GST Calculator
Calculate GST amount, net value, and gross value.
What is GST?
GST (Goods and Services Tax) is a comprehensive indirect tax levied on the supply of goods and services. It replaced multiple cascading taxes (VAT, excise, service tax, etc.) with a unified system. GST allows businesses to claim input tax credits, ensuring tax is only on the value added at each stage.
GST Calculation Formula
GST Amount = (Original Price * GST Rate) / 100. Total Price = Original Price + GST Amount. To remove GST from an inclusive price: Original Price = (Total Price * 100) / (100 + GST Rate). For example, a $1,000 item at 18% GST: GST = $180, Total = $1,180.
GST Rate Structure
- •GST has multiple rate slabs: 0% (essential items like fresh food, education, healthcare), 5% (household necessities), 12% (processed foods, computers), 18% (most goods and services), and 28% (luxury items, sin goods). Some items also attract a compensation cess on top of the 28% rate.
How Input Tax Credit Works
A manufacturer buys raw materials for $1,000 + $180 GST (18%). After processing, sells for $1,500 + $270 GST. The manufacturer pays only $90 net GST ($270 output - $180 input credit). This ensures tax is only on the $500 value added, not the full $1,500.
GST Compliance Requirements
- •Businesses must: register for GST if turnover exceeds the threshold, file monthly/quarterly returns (GSTR-1 for sales, GSTR-3B for summary), maintain proper invoices with GSTIN, reconcile input tax credits, and file annual returns. Non-compliance attracts penalties and interest.
Comparison Analysis
CGST vs SGST vs IGST
| Criteria | CGST | SGST | IGST |
|---|---|---|---|
| Levied By | Central Government | State Government | Central Government |
| Applicable On | Intra-state supply | Intra-state supply | Inter-state supply |
| Rate | Half of total GST rate | Half of total GST rate | Full GST rate |
| Revenue Goes To | Central Government | State Government | Shared (Central + Destination State) |
Content Verification
Expert Review
Reviewed by Deepak Gupta, Chartered Accountant (CA), GST Compliance Specialist
Authoritative Sources
Based on GST Council decisions, CBIC guidelines, and GST legislation
Last Reviewed
Content verified May 2026 against current GST rates and regulations