GST replaced 17 indirect taxes with one unified system.
GST Slabs
0%: Essential items. 5%: Mass consumption. 12%: Standard goods. 18%: Most services. 28%: Luxury/demerit goods. Use our [GST Calculator](/calculators/gst-calculator).
Input Tax Credit
Manufacturer buys materials for ₹100+₹18 GST. Sells for ₹200+₹36 GST. Pays only ₹36-₹18=₹18 (tax on value added).
Types
CGST+SGST for intra-state (split equally). IGST for inter-state (full rate).
Registration
Mandatory if turnover >₹40L (₹20L for services/special states). Also required for inter-state supply and e-commerce.
Filing
GSTR-1 (outward): 11th of next month. GSTR-3B (summary+payment): 20th. GSTR-9 (annual): Dec 31. QRMP scheme for <₹5Cr turnover.
Common Mistakes
1. Not claiming ITC on time. 2. Ignoring reverse charge. 3. Wrong HSN code. 4. Not reconciling GSTR-2A/2B.