What Is Input Tax Credit in GST? Meaning and Example

Input tax credit (ITC) is the GST a business pays on its purchases, which it can deduct from the GST it collects on its sales. It is the reason GST is a tax on value added rather than on every sale in the chain, and it is the single largest number most businesses manage in their GST returns. This guide explains what input tax credit is in plain terms, works through an example, and sets out the conditions and exclusions that decide whether a particular credit is actually yours.

Input tax credit: the meaning

Section 2(62) of the CGST Act defines input tax as the GST — central, state, integrated or union territory tax — charged on goods and services supplied to a registered person, including tax paid under reverse charge and IGST on imports. Section 2(63) defines input tax credit simply as the credit of that input tax. Put plainly: the tax you paid going in can be set against the tax you owe going out.

It applies to anything used in the course or furtherance of business — raw materials, stock for resale, office rent, software subscriptions, professional fees, machinery — subject to the exclusions below.

A worked example

A trader buys goods for ₹1,00,000 and sells them for ₹1,50,000. Assume, for the example, an 18% rate on both.

The ₹9,000 is 18% of ₹50,000 — the value the trader added. Without ITC the trader would pay ₹27,000, and the ₹18,000 already paid on the purchase would become a cost baked into the price. The arithmetic behind GST amounts is in how to calculate GST.

Why it exists: tax on value added

Follow a product from manufacturer to wholesaler to retailer to consumer. At each step the seller charges GST on the full price, and at each step the buyer claims credit for the GST it paid. Each business ends up paying tax only on its own margin, and the total collected by the government equals the tax on the final price paid by the consumer, who cannot claim credit. Before GST, taxes at different stages could not always be offset against each other, so tax was charged on tax. ITC is what removes that cascade.

The four conditions for claiming it

Section 16(2) sets the conditions. All four must be met:

1. You hold a tax invoice or debit note issued to your GSTIN. See GST invoice format.
2. You have received the goods or services. Goods delivered to a third party on your instructions count.
3. The supplier has reported the invoice and paid the tax. In practice, the invoice must appear in your GSTR-2B. See GSTR-2A vs GSTR-2B.
4. You have filed your own return, GSTR-3B, for the period.

Two time rules sit alongside. You must pay the supplier within 180 days of the invoice date, or reverse the credit until you do — see the 180-day rule. And the credit must be claimed within the deadline in Section 16(4) — see the ITC time limit.

Credit you cannot claim

Section 17(5) blocks credit on certain purchases even when they are used in business. The main ones: most motor vehicles and their insurance and repair, food and beverages, outdoor catering, beauty treatment, health services, club memberships, travel benefits for employees on leave, works contracts and construction of immovable property (other than plant and machinery), goods lost, stolen or given as free samples, and tax paid under composition. Each has exceptions; the full list is in blocked credits under Section 17(5). Where purchases are used partly for exempt supplies, credit is apportioned under Rules 42 and 43.

How credit is used against tax

Credit sits in the electronic credit ledger under IGST, CGST and SGST and is used against the tax liability in GSTR-3B in a fixed order. IGST credit is used first, against IGST and then CGST or SGST. CGST credit can never be used against SGST, or the other way round. What cannot be covered by credit is paid in cash. The order is explained in electronic credit and cash ledgers, and the differences between the heads in CGST, SGST and IGST.

Who cannot claim input tax credit

• Unregistered persons — only a GSTIN can hold credit.
• Composition taxpayers — see the composition scheme.
• Consumers — the end of the chain, who bear the tax.
• Suppliers of exempt goods or services, to the extent of the exempt supplies.

Protecting your credit

Condition three is the one you do not control. If a supplier's registration is cancelled, or it does not file, the invoice may not reach your GSTR-2B, or the credit can be questioned later. Businesses that rely on ITC therefore check suppliers at onboarding and before payment: is the GSTIN active, does the legal name match the invoice, and is the supplier filing its returns? See checking a supplier's filing status, and when it goes wrong, ITC when a supplier's GST is cancelled retrospectively. The fuller treatment of the rules is in input tax credit rules explained.

Frequently asked questions