GST (Goods and Services Tax) is India’s destination-based tax on most goods and services. It replaced earlier levies such as VAT, Central Excise, and Service Tax. This page calculates the tax amount from the price and rate you enter; it does not decide which rate applies to your supply.

How do I calculate GST?

Add GST (exclusive): tax = base × rate / 100, total = base + tax. Example: ₹10,000 at 18% → ₹1,800 tax, ₹11,800 total. Remove GST (inclusive): base = inclusive / (1 + rate / 100). Example: ₹11,800 at 18% → ₹10,000 base, ₹1,800 tax. Use Add GST or Remove GST above to run either direction.

What is GST inclusive vs exclusive?

Exclusive (pre-tax) is the seller’s base; GST is added on top. Inclusive (post-tax) already contains GST; the calculator extracts the base and the tax. Switch the mode toggle to match how the price was quoted.

What is the difference between CGST, SGST and IGST?

Same-state supply splits GST equally into CGST (Centre) and SGST/UTGST (State or UT). Other-state supply and imports use one IGST amount instead. An 18% intra-state bill is 9% CGST + 9% SGST; the same 18% inter-state bill is 18% IGST.

What GST rates are currently common in India?

Common options in this calculator are 5%, 18%, 40%, 0% / exempt, and a custom rate. Not every item uses those four. The legal rate follows the HSN code (goods) or SAC code (services) in CBIC notifications. Confirm the code for your supply rather than guessing from the product name.

Can I calculate multiple items with different GST rates?

Yes. Open Invoice mode, add line items, and set each line’s quantity, unit price, HSN/SAC, and rate. The tool totals taxable value, GST by slab, and the invoice grand total.

Can I download the GST calculation?

Yes. Invoice mode downloads a business invoice PDF with GSTIN, invoice number, HSN, and tax breakup. Download Report still exports a calculation PDF, CSV, or PNG. Neither is a statutory e-invoice.

Can this calculator create a legal GST invoice?

No. You can fill business and customer details and download a professional invoice PDF for quotes and billing. It has no IRN or government QR, and it cannot replace e-invoicing or GSTR filings.

Can this calculator calculate ITC?

No. It shows gross GST on the amounts you enter. Net GST payable after Input Tax Credit needs your purchase invoices and return workings.

Does GST calculation determine my actual GST liability?

No. Liability depends on classification, exemptions, place of supply, and what you file with the tax department. Use this tool for arithmetic, then confirm against official rules.

Are GST calculator results accurate?

Yes. GST calculators use standard tax formulas and provide accurate results based on the values and tax rates entered. Accuracy depends on selecting the correct GST rate for the transaction.

Can I use this GST calculator for invoices and quotations?

Yes. Businesses commonly use GST calculators when creating invoices, quotations, purchase orders, and tax estimates to determine GST amounts and total payable values quickly.

GST Calculator 2026 – Add or Remove GST, CGST & SGST, Reverse GST & Discount

How GST, Trade Discounts & Invoicing Work in India

Under the Indian Goods and Services Tax (GST) framework, understanding whether your quoted price is tax-exclusive or tax-inclusive, and ensuring that trade discounts reduce taxable value before tax is applied, ensures clean financial accounting and accurate invoice totals.

Standard GST Slabs in India

GST rates depend on the official CBIC HSN or SAC classification notifications.

GST Slab	Supply Scope	Intra-State Split	On ₹10,000 Taxable
0% (Exempt)	Unbranded fresh foods, milk, grain, municipal services	CGST 0% + SGST 0%	GST: ₹0 \| Total: ₹10,000
5% (Essentials)	Packaged foods, transport services, life-saving medicines	CGST 2.5% + SGST 2.5%	GST: ₹500 \| Total: ₹10,500
12% (Goods)	Processed goods, business class air tickets, apparel	CGST 6% + SGST 6%	GST: ₹1,200 \| Total: ₹11,200
18% (Standard)	IT services, consulting, software, standard manufactured items	CGST 9% + SGST 9%	GST: ₹1,800 \| Total: ₹11,800
28% (Luxury)	Automobiles, luxury items, specified entertainment	CGST 14% + SGST 14%	GST: ₹2,800 \| Total: ₹12,800

When to use Add GST vs Remove GST

Use Add GST when the quote is exclusive of tax and you need the bill total. Use Remove GST (Reverse GST) when the sticker price already includes tax and you need the taxable base the seller keeps.

Same-state vs other-state supply

If supplier and buyer are in the same state, GST splits equally into CGST and SGST/UTGST. If they are in different states, or the supply is an import, the same tax shows as a single IGST amount.

Why Trade Discounts Must Precede GST Calculation

Under Section 15(3)(a) of the CGST Act, trade discounts clearly indicated on the invoice at or before supply reduce the taxable value of supply. GST is charged only on the discounted net taxable base.

Multi-Rate Invoicing & Tax Slabs Summary

When raising an invoice with items in different tax slabs (e.g. 5%, 12%, 18%), each line must be computed separately and summarized by tax slab in the invoice footer.

Invoice Rounding Adjustment Rules

Under Rule 54 of CGST Rules, invoice totals can be rounded off to the nearest rupee. The calculator explicitly shows the exact unrounded total and the rounding adjustment so both amounts are transparent.

Browser Privacy & Data Protection

All invoice itemizations, buyer details, and price calculations run 100% locally in your browser. No quotation data or client records are uploaded to remote servers.

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GST Calculator

Itemized GST Invoice Builder

Find GST from a GST-Inclusive Price

How GST, Trade Discounts & Invoicing Work in India

Trade Discount Before GST

Exclusive GST (Forward Calculation)

Inclusive GST & Reverse GST (Reverse Extraction)

Intra-State vs Inter-State Supply Split

Exclusive GST with 10% Discount Example

Reverse GST Extraction Example

Standard GST Slabs in India

Formula Reference

GST Formula

AI Tax & Invoicing Assistant