GST Calculator
Calculate GST with multiple calculation types - Basic, Invoice, and Return calculations
GST Rate Guide
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About GST (Goods and Services Tax)
GST (Goods and Services Tax) is India's comprehensive indirect tax system that replaced multiple taxes like VAT, Service Tax, Excise Duty, and others. Implemented on July 1, 2017, GST is levied on the supply of goods and services at every stage of the supply chain. It's a destination-based tax, meaning tax is collected at the point of consumption rather than production. GST operates on the principle of "One Nation, One Tax" and has simplified India's complex tax structure. The tax is administered jointly by the Central and State governments through the GST Council, which decides on tax rates, exemptions, and policy matters.
GST is structured into four main tax slabs: 5%, 12%, 18%, and 28%, with some essential items being exempt (0% GST). The tax is further divided into CGST (Central GST), SGST (State GST), and IGST (Integrated GST). For intra-state transactions, both CGST and SGST are applicable, while inter-state transactions attract IGST. This structure ensures that both central and state governments receive their share of tax revenue. GST also includes provisions for Input Tax Credit (ITC), allowing businesses to claim credit for taxes paid on inputs, thereby avoiding the cascading effect of taxes.
Understanding GST calculation is crucial for businesses, professionals, and consumers. Businesses need to calculate GST for pricing products, preparing invoices, and filing returns. The tax can be calculated as GST-exclusive (adding GST to base price) or GST-inclusive (extracting GST from total price). Proper GST calculation ensures compliance with tax laws, accurate pricing, and correct filing of returns. Non-compliance can result in penalties, interest charges, and legal complications. Our comprehensive GST calculator helps you perform various GST calculations including basic GST computation, invoice preparation, and return filing calculations.
GST registration is mandatory for businesses with annual turnover exceeding ₹40 lakh for goods (₹20 lakh for services). Special category states have lower thresholds of ₹20 lakh for goods and ₹10 lakh for services. Registered businesses must file monthly or quarterly returns, maintain proper records, and issue GST-compliant invoices. The system promotes transparency, reduces tax evasion, and creates a unified national market. Understanding GST is essential for business success in India's modern economy.
GST Calculation Formulas
GST Exclusive Calculation:
GST Amount = (Base Amount × GST Rate) / 100
Total Amount = Base Amount + GST Amount
GST Inclusive Calculation:
Base Amount = (Total Amount × 100) / (100 + GST Rate)
GST Amount = Total Amount - Base Amount
Invoice GST Calculation:
CGST = (Amount × CGST Rate) / 100
SGST = (Amount × SGST Rate) / 100
IGST = (Amount × IGST Rate) / 100 (for inter-state)
GST Rate Structure in India (2026)
| GST Rate | Category | Examples |
|---|---|---|
| 0% (Exempt) | Essential Items | Fresh fruits, vegetables, milk, bread, salt |
| 5% | Basic Necessities | Sugar, tea, coffee, spices, medicines |
| 12% | Processed Foods | Butter, cheese, dry fruits, mobile phones |
| 18% | Standard Rate | Most goods, IT services, restaurants |
| 28% | Luxury Items | Cars, AC, refrigerator, tobacco |
GST Registration Process
Registration Requirements
- • Turnover > ₹40L (goods) or ₹20L (services)
- • Inter-state supply of goods/services
- • E-commerce operators
- • Input service distributors
- • Casual taxable persons
- • Non-resident taxable persons
Documents Required
- • PAN card of business/proprietor
- • Aadhaar card of authorized signatory
- • Business registration certificate
- • Address proof of business premises
- • Bank account details
- • Digital signature (for companies)
How to Apply for GST Registration
Visit GST Portal
Go to www.gst.gov.in
Fill GST REG-01
Complete application form
Upload Documents
Submit required papers
Get GSTIN
Receive 15-digit number
GST Return Filing
Monthly Returns
- • GSTR-1: Outward supplies
- • GSTR-3B: Summary return
- • Due: 20th of next month
Quarterly Returns
- • For small taxpayers (QRMP)
- • Turnover < ₹5 crore
- • Monthly payment, quarterly filing
Annual Return
- • GSTR-9: Annual return
- • Due: December 31st
- • Reconciliation of monthly returns
Input Tax Credit (ITC)
✅ ITC Available On
- • Raw materials for production
- • Capital goods for business
- • Input services for business
- • Goods for further supply
- • Business-related expenses
❌ ITC Not Available On
- • Personal consumption items
- • Food, beverages for employees
- • Motor vehicles (except specified)
- • Membership of clubs, gyms
- • Goods/services for personal use
GST Composition Scheme
The Composition Scheme is a simplified GST compliance mechanism for small businesses with turnover up to ₹1.5 crore. Under this scheme, businesses pay GST at a fixed rate on their turnover instead of the regular GST rates.
Composition Rates (2026)
- • Manufacturers: 1% of turnover
- • Traders: 0.5% of turnover
- • Restaurants: 5% of turnover
- • Service Providers: 6% of turnover
Benefits
- • Lower tax rates
- • Simplified compliance
- • Quarterly return filing
- • Reduced paperwork
Restrictions
- • No input tax credit
- • No inter-state supply
- • Cannot issue tax invoices
- • Limited business activities
GST Exemptions
Exempt Goods (0% GST)
- • Fresh fruits and vegetables
- • Milk and milk products (natural)
- • Cereals and grains
- • Salt and jaggery
- • Newspapers and books
- • Contraceptives and blood
Exempt Services (0% GST)
- • Healthcare services
- • Educational services
- • Religious services
- • Government services
- • Agricultural services
- • Public transport services
E-Way Bill System
E-Way Bill is an electronic document required for movement of goods worth more than ₹50,000. It ensures proper tracking of goods movement and prevents tax evasion.
When Required
- • Goods value > ₹50,000
- • Inter-state movement
- • Intra-state (if state mandates)
- • Job work movement
Validity Period
- • <100 km: 1 day
- • 100-300 km: 3 days
- • 300-1000 km: 5 days
- • >1000 km: 10 days
Who Can Generate
- • Consignor (supplier)
- • Consignee (recipient)
- • Transporter
- • Registered person
Penalties
- • ₹10,000 or tax amount
- • Detention of vehicle
- • Seizure of goods
- • Interest on tax due
GST Audit & Assessment
GST Audit Requirements
- • Turnover > ₹2 crore: Mandatory audit
- • Annual return filing with audit report
- • Chartered Accountant certification required
- • Due date: December 31st annually
- • Form GSTR-9C submission
- • Reconciliation of books with returns
Assessment Types
- • Self-assessment by taxpayer
- • Provisional assessment (pending documents)
- • Summary assessment (return scrutiny)
- • Detailed assessment (comprehensive review)
- • Best judgment assessment (non-cooperation)
- • Assessment of non-filers
GST Penalties & Interest
Late Filing Penalties
- • GSTR-1: ₹50 per day (max ₹5,000)
- • GSTR-3B: ₹50 per day per act
- • Annual Return: ₹100 per day
- • Minimum penalty: ₹500
Tax Evasion Penalties
- • 10% of tax evaded (minimum ₹10,000)
- • 50% for suppression of turnover
- • 100% for fake invoices
- • Prosecution if evasion > ₹5 crore
Interest Rates (2026)
- • Delayed payment: 18% per annum
- • Delayed refund: 6% per annum
- • Calculated from due date
- • Compounded monthly
GST Refund Process
Refund Categories
- • Export refunds (zero-rated supplies)
- • Excess payment refunds
- • Input tax credit refunds
- • Inverted duty structure refunds
- • Refund to UN bodies, embassies
- • Deemed export refunds
Refund Process Timeline
- • Application filing: Form GST RFD-01
- • Acknowledgment: Within 15 days
- • Processing: 60 days from filing
- • Provisional refund: 90% within 7 days
- • Final refund: After verification
- • Interest: 6% if delayed beyond 60 days
Sector-wise GST Rates (2026)
| Sector | GST Rate | Key Items | Special Notes |
|---|---|---|---|
| Healthcare | 0-12% | Medicines (5%), Medical devices (12%) | Life-saving drugs exempt |
| IT Services | 18% | Software, consulting, maintenance | Export services: 0% |
| Automobiles | 12-28% | Two-wheelers (12%), Cars (28%) | Electric vehicles: 5% |
| Textiles | 5-12% | Cotton (5%), Synthetic (12%) | Handloom products: 0% |
| Real Estate | 1-12% | Affordable housing (1%), Premium (12%) | Resale properties: 0% |
| Financial Services | 18% | Banking, insurance, mutual funds | Some services exempt |
GST Compliance Calendar 2026
Monthly Deadlines
- • 11th: GSTR-1 filing
- • 13th: GSTR-6 (ISD)
- • 20th: GSTR-3B filing & payment
- • 25th: TDS return (GSTR-7)
Quarterly Deadlines
- • QRMP taxpayers: GSTR-1 & 3B
- • Composition dealers: CMP-08
- • TCS return: GSTR-8
- • Due: 18th of next quarter
Annual Deadlines
- • Dec 31: GSTR-9 (Annual return)
- • Dec 31: GSTR-9C (Audit report)
- • Jan 31: Form 26AS reconciliation
- • Mar 31: Financial year end
Important Reminders
- • File returns even if no business
- • Pay tax before filing returns
- • Maintain proper invoice records
- • Regular ITC reconciliation
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Frequently Asked Questions
What are the different GST rates in India?
India has four main GST slabs: 0% (exempt items like fresh food), 5% (essential items like sugar, tea), 12% (processed foods, mobile phones), 18% (most goods and services), and 28% (luxury items like cars, AC). The rate depends on the HSN/SAC code of the product or service.
What is the difference between CGST, SGST, and IGST?
CGST (Central GST) and SGST (State GST) apply to intra-state transactions, with both central and state governments collecting their share. IGST (Integrated GST) applies to inter-state transactions, collected by the central government and later distributed to states.
Who needs to register for GST?
GST registration is mandatory if annual turnover exceeds ₹40 lakh for goods or ₹20 lakh for services. For northeastern states, limits are ₹20 lakh for goods and ₹10 lakh for services. Inter-state suppliers, e-commerce operators, and certain other categories must register regardless of turnover.
How to calculate GST on invoices?
For intra-state: Split total GST equally between CGST and SGST (e.g., 18% = 9% CGST + 9% SGST). For inter-state: Apply full rate as IGST (e.g., 18% IGST). Use GST-exclusive calculation: GST = (Amount × Rate)/100, Total = Amount + GST.
What is Input Tax Credit (ITC)?
ITC allows businesses to claim credit for GST paid on purchases against GST collected on sales. This prevents cascading of taxes. ITC is available on business inputs, capital goods, and input services, but not on personal consumption items or blocked credits like motor vehicles.
What are the penalties for GST non-compliance?
Penalties include late fees (₹50 per day per return), interest (18% p.a. on tax due), penalty for non-filing (₹10,000 or 0.25% of turnover), and prosecution for tax evasion above ₹5 crore. Voluntary disclosure can reduce penalties.
How often do I need to file GST returns?
Regular taxpayers file monthly (GSTR-1 and GSTR-3B). Small taxpayers under QRMP scheme (turnover < ₹5 crore) can file quarterly with monthly tax payment. Annual return (GSTR-9) is due by December 31st for all registered taxpayers.
Can I revise GST returns after filing?
GSTR-1 can be amended in the next month's return. GSTR-3B cannot be revised but errors can be corrected in subsequent returns. Annual return allows reconciliation of monthly returns. Late corrections may attract interest and penalties.