About 18% GST Calculator
The 18% GST slab is widely used for many commercial goods and professional B2B services in India. Confirm the applicable rate for your specific HSN or SAC classification.
Use this calculator when 18% is the rate applicable to your transaction. This calculation does not determine an HSN or SAC classification or verify its GST treatment.
Use this calculator to add 18% GST to your base price or reverse-calculate the pre-tax base amount from an 18% GST inclusive total.
18% GST Calculation Formula
18% GST Amount = Base Amount × 0.18Base Amount = Total Price × 100 ÷ 118For intra-state sales, 18% GST splits into 9% CGST and 9% SGST. For inter-state sales, 18% full IGST applies.
Example: 18% GST on IT Consulting Services (₹10,000 Base)
A software company invoices a client ₹10,000 for web application development.
The client pays ₹11,800. The ₹1,800 tax component can be claimed as Input Tax Credit (ITC) by a registered business.