GST Calculator: CGST / SGST / IGST + Inclusive / Exclusive

Calculate the CGST + SGST (intra-state) or IGST (inter-state) split. 5/12/18/28% rates. Both price-inclusive and exclusive modes.

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GST (Goods and Services Tax) was implemented in India from 1 July 2017. It consists of CGST + SGST/UGST + IGST + Cess (on luxury goods). On intra-state supply, CGST + SGST is levied as an equal split (e.g., 18% GST = 9% CGST + 9% SGST). On inter-state supply, full IGST (18%) is levied — credit is transferred to the recipient state.

This free GST Calculator takes the base amount, GST rate (5/12/18/28%), transaction type (intra/inter-state), and mode (inclusive/exclusive) as input. Outputs: base amount, total GST, CGST share, SGST share, IGST (if inter-state), final invoice total.

Rough guide to GST rates: - 5%: essential items (clothing under Rs 1000, processed food, transport) - 12%: basic manufactured goods (computers, phones, frozen meats, processed food) - 18%: most services, electronics, cement (default rate for most items) - 28%: luxury (cars, ACs, tobacco, gambling) - 0% / Exempt: fresh food, books, healthcare services, education services

Inclusive vs Exclusive: "Inclusive" means GST is already included in the MRP (typical for retail). Reverse calculation: base = total / (1+rate/100). "Exclusive" means GST is added on top of the base price (B2B invoices, services). Forward calc: total = base * (1+rate/100).

GST registration is mandatory for turnover > Rs 40L (goods) or > Rs 20L (services). Voluntary registration is possible at any turnover. Input Tax Credit (ITC) is available to registered businesses — you can reduce your output GST by the GST already paid on inputs.

Late filing fee + interest: Rs 50/day (Rs 25 CGST + Rs 25 SGST) per return, max Rs 5,000. Plus 18% p.a. interest on tax outstanding from the due date. GSTR-3B monthly, GSTR-1 monthly/quarterly. GSTR-9 annual.

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Frequently Asked Questions (FAQ)

When is GST registration mandatory?
For goods suppliers, turnover > Rs 40 lakh (special category states > Rs 20L); for service providers, > Rs 20L (special category > Rs 10L). E-commerce sellers, inter-state suppliers, and casual taxable persons have no threshold exemption — registration is mandatory from day 1.
What is the difference between CGST and SGST?
On intra-state supply (within the same state), CGST (Central GST, goes to the Centre) and SGST (State GST, goes to the state government) are levied in an equal split. On inter-state supply, IGST is levied (at the full rate, collected by the Centre and credit transferred to the recipient state). For UTs, UTGST applies.
How do you calculate a GST inclusive price?
Formula: Base price = Inclusive price / (1 + GST rate/100). Example: Item MRP Rs 590 (inclusive of 18% GST). Base = 590 / 1.18 = Rs 500. GST = Rs 90. This reverse calculation is useful for retail invoices where the MRP is shown.
What is the Composition Scheme?
A simplified scheme for small businesses (turnover < Rs 1.5 cr for goods, < Rs 50 lakh for services). A lower rate (1% for manufacturers, 5% for restaurants, 6% for other services) is charged flat on turnover. However, you cannot claim Input Tax Credit. This is useful for B2C businesses.
What is the GST late filing penalty?
Rs 50/day (CGST Rs 25 + SGST Rs 25) per return, max Rs 5,000. Rs 20/day for a Nil return. Plus 18% p.a. interest on outstanding tax from due date till payment. GSTR-1 + 3B is monthly/quarterly. Yearly GSTR-9 is due by Dec 31.

City-wise availability

You can use this same tool for free in Mumbai, Delhi, Bangalore, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Sirsa, and Mandi Dabwali. Seamless across mobile and desktop. You can also share the PDF directly on WhatsApp.

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