Why ITC exists — a 30-second refresher
When a Surat wholesaler buys fabric worth ₹1,00,000 + ₹5,000 GST and sells garments for ₹1,50,000 + ₹7,500 GST, the government should net ₹2,500 from him — tax on the value he added. Input tax credit is the mechanism: he owes ₹7,500 on sales, claims ₹5,000 credit for tax already paid on purchases, and pays ₹2,500 in cash. Break the credit chain anywhere and tax starts taxing tax. The full concept is covered in our input tax credit tutorial.
The section 16 conditions: all of them, every time
To claim credit on a purchase, every condition below must be met — they are cumulative, not alternatives:
- You hold a valid tax invoice (or debit note / prescribed document) with your correct GSTIN on it.
- You actually received the goods or services. Paper transactions with no delivery are the classic fake-ITC fraud pattern the department hunts for.
- The supplier has reported the invoice — it must appear in your GSTR-2B, and the supplier must have furnished it via GSTR-1.
- The tax has actually been paid to the government by the supplier.
- You file your GSTR-3B claiming the credit.
- The purchase is for business and used for taxable (including zero-rated) supplies — credit attributable to exempt supplies or personal use must be reversed proportionately.
Two follow-up rules with real teeth:
- The 180-day payment rule: if you don't pay your supplier within 180 days of the invoice, the ITC you claimed must be reversed with interest — and can be re-claimed once you pay. Slow-paying businesses trip on this constantly.
- The time limit: credit for a financial year must be claimed by the prescribed cut-off (linked to the 30 November of the following year / annual return, whichever is earlier, under the long-standing framework). Miss it and the credit is gone forever.
Blocked credits — the section 17(5) list in plain language
Some purchases carry GST you can never claim, no matter how business-related they feel. The recurring categories (concept-level — check the current text for fine print):
| Blocked category | Typical trap | Common exception |
|---|---|---|
| Motor vehicles for passenger transport (up to 13 seats) | GST on the director's new car — ₹90,000 on a ₹5 lakh tax bill, not claimable | Dealers in vehicles, transport/driving-school businesses |
| Food, beverages, outdoor catering | Office party catering bill | Where providing it is your outward supply, or it is statutorily obligatory for employees |
| Club memberships, health & fitness centres | Gym membership "for staff welfare" | Rarely any |
| Works contract / construction of immovable property (on own account) | GST on building your own office premises | Plant and machinery; construction businesses supplying onward |
| Personal consumption | Household items billed to the firm | None |
| Goods lost, stolen, destroyed, or given as free samples/gifts | Diwali gift hampers to customers | None — reversal required |
| Tax paid due to fraud/detention demands | Penalty-linked tax in a demand order | None |
Example: A trading firm claims ₹38,000 ITC in a year that includes ₹9,000 on a staff-outing hotel package and ₹6,500 on festival gifts. Both are blocked. Found in audit two years later, the firm repays ₹15,500 plus roughly 18% p.a. interest — the ₹15,500 "saving" becomes about ₹21,000 of outflow.
GSTR-2B: the gatekeeper of every claim
Since ITC became restricted to invoices appearing in GSTR-2B (the static monthly statement generated from your suppliers' filings), your credit is only partly under your control — the rest depends on supplier behaviour. The monthly discipline:
- Download 2B every month after it is generated (mid-month, based on suppliers' GSTR-1 filings).
- Match it against your purchase register three ways: in books and in 2B (claim); in books but not in 2B (chase the supplier — do not claim yet); in 2B but not in books (check for missed entries or wrong-GSTIN billing).
- Follow up missing invoices before the supplier's next filing window — a reminder on the 8th of the month gets your invoice into their GSTR-1 by the 11th.
- Track carried-forward items so credits deferred to later months are not forgotten past the time limit.
Our guides on GSTR-2B reconciliation and the hands-on 2B reconciliation walkthrough in iAccounting show this workflow step by step, and the reconciled figure then flows into your GSTR-3B.
Habits of businesses that never lose ITC
- Vendor hygiene beats recovery. Before onboarding a supplier, check their GSTIN status and filing track record on the portal — a non-filing vendor is a discount trap: 2% cheaper, 18% costlier.
- Give every vendor your GSTIN in writing and reject invoices with errors on the spot; a wrong GSTIN means the credit lands in someone else's 2B.
- Pay suppliers within 180 days, or diarise the reversal and re-claim.
- Tag blocked-credit expense heads in your books (vehicles, food, gifts, construction) so ineligible GST is expensed automatically, never claimed by habit.
- Reconcile monthly, not at year-end. March-time mega-reconciliations lose credits to the time limit and make GSTR-9 a nightmare.
The one-line summary: an ITC claim survives when the invoice is genuine, the goods moved, the supplier filed and paid, the invoice sits in your 2B, you paid the supplier within 180 days, and the expense is not on the blocked list. Build a monthly routine around that sentence and your working capital stays yours.