GST Calculator — Add/Remove GST with CGST/SGST/IGST Split

GST (Goods and Services Tax) is India’s indirect tax on the supply of goods and services. The calculator handles both modes: add GST (when your price is exclusive of tax — typical for B2B) and remove GST (when your price is inclusive — typical for retail). It also splits the tax into CGST + SGST (intra-state) or IGST (inter-state).

GST Calculator

Add or remove GST on any amount — with intra-state CGST+SGST or inter-state IGST split.

Currency: ₹ INR(India-focused)

GST Breakdown

Total GST–
Net Amount (Pre-GST)–
Total Amount (Inc-GST)–
CGST–
SGST / IGST–

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GST Slabs in India

SlabCommon Items
0%Fresh produce, milk, salt, books
5%Tea, sugar, edible oil, branded paneer, transport
12%Frozen meat, butter, cheese, mobile phones
18%Most services, electronics, processed food, clothing > ₹1000
28%Luxury cars, ACs, refrigerators, soft drinks, tobacco

CGST + SGST vs IGST

  • Intra-state (buyer and seller in same state): GST split equally between Central GST (CGST) and State GST (SGST). 18% becomes 9% + 9%.
  • Inter-state (buyer and seller in different states): full amount goes to Integrated GST (IGST), later distributed between centre and destination state.
  • Exports: Zero-rated. No GST charged, but input tax credit (ITC) is fully refundable.

Exclusive vs Inclusive Price

If price is exclusive (add GST): GST = Price × Rate; Total = Price + GST
If price is inclusive (remove GST): Net = Price ÷ (1 + Rate); GST = Price − Net
Example: Price ₹1,000, GST 18%. Exclusive: GST ₹180, Total ₹1,180. Inclusive: Net ₹847.46, GST ₹152.54.

ITC — Input Tax Credit

If you’re GST-registered, you can claim back GST paid on business inputs against GST collected on outputs — paying only the net to the government. This is what makes GST a value-added tax: only the value-add at each stage gets taxed.

Frequently Asked Questions

Is GST registration mandatory?▾
Yes if your turnover exceeds ₹40 lakh (₹20 lakh for service providers in special category states; ₹10 lakh for some). Voluntary registration is also allowed and lets you claim ITC.
What’s the difference between regular and composition scheme?▾
Composition scheme: small businesses (turnover < ₹1.5 cr) pay a flat low rate (1–5%) but cannot collect GST from customers or claim ITC. Simpler but loses ITC benefit.
Are returns monthly or quarterly?▾
GSTR-1 (sales) and GSTR-3B (summary + tax payment) are monthly for taxpayers above ₹5 cr turnover; quarterly under QRMP scheme for smaller. Annual return GSTR-9 by 31 December.
Is reverse charge mechanism (RCM) common?▾
RCM applies on specific notified services (legal, transport, GTA) and on purchases from unregistered suppliers. Buyer pays GST directly to government instead of supplier.

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