Tax • SGST • CGST • IGST

GST Calculator

Calculate GST, SGST, and CGST. Add or remove tax from prices instantly.

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GST Quick Guide

GST is India's unified indirect tax system. It has 5 slabs (0%, 5%, 12%, 18%, 28%) depending on product type. For intra-state sales, GST is split into CGST (Central) and SGST (State). For inter-state sales, use IGST (Integrated GST). Key formulas: Add GST: GST Amount = (Base Price × Rate) / 100 | Remove GST: Base Price = Final Price / (1 + Rate/100).

Common GST Rates

  • 0%: Essential goods, food, education, healthcare
  • 5%: Packaged foods, basic items, non-AC restaurants
  • 12%: Processed foods, electronics, medicines
  • 18%: Most services, AC restaurants, apparel
  • 28%: Luxury goods, alcohol, tobacco, high-end vehicles

Key Concepts

  • ITC: Claim tax paid on purchases against sales tax
  • Registration: Mandatory at ₹40L (goods) or ₹20L (services) turnover
  • CGST+SGST: Use for same-state sales
  • IGST: Use for inter-state sales
  • E-invoicing: Required for business turnover > ₹5 crore

Registration: Mandatory if turnover > ₹40 lakh (goods) or ₹20 lakh (services). Apply on gst.gov.in with PAN, Aadhaar, bank details, and address proof. Get your 15-digit GSTIN. Composition Scheme: Small businesses (< ₹1.5C turnover) can opt for flat 1-6% rates without claiming ITC, simplifying compliance.

Return Filing: File GSTR-1 (sales) by 11th of next month, GSTR-3B (summary) by 20th of next month. Missing deadlines incurs ₹50/day penalty up to ₹10,000 per return, plus 18% interest on unpaid tax.

Frequently Asked Questions

What's the difference between CGST, SGST, and IGST?

CGST + SGST (Intra-State): Used when buyer and seller are in the same state. 18% GST is split 9% CGST (Central) + 9% SGST (State). IGST (Inter-State): Used when buyer and seller are in different states or for imports. The entire 18% is charged as IGST. Key Rule: Check buyer's GSTIN state. Same state = CGST+SGST. Different state = IGST.

How do I claim Input Tax Credit (ITC)?

ITC reduces your GST liability. When you buy goods/services for business, you pay GST (input tax). When you sell, you collect GST (output tax). Pay government only the difference: Output Tax - Input Tax. Requirements: (1) Be GST-registered. (2) Have valid tax invoices from suppliers. (3) Supplier must have filed GSTR-1 and paid tax. (4) Your purchases appear in GSTR-2A/2B. (5) Claim ITC in GSTR-3B monthly return. Blocked ITC: Personal vehicles, food/beverages, club memberships—no credit available.

Do I need GST registration if my turnover is below ₹40 lakh?

Mandatory thresholds: ₹40 lakh (goods) or ₹20 lakh (services). Mandatory regardless of amount: Inter-state sales, e-commerce sellers, or import/export. Voluntary registration benefits: Claim ITC, improve credibility with B2B buyers, prepare for future growth. Composition Scheme: Small businesses (< ₹1.5 crore) can pay flat 1-6% rates without ITC, simplifying compliance. Choose regular scheme if your input credit exceeds composition tax rate.

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