GST Calculator India – Add or Remove GST
Use this GST calculator to quickly calculate GST amount and final price. Choose whether you want to add GST on a base amount or remove GST from a GST-inclusive price.
You have a base price and you want to add GST to get the final price.
Common GST slabs are 5%, 12%, 18%, and 28%. You can also type a custom rate.
Tip
For invoices, GST may be split into CGST/SGST or IGST depending on the transaction. This calculator focuses on total GST amount.
Base amount
₹1,000.00
GST amount
₹180.00
Final amount
₹1,180.00
Quick breakdown
Final = Base + (Base × GST%)
GST (Goods and Services Tax) is an indirect tax applied on the supply of goods and services. In India, GST replaced multiple earlier indirect taxes to simplify taxation and improve transparency in billing and invoicing.
GST is generally charged as a percentage of the value of goods or services. Depending on the GST slab applicable to a product or service, the tax rate may vary.
There are two common use cases for GST calculation in India:
- Add GST: You know the base amount and want to find GST and final amount.
- Remove GST: You know the final amount (inclusive) and want to find base and GST amount.
GST Formula (India):
Add GST = Base Amount + (Base Amount × GST%)
Remove GST = Total Amount − (Total Amount / (1 + GST%))
This GST calculator supports both methods. For invoices, GST may be split into CGST/SGST for intra-state transactions or IGST for inter-state transactions. The total GST amount remains the same — only the split differs.
Is this GST calculator accurate?
It uses standard math formulas. Actual invoicing may involve rounding rules and GST split (CGST/SGST or IGST) depending on location.
What GST rates are common in India?
Common slabs include 5%, 12%, 18%, and 28%. Some items may be zero-rated or exempt.
Can I remove GST from an inclusive amount?
Yes. Use 'Remove GST' mode to get the base price and GST amount from a final inclusive price.
Does this tool handle CGST/SGST split?
This tool shows total GST. You can split it into CGST and SGST (half-half) for intra-state transactions if needed.
CGST vs SGST vs IGST: The Complete Split Guide
Understanding the split of GST is essential for correct invoicing in India. The type of GST applied depends on whether the transaction is "Intra-State" (within the same state) or "Inter-State" (between two different states).
- CGST (Central GST): Collected by the Central Government on intra-state sales.
- SGST (State GST): Collected by the State Government on intra-state sales. If the GST rate is 18%, it is split as 9% CGST and 9% SGST.
- IGST (Integrated GST): Collected by the Central Government on inter-state sales and imports. The full rate (e.g., 18%) is applied as IGST.
What is GST Input Tax Credit (ITC)?
Input Tax Credit (ITC) is one of the most significant benefits of the GST system. It allows businesses to reduce the tax they have already paid on inputs (purchases) from the tax they collect on outputs (sales).
For example, if you paid ₹1,800 as GST on raw materials and collected ₹2,500 as GST on your final product, you only need to pay the difference of ₹700 to the government. This prevents the "cascading effect" of taxes, where tax is paid on tax, ultimately lowering the cost of goods for the end consumer.
Common GST Mistakes for Small Businesses
Small business owners and freelancers often make these errors when calculating or filing GST:
- Incorrect Rate Slabs: Applying 12% instead of 18% can lead to penalties. Always verify the HSN code for your specific product or service.
- Mixing Inter-state and Intra-state: Filing CGST/SGST for an out-of-state client is a common error that requires complex rectification.
- Failing to Claim ITC: Many businesses forget to collect valid GST invoices from their vendors, missing out on thousands in tax savings.
- Non-compliance with Invoicing Rules: A valid GST invoice must include the GSTIN of both parties, a unique invoice number, and the place of supply.
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