GST Calculator (Goods & Services Tax)
Calculate GST Inclusive and Exclusive amounts with standard Indian GST slabs (5%, 12%, 18%, 28%).
Base: ₹50,000 + GST (18%): ₹9,000
Tax Breakdown Summary
Comparative Invoice Across Indian GST Slabs (0%, 5%, 12%, 18%, 28%)
Detailed breakdown for each calendar year
| Year | Taxable Base Amount | GST Tax Payable | Final Invoice Amount |
|---|---|---|---|
| Year 0 | ₹50,000 | ₹0 | ₹50,000 |
| Year 5 | ₹50,000 | ₹2,500 | ₹52,500 |
| Year 12 | ₹50,000 | ₹6,000 | ₹56,000 |
| Year 18 | ₹50,000 | ₹9,000 | ₹59,000 |
| Year 28 | ₹50,000 | ₹14,000 | ₹64,000 |
How this is Calculated: GST Computation
Mathematical Formula
Variable Definitions
Worked Example Walkthrough
Scenario: IT services or commercial goods with base price of ₹50,000 subject to 18% GST.
Calculation: Base = ₹50,000; CGST (9%) = ₹4,500; SGST (9%) = ₹4,500; Total GST = ₹9,000
Result: Taxable Base: ₹50,000 | CGST: ₹4,500 | SGST: ₹4,500 | Total Invoice Value: ₹59,000
Assumptions & Methodology
- Intra-state transactions split 50/50 between CGST and SGST.
- For inter-state transactions, IGST is simply equal to the total GST amount.
About this Calculation Model
The GST Calculator computes Goods and Services Tax (GST) in accordance with the Central Goods and Services Tax Act of India. It handles both "GST Exclusive" (adding tax onto a net base price) and "GST Inclusive" (extracting embedded tax from a gross invoice price), providing an exact 50/50 breakdown between Central GST (CGST) and State GST (SGST) for intra-state transactions.
How to Choose Your Calculator Inputs
1Calculation Type
GST Exclusive adds tax to a net base price; GST Inclusive extracts the tax already embedded within a retail price.
2Amount (₹)
The base amount before tax (in exclusive mode) or total sticker price (in inclusive mode).
3GST Slab Rate (%)
Standard Indian GST slabs: 0% (exempt), 5% (essentials), 12% (standard goods), 18% (services and electronics), 28% (luxury/sin goods).
Interpreting Your Projections
For domestic intra-state trade within the same Indian state or union territory, total GST is divided equally between CGST (Central Government) and SGST (State Government). For inter-state trade, the full amount is levied as Integrated GST (IGST).
Important Statutory & Practical Considerations
- Compensation Cess: Certain luxury and sin goods (automobiles, aerated beverages, tobacco) attract an additional GST Compensation Cess on top of the 28% slab, which is not included in standard base slab arithmetic.
- Reverse Charge Mechanism (RCM): Specific specialized transactions require the recipient rather than the supplier to remit GST directly.
- Composition Scheme: Small businesses registered under the GST Composition Scheme pay fixed turnover taxes rather than itemized slab rates, and cannot charge GST on customer invoices.
Frequently Asked Questions
What is the formula to extract GST from an inclusive price?
To extract GST from a total gross price: Base Amount = Total Price / (1 + GST Rate / 100); Total GST = Total Price - Base Amount.
How is GST split between CGST and SGST?
For intra-state transactions (where buyer and seller are located in the same state), GST is split equally: 50% CGST and 50% SGST. For inter-state transactions, 100% of the tax is collected as Integrated GST (IGST).
What are the official GST rate slabs in India?
The primary GST slabs established by the GST Council are 0% (exempt essential food items), 5% (basic necessities), 12% (processed foods and business goods), 18% (most commercial services, software, and electronics), and 28% (luxury and automotive goods).
Can businesses claim Input Tax Credit (ITC) on GST paid?
Yes. Under the GST framework, registered businesses can claim Input Tax Credit (ITC) for taxes paid on business-related purchases to offset against their outward tax liabilities, avoiding cascading taxation.
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