GST Calculation Formulas
The mathematical operations to add or extract GST are structured as follows:
1. GST Exclusive (To Add Tax)
When adding tax on top of a base amount, the equation is:
Total Amount = Base Price + GST Amount
2. GST Inclusive (To Extract Tax)
When the tax is already integrated into the final retail selling cost:
Base Price = Retail Price - GST Amount
3. CGST & SGST Intrastate Split
Step-by-Step Intrastate Splitting Example
Let's take a service base cost of ₹10,000 with a standard service tax rate of 18%:
- GST Exclusive Case:
- GST Tax Amount = 10,000 × (18 / 100) = ₹1,800
- Grand Total = 10,000 + 1,800 = ₹11,800
- Intrastate splits: CGST (9%) = ₹900, SGST (9%) = ₹900
- GST Inclusive Case:
- GST Tax Amount = 10,000 - [ 10,000 / (1 + 0.18) ] = ₹1,525.42
- Net Base Price = ₹8,474.58
- Intrastate splits: CGST (9%) = ₹762.71, SGST (9%) = ₹762.71
GST Tax Slabs Ledger splits
| Regime Component | Percentage Rate | Calculated Value |
|---|---|---|
| Central GST (CGST) | 9% | ₹ 900 |
| State GST (SGST) | 9% | ₹ 900 |
| Aggregate Tax (GST) | 18% | ₹ 1,800 |
Multi-Slab Tax Comparison Ledger
Compare the tax splits and total cost breakdowns across all standard Goods and Services Tax (GST) slabs simultaneously for the current input value:
| GST Slab | Transaction Type | Base Price | GST Tax Amount | CGST & SGST Split | Total Price |
|---|
Frequently Asked Questions
GST Exclusive means the price of the product does not include the GST tax amount; tax is added on top of the base price. GST Inclusive means the tax amount is already incorporated into the final retail selling price.
For intrastate transactions within India, the total GST rate is divided equally into two components: Central GST (CGST) which goes to the central government, and State GST (SGST) which goes to the respective state government.
The standard tax rate structures defined by the GST Council are 5% (essential goods), 12% (standard rate items), 18% (most services and standard items), and 28% (luxury items and sin goods). Certain gold items also have a special rate of 3%.