Free Online GST Calculator (CGST, SGST, IGST) 2026
Instant GST inclusive and exclusive tax computation with real-time CGST, SGST, and IGST tax segregation as per Central GST Act provisions.
D BIZ GST Calculator
Calculate Goods & Services Tax (GST), CGST, SGST, and IGST for invoices and price quotes.
Calculation Settings
GST Calculation Breakdown18% Slab
D BIZ Compliance Tip:
Businesses with turnover exceeding ₹40 Lakhs (goods) or ₹20 Lakhs (services) are legally required to obtain GST registration. D BIZ files GST returns starting at ₹499/month.
Statutory GST Mathematical Formulas
As of September 30, 2026, GST registration is legally mandatory for service providers with annual turnover exceeding ₹20 Lakhs (₹10 Lakhs in Special Category States) and suppliers of goods exceeding ₹40 Lakhs (₹20 Lakhs in Special Category States). Interstate supplies and e-commerce sellers require mandatory GST registration irrespective of turnover thresholds.
For intra-state transactions, Central Tax (CGST) is exactly 50% and State Tax (SGST) is 50% of the total GST amount. For inter-state supplies, 100% of the levy is collected as Integrated Tax (IGST).
How to Use the GST Calculator (CGST, SGST, IGST)
Enter Transaction Amount
Input your gross sales value or net procurement cost in Indian Rupees (INR).
Select Tax Mode & Slab
Choose whether the price is GST Exclusive (adding tax) or GST Inclusive (tax already built-in), and pick the applicable rate (5%, 12%, 18%, or 28%).
Choose Supply Jurisdiction
Select Intra-State (same state) for 50/50 CGST+SGST split, or Inter-State for 100% IGST.
Review & Generate Invoice
Instantly copy the calculated values or export them directly to D BIZ Smart Invoice Maker.
Key Highlights & Capabilities
Frequently Asked Questions (FAQs)
How do I calculate GST inclusive price vs GST exclusive price?
To add GST (Exclusive): Multiply the base price by the GST rate and divide by 100, then add this to the base price. To extract GST from a total bill (Inclusive): GST Amount = Total Bill - [Total Bill × {100 ÷ (100 + GST Rate)}].
What is the difference between CGST, SGST, and IGST?
CGST (Central GST) and SGST (State GST) are levied equally when the supplier and buyer are located within the same state (Intra-state supply). IGST (Integrated GST) is charged when goods or services move from one state to another (Inter-state supply) or in cases of import/export.
What is the mandatory threshold for GST registration in 2026?
In 2026, businesses with an aggregate annual turnover exceeding ₹40 Lakhs for goods (₹20 Lakhs for special category northeastern/hill states) and ₹20 Lakhs for services (₹10 Lakhs for special category states) must obtain GST registration within 30 days of crossing the threshold.
Can I claim Input Tax Credit (ITC) on all GST paid?
You can claim ITC on business purchases provided the invoice is uploaded by your supplier and reflected in your GSTR-2B statement, and the expenses are not blocked under Section 17(5) of the CGST Act (e.g., personal consumption, motor vehicles with seating <= 13, food and beverages).
Need Custom Corporate Advisory or Audit Filing?
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