🇮🇳 India
GST Calculator
The GST calculator helps Indian businesses, freelancers, and shoppers calculate Goods and Services Tax on invoices, quotations, and retail prices. Enter an amount in rupees, choose a GST slab, and add or remove tax instantly. The result splits CGST and SGST for intra-state transactions, shows the taxable base, and keeps every rupee value in the Indian numbering system used on bills and accounting records.
How to use
- Enter the amount in rupees exactly as it appears on your invoice, quotation, or price tag.
- Choose the GST slab that applies to the goods or services: 0%, 5%, 12%, 18%, or 28%.
- Select Add GST when your entered amount is before tax, or Remove GST when your amount already includes GST.
- Click Calculate GST to see taxable value, total GST, CGST, SGST, and invoice total.
- Use the chart to check the proportion of base price and tax before preparing the final bill.
Formula
Remove GST: Base = Inclusive Amount / (1 + Rate / 100)
CGST = SGST = Total GST / 2
GST is a percentage of the taxable value. When the listed price is exclusive of tax, the tax amount is calculated by multiplying the base value by the slab rate and dividing by 100. The invoice value is then the base plus GST. When the listed price is inclusive of tax, the tax must be extracted by dividing the total by one plus the slab rate as a decimal. This avoids the common mistake of subtracting 18% directly from an inclusive price.
For most intra-state supplies, GST is split equally into CGST and SGST. For inter-state supplies, the same total rate generally appears as IGST instead. The calculator focuses on the arithmetic and invoice split; product classification, place of supply, exemptions, reverse charge, and input tax credit eligibility must be confirmed against GST law and your tax advisor.
Worked example
A consultant quotes ₹50,000 before GST for a service taxable at 18%.
GST = ₹50,000 × 18 / 100 = ₹9,000. CGST is ₹4,500 and SGST is ₹4,500.
Invoice total = ₹59,000.
GST slab reference
| Goods or service | Typical GST rate |
|---|---|
| Fresh milk and unpacked food grains | 0% |
| Books and newspapers | 0% |
| Domestic transport | 5% |
| Essential medicines | 5% or 12% |
| Packaged food items | 5% or 12% |
| Hotel rooms | 12% or 18% |
| Software and IT services | 18% |
| Insurance services | 18% |
| Mobile phones | 18% |
| Air conditioners | 28% |
| Automobiles | 28% plus cess where applicable |
| Tobacco products | 28% plus compensation cess |
GST calculation tips for Indian invoices
Indian invoices normally show taxable value, CGST, SGST, or IGST separately. If a vendor gives only the final amount, use the Remove GST mode to find the taxable value before recording purchase cost or reconciling input tax credit. If you are quoting a customer, use Add GST mode so the buyer can see the base service fee and the tax separately.
Small differences of a few paise can appear because accounting software rounds each line item while a quick calculator rounds the final total. For high-value invoices, calculate GST line by line in your billing system and use this page as an independent reasonableness check.
Using this result in India
This GST Calculator is designed as a planning and audit tool, not as a substitute for the original Indian document that controls the transaction. For tax pages, that controlling document may be the Income-tax Act, Finance Act, Form 16, Form 26AS, AIS, challan, or employer declaration. For loan and investment pages, it may be the bank sanction letter, mutual fund scheme document, policy statement, EPFO passbook, NPS statement, or small-savings notification. For state-level pages, it may be a state transport, registration, electricity, or revenue department order. Use the calculator to understand scale, direction, and line-item logic before you rely on the official document.
Indian financial decisions are sensitive to timing. A rate that is correct for FY 2024-25 may not be correct for FY 2025-26. A monthly salary figure may not include bonus, arrears, reimbursements, or employer contributions. A property or vehicle quote may include charges that are negotiable, optional, or state-specific. A bank rate may be floating and linked to an external benchmark. Re-run the calculator when any input changes, and compare at least three scenarios: conservative, expected, and high-cost or low-return.
When the output is a large rupee amount, read it in both exact Indian notation and practical language. ₹10,00,000 is 10 lakhs, ₹1,00,00,000 is 1 crore, and small percentage changes can move the result by many lakhs on long tenures or high-value purchases. Keep screenshots or downloaded statements from the official portal, preserve invoices and receipts, and reconcile calculator output with the final bill, return, or statement before making a payment, filing a return, or signing a contract.
If you share the result with a family member, accountant, lender, employer, dealer, or broker, share the inputs too. Most disagreements come from different assumptions, not from the arithmetic.
FAQ
What is GST in India?
GST is Goods and Services Tax, an indirect tax on the supply of many goods and services in India. Registered businesses collect it from buyers and deposit it with the government after adjusting eligible input tax credit.
What are the common GST slabs?
The common GST slabs are 0%, 5%, 12%, 18%, and 28%. Some goods also carry compensation cess or special rates, so the exact rate depends on classification.
What is CGST and SGST?
CGST is Central GST and SGST is State GST. In most intra-state sales the GST amount is split equally between them. Inter-state sales generally use IGST instead.
Can I remove GST from an inclusive price?
Yes. Divide the inclusive price by one plus the GST rate as a decimal to get the taxable base. The difference between total and base is GST.
Does this calculator handle input tax credit?
No. It calculates invoice tax. Input tax credit depends on GST registration, invoice validity, return filing, supplier compliance, and blocked-credit rules.
Important notes for India
- GST rates can change through GST Council notifications, so verify unusual goods or services before issuing a tax invoice.
- CGST and SGST split applies to intra-state supplies; IGST usually applies when supplier and place of supply are in different states.
- Composition dealers, exempt suppliers, reverse-charge transactions, and e-commerce collections can have special treatment.
- For accounting, preserve the supplier GSTIN, invoice number, place of supply, and HSN/SAC details along with the calculated tax.