GST Input Tax Credit Rules — Sections 16–21, Rule 36–44 Complete Guide

Updated: 3 June 2026 | CGST Act, 2017 | CGST Rules 2017 — Rules 36 to 44

Input Tax Credit (ITC) under GST allows registered businesses to offset GST paid on purchases against GST collected on sales. The four basic conditions under Section 16(2): (1) valid GST invoice/debit note, (2) goods/services received, (3) supplier has paid tax to government, (4) you have filed GSTR-3B. ITC must appear in auto-populated GSTR-2B before it can be safely claimed. Section 17(5) lists blocked credits — ITC that can never be claimed regardless of business use.

GSTR-2B

Auto-populated ITC statement — claim only what reflects in GSTR-2B
Claiming ITC not in GSTR-2B triggers demand notices under Section 73/74. Reconcile monthly before filing GSTR-3B.

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ITC time limit — 30 November of the following financial year. ITC for FY 2025-26 must be claimed by 30 November 2026 or the date of filing annual return (GSTR-9), whichever is earlier. Missed ITC cannot be recovered after this deadline — it lapse permanently.

Section 16(2) — Four Conditions for ITC Eligibility

All four conditions must be satisfied simultaneously. Failure of even one condition disqualifies ITC:

#	Condition	Practical Implication	Status
1	Valid tax invoice / debit note from supplier	Invoice must have all mandatory fields under Section 31 — GSTIN, HSN, tax amount, date	Must satisfy
2	Goods or services actually received	Delivery must be completed; ITC available even for goods in transit if invoice raised	Must satisfy
3	Tax actually paid by supplier to government	Supplier must have filed GSTR-1 and GSTR-3B and paid the tax. Invoice must appear in GSTR-2B	Must satisfy
4	Buyer has filed GSTR-3B return	ITC can only be availed in a return period for which GSTR-3B has been filed	Must satisfy

Section 17(5) — Blocked Credits (ITC NOT Allowed)

These are expenses where ITC is permanently blocked by law — even if used exclusively for business. Claiming blocked credit is a common audit trigger.

ITC Scenario	Eligible / Blocked	Section	Notes
Motor vehicles (cars, SUVs) — general use	BLOCKED	17(5)(a)	Allowed only for dealers, taxi operators, driving schools
Trucks, buses, vessels for goods transport	ELIGIBLE	17(5)(a) proviso	Commercial transport of goods — ITC allowed
Food and beverages, outdoor catering	BLOCKED	17(5)(b)(i)	Includes employee meals, canteen; exception if mandatory under law
Rent-a-cab service for employees	BLOCKED	17(5)(b)(ii)	Allowed if mandatory under law or if you supply rent-a-cab service
Life/health insurance for employees	BLOCKED	17(5)(b)(iii)(iv)	Allowed if legally obligatory or if you are an insurance company
Club membership, health & fitness	BLOCKED	17(5)(b)(v)	No exception
Works contract for immovable property	BLOCKED	17(5)(c)	Exception: works contract used for further supply of works contract service
Construction of own building / office	BLOCKED	17(5)(d)	Civil construction, extension, renovation of any immovable property owned
Goods/services for personal consumption	BLOCKED	17(5)(g)	Any goods/services not used in business — personal laptops, personal travel, etc.
Computers, office furniture, ACs for business	ELIGIBLE	Section 16	Movable assets used for business — full ITC allowed

Rule 86B — Mandatory 1% Cash Payment

Applicable to registered persons with aggregate turnover above ₹50 lakh in any financial year. If your ITC balance exceeds 99% of the total output tax liability in a month, you must pay at least 1% of output tax liability in cash (not through ITC). This rule targets businesses that rely entirely on ITC to discharge output tax without ever making cash payments — a pattern associated with bogus ITC fraud.

EXEMPTION

Who is Exempt from Rule 86B?

Exemptions apply if: (1) you or your proprietor/karta/managing director/partner has paid income tax above ₹1 lakh in either of the two preceding financial years; (2) you have received a GST refund of more than ₹1 lakh in the preceding financial year; (3) you have discharged output tax liability in cash of more than 1% cumulatively in the financial year; (4) you are a government entity, PSU, local authority, or statutory body.

Rule 42 — Proportionate ITC Reversal for Mixed Supplies

If your business makes both taxable supplies (eligible for ITC) and exempt supplies (not eligible for ITC), you cannot claim full ITC. Rule 42 requires you to calculate and reverse ITC proportionately:

Formula: ITC to reverse = Total common ITC × (Exempt turnover ÷ Total turnover). This calculation must be done provisionally every month and finalised in GSTR-9 (annual return). Interest at 18% applies on excess ITC not reversed.

RULE 43

Rule 43 — ITC on Capital Goods Used for Both Taxable and Exempt Supplies

Capital goods (machinery, equipment) used for making both taxable and exempt supplies must have ITC reversed proportionately over 5 years (60 months). The reversal is calculated monthly and included in GSTR-3B. Rule 43 applies only to capital goods — not services or consumables (which are covered by Rule 42).

Frequently Asked Questions

Can I claim ITC on a car purchased for business use?

Generally no. Motor vehicles (including cars) are blocked under Section 17(5)(a) of CGST Act unless the vehicle is used for specific purposes: (1) further supply of the vehicle itself (car dealers), (2) transportation of passengers as a business (taxi operators, tour operators), or (3) imparting driving training. For all other businesses, ITC on car purchase and related expenses (insurance, maintenance, repair) is blocked regardless of whether the car is used for business. Commercial vehicles like trucks, buses, and tempo travellers used for goods transport are eligible.

Can I claim ITC on office renovation or construction?

ITC on construction of immovable property is blocked under Section 17(5)(c) and (d) — including civil construction, fabrication, and erection of immovable property, even if used for business. However, ITC on movable assets inside the office (furniture, air conditioners, computers, electrical fixtures, lifts) is allowed if used for business. Repair and maintenance of existing premises (painting, plumbing) is also eligible if the vendor charges GST and files their returns. The key test is whether the expense creates a new immovable structure.

Is ITC allowed on food and beverages provided to employees?

No. ITC on food and beverages, outdoor catering, and club membership is blocked under Section 17(5)(b) of CGST Act. This includes canteen services, meal coupons, and restaurant bills for employees. Exception: if providing food or catering is your core business (e.g., you run a catering company or restaurant), ITC is available on your inputs for that business. Also, if an employer is legally obligated under any law to provide canteen services (like Factories Act), ITC on that mandatory canteen may be partially eligible per recent court rulings — consult a CA.

What do I do if my GSTR-2B shows less ITC than what my supplier invoiced?

A GSTR-2B mismatch means your supplier has not filed their GSTR-1 or has made an error. Steps: (1) Contact the supplier and request GSTR-1 filing immediately; (2) Do not claim ITC in GSTR-3B for the mismatched invoices until they appear in GSTR-2B — claiming without GSTR-2B reflection risks a demand notice under Section 73/74; (3) If the supplier is unresponsive, consider recouping the ITC amount from the supplier; (4) Mismatches older than the time limit (30 November of the following year) result in permanent ITC loss. Proactive GSTR-2B reconciliation every month prevents these issues.

What interest applies if I reverse wrongly claimed ITC?

If you voluntarily reverse ITC that was wrongly claimed (e.g., blocked credit claimed by mistake, or claimed on invoices not appearing in GSTR-2B), you must pay interest at 18% per annum from the date of wrongful availment to the date of reversal. However, if you reverse ITC that was availed but never utilised (i.e., the ITC balance was never used to offset output tax), the Supreme Court in Union of India v Bharti Airtel (2021) and subsequent guidance suggests that interest may not apply on unutilised ITC reversals. Still, the department often demands 18% — consult a CA before making large reversals.

Input Tax Credit Guide GST Demand Notice GST Return Filing GST Annual Return (GSTR-9) GST Registration GST ITC Rules Overview

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