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What ITC in GST Is
Input Tax Credit is the mechanism within India’s Goods and Services Tax system that prevents cascading taxation. When a GST-registered business purchases goods or services from another registered supplier, it pays GST on that purchase. ITC allows the buyer to credit that tax paid against its own GST liability on outward sales, so that only the net value-add at each stage of the supply chain bears tax.
In practice: a manufacturer paying 18% GST on raw materials does not pay 18% again on the full sale price of finished goods. It offsets the input tax against output tax, remitting only the incremental GST generated at its stage of production. This mechanism is foundational to how GST eliminates tax-on-tax accumulation across multi-tier supply chains.
Since January 2022, Rule 36(4) restricts ITC claims to amounts that appear in the buyer’s GSTR-2B auto-populated statement — which is generated from suppliers’ GSTR-1 filings. This made ITC reconciliation against GSTR-2B a legal obligation, not a discretionary control.
How ITC Works
The Basic Mechanics
A business purchases inputs and pays 18% GST on the invoice value. That GST amount is recorded as ITC in the buyer’s GST ledger. When the buyer sells its product or service and collects 18% GST from its customer, the output tax liability is first offset against the accumulated ITC balance. Only the remaining liability — output tax minus ITC — is remitted to the government. If ITC exceeds output tax in a period, the excess can be carried forward to the next period or, for exporters, refunded.
GSTR-2B and the Matching Requirement
GSTR-2B is a monthly statement auto-generated by GSTN from all suppliers’ GSTR-1 filings. It shows, at invoice level, which inward supplies are eligible for ITC in the current period. A buyer’s accounts payable team must reconcile its purchase register against GSTR-2B each month: invoices in the purchase register but absent from GSTR-2B represent potential ITC that cannot yet be claimed; invoices in GSTR-2B but absent from the purchase register need internal verification before claiming.
Reversal Triggers
ITC must be reversed in three main scenarios: (1) payment not made to supplier within 180 days of invoice date — ITC previously claimed is reversed and becomes a liability with interest; (2) goods or services used for exempt supply — proportionate reversal under Rule 42; (3) capital goods used partly for exempt purposes — annual reversal under Rule 43.
ITC Eligibility Scenarios
| Scenario | ITC Eligible? | Condition or Note |
|---|---|---|
| Standard B2B purchase (taxable supply) | Yes | Invoice must appear in GSTR-2B; payment within 180 days |
| Personal vehicle purchase | No | Blocked under Section 17(5) regardless of use |
| Business vehicle (goods transport) | Yes | Specific carve-out for goods transport vehicles |
| Employee meals / canteen (contractual obligation) | Yes (since 2021 amendment) | Must be a statutory or contractual obligation to employees |
| Capital goods (manufacturing machinery) | Yes | Proportionate reversal required if partly used for exempt supply |
India-Specific Compliance: Rule 36(4) and the January 2022 Change
Before January 2022, taxpayers could claim ITC provisionally — up to 5% beyond what appeared in GSTR-2B — pending supplier filing. Rule 36(4) was progressively tightened and from January 2022, ITC is restricted to 100% of GSTR-2B amounts. No provisional claim is permitted.
This single regulatory change converted GSTR-2B reconciliation from a recommended accounting practice into a statutory compliance requirement with direct financial consequences. Organisations that had been manually reconciling GSTR-2B on a quarterly basis — acceptable under the earlier provisional-claim regime — found that the new rule imposed a monthly reconciliation discipline. For large buyers with 200 to 500 active suppliers, each filing monthly GSTR-1 invoices, monthly reconciliation at invoice level requires automation to be completed within the 20-day window between GSTR-2B generation and GSTR-3B filing.
ITC management sits at the intersection of accounts payable operations and GST compliance. Organisations managing high supplier volumes benefit from purpose-built GST reconciliation software that automates GSTR-2B matching; the broader reconciliation infrastructure requirements are covered in the guide to reconciliation software India.