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GST Calculator – Calculate GST Amount on Price
About this calculator
Use the GST Calculator – Calculate GST Amount on Price to quickly estimate results. Enter the inputs and review the calculated output below. This tool is for guidance and educational purposes only.
More about this tool
What is GST?
Goods and Services Tax (GST) is an indirect tax replaced previous taxes like VAT, excise duty, and service tax. GST is applicable on supply of goods and services in India. There are four GST slabs: 5%, 12%, 18%, and 28% depending on the product category. GST simplifies the tax system and reduces the cascade effect of multiple taxes. Use this GST calculator to compute taxed price, reverse GST, and net margin after tax.
Types of GST — CGST, SGST, IGST, UTGST
Central GST (CGST) and State GST (SGST) are charged on intra-state sales and split equally between the Centre and the State. Integrated GST (IGST) is charged on inter-state sales and on imports, collected by the Centre and later shared with the destination state. Union Territory GST (UTGST) replaces SGST in Union Territories without legislature. A 18% invoice within the same state is 9% CGST + 9% SGST; a 18% invoice across states is 18% IGST.
GST Slabs and Rates
GST in India has five main slabs: 0% (essentials like fresh milk, vegetables, unbranded flour), 5% (packaged food, footwear under Rs. 1,000, economy air tickets), 12% (processed food, business-class air tickets), 18% (most goods and services — soaps, toothpaste, hotels under Rs. 7,500, telecom), and 28% (luxury cars, tobacco, aerated drinks, high-end hotels). A compensation cess is levied on top of 28% for sin and luxury goods.
Forward GST Calculation (Price to Price + GST)
If the price is Rs. 1,000 and GST is 18%, the GST amount is 1000 × 18 / 100 = Rs. 180 and the total invoice is Rs. 1,180. This is the most common calculation for quoting prices to customers on a base-plus-tax basis. Our calculator automates this for any GST slab and produces the CGST-SGST split for intra-state use.
Reverse GST Calculation (Inclusive Price to Base)
If the all-inclusive price is Rs. 1,180 at 18% GST, the base price is 1180 × 100 / 118 = Rs. 1,000 and the GST portion is Rs. 180. Reverse calculations are used when printing MRP-inclusive prices, preparing invoices from a fixed selling price, or reconciling point-of-sale receipts. Switch the calculator to reverse mode to extract the base amount and tax.
Input Tax Credit (ITC)
Registered businesses can claim ITC on GST paid on purchases used for business. For example, if you paid Rs. 18,000 GST on inputs and charged Rs. 25,000 GST on sales, you pay only Rs. 7,000 to the government. ITC eliminates the cascading of taxes. ITC is allowed only if the supplier has filed their returns and the invoice is reflected in GSTR-2B. ITC is blocked for items like motor vehicles (with exceptions), club memberships, and personal expenses.
GST Registration Requirements
Registration is mandatory if annual turnover exceeds Rs. 40 lakh for goods (Rs. 20 lakh for special-category states) or Rs. 20 lakh for services (Rs. 10 lakh for special-category states). Registration is also mandatory irrespective of turnover for inter-state suppliers, e-commerce sellers, casual taxable persons, non-resident suppliers, and those liable under reverse charge. Voluntary registration is allowed below these thresholds.
GST Composition Scheme
Small businesses with annual turnover up to Rs. 1.5 crore (Rs. 75 lakh for special-category states) can opt for the composition scheme. Manufacturers and traders pay 1% of turnover; restaurants pay 5%. Composition dealers cannot collect GST from customers, cannot claim ITC, and cannot make inter-state supplies. It simplifies compliance but suits only businesses serving end-consumers within one state.
E-way Bill
An e-way bill is required for movement of goods worth over Rs. 50,000 within the same state (threshold varies by state) or across states. It must be generated on the GST portal before movement and carried in the vehicle in digital or printed form. Validity is typically one day per 200 km. Non-compliance attracts penalties and detention of goods.
GST Filing and Returns
Regular taxpayers file GSTR-1 (outward supplies) monthly or quarterly and GSTR-3B (summary and tax payment) monthly. Composition dealers file CMP-08 quarterly and GSTR-4 annually. All taxpayers file GSTR-9 (annual return) by December of the following financial year. Returns must be filed even if there are no transactions in the period ("nil return"), otherwise late fees apply.
Penalties for GST Non-Compliance
Late filing of returns attracts Rs. 50 per day (Rs. 20 for nil returns) up to a maximum of Rs. 5,000. Late payment of tax attracts 18% interest per annum. Fraudulent claims of ITC or tax evasion can attract a penalty of 100% of the tax involved plus prosecution. Always reconcile books with GSTR-2B and file on time to avoid notices and blocked returns.
Frequently asked questions
What are the GST slab rates in India?
GST has five main slabs: 0% (essentials), 5% (packaged food, economy air tickets), 12% (processed food), 18% (most goods and services), and 28% (luxury and sin goods). A cess may apply on top of 28% for certain items.
How do I calculate GST on a price?
For forward calculation (base to inclusive): GST amount = base × rate ÷ 100, total = base + GST. For reverse (inclusive to base): base = inclusive × 100 ÷ (100 + rate). Our calculator handles both modes.
What is the difference between CGST, SGST, and IGST?
For intra-state sales, GST splits equally into Central GST (CGST) and State GST (SGST). For inter-state sales, a single Integrated GST (IGST) is charged. An 18% intra-state invoice is 9% CGST + 9% SGST.
When is GST registration mandatory?
Registration is mandatory if annual turnover exceeds Rs. 40 lakh for goods (Rs. 20 lakh for special-category states) or Rs. 20 lakh for services. It is also mandatory for inter-state suppliers and e-commerce sellers regardless of turnover.