title: GST Calculator description: Calculate Goods and Services Tax (GST) for different tax slabs, including reverse charge mechanism, composition scheme, and input tax credit.
GST Calculator
Understanding GST in India
Goods and Services Tax (GST) is India's comprehensive indirect tax on the supply of goods and services. Implemented on July 1, 2017, GST replaced multiple cascading taxes like VAT, service tax, excise duty, and more. Our GST calculator helps you compute forward and reverse GST, applicable rates, and net payable amounts for your business or personal purchases.
GST Structure in India
GST has four primary components:
CGST (Central GST)
Collected by the central government on intra-state supplies (within same state)
SGST (State GST)
Collected by state governments on intra-state supplies
IGST (Integrated GST)
Collected by central government on inter-state supplies (between states) and imports
UTGST (Union Territory GST)
For union territories without legislature (e.g., Chandigarh, Lakshadweep)
GST Tax Slabs
0% (Nil Rate)
Essential items like fresh fruits, vegetables, milk, eggs, bread, salt, bindi, sindoor, etc.
5%
Household necessities: sugar, tea, coffee (except instant), edible oils, spices, coal, fertilizers, medicines, transport services (rail/bus)
12%
Processed foods: frozen vegetables, butter, cheese, ghee, fruit juices, sausages, cell phones, umbrella, sewing machine
18%
Most goods and services: soaps, toothpaste, hair oil, fans, watches, ACs, refrigerators, computers, printers, restaurant services (non-AC), telecom services, financial services
28%
Luxury and sin goods: cars, motorcycles, aircraft, yachts, cigarettes, pan masala, aerated drinks, paint, cement, high-end appliances
Using the GST Calculator
Forward Calculation (Tax Exclusive Price)
Enter the net price (excluding GST) and GST rate to get:
- GST Amount: Tax to be paid (CGST + SGST or IGST)
- Gross Price: Final price including GST
Formula: GST Amount = (Original Cost × GST Rate) / 100
Reverse Calculation (Tax Inclusive Price)
Enter the gross price (including GST) to find:
- Original Price: Price before GST
- GST Amount: Tax component in the price
Formula: Original Price = (Gross Price × 100) / (100 + GST Rate)
Special GST Mechanisms
Reverse Charge Mechanism (RCM)
Under RCM, the recipient pays GST instead of the supplier. Applies to:
- Goods transport agencies (GTA) services by unregistered dealers
- Legal services by advocates
- Import of services
- Rent-a-cab services
Our calculator includes an RCM option to split tax liability correctly.
Composition Scheme
For small businesses with turnover under ₹1.5 crores (₹75 lakhs for special category states). Tax rates:
- Manufacturers: 1% (0.5% CGST + 0.5% SGST)
- Restaurant services: 5% (2.5% + 2.5%)
- Traders: 1% (0.5% + 0.5%)
Cannot claim input tax credit under composition scheme.
Input Tax Credit (ITC)
ITC allows businesses to reduce tax payable on output by tax already paid on inputs. Our calculator helps you compute net GST liability:
Net GST Payable = Output GST - Input Tax Credit
Example:
- Purchased raw materials: ₹1,00,000 + 18% GST (₹18,000 ITC)
- Sold finished goods: ₹2,00,000 + 18% GST (₹36,000 output)
- Net GST payable: ₹36,000 - ₹18,000 = ₹18,000
GST on Common Transactions
E-commerce
TCS (Tax Collected at Source) of 1% on net sales applies to e-commerce operators. The calculator helps sellers determine net realization.
Restaurants
- Non-AC restaurants: 5% GST (no ITC)
- AC restaurants: 5% GST (with ITC)
- 5-star hotel restaurants: 18% GST
Real Estate
- Affordable housing: 1% GST (without ITC)
- Other residential: 5% GST (without ITC)
- Commercial property: 12-18% GST (with ITC)
Example Calculations
Forward Calculation (Product Purchase)
- Net Price: ₹10,000
- GST Rate: 18%
- GST Amount: ₹1,800
- Gross Price: ₹11,800
Reverse Calculation (Restaurant Bill)
- Bill Amount: ₹2,100 (including 5% GST)
- Original Price: ₹2,000
- GST Amount: ₹100
Inter-state Sale (IGST)
- Net Price: ₹50,000
- IGST (18%): ₹9,000
- Total: ₹59,000
GST Filing Returns
| Return | Due Date | Applicability | |--------|----------|----------------| | GSTR-1 | 11th of next month | Outward supplies | | GSTR-3B | 20th of next month | Summary return | | GSTR-9 | December 31st | Annual return | | GSTR-9C | December 31st | Audit for turnover > ₹5 crores |
Common Mistakes in GST Calculation
- Wrong slab application: Using 18% when product is in 12% slab
- Ignoring interstate rules: Charging CGST+SGST instead of IGST
- Not claiming ITC: Missing eligible input tax credits
- RCM non-compliance: Not paying GST under reverse charge
- Composition scheme violations: Claiming ITC while on composition scheme
Frequently Asked Questions
Can I claim ITC on all purchases? No. Items like motor vehicles (except specified), food and beverages, health services, and rent-a-cab (specific cases) have restrictions.
What's the penalty for late GST payment? Interest at 18% per annum plus late fee of ₹50 per day (₹20 for nil return).
Is GST applicable on exports? Exports are zero-rated (0% GST) with refund of input taxes available.
How does composition scheme work for restaurants? Restaurants with turnover under ₹1.5 crores pay 5% GST (2.5% CGST + 2.5% SGST) but cannot claim ITC.
What is e-way bill and when required? Electronic way bill for movement of goods exceeding ₹50,000 (inter-state) or state-specific limits (intra-state).