GST Calculator

Calculate GST (Goods and Services Tax) with CGST and SGST breakdown. Add or remove GST from any amount.

Enter Details

Note: GST is split equally between CGST (Central) and SGST (State) for intra-state transactions.

Total Amount (with GST)

₹11,800.00

💰Total GST
₹1,800.00
📄Base Amount
₹10,000.00

GST Breakdown

CGST@ 9%
₹900.00
SGST@ 9%
₹900.00
Total GST₹1,800.00

Summary

Base Amount₹10,000.00
GST (18%)+ ₹1,800.00
Total Amount₹11,800.00

What is GST (Goods and Services Tax)?

GST (Goods and Services Tax) is India's comprehensive indirect tax that replaced multiple cascading taxes like VAT, service tax, excise duty, and octroi. Implemented on July 1, 2017, GST follows a "One Nation, One Tax" model, simplifying India's complex tax structure.

Key features of GST:

  • Destination-based: Tax collected where goods/services are consumed
  • Multi-stage: Applied at each stage of value addition
  • Input Tax Credit: Tax on inputs can be offset against output tax
  • Eliminates cascading: No tax-on-tax effect

GST structure in India:

  • CGST (Central GST): Collected by Central Government
  • SGST (State GST): Collected by State Government
  • IGST (Integrated GST): For inter-state transactions
  • UTGST: For Union Territories without legislature

GST Rate Slabs

GST applies at different rates based on the nature of goods and services:

0% (Exempt):

  • Fresh vegetables, fruits, milk, eggs
  • Healthcare and educational services
  • Books, newspapers, handloom products
  • Agricultural services

5% Slab:

  • Essential food items (sugar, tea, coffee, edible oils)
  • Economy class air travel
  • Transport services, small restaurants
  • Footwear under Rs. 1,000

12% Slab:

  • Processed food, butter, cheese
  • Mobile phones, computers
  • Business class air travel
  • Work contracts

18% Slab (Standard Rate):

  • Most goods and services
  • Restaurant food (with AC), IT services
  • Financial services, telecom
  • Hair oil, soap, toothpaste

28% Slab (Luxury/Sin Goods):

  • Automobiles, luxury items
  • Aerated drinks, tobacco products
  • 5-star hotel accommodations
  • Cement, paints, dishwashers

GST Calculation Formulas

GST is calculated differently based on whether the price is inclusive or exclusive:

GST Calculation

GST Amount = (Original Price × GST Rate) / 100

Where:

  • Original Price= Price before GST (exclusive)
  • GST Rate= Applicable rate (5%, 12%, 18%, or 28%)

GST Inclusive vs Exclusive Pricing

GST Exclusive (Adding GST):

  • GST Amount = Price × GST Rate / 100
  • Total Price = Original Price + GST Amount
  • Example: Rs. 1,000 + 18% GST = Rs. 1,180

GST Inclusive (Extracting GST):

  • Original Price = Total Price × 100 / (100 + GST Rate)
  • GST Amount = Total Price - Original Price
  • Example: Rs. 1,180 inclusive → Original: Rs. 1,000, GST: Rs. 180

CGST and SGST Split (Intra-state):

  • CGST = Half of total GST (goes to Centre)
  • SGST = Half of total GST (goes to State)
  • Example: 18% GST = 9% CGST + 9% SGST

IGST (Inter-state):

  • Full GST amount goes as IGST
  • Later distributed between states
  • Example: 18% IGST on Delhi to Mumbai sale

How to Use This Calculator

Our GST calculator helps you compute tax amounts quickly:

  1. Enter Amount:
    • Original price (if exclusive of GST)
    • Total price (if inclusive of GST)
  2. Select GST Rate:
    • Choose from 5%, 12%, 18%, or 28%
    • Or enter custom rate if applicable
  3. Select Transaction Type:
    • Intra-state (within same state) - CGST + SGST
    • Inter-state (different states) - IGST

Results include:

  • GST amount
  • CGST and SGST breakdown (or IGST)
  • Original price and final price
  • Tax amount per slab comparison

Input Tax Credit (ITC)

What is Input Tax Credit?

ITC allows businesses to claim credit for GST paid on purchases against GST collected on sales. This prevents tax cascading.

How ITC works:

  • GST paid on inputs: Rs. 1,800 (on Rs. 10,000 purchase @ 18%)
  • GST collected on output: Rs. 3,600 (on Rs. 20,000 sale @ 18%)
  • Net GST payable: Rs. 3,600 - Rs. 1,800 = Rs. 1,800

ITC eligibility conditions:

  • Must have valid tax invoice
  • Goods/services must be received
  • Supplier must have filed returns
  • Must use for business purposes
  • Must not be on blocked credit list

Blocked credits (no ITC available):

  • Motor vehicles (except for specific purposes)
  • Food and beverages, club memberships
  • Personal consumption items
  • Goods lost, stolen, or destroyed

GST Registration Requirements

Mandatory registration if:

  • Annual turnover exceeds Rs. 40 lakhs (goods) or Rs. 20 lakhs (services)
  • Rs. 20 lakhs / Rs. 10 lakhs for special category states
  • Interstate supply of goods/services
  • E-commerce operators or sellers
  • Casual taxable person
  • Input service distributor

Composition scheme (for small businesses):

  • Turnover up to Rs. 1.5 crore (Rs. 75 lakhs for special states)
  • Pay 1% (goods), 5% (restaurants), 6% (others) flat tax
  • Cannot collect GST from customers
  • Cannot claim ITC
  • Cannot make interstate supplies

Worked Examples

Calculate GST on Exclusive Price

Problem:

Product price Rs. 10,000 (GST exclusive), GST rate 18%, intra-state sale.

Solution Steps:

  1. 1GST Amount = Rs. 10,000 × 18 / 100 = Rs. 1,800
  2. 2CGST (9%) = Rs. 900
  3. 3SGST (9%) = Rs. 900
  4. 4Total Price = Rs. 10,000 + Rs. 1,800 = Rs. 11,800

Result:

Customer pays Rs. 11,800. GST of Rs. 1,800 split equally as Rs. 900 CGST and Rs. 900 SGST.

Extract GST from Inclusive Price

Problem:

Bill shows Rs. 5,900 inclusive of 18% GST. Calculate original price and GST.

Solution Steps:

  1. 1Original Price = Rs. 5,900 × 100 / 118
  2. 2Original Price = Rs. 5,000
  3. 3GST Amount = Rs. 5,900 - Rs. 5,000 = Rs. 900
  4. 4CGST = Rs. 450, SGST = Rs. 450

Result:

Original price is Rs. 5,000, GST is Rs. 900 (CGST Rs. 450 + SGST Rs. 450).

Inter-state GST (IGST)

Problem:

Business in Delhi sells goods worth Rs. 50,000 to buyer in Mumbai. GST 12%.

Solution Steps:

  1. 1IGST applies for inter-state sale
  2. 2IGST Amount = Rs. 50,000 × 12 / 100 = Rs. 6,000
  3. 3No CGST/SGST split
  4. 4Total Invoice = Rs. 50,000 + Rs. 6,000 = Rs. 56,000

Result:

Invoice shows Rs. 56,000 with Rs. 6,000 as IGST. IGST will be distributed between Delhi and Maharashtra.

Tips & Best Practices

  • Always verify if quoted price is GST inclusive or exclusive before purchase
  • Keep all GST invoices for claiming Input Tax Credit
  • Match ITC claims with GSTR-2B to avoid discrepancies
  • File returns on time to avoid late fees and interest
  • Use correct HSN/SAC codes to apply right GST rate
  • Check supplier GST compliance before large transactions
  • Consider composition scheme if your turnover is under Rs. 1.5 crore
  • Maintain separate records for B2B and B2C sales

Frequently Asked Questions

B2B invoices typically show GST exclusive prices (base price + GST separately). B2C prices often show inclusive amounts (MRP includes GST). Legally, all registered businesses must show GST breakup on invoices. Always clarify with sellers whether quoted prices include GST.
GST rates are based on HSN codes (for goods) and SAC codes (for services). Search the GST rate finder on the official GST portal (gst.gov.in) or consult the GST rate schedule. When in doubt, consult a CA/tax professional as incorrect rates can lead to penalties.
Under reverse charge, the buyer pays GST directly to the government instead of the seller. This applies for purchases from unregistered dealers (if aggregate exceeds Rs. 5,000/day), specified services (legal, GTA), and import of services. The buyer can claim ITC on this tax.
Regular taxpayers file GSTR-1 (outward supplies) monthly by 11th and GSTR-3B (summary return) by 20th. Composition dealers file quarterly. Annual return GSTR-9 is due by December 31. Late filing attracts Rs. 50/day (CGST+SGST) penalty up to a maximum.
No. ITC is only available for goods/services used for business purposes. If goods are partly for business and partly personal, ITC is proportionally available only for the business portion. Personal use items are on the blocked credit list.
If your supplier doesn't file GSTR-1, the invoice won't reflect in your GSTR-2A/2B, and you may face ITC matching issues. Follow up with suppliers for compliance. From 2022, ITC is restricted if invoice doesn't appear in GSTR-2B.

Sources & References

Last updated: 2026-01-22