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GST Calculator India 2026 – Add/Remove GST at All Slabs
Use this free GST Calculator in India to add or remove Goods and Services Tax at any slab — 5%, 12%, 18%, or 28% — with a full CGST, SGST, and IGST breakdown.
Add or remove GST at 5%–28%
GST Amount
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Base Price
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GST Amount
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Total Amount
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❓ FAQs
How does this calculator work?▼
Enter the required values and click Calculate. Results appear instantly using standard financial formulas.
Is this free?▼
Yes, completely free. No login or signup required.
Are calculations accurate?▼
Yes, industry-standard formulas. For large decisions, consult a financial advisor.
📊 What is the GST Calculator and How Does It Work?
GST is applied as a percentage on the base price. For intra-state transactions it splits into CGST + SGST (50:50). For inter-state, it is IGST. This calculator works both ways — add GST to a base price or extract it from a GST-inclusive price.
Formula
GST Amount = Base × GST% / 100 | Reverse: Base = Inclusive Price / (1 + Rate/100)🪓 Step-by-Step: How to Use This Calculator
- Enter the amount (base price or GST-inclusive price)
- Select the GST rate (5%, 12%, 18%, or 28%)
- Choose Add GST or Remove GST (reverse calculate)
- Click Calculate to see breakdown: GST amount, CGST/SGST or IGST
📌 Example Calculation
Product base ₹10,000 at 18% GST: GST = ₹1,800 (CGST ₹900 + SGST ₹900). Total = ₹11,800. For interstate: IGST = ₹1,800.
✅ Benefits of Using This Calculator
- Quick GST calculation for any invoice
- Verify GST charged on bills and receipts
- Understand CGST, SGST, IGST breakdown
- Useful for businesses and freelancers
- Plan pricing strategy with GST included
- Calculate profit margin after GST impact
⚙️ Key Factors That Affect Results
- GST rate slab applicable (0%, 5%, 12%, 18%, 28%)
- Intra-state vs inter-state transaction
- Input Tax Credit for registered businesses
- Composition scheme for small businesses
- Exempt vs taxable supply classification
❓ Frequently Asked Questions
What are GST rates in India?▼
Four main slabs: 5% (essentials), 12% (processed food, some services), 18% (most goods and services), 28% (luxury goods, automobiles, tobacco).
What is the difference between CGST, SGST, and IGST?▼
CGST and SGST for intra-state sales, split 50:50. IGST for inter-state sales collected by central government.
Who must register for GST?▼
Businesses with turnover above ₹40 lakh (goods) or ₹20 lakh (services). Special category states have lower thresholds.
What is Input Tax Credit?▼
ITC lets businesses deduct GST paid on purchases from GST collected on sales. Only registered businesses can claim.
How is GST filed?▼
Monthly GSTR-1 and GSTR-3B, or quarterly under QRMP scheme. Annual GSTR-9 return by December 31.