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GST Calculator (India) | Complete Guide for Businesses & Freelancers (2026)
Calculate Goods and Services Tax (GST) for India quickly and accurately. Our free GST calculator supports both inclusive and exclusive GST calculations across all standard rates — 5%, 12%, 18%, and 28%. Whether you are a business owner preparing invoices, a freelancer quoting clients, or an accountant verifying tax figures, this tool gives you instant results with a detailed breakdown of CGST and SGST components.
What is GST in India?
Goods and Services Tax (GST) is an indirect tax system introduced in India on 1 July 2017 to replace multiple taxes such as VAT, Service Tax, and Excise Duty. Instead of paying different taxes to different authorities, businesses now pay one unified tax to the government.
GST is a consumption-based tax, meaning the tax is charged where the product or service is consumed, not where it is produced. The end customer ultimately pays the tax, while businesses collect and deposit it on behalf of the government.
When Does GST Apply?
GST applies whenever a taxable supply of goods or services takes place in India, including:
- Selling a product
- Providing a service
- Freelancing or consulting
- Subscription services
- Digital downloads
- E-commerce sales
| Business Type | GST Threshold |
|---|---|
| Goods business | ₹40 lakh |
| Service business | ₹20 lakh |
| Special category states | ₹10 lakh |
GST Slab Rates in India
| GST Rate | Category |
|---|---|
| 0% | Essential items |
| 5% | Basic necessities |
| 12% | Processed goods |
| 18% | Most services & goods |
| 28% | Luxury items |
CGST vs SGST vs IGST
GST is divided into three parts depending on buyer location.
| Situation | Tax Applied |
|---|---|
| Seller Delhi → Buyer Delhi | CGST + SGST |
| Seller Delhi → Buyer Maharashtra | IGST |
| Seller India → Foreign Client | 0% GST (Export) |
Real GST Invoice Example
A valid GST invoice must include:
- Seller name and GSTIN
- Invoice number & date
- Buyer details
- Item description
- Taxable value
- CGST/SGST or IGST
- Total invoice amount
Example:
Service Value: ₹10,000
GST (18%): ₹1,800
Total Invoice: ₹11,800
Who Must Register for GST?
- Businesses above turnover threshold
- Online sellers
- Freelancers with foreign clients
- Agencies and consultants
- Export service providers
Late Filing Penalties
| Return | Late Fee |
|---|---|
| GSTR-1 | ₹50/day |
| GSTR-3B | ₹50/day |
| Nil Return | ₹20/day |
GSTR-1 and GSTR-3B Explained
GSTR-1: Sales return showing all invoices issued.
GSTR-3B: Summary return used to pay tax.
GST Rules for Freelancers
- Foreign clients → 0% GST (export service)
- LUT filing required
- Registration still mandatory
Common GST Mistakes
- Wrong GST slab
- Missing returns
- Incorrect place of supply
- Charging GST but not depositing
How to Use This GST Calculator
- Enter the amount in the input field.
- Select whether the amount is GST Exclusive (add GST) or GST Inclusive (GST already included).
- Choose the applicable GST rate: 5%, 12%, 18%, or 28%.
- View the calculated GST amount, CGST, SGST, and total instantly.
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Frequently Asked Questions
Is GST mandatory for freelancers?
Only if turnover exceeds ₹20 lakh or you export services.
How do I calculate GST on an amount?
To calculate GST on an amount, multiply the base amount by the GST rate and divide by 100. For example, 18% GST on ₹10,000 = ₹10,000 × 18/100 = ₹1,800.
What are the GST rates in India?
India has four GST slabs: 5%, 12%, 18%, and 28%. Essential goods fall under 5%, standard goods under 12% or 18%, and luxury and sin goods under 28%.
Do I need GST for foreign clients?
Yes, but tax rate is 0% under export of services.
What is the difference between CGST and SGST?
CGST (Central GST) goes to the Central Government and SGST (State GST) goes to the State Government. Both are equal halves of the total GST for intra-state sales.
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