Introduction
GST (Goods and Services Tax) unified indirect taxation across India from July 2017. Businesses quote prices exclusive or inclusive of GST; intra-state sales split tax into CGST and SGST, while inter-state sales use IGST at the combined rate.
Numverto GST Calculator adds or removes GST at common slab rates (5%, 12%, 18%, 28%) with a clear CGST/SGST breakdown. Learn the rules in our GST calculation guide.
GST Calculation Formulas
GST Amount = (Taxable Value × GST Rate) / 100. Add GST: Final = Taxable + GST. Remove GST: Taxable = Final / (1 + Rate/100). Intra-state: CGST = SGST = GST/2. Inter-state: IGST = full GST.
Step-by-Step Examples
Example: Add 18% GST to ₹10,000
GST = ₹1,800. Final price = ₹11,800. CGST and SGST each ₹900 for intra-state.
Example: Remove 18% GST from ₹11,800
Taxable value = 11800 / 1.18 = ₹10,000. GST component = ₹1,800.
Real-Life Applications
- Invoice preparation for small businesses and freelancers
- Verifying restaurant and retail bills
- E-commerce seller pricing decisions
- CA foundation and commerce exam practice
- Quick reverse-GST for expense reporting
Advantages of Using This GST Calculator
- Add or remove GST in one interface
- Preset Indian GST slab rates
- CGST/SGST/IGST breakdown display
- Indian rupee formatting throughout
- Instant updates as amount or rate changes
Common Mistakes to Avoid
- Applying CGST and SGST rates separately instead of halving total GST
- Using wrong slab for product category
- Reverse calculation with addition instead of division
- Forgetting that some items are zero-rated or exempt
- Mixing pre-GST and post-GST price labels on invoices
Learn More
GST Calculator for India
Goods and Services Tax (GST) is India's unified indirect tax, effective since July 2017. It replaced multiple taxes (VAT, Service Tax, Excise Duty) with a single nationwide system. Whether you are a business owner creating invoices, a consumer verifying bills, or a student learning Indian taxation, this GST calculator gives you instant results with CGST and SGST breakdown.
How to Use This GST Calculator
- Enter the amount: type the base price (before GST) or the GST-inclusive price, depending on your need.
- Select the GST rate: choose from 5%, 12%, 18%, or 28%. Use "Custom" for special rates.
- Choose the mode: click "Add GST" to calculate total from base, or "Remove GST" to extract the base price from an inclusive amount.
- View results: see GST amount, CGST, SGST split, and total instantly.
- Compare slabs: scroll down to see how much GST you'd pay under each slab via the comparison chart.
GST Rate Slabs in India: Complete Table
| GST Rate | Category | Example Items |
|---|---|---|
| 0% (Exempt) | Essential goods & services | Fresh fruits, vegetables, milk, curd, eggs, bread, salt, healthcare services, education |
| 5% | Mass consumption items | Sugar, tea, coffee, edible oil, railway tickets, economy flight, footwear under ₹1000 |
| 12% | Standard goods | Processed food, computers, mobile phones, business class flights, gym memberships |
| 18% | Most services & goods | IT services, restaurants (with AC), financial services, telecom, branded garments, cameras |
| 28% | Luxury & sin goods | Cars, luxury watches, aerated drinks, tobacco, cement, AC, dishwashers, 5-star hotels |
Note: Some items attract additional cess on top of 28%, for example, luxury cars (up to 22% cess) and tobacco products.
CGST vs SGST vs IGST Explained
GST in India has three components, and which one applies depends on whether the transaction is within the same state or across states:
- CGST (Central GST): Collected by the Central Government. Applies on intra-state sales. Rate = half of total GST rate.
- SGST (State GST): Collected by the State Government. Applies on intra-state sales. Rate = half of total GST rate.
- IGST (Integrated GST): Collected by the Central Government on inter-state transactions. Rate = full GST rate. Central government then settles with the destination state.
Example: A Delhi-based seller sells goods worth ₹10,000 at 18% GST:
- To a buyer in Delhi (intra-state): CGST = ₹900, SGST = ₹900, Total = ₹11,800
- To a buyer in Mumbai (inter-state): IGST = ₹1,800, Total = ₹11,800
The total amount paid by the buyer is the same; only the split and collection mechanism differs.
How to Calculate GST Manually
Adding GST (Exclusive to Inclusive)
Formula: Total = Base Price × (1 + Rate/100)
Example: Product costs ₹5,000 + 18% GST
- GST Amount = ₹5,000 × 18/100 = ₹900
- CGST = ₹900 / 2 = ₹450
- SGST = ₹900 / 2 = ₹450
- Total Invoice = ₹5,000 + ₹900 = ₹5,900
Removing GST (Inclusive to Exclusive)
Formula: Base = Total / (1 + Rate/100)
Example: Bill shows ₹11,800 (18% GST included)
- Base Price = ₹11,800 / 1.18 = ₹10,000
- GST Amount = ₹11,800 - ₹10,000 = ₹1,800
- CGST = ₹1,800 / 2 = ₹900
- SGST = ₹1,800 / 2 = ₹900
Common GST Calculation Mistakes
- Applying GST on GST-inclusive price: If the MRP already includes GST, you should remove GST (not add again). Many small shops make this error, resulting in double taxation.
- Using wrong HSN/SAC code: Different products have different rates. Using a wrong code means applying wrong rate, which can trigger notices during GST audits.
- Confusing IGST with CGST+SGST: Inter-state sales need IGST; intra-state needs CGST+SGST. Mixing them up creates ITC mismatch and compliance issues.
- Not accounting for Cess: Items at 28% may have additional compensation cess (cars, tobacco, luxury). Forgetting cess means under-invoicing.
- Rounding errors on large invoices: GST should be calculated on the total taxable value, not line-by-line with rounding on each item. Cumulative rounding errors can cause GSTR filing mismatches.
GST for Different Business Types
Retailers & Shopkeepers
Must display GST-inclusive MRP. For B2B sales, issue tax invoices with GSTIN, HSN codes, and proper CGST/SGST or IGST split. Composition scheme available for turnover under ₹1.5 crore (pay flat 1-6% without ITC).
Service Providers
Most services fall under 18% GST (SAC codes). Includes IT services, consulting, marketing, legal, and accounting. Must file GSTR-1 (outward) and GSTR-3B (summary) monthly or quarterly depending on turnover.
E-commerce Sellers
Mandatory GST registration regardless of turnover. TCS (Tax Collected at Source) at 1% deducted by marketplace (Amazon, Flipkart). Must reconcile TCS with actual GST liability each month.
Freelancers & Consultants
Registration required if turnover exceeds ₹20 lakh (₹10 lakh for special category states). Export of services is zero-rated (0% GST with refund on inputs). Domestic clients pay 18% on your invoices.