GST Bill Generator & Calculator India 2026 | Invoice with GST, Tax Rate & ITC
Free GST invoice calculator for Indian businesses. Calculate GST at 5%, 12%, 18%, 28% rates. Generate invoices with HSN codes, ITC (Input Tax Credit), SGST, CGST, IGST. Perfect for small businesses, e-tailers, and service providers.
Updated for 2026
By the GlobalCalqulate team, founded by Pavan Kusunuri · About our editorial standards
Frequently Asked Questions
Clear answers to common questions to help you use this calculator confidently.
How do I determine the correct HSN code for my product?
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How do I determine the correct HSN code for my product?
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HSN code can be found on the GST portal (search by product name). Common codes: Computers (8471) → 18%, Food (2106) → 5%, Mobile (8517) → 18%. Use official HSN finder to avoid penalties.
What's the difference between SGST/CGST and IGST in this calculator?
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What's the difference between SGST/CGST and IGST in this calculator?
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If buyer and seller are in same state (intra-state): SGST + CGST (split 50-50). If different states (inter-state): IGST (full amount). Use toggle to select.
Can my customer claim ITC on my invoice?
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Can my customer claim ITC on my invoice?
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Only if: (1) You're GST registered (valid GSTIN), (2) Invoice has correct HSN code, (3) Customer is also GST registered. Without these, ITC cannot be claimed.
What if I invoice the wrong HSN code?
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What if I invoice the wrong HSN code?
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Invoice becomes invalid for ITC purposes. Customer cannot claim credit. Relationship broken. Fix: Issue credit note, re-invoice with correct code.
Do I need to register for GST?
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Do I need to register for GST?
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If turnover >₹20 lakh (₹10 lakh for services), registration is mandatory. Below threshold, optional but recommended for ITC eligibility.
Can I manually override the GST rate in the calculator?
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Can I manually override the GST rate in the calculator?
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Yes, but be careful. Manual rates should only be used for specific exemptions (documented). Default rates are government-mandated.
How do I file GSTR using this invoice?
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How do I file GSTR using this invoice?
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Export invoice as PDF. Report all line items in GSTR-1 with matching HSN codes and amounts. Filing must happen within 11 days of invoice date.
What's the penalty for wrong GST invoicing?
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What's the penalty for wrong GST invoicing?
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₹10,000-₹1 lakh per wrong invoice + 10% of invoice value + prosecution risk. Especially severe for false ITC claims.
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