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