Slag Steel Mill Cement Blending PSC Inter-Industry Supply Reconciliation

A Tier-2 Indian cement producer operating a Portland Slag Cement (PSC) line at a coastal Andhra Pradesh plant sits at the receiving end of an inter-industry supply chain — Granulated Blast Furnace Slag (GBFS) sourced from integrated steel producers, blended with Portland cement clinker and gypsum at 25 to 70 percent slag content per IS 455 issued by the Bureau of Indian Standards, and sold as PSC under the OPC-plus-blended-cement portfolio to end-use construction and infrastructure customers. The regulatory and reconciliation overlay on this cross-industry supply stack — HSN Chapter 2618 classification and IGST at 18 percent under the Central Board of Indirect Taxes and Customs rate schedule, Section 194Q of the Income-tax Act 1961 buyer-side TDS at 0.1 percent above the Rs 50 lakh single-seller aggregate threshold (including Government-company sellers such as SAIL per CBDT Circular 20/2021 Paragraph 4.5), Rule 138 of the CGST Rules 2017 e-way bill mandate for every consignment above Rs 50,000, Ind AS 2 landed-cost inventory valuation and the batch-level IS 455 slag-ratio compliance test — is the subject of this slag steel mill cement blending PSC inter-industry supply walkthrough.

Quick reference

The reconciliation in one paragraph

A cement producer running a PSC line procures GBFS across multiple integrated steel producers under a cross-industry supply arrangement, and the reconciliation surface must hold the per-source, per-consignment, per-batch and per-seller detail simultaneously. The source-wise slag procurement register captures every dated GBFS consignment with the steel producer identity (SAIL Vishakhapatnam Steel Plant, JSW Vijayanagar, Tata Steel Jamshedpur, JSPL Angul and other integrated steel producers within the freight-economic radius), the mill-gate rate per tonne, the tax invoice under HSN 2618 with 18 percent IGST or intra-state CGST plus SGST, the freight rate per tonne-kilometre and the total distance, the inbound weighbridge tonnage (gross weight minus tare weight, adjusted for moisture per the moisture test at unloading), the Rule 138 e-way bill number and the transporter vehicle number. The per-seller Section 194Q aggregate monitor rolls up the financial-year-to-date purchase total against the Rs 50 lakh threshold (GST-inclusive per Circular 20/2021 Paragraph 4.9) and triggers the 0.1 percent TDS deduction at the time of credit or payment whichever is earlier on the incremental purchase amount exceeding the threshold — including for SAIL which despite being a Government company is NOT exempt from Section 194Q per Paragraph 4.5 of the same circular. The PSC batch production register captures the input tonnage of clinker plus gypsum plus GBFS plus additives per batch, computes the slag percentage and verifies compliance against the IS 455 25 to 70 percent window; non-conforming batches are flagged for re-blend or re-classification. The Ind AS 2 landed cost per tonne of received GBFS loads material plus freight plus any non-refundable component into the inventory valuation, excluding the 18 percent IGST which is fully recoverable under Section 16 of the CGST Act 2017. The month-end packet cross-links the Section 194Q TDS deducted to Form 3CD Clause 34(a) tax audit disclosure and the 18 percent IGST charged by the steel producer to GSTR-2B input tax credit reconciliation.

What the scenario looks like in India — a coastal Andhra Pradesh PSC plant persona

The illustrative persona for this walkthrough is a Tier-2 Indian cement producer operating a Portland Slag Cement line at a coastal Andhra Pradesh plant with 4 million tonnes per annum PSC production capacity. The plant is positioned to draw GBFS from three primary sources within the freight-economic road-plus-rail radius — the Steel Authority of India Limited (SAIL) Vishakhapatnam Steel Plant approximately 180 kilometres away, the JSW Steel Vijayanagar integrated works approximately 330 kilometres away by combined rail-plus-road, and a third-party integrated steel producer (JSPL Angul or similar) at approximately 720 kilometres by rail. The 720-kilometre source is at the outer edge of the freight-economic envelope and typically operates as a swing source rather than a base-load source — invoked only when the primary two sources are supply-constrained or when a rail-freight incentive brings the landed cost into the competitive range against the primary sources.

Illustrative Indian cement producers operating PSC lines at coastal Andhra Pradesh, coastal Karnataka, Chhattisgarh-Odisha and North-East integrated cement complexes with GBFS procurement from adjacent integrated steel producers include UltraTech Cement (Aditya Birla Group, PSC across multiple plants), Ambuja Cements (Adani Group, PSC across coastal and inland plants), ACC Ltd (Adani Group, PSC across multiple plants), Dalmia Bharat Cement (PSC and composite cement across South and East India plants), Ramco Cements (PSC and OPC across Tamil Nadu and Andhra Pradesh plants), JK Cement (PSC and OPC), Shree Cement (PPC and OPC dominant with limited PSC), Birla Corporation, HeidelbergCement India, JK Lakshmi Cement, Prism Johnson, Nuvoco Vistas, Star Cement (Meghalaya-anchored composite cement), Orient Cement and India Cements. Every one of these producers with a PSC line runs some variant of the source-wise GBFS procurement register, the Section 194Q per-seller aggregate monitor and the IS 455 batch-level compliance test documented here, and the reconciliation discipline is the standing monthly close mechanic for the PSC cost-of-production accounting and the tax-audit disclosure.

The regulatory overlay — IS 455 blending window, HSN 2618 IGST, Section 194Q, Rule 138 and Ind AS 2

Five regulatory anchors govern the slag-steel-mill-to-cement-plant inter-industry supply reconciliation. IS 455:2015 issued by the Bureau of Indian Standards is the product-standard anchor for Portland Slag Cement — Clause 4.1 permits GBFS content between 25 percent and 70 percent by mass, Clause 8 mandates sampling every 500 tonnes of production for physical testing at a BIS-approved or NABL-accredited laboratory, and Clause 12 mandates bag or bulk consignment marking. Any PSC batch outside the 25 to 70 percent window is non-conforming and must be re-blended into the window, re-classified to a different cement type whose specification the actual composition fits, or scrapped depending on the deviation size and the plant quality lead’s determination.

HSN Chapter 2618 in the First Schedule to the Customs Tariff Act 1975 covers ‘granulated slag (slag sand) from the manufacture of iron or steel’ and is the GST classification anchor for GBFS. The IGST rate for inter-state supply is 18 percent per Notification 1/2017-Central Tax (Rate) dated 28 June 2017, Schedule III, Serial 25 (rate schedules are periodically rationalised — cross-verify the current rate at the time of transaction). For intra-state supply the split is CGST 9 percent plus SGST 9 percent totalling 18 percent. Rule 46 of the CGST Rules 2017 governs the tax invoice content requirements including HSN code, description, quantity, unit and rate of tax. The 18 percent IGST or CGST-plus-SGST is fully creditable to the receiving cement producer as input tax credit under Section 16 of the CGST Act 2017 subject to the standard conditions.

Section 194Q of the Income-tax Act 1961 (inserted by Finance Act 2021) requires a buyer whose total sales, gross receipts or turnover from the business exceeded Rs 10 crore in the immediately preceding financial year to deduct 0.1 percent as income-tax on the aggregate purchase value from any single seller exceeding Rs 50 lakh in the financial year. The threshold test base is GST-inclusive per Paragraph 4.9 of CBDT Circular 20/2021. Section 194Q(5) exempts the Central Government and State Governments — but Paragraph 4.5 of Circular 20/2021 makes clear that this exemption does NOT extend to a Government company as defined in Section 2(45) of the Companies Act 2013. Purchases from SAIL, CIL and any other public-sector integrated steel or coal producer in the ordinary course of business are subject to Section 194Q TDS at 0.1 percent on the aggregate exceeding Rs 50 lakh. The Terra Insight Section 194Q buyer-side TDS on chemical purchase above Rs 50 lakh walkthrough and the cement-specific Section 194Q on limestone purchase from mining lease walkthrough frame the operational mechanic for the buyer-side deduction; the payment code for Section 194Q deduction is 1031 under the Section 393 SL 8(ii) purchase of goods schedule — see the Section 393 SL 8(ii) purchase of goods payment code 1031 walkthrough and the operational Section 393 payment code finder tool.

Rule 138 of the CGST Rules 2017 requires an e-way bill on any consignment above Rs 50,000. A typical 25-tonne GBFS tipper truck at Rs 1,400 per tonne mill-gate plus Rs 500 per tonne freight equals Rs 60,000 pre-GST plus 18 percent IGST equals Rs 70,800 total consignment value — well above the Rs 50,000 threshold. The e-way bill validity runs one day per 200 kilometres of distance. Part B of Form GST EWB-01 captures the transporter vehicle number, and any vehicle number mismatch at the inbound gate is a flag for source or transporter follow-up.

Ind AS 2 (Companies (Indian Accounting Standards) Rules 2015) requires the cost of inventories to include the purchase price, import duties and other taxes (other than those subsequently recoverable), transport, handling and other costs directly attributable to acquisition. For GBFS under HSN 2618 attracting 18 percent IGST which is fully recoverable, the IGST is excluded from the inventory cost; the material cost plus inbound freight plus plant unloading handling cost is loaded into the per-tonne slag inventory valuation. Cost is assigned using first-in-first-out or weighted-average per Paragraph 25 of Ind AS 2, with the same formula applied consistently across inventories of similar nature and use.

A worked example — a coastal Andhra Pradesh PSC plant at monthly close

Illustrative — the following figures represent the operating pattern of a Tier-2 Indian cement producer running a 4 MTPA PSC line at a coastal Andhra Pradesh plant with GBFS procurement from SAIL Vishakhapatnam Steel Plant, JSW Vijayanagar and a third-party swing source. Public disclosures by Indian cement majors do not reveal per-plant GBFS source split and landed cost quantum in the granularity below; cross-verify against your own procurement ledger, freight contracts and Ind AS 2 inventory policy before action.

The plant’s PSC production target is 4 MTPA, with an operating blend of 40 percent GBFS in the finished PSC — annual slag requirement approximately 1.6 million tonnes. The three-source procurement split for the illustrative financial year 2026-27 is 60 percent from SAIL Vishakhapatnam Steel Plant (960,000 tonnes), 35 percent from JSW Vijayanagar (560,000 tonnes) and 5 percent from a third-party swing source (80,000 tonnes).

The weighted-average Ind AS 2 inventory cost per tonne of received GBFS across the three-source split (60 percent SAIL at Rs 1,850, 35 percent JSW at Rs 2,200, 5 percent swing at Rs 2,700) works out to approximately Rs 2,020 per tonne. Applied to the 1.6 million tonnes annual requirement, the total GBFS material and freight cost is approximately Rs 323 crore per year, and the 18 percent IGST charged and claimed as input tax credit is approximately Rs 58 crore per year — a large-value input tax credit line that requires disciplined GSTR-2B reconciliation to protect against Section 16(4) time-limit ineligibility.

Section 194Q monitor position for the illustrative financial year 2026-27:

Both SAIL and JSW cross the Rs 50 lakh threshold decisively; the swing source (assumed low volume) may or may not cross depending on the specific FY procurement pattern. The Section 194Q TDS deducted on the aggregate exceeding the threshold is disclosed in Form 3CD Clause 34(a) at tax audit, and the TDS challan payment code applicable is 1031 under the Section 393 SL 8(ii) purchase of goods schedule.

IS 455 batch compliance at the illustrative operating blend of 40 percent GBFS is well within the 25 to 70 percent window, but any batch swinging above 70 percent (over-blending during a high-slag-availability period) or below 25 percent (under-blending during a slag supply constraint) must be flagged in the batch register and re-blended or re-classified. Every 500 tonnes of production requires a physical sampling per IS 455 Clause 8; the plant’s typical daily production of ~11,000 tonnes therefore requires approximately 22 samples per day for the in-house or NABL laboratory testing schedule.

Common reconciliation breakages

Four breakages recur across Indian cement producers running the PSC slag-procurement reconciliation:

• Section 194Q not deducted on SAIL purchases on the erroneous belief that SAIL as a Government company is exempt. The Section 194Q(5) exemption for the Central Government and State Governments does NOT extend to a Government company under Section 2(45) of the Companies Act 2013, and CBDT Circular 20/2021 Paragraph 4.5 explicitly confirms Section 194Q applicability to purchases from SAIL, CIL and other public-sector undertakings in the ordinary course of business. A cement plant that treats SAIL as exempt understates TDS deduction by 0.1 percent on the SAIL aggregate exceeding Rs 50 lakh — for a large PSC plant this can run into tens of lakhs per year and gets flagged at Form 3CD Clause 34(a) reconciliation during tax audit. Reconciliation discipline: the per-seller Section 194Q aggregate monitor treats every steel producer identically regardless of ownership, applies the Rs 50 lakh threshold uniformly on GST-inclusive per Paragraph 4.9 and triggers the 0.1 percent deduction at the time of credit or payment whichever is earlier.

• Ind AS 2 landed cost including or excluding IGST inconsistently across sources. The correct treatment is to exclude the 18 percent IGST from the inventory cost because it is fully recoverable as input tax credit under Section 16 of the CGST Act 2017. A plant that erroneously includes IGST in the inventory cost of one source (say, the swing source where the input tax credit was blocked due to a supplier GSTR-1 non-filing) and excludes it from another (the base-load sources with clean GSTR-2B) creates a per-source inventory cost inconsistency that a cost auditor under the Cost Records and Cost Audit Rules 2014 will surface. Reconciliation discipline: the per-source landed cost breakdown separates the material-plus-freight base (loaded to inventory) from the IGST (claimed as input tax credit against GSTR-2B); any blocked ITC (due to Section 16(2)(c) supplier default) is a separate expense line, not a re-loading of blocked tax into inventory.

• PSC batch slag percentage drift outside the IS 455 25-70 percent window not flagged. A batch operating at 72 percent slag (over-blending during a high-slag-availability period) or at 22 percent slag (under-blending during a supply constraint) is non-conforming to IS 455 Clause 4.1 and cannot legally be sold as PSC without re-blending. A plant that does not run the batch-level slag percentage check in real time on the batch register runs the risk of shipping non-conforming PSC to customers, triggering rejection at the customer’s specification acceptance, a potential replacement or credit note obligation and a BIS licence audit exposure. Reconciliation discipline: the batch production register computes the slag percentage automatically on batch close and flags any batch outside the 25 to 70 percent window before the batch is transferred to the finished-goods PSC silo.

• Rule 138 e-way bill vehicle mismatch at inbound weighbridge not reconciled. An e-way bill generated with vehicle number AB-01-1234 that arrives at the inbound gate on vehicle AB-01-5678 (transporter mid-route vehicle substitution not updated on the e-way bill) is a documentation gap that can trigger a GST officer’s inspection observation during a movement-of-goods audit. Reconciliation discipline: the inbound weighbridge station records the physical vehicle number on the inbound receipt and cross-checks against the e-way bill Part B before the tare-and-gross weighment; any mismatch triggers a transporter follow-up before the receipt is posted to the GBFS inventory ledger.

How a reconciliation platform handles this

A purpose-built cement reconciliation platform ingests every GBFS tax invoice, freight LR, e-way bill and inbound weighbridge slip into a per-source procurement register, holds the per-seller Section 194Q aggregate monitor against the Rs 50 lakh threshold with the 0.1 percent TDS auto-triggering above the threshold, computes the per-batch PSC slag percentage against the IS 455 25 to 70 percent window and flags non-conforming batches for re-blend or re-classification, reconciles the source-wise Ind AS 2 landed cost per tonne into the finished PSC cost of production and cross-links the 18 percent IGST charged by each steel producer to the GSTR-2B input tax credit reconciliation. Standing dashboard controls surface any Section 194Q seller crossing the Rs 50 lakh threshold in real time (including Government-company sellers like SAIL that are commonly mis-classified as exempt), any batch outside the IS 455 window, any e-way bill vehicle mismatch at the inbound gate and any per-source landed cost variance beyond the freight tolerance band. Match-rate improvement of 51 to 88 percent on the GBFS invoice-to-e-way-bill-to-weighbridge-to-tax-audit reconciliation, combined with an ISO 27001:2022 posture and DPDP Act 2023 aligned data handling for regulator-facing submissions, is what makes the platform an infrastructure investment for a Tier-1 or Tier-2 Indian cement producer running a multi-plant PSC portfolio against multiple steel-producer supply relationships and Section 194Q Government-company nuances — rather than a spreadsheet substitute that leaves the per-seller threshold monitoring, the batch-level IS 455 compliance and the e-way bill inbound reconciliation as manual overheads on a hybrid procurement-plus-quality-plus-finance team. The commercial pillar for the cement sub-cluster is cement reconciliation software India; the broader authority for the platform is reconciliation software India.

Cross-cluster bridges and where to read next

The slag-steel-mill-cement-blending inter-industry supply mechanic documented here anchors the Cement Wave 1 Theme 5 fly-ash-and-slag supplementary-cementitious-material cluster. The parallel coal-purchase Section 194Q walkthrough at coal cess and clean-energy cess on cement plant coal purchase with Section 194Q TDS and the pet-coke import inverted-duty walkthrough at pet-coke import IGST at a cement plant under Chapter 27 and Notification 9/2022 frame the sibling thermal-fuel dimension of the same cement plant procurement stack. The limestone-royalty cornerstone at limestone royalty, DMF and NMET cost accounting for an Indian cement plant and the mining-lease walkthrough at MMDR Act 1957 limestone mining lease for the cement industry cover the upstream limestone-source dimension of the same cement plant, and the DMF-NMET contribution walkthrough at District Mineral Foundation and NMET cement mining 30 percent contribution covers the state-level fiscal-cess dimension of the same limestone source stack.

The Chemicals cross-cluster siblings that share the Section 194Q and Chapter 27 regulatory anchors — Section 194Q buyer-side TDS on chemical purchase above Rs 50 lakh, Chapter 27 IDS refund bar under Notification 9/2022 for chemicals and the petrochemical refinery downstream Chapter 27 reconciliation — frame the parallel operational mechanic in the Chemicals cluster. The Chemicals Wave 3 environmental-clearance cornerstone at MoEFCC CTE and CTO clearance chemical plant cost accounting India is the design template for the cement-industry environmental clearance and CTO renewal mechanic that runs in parallel to the procurement mechanic documented here.

The design-and-operate reconciliation methodology framework — mapping each inter-industry procurement transaction to a specific reconciliation surface, holding the per-seller Section 194Q monitor as a standing control, timing the IS 455 batch-level slag percentage compliance test correctly at batch close and threading the Rule 138 e-way bill inbound gate reconciliation into the weighbridge station process — sits in reconciliation failure mode analysis for India and reconciliation playbook for monthly close; the specific Section 194Q payment code operationalisation sits in Section 393 SL 8(ii) purchase of goods payment code 1031 walkthrough and the operational Section 393 payment code finder tool; the input-tax-credit protection mechanic sits in the Section 16(4) ITC exposure calculator.

The five FAQs below address the operational questions Indian cement CFOs, procurement heads, plant quality leads and statutory auditors ask most often when building the source-wise GBFS procurement register and the batch-level IS 455 compliance control under the five regulatory anchors — IS 455:2015, HSN Chapter 2618 with 18 percent IGST, Section 194Q with the Government-company clarification per CBDT Circular 20/2021 Paragraph 4.5, Rule 138 e-way bill and Ind AS 2 landed-cost inventory valuation.

Terra Insight Editorial Team Reconciliation Infrastructure

Content authored by practitioners with experience at Amazon India, Intuit QuickBooks, and the Tata Group. Meet the team →

Published 27 July 2026

Domain expertise

TDS Reconciliation GST Input Credit Platform Settlements NACH Batch Matching Bank Reconciliation Form 26AS Matching ERP Integrations Enterprise Finance Ops

Reviewed by

NK

Navin Krishnan

Managing Director & Founder — Terra Insight

Ex Amazon India · Intuit QuickBooks · Tata nexarc

ISO 27001:2022 Patent Pending Incorporated 2024