GST ITC Calculator
Calculate eligible Input Tax Credit on purchases
Compute eligible Input Tax Credit (ITC) on B2B purchases under CGST/SGST/IGST. Handle ineligible items under Section 17(5), reversal rules, and proportionate credit.
Output GST (collected on sales)
Input GST (paid on purchases)
Claim every rupee of ITC you are owed.
We reconcile 2A/2B, chase non-compliant suppliers, and file recovery applications. Free review.
What is a GST ITC Calculator?
Input Tax Credit is the spine of the GST system — the credit you take for tax already paid on purchases reduces your output tax liability. Get it wrong and you either overpay tax or face a notice with interest at 24% p.a. plus penalty.
The hard part is not the math; it is eligibility. Section 17(5) blocks credit on motor vehicles for personal use, food and beverages, club memberships, works contract for immovable property, and several niche categories. Rule 42 and Rule 43 force a proportionate reversal when inputs are partly used for exempt or non-business supplies.
This calculator walks you through invoices, flags blocked credits, computes Rule 42/43 reversals on common inputs and capital goods, and gives you a final eligible ITC number you can use directly in GSTR-3B Table 4.
Why use this GST ITC Calculator
Built for Indians, by Indians. Every number, every formula, every slab — tuned to FY 2026-27 reality.
Section 17(5) checks
Auto-flags blocked credits — motor vehicles, food, club fees, works contract.
Rule 42/43 reversal
Proportionate reversal for exempt vs taxable supplies on inputs and capital goods.
GSTR-3B aligned
Output mirrors Table 4(A) eligible ITC and Table 4(B) reversal columns.
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Invoice data never leaves your device.
Using the GST ITC Calculator in 4 steps
No onboarding, no signup. Answer three fields and the numbers update live.
Enter purchase tax
Add CGST, SGST, and IGST paid on each invoice for the tax period.
Mark ineligible items
Tick Section 17(5) categories — calculator removes the credit automatically.
Add exempt turnover
For Rule 42/43 reversal, enter exempt and total turnover for the period.
Read eligible ITC
Use the final eligible ITC figure in GSTR-3B Table 4. Save the working as audit trail.
Tips to get the most out of it
Reconcile ITC with GSTR-2B every month before filing 3B. Claim only what your supplier has uploaded — Rule 36(4) restricts credit to 2B-matched invoices.
For mixed-use inputs (telecom, rent, banking) on exempt + taxable supplies, run Rule 42 every month — reverse the proportionate share before claiming.
For capital goods used for exempt supplies, Rule 43 spreads reversal over 60 months. Maintain a register; one-shot reversal is wrong and gets noticed in audit.
Block-credit items (Section 17(5)) are non-negotiable — even if vendor charged GST, you cannot claim. Common trap: gym memberships, business-class flights for non-employees, motor cars for staff.
Time-limit: ITC for an FY can be claimed up to 30 November of the next FY or annual return filing, whichever earlier. Missed credits expire — sweep your books quarterly.
Real-world scenarios
How Indians actually use this calculator — concrete inputs, concrete outcomes.
Trader with mixed supplies
Total ITC ₹4 L. ₹50K is on a motor car (blocked u/s 17(5)) → drop. Exempt turnover 20% of total → reverse 20% of common inputs (₹30K). Eligible ITC = ₹3.2 L.
SaaS company
Cloud, software, and rent ITC ₹2.5 L. No exempt supplies → no Rule 42 reversal. ₹15K club membership for founder = blocked. Eligible ITC = ₹2.35 L.
Manufacturer with capital goods
Plant & machinery ITC ₹12 L. 10% of output is exempt → Rule 43 reversal of ₹1.2 L spread across 60 months = ₹2,000/month reversal. Net first-month ITC = ₹11.98 L.
Frequently Asked Questions
Still have a question? Our team replies within a business day.
Common blocked items: motor vehicles (except for transport business / driving schools / further supply), food & beverages, outdoor catering, beauty treatment, health services, club memberships, works contract for immovable property (other than plant and machinery), goods lost/stolen/destroyed.
Rule 42 covers inputs and input services partly used for exempt or non-business supply — proportionate reversal monthly. Rule 43 covers capital goods used partly for exempt — reversal spread over 60 months (5 years).
Yes. From 1-Jan-2022 (Section 16(2)(aa) + Rule 36(4)), ITC is allowed only if the supplier has uploaded the invoice and it appears in your GSTR-2B for the period.
Yes — pay the RCM tax in cash via GSTR-3B Table 3.1(d), then claim it as ITC in Table 4(A)(3) of the same or any subsequent month, subject to eligibility.
Wrongly availed ITC must be reversed with interest @ 24% p.a. (when utilised) plus penalty up to 100% under Section 74 if there is fraud / wilful suppression. Voluntary reversal before notice limits penalty to 15%.
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