Tax & Salary

GST Calculator: Exclusive & Inclusive Rates

The GST Calculator computes both GST-inclusive and GST-exclusive amounts according to statutory Central GST (CGST) and State GST (SGST) or Integrated GST (IGST) rules in India.

GST Calculation Parameters

Calculation Mode
GST Rate Slab
Total Invoice Amount
₹ 11,800
Base Net Price:₹ 10,000
Total GST (18%):+₹ 1,800
CGST (9.0%): ₹ 900SGST (9.0%): ₹ 900
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GST Mathematical Equations

GST Amount = (Base Price × Rate) / 100 | Inclusive Base = Gross / (1 + Rate / 100)
  • Adding GST (Exclusive): Total = Net Price + (Net Price × GST Rate / 100).
  • Removing GST (Inclusive): Base Net = Gross Price / (1 + GST Rate / 100).
  • Tax Division: For intra-state transactions, CGST = 50% of GST, SGST = 50% of GST.

Practical Worked Example

Calculating GST at 18% on a service billing amount of ₹50,000 (Exclusive).

Net Billing Price:₹50,000
GST Slab Rate:18%
Supply Type:Intra-State (Within State)
Calculation Steps:
  1. Total GST Amount: ₹50,000 × 18% = ₹9,000.
  2. Central GST (CGST at 9%): ₹9,000 / 2 = ₹4,500.
  3. State GST (SGST at 9%): ₹9,000 / 2 = ₹4,500.
  4. Gross Invoice Total: ₹50,000 + ₹9,000 = ₹59,000.
Final Output: ₹59,000 invoice total (CGST: ₹4,500, SGST: ₹4,500).

Frequently Asked Questions

What are the official GST rate slabs in India?

India operates under a 4-tier GST rate structure: 5% (essential goods/transport), 12% (standard items/processed foods), 18% (most commercial services and manufactured goods), and 28% (luxury items and demerit goods), alongside a 0% exemption list.

When is IGST charged instead of CGST and SGST?

Integrated Goods and Services Tax (IGST) applies on inter-state supplies (when seller and buyer are in different states) and imports. The full GST percentage goes under IGST to the Central Government before revenue sharing.

How do I extract the original price from a GST-inclusive MRP?

Use the formula: Base Price = MRP / (1 + GST Rate / 100). For example, an item costing ₹1,180 with 18% GST has a base price of ₹1,180 / 1.18 = ₹1,000, and GST of ₹180.

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Verified & Mathematically Audited Formula
Formula tested against standard statutory & academic references.
Updated: 2026-10-01·View Changelog·3-Source Methodology
Statutory & Academic Sources
  • ›Standard Mathematical & Regulatory Reference Guidelines
  • ›Independent Statutory Verification Benchmark

Disclaimer: This tool provides computational estimates for educational and informational purposes only. It does not constitute personal financial, tax, or legal advice. Consult a certified financial planner or CA for specific advice.