Calculate GST for any amount — exclusive or inclusive — with CGST & SGST breakdown.
Goods and Services Tax (GST) is an indirect tax used in India. It replaced multiple cascading taxes and is applied at rates of 0%, 5%, 12%, 18%, or 28%.
Exclusive: GST is added on top of the price (e.g., price ₹1000 + 18% GST = ₹1180). Inclusive: GST is already included in the stated price.
For intra-state transactions, GST is split equally into CGST (Central) and SGST (State). For inter-state, it's charged as IGST (Integrated).
Goods and Services Tax (GST) replaced a stack of older indirect taxes in India — VAT, service tax, excise duty, and others — with a single tax applied at the point of sale. It sounds simple, but GST math still confuses people because the same tax can be added on top of a price or already baked into it, and the correct approach depends entirely on how the price was originally quoted to you.
When a price is GST-exclusive, the listed price is the base amount and GST gets added on top at checkout — a ₹1,000 item with 18% GST becomes ₹1,180 on the final bill. When a price is GST-inclusive, the ₹1,180 figure is what you were quoted from the start, and the GST portion is already sitting inside it — extracting it means working backward: GST amount = Price − (Price ÷ (1 + rate)). Mixing these two up is the single most common billing mistake with GST, and it's why this calculator offers both directions rather than assuming one.
GST isn't collected as one single line item — it's split depending on whether the buyer and seller are in the same state or different states:
This split matters for businesses filing GST returns, since CGST, SGST, and IGST are tracked and reconciled separately even though the buyer usually just sees one total tax amount.
India currently applies GST at 0%, 5%, 12%, 18%, or 28% depending on the category of goods or services — essential items are typically taxed at 0% or 5%, standard goods and most services at 12–18%, and luxury or "sin" goods (like tobacco or high-end vehicles) at 28%, sometimes with an additional cess on top.
Divide the total by (1 + GST rate as a decimal) to get the base price, then subtract that from the total to get the GST amount. This calculator's "inclusive" mode does this automatically.
The rate slabs are set nationally, but which slab applies depends on the specific goods/service category, not the state — the CGST/SGST split (rather than the total rate) is what changes based on whether the transaction is within one state or across states.
Yes, it's useful for quickly checking GST math before issuing an invoice, though for official filing you should always verify figures against your accounting software or a tax professional.