GST Calculator India 2026 — Add or Remove GST with CGST & SGST Breakdown

How to Use the GST Calculator

Choose whether you want to Add GST to a base amount or Remove GST from a GST-inclusive amount. Enter the amount, select the GST rate (0%, 5%, 12%, 18% or 28%), and the calculator instantly shows CGST, SGST and IGST breakup.

GST Calculation Formula

To add GST: Total = Base Amount × (1 + Rate/100). CGST = SGST = Total GST / 2 (for intra-state).

To remove GST: Base = Inclusive Amount / (1 + Rate/100). GST Amount = Inclusive − Base.

Example: ₹10,000 + 18% GST = ₹11,800 total. CGST = ₹900, SGST = ₹900. For interstate supply, IGST = ₹1,800.

Common Use Cases

• Calculating invoice value after adding GST for B2B or B2C sales
• Finding the base price from a GST-inclusive MRP
• Splitting CGST and SGST for intra-state transactions
• Determining IGST for interstate supply of goods or services

Frequently Asked Questions

Q: What is the difference between CGST, SGST and IGST?

A: CGST (Central GST) and SGST (State GST) are levied on intra-state (within the same state) transactions. Each is half of the applicable GST rate — so for 18% GST, CGST = 9% and SGST = 9%. IGST (Integrated GST) is levied on inter-state transactions at the full GST rate (18%). The revenue split between Centre and State differs.

Q: How do I remove GST from a price that includes GST?

A: To find the base price from a GST-inclusive amount, use: Base Price = Inclusive Price ÷ (1 + GST Rate/100). For example, if a product costs ₹11,800 inclusive of 18% GST: Base Price = 11,800 ÷ 1.18 = ₹10,000. GST Amount = ₹11,800 − ₹10,000 = ₹1,800.

Q: Which GST rate applies to which goods and services?

A: 0% applies to essential items (fresh food, books, health services). 5% applies to packaged foods, household items, transport services. 12% applies to processed foods, mobile phones, business class air travel. 18% applies to most services, electronics, restaurants, software. 28% applies to luxury goods, automobiles, tobacco, aerated drinks.

Q: What is the GST composition scheme?

A: Small businesses with annual turnover up to ₹1.5 crore (₹75 lakh for service providers) can opt for the composition scheme and pay a flat GST rate of 1%–6% on turnover, without collecting GST from customers or claiming input tax credit. Composition dealers cannot issue GST invoices and cannot sell outside their state.

Q: Is GST applicable on exports?

A: Exports are zero-rated under GST, meaning the GST rate is 0% and exporters can claim a refund of input tax credit. This makes Indian exports globally competitive. Zero-rated is different from exempt — zero-rated allows input credit refund, while exempt does not.

Last updated: June 2026 · GST rates as per GST Council notifications · For informational purposes only.