GST health check: 7 most-missed input tax credits in manufacturing.
Our GST diagnostic.
1. Why ITC goes unclaimed.
Most manufacturers we work with leave 1% to 3% of their annual indirect-tax outflow unclaimed. The reasons are predictable: the accounts team applies a conservative default, no one updates the chart of accounts to capture new categories, and ITC eligibility on borderline items is treated as the 'safe' default-no. A GST health check explicitly hunts for these.
The seven categories below are where we recover the most across our engagements. Each is fact-specific; the entitlement depends on the precise business use and on adherence to the documentation requirements. None of this is an invitation to claim aggressively; it is a checklist for testing what you have already paid GST on and may have not claimed.
2. ITC 1: Canteen and food services.
Section 17(5) of the CGST Act blocks ITC on food and beverages, outdoor catering, beauty treatment, health services, cosmetic and plastic surgery, in general. But the section contains an important exception: where the supply of such goods or services is mandated by any law for the time being in force - for instance, the canteen requirement under the Factories Act, 1948 for factories employing 250 or more workers - the ITC is available.
Many manufacturers in this category pay GST on canteen services to their canteen contractor (or on the food they procure to run the canteen) but do not claim the credit, on the assumption that food expenses are blocked. The exception applies; the credit is available; documentation should establish that the canteen is mandated under the Factories Act and that the workforce threshold is met.
3. ITC 2: Employee transportation.
Section 17(5) also restricts ITC on rent-a-cab and on hire of motor vehicles (except for limited categories). The post-2019 amendments narrowed the restriction: ITC on hiring of motor vehicles with seating capacity exceeding 13 (including driver) is available, regardless of purpose. Many factories use buses or larger vans for employee transportation and the ITC is fully available.
Where the vehicle has seating capacity of 13 or less, ITC is restricted - except where the transportation is mandated by law (e.g. transportation of women employees working night shifts under the relevant state's Shops and Establishments Act). In factories with night shifts, the ITC on the legally-mandated transportation is available.
4. ITC 3: R&D expenses.
R&D-related procurement (instruments, software, consultancy, lab consumables, testing services) is fully GST-creditable where the R&D is used in or in furtherance of the business, even if the R&D ultimately does not lead to a commercial product. The credit is denied only where the R&D results are used personally or for non-business purposes.
Many manufacturers segregate R&D in their books for income-tax weighted-deduction claims (under section 35 of the IT Act, 1961 / corresponding section of the 2025 Act) and apply the income-tax treatment to GST as well, mistakenly excluding ITC on the R&D inputs. The two regimes are independent; GST ITC follows GST law, not the income-tax weighted-deduction rules.
5. ITC 4: Capex incidental costs.
ITC on capital goods is available subject to the proportional restriction under rule 43 where capital goods are used partly for taxable and partly for exempt supplies (or for non-business purposes). The full ITC is available for capital goods used in production of taxable supplies.
The frequently-missed area is incidental costs: installation, erection, commissioning, freight, insurance during transit, foundation work, electrical infrastructure. All of these are GST-creditable when paid for in connection with capex used in taxable-supply production. Many manufacturers capture only the direct equipment-supplier invoice's ITC and miss the installation contractor's ITC, the freight-forwarder's ITC, the insurance ITC, and the electrical contractor's ITC.
6. ITC 5: AMC and maintenance contracts.
Annual Maintenance Contracts (AMCs) on plant and machinery, IT equipment, office equipment, software, and any equipment used in the business are fully GST-creditable. The eligibility is straightforward; the miss is administrative.
AMCs are typically annual-paid or quarterly-paid invoices that arrive at predictable intervals. Where the contract was set up with the vendor pre-GST or where the GST input has not been captured in the standing accounting template, the AMC GST is paid by the company but the ITC is not claimed. A simple AMC vendor-master review identifies the gap.
7. ITC 6: Common service distribution.
An Input Service Distributor (ISD) is a GST registration type that allows distribution of ITC on common input services (like centralised audit, legal, software licences) across multiple GSTIN locations of the same legal entity.
Manufacturers with multiple plants in different states often pay for common input services centrally at the head office GSTIN but do not register as an ISD or do not distribute the ITC. The credit then sits unutilised at the head-office GSTIN (which may not have sufficient outward tax to absorb it) while the plant GSTINs are paying GST on their outward supplies with reduced credit.
Registration as an ISD and a quarterly distribution of common-input ITC across plants is a meaningful administrative improvement that frequently produces a one-time true-up and ongoing benefit.
8. ITC 7: Reverse charge with downstream credit.
Several services attract reverse-charge mechanism (RCM): the recipient is liable to pay GST instead of the supplier. Examples include legal services from advocates, goods transport agency services (subject to opt-out), recovery agent services, services from unregistered suppliers in certain notified cases, import of services.
The RCM amount paid by the recipient is fully creditable in the same period (subject to the eligibility conditions of section 17). Many companies pay the RCM but do not claim the corresponding ITC, either because the RCM is treated as a tax expense rather than an ITC opportunity, or because the system has not been configured to auto-generate the credit entry alongside the RCM payment.
A reconciliation between RCM payments and ITC claimed on RCM in the same return surfaces this gap immediately.
9. The recovery mechanism.
ITC missed in a prior return can be claimed in a subsequent return, subject to the time limit prescribed under section 16(4) - generally up to 30 November of the financial year following the financial year to which the invoice relates, or the date of filing the annual return, whichever is earlier.
The mechanism:
- Identify the missed ITC, invoice by invoice, with the GSTIN of the supplier, the invoice number, date and tax amount.
- Verify the invoice appears in the supplier's GSTR-1 (and therefore in your GSTR-2B); if not, follow up with the supplier for upload.
- Claim the credit in the GSTR-3B of the period in which the discovery is made (subject to the time limit).
- Maintain documentation of the invoice and the eligibility position in case of subsequent inquiry.
A GST health check typically identifies and recovers 1 to 3 per cent of the prior 12-month indirect-tax outflow; a single cycle of the diagnostic usually pays for itself many times over.
Frequently asked
Is ITC on canteen services always available if the Factories Act mandates a canteen?
Where the Factories Act requires a canteen (250 or more workers), the ITC on canteen-related GST is generally available because the supply is mandated by law within the meaning of the proviso to section 17(5). Documentation should establish that the threshold is met and that the canteen is the legally-mandated facility.
Does the Safari Retreats judgment change anything?
The Supreme Court's ruling in Safari Retreats opened up ITC on construction services for immovable property used for renting out as a taxable supply. The implications for ITC on construction of plant and other commercial buildings are still being worked through; the ruling's full scope is the subject of further litigation and clarifications. Our note on Input Tax Credit on Construction Services covers this in detail.
What is the time limit for claiming missed ITC?
Section 16(4) of the CGST Act allows ITC to be claimed up to the earlier of (a) 30 November of the financial year following the financial year to which the invoice relates, or (b) the date of filing the annual return for that year. The time limit is strict.
Does an ISD registration require all GSTINs to be in the same legal entity?
Yes. ISD distributes credit only across GSTINs of the same legal entity (same PAN). For credit distribution across legal entities (e.g. group companies), the cross-charge mechanism with full GST invoicing is the route.
Are reverse-charge GST payments always creditable?
Subject to the general ITC eligibility conditions of section 17 (not blocked credit, used for taxable supply, possession of invoice, etc.). For typical RCM categories (advocates' fees, GTA, import of services for business use), the credit is available.
