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Complete GST Guide in India (2026)

This guide explains everything about Goods and Services Tax (GST) in India — who must register, GST return filing process, GST calculation examples, penalties, and compliance rules for businesses and freelancers.

What is GST?

GST (Goods and Services Tax) is an indirect tax applied on the supply of goods and services in India. It replaced multiple indirect taxes like VAT, service tax, and excise duty.

GST is destination-based and charged at every stage of value addition, with input tax credit available to businesses.

Types of GST

  • CGST – Central GST (collected by central government)
  • SGST – State GST (collected by state government)
  • IGST – Integrated GST (for inter-state transactions)
  • UTGST – Union Territory GST

Who Must Register Under GST?

  • Businesses with turnover above ₹40 lakh (₹20 lakh for services in many states)
  • E-commerce sellers
  • Inter-state suppliers
  • Freelancers providing taxable services

GST Calculation Example (Practical Breakdown)

Let’s understand GST with a real example.

Example:

Product Price (before GST): ₹1,000

GST Rate: 18%

  • GST Amount = ₹1,000 × 18% = ₹180
  • Total Invoice Value = ₹1,180
  • If intra-state → CGST ₹90 + SGST ₹90
  • If inter-state → IGST ₹180

Businesses can claim Input Tax Credit (ITC) on GST paid for purchases.

What is Input Tax Credit (ITC)?

Input Tax Credit allows businesses to reduce the GST paid on purchases from the GST collected on sales.

Example:

GST collected from customer: ₹18,000

GST paid on purchases: ₹10,000

Net GST payable = ₹8,000

Types of GST Returns

  • GSTR-1 – Details of outward supplies
  • GSTR-3B – Monthly summary return
  • GSTR-9 – Annual return

Detailed filing steps: How to File GST Return in India

GST Return Due Dates

  • GSTR-1 – 11th of following month
  • GSTR-3B – 20th of following month
  • Annual Return – 31 December

GST Penalties for Late Filing

Late filing attracts ₹50 per day (₹25 CGST + ₹25 SGST) and ₹20 per day for nil returns, subject to maximum limits.

Frequently Asked Questions (GST)

Is GST mandatory for freelancers?

GST registration is mandatory if annual turnover exceeds prescribed limits or if providing inter-state services.

What happens if GST return is not filed?

Late fees, interest, and suspension of GST registration may apply.

Can I claim GST refund?

Yes, excess input tax credit or export-related credits can be refunded.

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