GST Calculator

Add or remove GST from an amount at any slab rate.

Overview

Calculates Goods and Services Tax additions and reverse-extracts net base amounts from tax-inclusive retail invoices across standard statutory tax slabs.

Formula & Calculation Method

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

Exclusive mode adds tax onto net price. Inclusive mode extracts embedded GST component from MRP.

Worked Example: Extracting 18% GST from ₹11,800 Invoice

Inputs: Gross Amount = ₹11,800 | GST Rate = 18% (Inclusive)

  • Net base price = 11,800 × 100 / (100 + 18) = ₹10,000
  • Total GST component = ₹11,800 - ₹10,000 = ₹1,800
  • CGST (9%) = ₹900 | SGST (9%) = ₹900

Summary: Base Price = ₹10,000 | Total GST = ₹1,800 | Gross Total = ₹11,800

Common Use Cases

  • B2B Billing: Generate accurate tax breakdowns between CGST, SGST, and IGST for invoices.
  • Input Tax Credit (ITC): Reconcile input tax paid on supplier purchases for GST filings.
  • Retail Pricing: Determine wholesale product pricing before adding consumer GST slabs.

Frequently Asked Questions

When do I charge IGST versus CGST and SGST?

Charge IGST on inter-state sales and imports; split into equal CGST and SGST for sales within the same state.

What are the primary GST slabs in India?

Standard goods and services fall under 0%, 5%, 12%, 18%, and 28% slabs, with special 3% rates on gold.

What is Input Tax Credit (ITC)?

ITC lets businesses offset GST paid on purchase inputs against the GST collected on sales, preventing cascading taxes.

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