How do I calculate GST from an amount before tax?

Use Amount is before GST mode. Enter amount, rate and tax type to get GST amount and final invoice total.

Can I split tax into CGST and SGST or use IGST?

Yes. Toggle interstate invoice to compute IGST. Keep it off for intra-state invoices to split tax into CGST and SGST.

Can this calculator adjust GST payable using input tax credit (ITC)?

Yes. Enter ITC amount to see net GST payable and any carry-forward credit.

GST Calculator for India

Built for real invoices: quantity, discount, CGST/SGST or IGST split, and ITC-adjusted net GST payable.

Quick Presets

ModeUnit Amount (₹)QuantityDiscount (%)GST Rate (%)Input Tax Credit (₹)

Quick Rates

Tax TypeInterstate invoice (IGST)

Gross Input

₹1,000.00

Discount

₹0.00

Net Input Value

₹1,000.00

Taxable Value

₹1,000.00

GST Amount

₹180.00

Invoice Total

₹1,180.00

CGST (9%): ₹90.00 and SGST (9%): ₹90.00

ITC considered: ₹0.00

Net GST payable now: ₹180.00

Rounded invoice suggestion: ₹1,180.00

Round-off adjustment: +₹0.00

Useful when invoices must be presented as whole rupees while retaining exact GST breakdown in books.

Rate Comparison (Same Inputs)

5% GST

₹1,050.00

GST: ₹50.00

12% GST

₹1,120.00

GST: ₹120.00

18% GST

₹1,180.00

GST: ₹180.00

28% GST

₹1,280.00

GST: ₹280.00

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Arthalekh GST Calculation Summary
Mode: Amount entered before GST
Amount: ₹1,000.00 x Qty 1
Discount: 0% (₹0.00)
Net entered value: ₹1,000.00
Taxable value: ₹1,000.00
GST amount: ₹180.00
Invoice total: ₹1,180.00
CGST (9%): ₹90.00 | SGST (9%): ₹90.00
Input Tax Credit used: ₹0.00
Net GST payable: ₹180.00
Rounded invoice suggestion: ₹1,180.00 (+₹0.00)

Embed This Calculator

Paste this iframe into your blog, CMS, or Notion page to reuse the same tool.

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Educational utility only. Validate final invoice values and compliance rules with your CA or GST practitioner.