Chapter 8: Input Tax Credit (ITC)

The Input Tax Credit (ITC) is the backbone of the GST mechanism. It ensures that tax is levied only on the value addition at each stage of the supply chain, thus eliminating the cascading effect of “tax on tax.”

Statutory Basis: Section 16 to 21 of the CGST Act, 2017 and Rules 36 to 45 of the CGST Rules, 2017.

Meaning: ITC means the credit of input tax charged on supply of goods or services used or intended to be used in the course or furtherance of business.

Illustration: If a trader purchases goods for ₹1,00,000 + GST ₹18,000 and sells them for ₹1,50,000 + GST ₹27,000 → Output tax = ₹27,000; ITC = ₹18,000 → Net tax payable = ₹9,000.

Eligibility (Section 16(1)): A registered person is entitled to take credit of input tax if:

He is a registered person under GST.

Goods/services are used for business purposes.

Tax has been charged by a registered supplier.

Possesses a valid tax invoice/debit note.

Has received the goods or services.

Tax has been paid to the Government by the supplier.

Return has been furnished under Section 39 (GSTR-3B).

Under Section 16(2) and related Rules, ITC is allowed only when specific conditions are satisfied.

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A. Basic Conditions

Additional Restriction: Under Rule 36(4), ITC can be availed only to the extent available in GSTR-2B (auto-generated). Manual adjustments are not permitted.

B. Time Limit for Availing ITC

As per Section 16(4), ITC for any invoice/debit note must be availed before the earlier of:

30th November following the end of the financial year, or

Date of filing annual return (GSTR-9).

Example: For FY 2024–25 invoices, ITC can be availed up to 30th November 2025 or before filing GSTR-9 (whichever earlier).

C. Partial Business Use

Where goods/services are partly used for business and partly for personal use → ITC allowed proportionately. (Section 17(1))

Certain ITC is specifically disallowed, even if used for business purposes. These are known as Blocked Credits.

Important Note: Blocked credits reflect the principle of restrictive ITC, ensuring credit is granted only when inputs directly relate to taxable outward supplies.

(a) Reversal of ITC

ITC must be reversed (i.e., added back to output tax liability) in certain circumstances:

(b) Reclaim of ITC

When payment to supplier is made after earlier reversal (e.g., beyond 180 days), ITC can be reclaimed in the month of payment. However, no interest refund is allowed for the period of non-payment.

(c) Calculation of Reversal (Rule 42/43)

Rule 42: For inputs and input services used partly for taxable and exempt supplies.

Rule 43: For capital goods used for both taxable and exempt supplies over 60 months.

Example: If total ITC = ₹1,00,000, and exempt turnover = 20% → proportionate reversal = ₹20,000.

The concept of Input Service Distributor (ISD) allows head offices to distribute input service credits to branches.

Legal Basis: Sections 20 and 21 of the CGST Act, 2017 and Rules 39 and 65.

Who Is an ISD?

An ISD is a registered office (head office) which receives invoices for input services and distributes the ITC to its units (having same PAN) through prescribed documents.

Example: A company’s head office in Delhi receives audit service invoices used by branches in Mumbai and Kolkata. The Delhi HO can distribute ITC proportionately via ISD invoices.

Distribution Mechanism:

ISD receives tax invoice for common input services.

Issues ISD invoice (Rule 54(1)) to each branch.

Distribution based on turnover ratio of each branch in the previous financial year.

CGST & SGST distributed as CGST (if in same State) or IGST (if in different States).

Compliance: ISD must file GSTR-6 monthly, showing details of credits received and distributed.