Section 16 — Your Right to Claim ITC (And How to Lose It)
Input Tax Credit (ITC) is the backbone of GST — it prevents cascading of taxes by allowing you to claim credit of tax paid on inputs against your output tax liability. But Section 16 imposes strict conditions. Miss even one, and your ITC claim is rejected — often resulting in demands running into crores.
The Four Mandatory Conditions — Section 16(2)
ALL four must be satisfied. Failure of even one = ITC denied:
Condition 1 — Possession of tax invoice or debit note: You must have the original tax invoice from the supplier containing their GSTIN, HSN/SAC, tax amount, and your details. A proforma invoice, delivery challan, or quotation is NOT sufficient. Bill of supply (from composition dealer) does NOT entitle ITC.
Condition 2 — Receipt of goods or services: You must have actually received the goods or services. For goods delivered in lots: ITC available on last lot received. For services: deemed received when service is rendered. "Receipt" by agent on behalf of principal counts. Key: if goods are lost/stolen/destroyed before or during transit, ITC is not available (goods not "received").
Condition 3 — Tax actually paid to the government by the supplier: The supplier must have actually deposited the GST with the government. If the supplier collects GST from you but does not deposit it — YOUR ITC is at risk. This condition was the most controversial provision — punishing the buyer for the supplier's default. The Supreme Court is expected to rule on this issue. Practically, the GSTR-2B matching (see below) operationalizes this condition.
Condition 4 — Filing of return: You must have filed your GSTR-3B for the period in which you claim ITC.
Section 16(2)(aa) — GSTR-2B Matching (The Fifth Condition)
Added by Finance Act 2021 (effective January 1, 2022): ITC can be claimed ONLY if the details of the invoice appear in your GSTR-2B (auto-populated from the supplier's GSTR-1). If the supplier has not reported the invoice in their GSTR-1, the invoice will NOT appear in your GSTR-2B, and you CANNOT claim ITC — even if you have the invoice and have received the goods/services.
This effectively makes GSTR-2B the gatekeeper of ITC. Your ITC is now dependent on your supplier's filing compliance. If your supplier files GSTR-1 late, your ITC is delayed. If they never file, your ITC is permanently lost (unless you get them to file through follow-up or legal action).
Section 16(4) — Time Limit for Claiming ITC
ITC for any invoice must be claimed by the EARLIER of:
(a) November 30 following the end of the financial year to which the invoice belongs, OR
(b) The date of filing the annual return (GSTR-9) for that year.
Example: Invoice dated August 15, 2025. You must claim ITC for this invoice in GSTR-3B by November 30, 2026 (or annual return date, whichever is earlier). After that, ITC lapses permanently — no extension, no condonation.
This deadline was earlier "September 30" — extended to "November 30" by Finance Act 2022 to give more time. The practical impact: always reconcile and claim ALL ITC before the November deadline of the following year.
Section 16(3) — 180-Day Payment Rule
If you claim ITC on an invoice but do not PAY the supplier within 180 days from the date of invoice, you must REVERSE the ITC (add it back to your output tax liability). When you eventually pay the supplier, you can re-claim the ITC. Interest at 18% per annum applies for the period the ITC was claimed but payment was not made.
This rule prevents businesses from claiming ITC on purchases they never intend to pay for. Practically: monitor your payable aging — any invoice unpaid beyond 180 days triggers ITC reversal.
Practical ITC Reconciliation Process
Step 1: Download GSTR-2B from the GST portal after the 14th of each month.
Step 2: Match with your purchase register — identify: (a) invoices in 2B but not in books (supplier reported but you missed booking), (b) invoices in books but not in 2B (you booked but supplier did not report).
Step 3: For category (b): follow up with supplier to file/amend their GSTR-1. Do NOT claim ITC on these invoices until they appear in 2B.
Step 4: Claim ITC in GSTR-3B only to the extent of GSTR-2B (plus a small tolerance for rounding/timing differences).
Step 5: Before November 30 each year: final reconciliation for the previous year — claim all pending ITC before the deadline.