC)
Turnover ≤ ₹1.5 Cr
6% of Turnover
Service Providers
Turnover ≤ ₹50 Lakhs
Restrictions: Cannot make inter-state sales, cannot collect GST on invoices (customers lose ITC), cannot claim ITC on purchases, cannot supply via e-commerce platforms, and cannot deal in ice cream, pan masala, or tobacco products.
Best for: Local retail shops, neighborhood restaurants, small manufacturers selling only within their state to end consumers.
Governing Law: Central Goods and Services Tax Act, 2017 (CGST Act), Integrated Goods and Services Tax Act, 2017 (IGST Act), and respective State GST Acts. Rates are set by the GST Council, chaired by the Union Finance Minister.
Registration Threshold: Mandatory for turnover exceeding ₹20 Lakhs (₹10 Lakhs for NE and special category states). Mandatory regardless of turnover for: inter-state suppliers, e-commerce operators, casual/non-resident taxable persons, and persons liable for reverse charge.
E-Invoicing: Mandatory for businesses with turnover exceeding ₹5 Crore (from August 2023). E-invoices must be generated on the Invoice Registration Portal (IRP) and carry an IRN (Invoice Reference Number) and QR code.
Disclaimer: GST rates are subject to change based on GST Council notifications. This calculator uses standard rates as of FY 2026-27. For industry-specific or product-specific rate queries, use the HSN/SAC code lookup on cbic-gst.gov.in.
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