GST Calculator

What is the Goods and Services Tax (GST)?

The **Goods and Services Tax (GST)** is a comprehensive, multi-stage, destination-based indirect tax levied on the consumption of goods and services in India. Launched on July 1, 2017, GST replaced almost all previous indirect taxes such as Value Added Tax (VAT), Service Tax, Excise Duty, Entry Tax, and Luxury Tax, creating a unified taxation framework under the slogan "One Nation, One Tax."

GST is collected at each point of sale, allowing businesses to claim **Input Tax Credit (ITC)** on taxes paid during raw material purchases. This avoids double taxation and reduces the cascading effect of taxes on the end consumer.

Understanding the Three Components: CGST, SGST, and IGST

Under India's dual GST system, taxes are split depending on the trade route of the transaction:

• CGST (Central Goods and Services Tax): Levied by the Central Government on intra-state transactions (sales within the same state).
• SGST (State Goods and Services Tax): Levied by the State Government on intra-state transactions.
• IGST (Integrated Goods and Services Tax): Levied by the Central Government on inter-state transactions (sales from one state to another). The revenue is subsequently shared between the center and the destination state.

For any intra-state trade, the total GST rate is divided equally between CGST and SGST. For example, on an 18% GST invoice, 9% is allocated to CGST and 9% to SGST. The DigitalFino GST calculator automatically performs this split.

How to Calculate GST: Mathematical Formulas

GST calculations depend on whether the initial transaction price includes or excludes the tax:

1. GST Exclusive (Tax is added to the base price)

If you have a base price and want to add tax, use these formulas:

GST Amount = (Base Price × GST Rate) / 100
Gross Amount = Base Price + GST Amount

Example: A service costs ₹10,000 exclusive of 18% GST.

• GST Amount = (10,000 × 18) / 100 = ₹1,800 (split as ₹900 CGST and ₹900 SGST).
• Gross Amount = 10,000 + 1,800 = ₹11,800.

2. GST Inclusive (Tax is already built into the price)

If you have the final price and want to calculate the pre-tax base price, use these formulas:

GST Amount = Gross Price - [Gross Price / (1 + (GST Rate / 100))]
Net Amount (Pre-Tax) = Gross Price - GST Amount

Example: A product costs ₹10,000 inclusive of 18% GST.

• GST Amount = 10,000 - [10,000 / (1 + 0.18)] = 10,000 - 8,474.58 = ₹1,525.42.
• Net Amount = ₹8,474.58.

Standard Indian GST Tax Slabs