Complete Guide to Input Tax Credit (ITC) in India
What is Input Tax Credit?
Input Tax Credit (ITC) is the mechanism that makes GST a "value-added" tax rather than a cascading one. When a registered business pays GST on its purchases (inputs), it can claim that amount as credit against the GST it collects on its own sales (output), paying only the net difference to the government. Without ITC, tax would compound at every stage of the supply chain. Estimate your own net position with the ITC Estimator.
Conditions to claim ITC
Four conditions must be satisfied simultaneously under Section 16 of the CGST Act: you must hold a valid tax invoice or debit note, you must have actually received the goods or services, your supplier must have filed their GSTR-1/GSTR-3B and actually paid the tax to the government, and you must file your own return claiming the credit within the prescribed time limit (generally by the earlier of the November 30 following the financial year, or the date of filing the annual return).
What is GSTR-2B and why it matters
GSTR-2B is an auto-generated, static monthly statement showing ITC available to you based on your suppliers' filings. Since 2021, ITC claims in GSTR-3B are effectively restricted to what appears in GSTR-2B, making monthly reconciliation between your purchase register and GSTR-2B a mandatory compliance step, not an optional best practice.
Blocked credits under Section 17(5)
Certain categories of ITC are permanently blocked regardless of business use, including: motor vehicles for personal transport of persons (with limited exceptions for further supply, transport services, or driving schools), food and beverages, outdoor catering, health and life insurance (with some exceptions), club memberships, works contract services for construction of immovable property (except plant and machinery), and goods/services used for personal consumption.
ITC utilisation order
Available credit must be used in a specific priority order: IGST credit is used first against IGST liability, then CGST, then SGST. CGST credit is used against CGST liability, then IGST (never SGST). SGST credit is used against SGST liability, then IGST (never CGST). This ordering keeps Centre-State revenue distribution balanced even as credit flows across components.
Reversal of ITC
ITC must be reversed (paid back) in specific situations: if payment to the supplier is not made within 180 days of the invoice date, if inputs are used partly for exempt supplies (proportionate reversal under Rule 42/43), or if goods are lost, stolen, destroyed, or given as free samples/gifts.
What happens to unused ITC?
Unused ITC carries forward indefinitely to future tax periods as a credit balance in your electronic credit ledger. In specific situations — zero-rated exports, or an inverted duty structure where input tax exceeds output tax — unused ITC can be claimed as a cash refund via Form RFD-01. Compare export routes with the Export GST Calculator.
Practical checklist
- Reconcile GSTR-2B against your purchase register every month before filing GSTR-3B.
- Follow up with suppliers who haven't filed, since unfiled supplier returns block your credit.
- Pay suppliers within 180 days to avoid mandatory ITC reversal.
- Track blocked-credit categories separately in your books to avoid incorrect claims.
- File annual reconciliation carefully — mismatches surface prominently in GSTR-9/9C.