Concept and Working
Input Tax Credit (ITC) is the mechanism under GST that allows a registered taxpayer to claim credit for eligible GST paid on inputs, input services and capital goods used in the course or furtherance of business and utilise that credit against output GST liability.
It ensures that GST effectively falls on value addition rather than the entire value of a product at every stage.
For example, if a manufacturer incurs ₹100 GST on business inputs and has an output GST liability of ₹150, eligible ITC allows ₹100 to be set off and only ₹50 to be paid as the remaining liability, subject to GST law.
ITC is therefore central to GST because it:
- prevents tax-on-tax or cascading;
- creates an invoice-based credit chain;
- reduces embedded taxation in production;
- encourages suppliers and buyers to remain within the formal tax system;
- supports GST’s character as a destination-based value-added tax.
Eligibility, Conditions and Restrictions
The principal framework is contained in Sections 16–18 of the CGST Act, 2017.
Under Section 16, ITC is subject to statutory conditions, including broadly:
- possession of a valid tax invoice/debit note or prescribed document;
- relevant invoice details being furnished by the supplier and communicated to the recipient under the GST framework;
- receipt of the goods or services;
- tax relating to the supply having been actually paid to the Government, subject to the statutory mechanism;
- furnishing of the prescribed GST return.
The law also prescribes a time limit for claiming ITC: generally up to 30 November following the end of the relevant financial year or the date of filing the relevant annual return, whichever is earlier.
ITC is not universally available. Section 17(5) specifies blocked credits, including, subject to statutory exceptions:
- certain motor vehicles and related expenditure;
- food and beverages and specified personal-consumption services;
- club, health and fitness membership;
- works-contract services for construction of immovable property;
- goods/services used for construction of immovable property on one’s own account;
- goods or services used for personal consumption;
- goods lost, stolen, destroyed, written off or disposed of as gifts/free samples.
Where inputs are used partly for taxable business supplies and partly for exempt or non-business purposes, credit is correspondingly restricted or apportioned.
Significance and Issues
ITC creates a self-reinforcing compliance architecture because a purchaser’s ability to obtain credit is linked to documentation and tax compliance across the supply chain. This produces an invoice trail, improving transparency and helping tax authorities detect:
- fake invoices;
- circular trading;
- shell entities;
- fraudulent ITC claims.
At the same time, ITC has become one of the most litigated areas of GST because legitimate recipients may face credit difficulties arising from supplier non-compliance, invoice mismatches and procedural requirements.
The utilisation of credit also follows statutory rules across IGST, CGST and SGST/UTGST credit ledgers, enabling the integrated GST mechanism to transfer tax credits across State borders while preserving revenue settlement between governments.
ITC is therefore the operational backbone of GST: without a seamless credit chain, GST would cease to function effectively as a value-added tax and cascading taxation would re-emerge.
