3%
5%
12%
18%
28%
%
Net Base Amount ₹ 10,000.00
Total GST Tax
₹ 1,800.00
CGST: ₹900 | SGST: ₹900
Final Total Amount ₹ 11,800.00

Simplifying Invoicing with the GST Calculator

The Goods and Services Tax (GST) is an indirect, comprehensive, multi-stage, destination-based tax that is levied on every value addition in India. For freelancers, shop owners, and corporate businesses, generating accurate invoices is a daily necessity. Our GST Calculator is a specialized tool built to help you calculate tax values effortlessly, ensuring that your billing process is both fast and compliant with the law.

Adding GST vs. Removing GST (Reverse Calculation)

Understanding CGST, SGST, and IGST

Depending on where the buyer and seller are located, GST is split differently on an invoice:

If the sale occurs within the same state (Intra-state), the total GST is split equally into two parts: CGST (Central GST) and SGST (State GST). For instance, an 18% GST will be billed as 9% CGST and 9% SGST. If the sale occurs between two different states (Inter-state), the entire 18% is billed as a single IGST (Integrated GST).

Frequently Asked Questions

What is the mathematical formula to calculate GST?

To Add GST: Final Amount = Base Amount + (Base Amount × GST% / 100).
To Remove GST: Base Amount = Final Amount / [1 + (GST% / 100)]. The tool automates these exact formulas for you.

What are the common GST slabs in India?

The GST council has defined four primary tax slabs: 5% (essential goods), 12% (standard goods), 18% (standard services and goods), and 28% (luxury items). There is also a special 3% rate for gold and precious stones.

Can I use a custom GST rate?

Yes. While the standard buttons cover the most common slabs (3%, 5%, 12%, 18%, 28%), you can use the "Custom Rate" input box to type in any specific percentage you require for specialized invoicing.