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GST Calculator

Calculate GST addition or removal at 0%, 5%, 12%, 18%, or 28% with CGST, SGST, and IGST breakdowns.

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Standard & Special Slabs
0% – 22%

Supply Location

Intra-state (CGST + SGST)

Reverse Charge (RCM under Sec 9(3))
E-Way Bill Mandatory (Rule 138): Consignment value exceeds ₹50,000. Generating an electronic waybill (Form GST EWB-01) is legally required before goods movement.
E-Invoicing Reminder (Rule 48(4)): Mandatory for all B2B and export supplies if aggregate annual turnover exceeds ₹5 Crores in any prior financial year.
Tax Summary
Net (Taxable) Amount₹50,000
Total GST (18%)+ ₹9,000
Central GST (CGST - 9%)₹4,500
State / UT GST (SGST - 9%)₹4,500
Total Invoice Value

₹59,000

Effective GST incidence: 15.3% of gross

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GST Indirect Tax Counsel & ITC Advisor

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Statutory Guide & Methodology

Understanding GST Calculator

Goods and Services Tax (GST) is India's comprehensive multi-stage destination-based indirect tax levied on every value addition. Determining the exact GST amount—whether adding tax to a net base price or extracting tax from a maximum retail price (MRP)—is essential for statutory invoicing, compliance, and cash-flow management.

In intra-state sales (within the same state), GST is split equally into Central GST (CGST) and State GST (SGST). In inter-state transactions or export supplies, Integrated GST (IGST) applies as a unified single rate.

Core Calculation FormulaOfficial Rule
GST Amount = (Base Amount × GST Rate) ÷ 100 | Total = Base + GST
Exclusive GST (Add Tax): Tax = (Price × Rate) / 100; Total = Price + Tax
Inclusive GST (Remove Tax): Base = (Total Price × 100) / (100 + Rate); Tax = Total Price - Base

* Standard GST statutory brackets in India are 0%, 5%, 12%, 18%, and 28%.

Key Regulatory Rules & Thresholds (FY 2025–27)

Essential departmental provisions, tax brackets, and statutory compliance mandates.

Rule 36(4) Strict GSTR-2B Matching

Rule 36(4)

Input Tax Credit (ITC) can only be claimed if your vendor has uploaded the invoice in their GSTR-1 and it appears in your auto-populated GSTR-2B.

Mandatory Registration Thresholds

Sec 22

Aggregate turnover exceeding ₹40 Lakhs for exclusive goods (normal states) or ₹20 Lakhs for services triggers mandatory GST registration.

Rule 86B Minimum 1% Cash Payment

Rule 86B

Businesses with monthly taxable turnover exceeding ₹50 Lakhs must pay at least 1% of output tax liability in cash via Challan PMT-06.

Export Under Letter of Undertaking (LUT)

Zero-Rated

Software consultancies and SaaS exporters can export services at 0% GST by filing Form GST RFD-11 LUT annually.

Frequently Asked Questions

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