Input Tax Credit (ITC) in Procurement

Input Tax Credit (ITC) is the GST mechanism that allows a registered taxpayer to reduce their output tax liability by the GST they have already paid on inputs. In government procurement, ITC is relevant both for contractors who pay GST on their input purchases (materials, subcontractor services) and claim credit against the GST they collect on their output contracts, and for government buyers who may have restricted ITC availability on certain procurement.

What is Input Tax Credit in government procurement?

Under the GST framework, every business in a supply chain pays GST on its purchases (input tax) and collects GST on its sales (output tax). ITC allows the output tax liability to be reduced by the input tax paid, preventing the cascading (tax-on-tax) effect of the old VAT and service tax regime.

For government contractors, the ITC chain works as follows:

A construction contractor buys cement, steel, and subcontractor services, paying GST on each purchase. These GST payments accumulate as ITC in the contractor's GST credit ledger. When the contractor bills the government for completed work (at 12 percent GST on works contracts), the contractor's GST liability is reduced by the accumulated ITC. Net GST payable = Output GST on RA Bill - ITC from inputs.

Government buyers' ITC position: Government entities registered under GST can claim ITC on goods and services purchased for business activities. However, government entities engaged in activities that are exempt from GST (such as certain public services) cannot claim ITC on purchases made for those exempt activities. The ITC availability position of the procuring government entity affects how they price procurement, if ITC is not available to them, the GST paid is effectively a final cost.

Blocked credits: Certain inputs have blocked ITC even for registered businesses. Works contract services for immovable property construction (Section 17(5)(c) of the CGST Act) cannot be claimed as ITC by the recipient if used for further supply of works contract services. This restriction affects sub-contracting arrangements in government construction.

Why it matters for bidders

ITC optimization is a cash flow management discipline for government contractors. Claiming all eligible ITC promptly reduces monthly GST outflows and improves working capital. Failing to claim ITC within the time limits (typically the filing deadline for September return of the next financial year) results in permanent loss of that credit.

The ITC chain requires that the supplier, cement company, steel mill, subcontractor, has filed their GST return and paid the tax. ITC is available only when the supplier's GST liability is reflected in GSTR-2B. If a supplier defaults on GST filing, the buyer's ITC is blocked until the supplier files. This makes supplier GST compliance a procurement criterion: working with GST-compliant suppliers protects your ITC claim.

For government buyers, understanding ITC availability on specific procurement categories helps correctly cost the net effective price (inclusive of GST less ITC recovery).

Example

A civil contractor executes Rs 2 crore of government road work in a month. Output GST at 12 percent = Rs 24 lakh. During the same month, the contractor purchased Rs 80 lakh of materials (cement, steel, aggregates) paying 18 percent GST (Rs 14.4 lakh) and Rs 20 lakh of diesel (not eligible for ITC). Eligible ITC = Rs 14.4 lakh. Net GST payable = Rs 24 lakh - Rs 14.4 lakh = Rs 9.6 lakh. The contractor pays Rs 9.6 lakh in net GST for the month instead of the full Rs 24 lakh, reducing cash outflow by Rs 14.4 lakh.

Key rules / thresholds

• ITC must be claimed within the return filing deadline for September of the following financial year (extended deadlines apply periodically).
• ITC is available only if the supplier has filed their GSTR-1 and the credit appears in GSTR-2B.
• Works contract services for own building/civil construction are blocked credits, not claimable as ITC by the recipient.
• RCM supplies: the recipient pays GST directly to the government under RCM; ITC is available on RCM payments (unlike non-RCM blocked credits).
• Proportionate ITC reversal is required when inputs are used for both taxable and exempt supplies.