When should I use CGST + SGST vs. IGST?

For intra-state transactions (buyer and seller in the same Indian state), GST is split equally into Central GST (CGST) and State GST (SGST). For inter-state transactions (buyer and seller in different states), Integrated GST (IGST) is applied as a single combined rate.

What are the standard GST tax slabs in India?

The primary GST tax slabs under Indian law are 0% (essential items), 5% (household essentials, transport), 12% (processed foods, business services), 18% (most software, IT services, consulting, consumer electronics), and 28% (luxury vehicles, tobacco, luxury items).

How is GST calculated on services like web development and IT?

Most IT consulting, web development, and digital marketing services in India attract an 18% GST rate. On an invoice of ₹1,00,000 for a client in the same state, CGST is ₹9,000 (9%) and SGST is ₹9,000 (9%), making the final invoice ₹1,18,000.

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GST Tax Calculator India

Accurate Indian Goods and Services Tax (GST) calculations with Inclusive/Exclusive modes, custom slab rates, and CGST / SGST split breakdowns.

Exclusive: [Amount × Rate ÷ 100] | Inclusive: [Amount − (Amount × 100 ÷ (100 + Rate))]

GST CONFIGURATION

INTERACTIVE INPUTS

CALCULATION TYPE

NET AMOUNT (BEFORE GST) (₹) *

₹

GST SLAB / TAX RATE

TRANSACTION TYPE (TAX SPLIT)

GST BREAKDOWN SUMMARY

Tax added to net amount

TOTAL FINAL INVOICE AMOUNT

₹11,800

Inclusive of 18% GST (₹1,800)

Net Base Amount (excl. tax)₹10,000

Total GST Tax Amount (18%)₹1,800

Central GST (CGST @ 9%)₹900

State GST (SGST @ 9%)₹900

Total Payable / Receivable₹11,800

Formula: GST = Amount × 18/100 | Total = Amount + GST

Understanding GST Calculator

Understanding Goods & Services Tax (GST) in India

Goods and Services Tax (GST) is a comprehensive, multi-stage, destination-based indirect tax levied on the manufacture, sale, and consumption of goods as well as services across India. Enacted in 2017, GST unified numerous state and central taxes into a single structured framework.

Whether you are an independent freelancer issuing an invoice, an e-commerce retailer computing retail price points, or a business manager budgeting procurement expenses, calculating precise tax splits is critical for statutory compliance, accurate cash flow forecasting, and avoiding audit penalties.

This tool allows you to seamlessly toggle between adding GST to a net price (Exclusive Mode) or extracting the hidden GST component from a retail MRP (Inclusive Mode), with automatic 50/50 division into CGST and SGST for intra-state billing or single-rate IGST for inter-state transactions.

Key Highlights

Exclusive (Add Tax) and Inclusive (Extract Tax) modes
Quick presets for 0%, 5%, 12%, 18%, and 28% GST slabs
Custom decimal percentage rate support
Automatic split for CGST + SGST or combined IGST
One-click clipboard export and print-ready summary

Mathematical Formula

Exclusive: Tax = (Base × Rate) / 100 | Inclusive: Tax = Gross − [Gross × (100 / (100 + Rate))]

In Exclusive Mode, the tax is a direct percentage of the base price. In Inclusive Mode, the tax is extracted using the reciprocal ratio to determine the true underlying pre-tax amount.

How to Use the GST Calculator (Step-by-Step)

01Step 1

Enter the initial financial amount in Indian Rupees (₹).

02Step 2

Select whether the entered amount is GST Exclusive (pre-tax) or GST Inclusive (already includes tax).

03Step 3

Choose your statutory GST slab (5%, 12%, 18%, 28%) or enter a custom rate.

04Step 4

Select CGST + SGST (intra-state) or IGST (inter-state) to view the complete tax invoice breakdown.

Practical Real-World Calculation Examples

Software Development Invoice (18% Exclusive)

Case #1

Scenario: A Jaipur agency bills a local client ₹50,000 for custom website design.

Base: ₹50,000 | CGST (9%): ₹4,500 | SGST (9%): ₹4,500

Result: Total Invoice: ₹59,000 (Tax = ₹9,000)

Retail Consumer Electronics (18% Inclusive)

Case #2

Scenario: A retail customer buys a monitor with a maximum retail price (MRP) of ₹14,160.

Base = ₹14,160 × (100 / 118) = ₹12,000 | GST = ₹2,160

Result: Base Price: ₹12,000 | GST Extracted: ₹2,160

Inter-State B2B Machinery Sale (12% IGST)

Case #3

Scenario: A manufacturer in Rajasthan delivers equipment worth ₹2,00,000 to a buyer in Delhi.

Base: ₹2,00,000 | IGST (12%): ₹24,000

Result: Total Billed: ₹2,24,000 (IGST = ₹24,000)

Restaurant Food Delivery (5% Exclusive)

Case #4

Scenario: A cafe invoices food items totaling ₹1,800 under the composite restaurant slab.

Base: ₹1,800 | CGST (2.5%): ₹45 | SGST (2.5%): ₹45

Result: Final Bill: ₹1,890 (Tax = ₹90)

Important Notes, Assumptions & Disclaimers

GST rates are subject to change based on official notifications issued by the GST Council of India.
Certain composite schemes, reverse charge mechanisms (RCM), and specific exemptions (e.g., SEZ supplies) require specialized accounting treatment.
Always verify current HSN / SAC codes and applicable rates with your chartered accountant or tax advisor.

Notice: This calculator is provided for informational and estimation purposes only. It does not constitute formal legal, accounting, or tax advice. For statutory GST filings (GSTR-1, GSTR-3B) and tax returns, consult a certified tax professional.

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Frequently Asked Questions

GST Calculator FAQs

GST Exclusive means the tax has not yet been added to the base cost; you add the GST amount on top of the base price. GST Inclusive means the gross amount already contains the tax component, and the calculator reverse-computes the base price and extracted GST.

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