GST Calculator
Add GST to a pre tax amount or extract GST from an inclusive amount. Free Indian GST calculator with CGST plus SGST and IGST split for any rate.
உங்கள் முடிவைக் கணக்கிடுங்கள்
உங்கள் எண்களை உள்ளிடுங்கள். மாற்றும்போது மதிப்பீடும் வரைபடங்களும் புதுப்பிக்கும்.
GST
செப்டம்பர் 2025 சீர்திருத்தங்களின்படி 5%, 18%, 40% ஆகியவை விரைவுத் தேர்வுகளில் உள்ளன. உங்கள் வழங்கல் மற்றும் விலைப்பட்டியல் தேதிக்கான அறிவிக்கப்பட்ட விகிதத்தைப் பயன்படுத்தவும்; சிறப்பு மற்றும் முந்தைய விகிதங்கள் மாறுபடலாம். செஸ் சேர்க்கப்படவில்லை.
- அடிப்படை தொகை
- ₹10,000
- GST
- ₹1,800
- அடிப்படையின் 18%
- மொத்த தொகை
- ₹11,800
உங்கள் கணக்குகள் சொல்வது என்ன
Of every ₹100 in the final bill, ₹15.25 is GST.
A 18% rate is charged on the base price, so it works out to 15.3% of the GST-inclusive total — remember this when you read tax-inclusive prices.
₹900 goes to the Centre (CGST) and ₹900 to your state (SGST).
A sale within the same state splits GST equally between the central and state governments.
At the 5% slab, GST would be ₹1,300 lower.
The correct rate depends on the HSN/SAC classification of the goods or service, so check the classification before you bill or pay.
Your ₹10,000 price becomes ₹11,800 once GST is added.
Quote the GST-inclusive figure to customers so the final price holds no surprises.
வரி பிரிவு
| CGST (9%) | ₹900 |
| SGST (9%) | ₹900 |
உங்கள் கணக்கீட்டைப் புரிந்துகொள்ளுங்கள்
GST calculations depend on the notified rate for the supply and invoice date, not a universal list of seven slabs. The September 2025 reforms introduced main rates of 5 and 18 percent plus a 40 percent demerit rate, with exemptions and special rates still requiring classification checks. This calculator adds GST to a pre-tax amount or extracts it from an inclusive amount, and splits the result into CGST plus SGST or IGST.
GST Calculator ஐ எவ்வாறு பயன்படுத்துவது
- 1
Choose exclusive or inclusive mode
Exclusive if the amount is pre tax and you need to add GST. Inclusive if the amount already includes GST and you need to find the base and tax separately.
- 2
Enter the amount
The pre tax amount in exclusive mode, or the inclusive amount in inclusive mode. The calculator does the right computation based on your mode selection.
- 3
Pick the GST rate
Confirm the notified rate, HSN/SAC classification, supply date and any exemption or transition rule. Quick choices are 0%, 3%, 5%, 18% and 40%; a custom rate is also available.
- 4
Tick intra state or inter state
Intra state for supplies within the same state (CGST plus SGST split). Inter state for supplies across state borders (IGST). The total tax amount is the same; only the split differs.
- 5
Read base, GST and total
The calculator shows the base amount, the GST amount and the total. The split table shows CGST and SGST for intra state, or IGST for inter state.
உதாரணம்
Adding and removing 18% GST on ₹10,000
A ₹10,000 service at 18%, billed within the same state: GST = 10,000 × 18% = ₹1,800, split into ₹900 CGST and ₹900 SGST, so the invoice total is ₹11,800. Now reverse it: an inter-state invoice shows ₹11,800 including 18% GST. Base = 11,800 ÷ 1.18 = ₹10,000, GST = 11,800 − 10,000 = ₹1,800, all charged as IGST.
- Base amount
- ₹10,000
- GST at 18%
- ₹1,800
- CGST + SGST (intra-state)
- ₹900 + ₹900
- IGST (inter-state)
- ₹1,800
- Invoice total
- ₹11,800
Taking 18% of ₹11,800 (₹2,124) would overstate the GST. To extract GST from an inclusive price, divide by 1.18 first.
எவ்வாறு கணக்கிடப்படுகிறது
Exclusive mode adds GST to a pre-tax price: GST = amount × rate ÷ 100 and total = amount + GST. Inclusive mode works backwards from a price that already contains GST: base = amount ÷ (1 + rate ÷ 100) and GST = amount − base.
For an intra-state supply the GST is split evenly, CGST = SGST = GST ÷ 2, and IGST is zero. For an inter-state supply the whole amount is IGST and CGST/SGST are zero. Figures aren't rounded inside the calculation; round on the invoice as your billing rules require.
கருதுகோள்கள் மற்றும் வரம்புகள்
- Rate selection is the user's responsibility; no HSN/SAC classification or registration eligibility is inferred.
- Output GST excludes compensation cess and other levies.
- The intra-state split is the simplified CGST/SGST case; confirm place-of-supply rules and UTGST where applicable.
அடிக்கடி கேட்கப்படும் கேள்விகள்
What is the difference between CGST, SGST and IGST?
For intra state supplies (where the buyer and seller are in the same state), GST is split equally between Central GST (collected by the central government) and State GST (collected by the state government). For inter state supplies (across state borders), the same total GST is levied as Integrated GST and collected by the central government, which then settles with the destination state. The total tax burden is identical; only the split differs.
What are the common GST rates in India?
The September 2025 reforms introduced main rates of 5 and 18 percent and a 40 percent demerit rate, alongside exemptions and special rates. The original reform announcement deferred changes for certain tobacco products. Always confirm the applicable notification and supply date; this calculator does not determine classification or calculate compensation cess.
How do I extract GST from an MRP inclusive price?
Use the inclusive mode in the calculator. If a product costs 1,180 inclusive of 18 percent GST, the base price is 1,180 divided by 1.18 which equals 1,000. The GST component is 1,180 minus 1,000 which equals 180. The calculator does this division automatically.
What is reverse GST calculation?
Reverse GST means computing the base amount and GST separately when only the inclusive amount is known. The formula is base equals inclusive divided by (1 plus rate). The GST component is inclusive minus base. Useful when the supplier provides only the final price and you need the tax breakdown for accounting or input tax credit.
When is IGST applicable instead of CGST plus SGST?
IGST applies when the place of supply is different from the location of the supplier. For physical goods, this typically means the buyer is in a different state from the seller. For services, the rules depend on the nature of the service and the location of the recipient. The total tax is the same, but the split affects input tax credit utilisation rules in the GST returns.
Can I claim input tax credit on the GST I pay?
Yes, if you are GST registered and the input is used for taxable business supplies. The credit can be used to offset your output GST liability. Input tax credit rules differ for CGST, SGST and IGST: CGST credit can offset CGST and IGST output, SGST credit can offset SGST and IGST output, IGST credit can offset all three. The calculator does not handle input tax credit utilisation; that is a returns level computation.
Is GST applicable on every transaction?
No. Exempt, nil-rated, zero-rated and non-GST supplies have different legal treatment. Registration depends on turnover, state, supply type and compulsory-registration rules; being below a headline threshold is not a universal exemption. This calculator only computes tax for the rate you enter.