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GST Input Tax Credit Tracker

Offset rules: IGST credit → IGST/CGST/SGST output. CGST credit → CGST/IGST output (NOT SGST). SGST credit → SGST/IGST (NOT CGST). Get the order right or you'll over-pay.

Output GST (on your sales)

₹50,000
₹50,000
₹0

Input GST (paid on purchases)

₹20,000
₹20,000
₹40,000
Net GST payable
₹30,000
CGST
₹0
SGST
₹30,000
IGST
₹0

Carry-forward credits: CGST ₹10,000 · SGST ₹0 · IGST ₹0

The CBIC offset order (rule 49A)

From April 2019, GST credit must be utilised in a strict order: IGST credit first against IGST liability, then against CGST, then SGST/UTGST. Only after IGST is exhausted can CGST credit and SGST credit be used — and they can never cross over (CGST cannot offset SGST and vice-versa). Get the sequence wrong and GSTR-3B throws errors or you over-pay in cash.

Worked example

A Bengaluru trader has output liability: IGST ₹50,000, CGST ₹30,000, SGST ₹30,000 (total ₹1.1 lakh). ITC available: IGST ₹40,000, CGST ₹20,000, SGST ₹20,000. Offset: IGST credit ₹40k clears all of IGST liability; remaining IGST output ₹10k is paid in cash. CGST credit ₹20k offsets CGST output ₹30k → ₹10k cash. SGST credit ₹20k offsets SGST output ₹30k → ₹10k cash. Cash outflow ₹30,000 instead of full ₹1.1 lakh.

When to use this

  • Filing monthly/quarterly GSTR-3B and want to verify the auto-populated offset
  • Cross-state business with both IGST and CGST/SGST output
  • Checking impact of unmatched ITC (rule 36(4) — 105% of GSTR-2B cap)
  • Reconciling books vs portal before audit

For composition scheme dealers, see our GST calculator for 1-6% slab arithmetic without ITC.

FAQ

Can I claim ITC on all purchases?

Most B2B purchases yes. Excluded: food/beverages for staff, club / health membership, motor vehicles for personal use, life insurance, works contracts for immovable property (with exceptions).

When can I take ITC?

When all 4 conditions met: (a) invoice received, (b) goods/services received, (c) tax paid by supplier (visible in your GSTR-2B), (d) return filed by supplier. Deadline: 30 Nov of next FY OR annual return filing — whichever earlier.

What if my supplier didn't pay GST?

No (post-2022 rule change). ITC restricted to amounts visible in GSTR-2B. Always verify your suppliers are GSTR-3B compliant.