GSTR-2B matching for oil, gas, and non-GST supplies

Operating in the downstream petroleum, natural gas distribution, or petrochemical manufacturing sectors involves navigating a split indirect tax structure. Unlike standard manufacturing units where outward supplies attract uniform GST rates, hydrocarbon companies sell both taxable products and non-GST goods from the same business entity. Refineries produce taxable petrochemicals alongside non-GST diesel. Retail fuel outlets sell taxable lubricants and car-care accessories alongside non-GST petrol. City gas distributors supply natural gas to industrial consumers alongside taxable compressed biogas and pipeline network leasing services.

This dual regime creates substantial reconciliation friction. Inward vendor invoices for civil works, pipeline maintenance, enterprise software licenses, plant machinery, security, and administrative overheads appear in Form GSTR-2B with standard GST charges. However, claiming 100 percent of this tax credit breaches statutory limits. Because a large fraction of outward revenue arises from non-GST petroleum products, taxpayers must isolate exclusive credits, identify shared common credits, and execute statutory monthly reversals.

Statutory framework under Section 9(2) and non-taxable supplies

Under Section 9(2) of the CGST Act, the central tax on five specific petroleum goods is deferred until a date notified by the Government on the recommendations of the GST Council. These five items are:

Petroleum crude
High speed diesel (HSD)
Motor spirit (commonly known as petrol)
Natural gas
Aviation turbine fuel (ATF)

These five products are outside the immediate levy of GST and continue to attract State Value Added Tax (VAT) and Central Excise Duty. Under Section 2(78) of the CGST Act, a supply of goods or services which is not leviable to tax under the Act is defined as a non-taxable supply. Crucially, under Section 2(47) of the CGST Act, the statutory definition of exempt supply explicitly includes non-taxable supply.

This statutory linkage has direct consequences for credit admissibility. Under Section 17(2) of the CGST Act, where goods or services are used partly for effecting taxable supplies (including zero-rated supplies) and partly for exempt supplies, the input tax credit is restricted to the amount attributable to taxable supplies. Because Section 2(47) treats non-taxable petroleum products as exempt supplies, the turnover from crude oil, petrol, diesel, ATF, and natural gas forms part of exempt turnover when determining credit restrictions.

Notice risk on non-GST turnover: Omission of petroleum revenue from exempt turnover calculations is an immediate audit trigger. Automated tax algorithms compare outward non-GST supplies reported in Table 3.1(e) of Form GSTR-3B against input tax credit availed in Table 4(A)(5). If common input tax credit is availed without corresponding reversals under Rule 42 in Table 4(B)(1), the GST portal generates scrutiny notices under Form GST DRC-01C with interest demands under Section 50(1).

Rule 42 formula for apportioning common inputs and services

Where an entity incurs input tax on goods and services used for both taxable operations and non-GST petroleum operations, the taxpayer must apply the mathematical apportionment prescribed under Rule 42(1) of the CGST Rules. The calculation follows a strict sequence during each monthly tax period:

Total Tax T → Less Exclusive (T1 + T2 + T3) = C1 → Less Taxable T4 = Common Credit C2 → Compute D1 = (E / F) × C2 → Reverse D1 in Table 4(B)(1)

The individual variables defined in Rule 42(1) operate as follows:

Total input tax (T): Total tax charged on inputs and input services received during the tax period, as reflected in Form GSTR-2B.
Exclusively non-business credit (T1): Input tax on goods or services intended exclusively for non-business purposes.
Exclusively exempt credit (T2): Input tax on supplies used exclusively for effecting exempt or non-taxable supplies (such as fuel additives blended exclusively into non-GST retail motor spirit, or dedicated tank maintenance for diesel storage).
Blocked credit (T3): Input tax on supplies blocked under Section 17(5) of the CGST Act (such as executive passenger motor vehicles or staff canteen catering).
Net credited amount (C1): C1 equals T minus (T1 + T2 + T3). This amount is credited to the electronic credit ledger.
Exclusively taxable credit (T4): Input tax on supplies used exclusively for taxable supplies (such as packaging material for retail engine oils, industrial chemical catalysts for polymer synthesis, or repair of taxable compressed biogas cylinders).
Common credit (C2): Common credit C2 equals C1 minus T4. This represents shared administrative, operational, legal, and facilities tax credit.
Ineligible common credit (D1): D1 equals (E / F) multiplied by C2, where E is the aggregate value of exempt supplies (including non-GST supplies of petroleum crude, petrol, diesel, natural gas, and ATF) and F is the total turnover in the State during the tax period.
Non-business common credit (D2): Where common inputs are also used for personal or non-business purposes, D2 equals 5 percent of C2.
Eligible common credit (C3): Net retained common credit C3 equals C2 minus (D1 + D2).

The total monthly reversal amount (D1 + D2) must be declared in Table 4(B)(1) of Form GSTR-3B. For a comprehensive walkthrough of the standard formula mechanics, read our detailed guide to ITC reversal Rule 42 common credit formula.

Rule 43 formula for capital goods in mixed petroleum operations

Capital goods acquired by entities dealing in mixed petroleum supplies are governed by Rule 43(1) of the CGST Rules. Because capital assets possess an enduring life, the statutory mechanism treats each capital asset as having a useful life of five years (60 months) from the date of the tax invoice:

Exclusively exempt capital goods: Under Rule 43(1)(a), input tax on capital goods used exclusively for exempt or non-taxable supplies (such as fuel dispensing pumps installed at a retail fuel outlet dispensing only petrol and diesel) must not be credited to the electronic credit ledger.
Exclusively taxable capital goods: Under Rule 43(1)(b), input tax on capital assets used exclusively for taxable supplies (such as automated blending equipment for branded lubricants or bottling machinery for specialty petrochemical solvents) is credited in full to the electronic credit ledger.
Common capital goods: Under Rule 43(1)(c), tax on common capital goods (such as common enterprise data servers, shared administrative buildings, fire safety tender vehicles, or dual-purpose distribution manifolds) is credited directly to the electronic credit ledger as amount A.

For common capital goods, the monthly common credit attributable to the tax period is Tm = Tc / 60, where Tc is the aggregate tax of all common capital assets whose useful life remains active. The monthly reversal Te is calculated by applying the turnover ratio:

Te = (E / F) × Tm

Here, E represents the monthly exempt turnover (including non-GST petroleum supplies) and F represents total state turnover. The resulting amount Te must be added to output tax liability or reversed in Table 4(B)(1) of Form GSTR-3B for every tax period across the 60-month useful life. To review depreciation interactions under Section 16(3) and asset retirements, consult our analysis of the ITC reversal Rule 43 capital goods formula.

Worked scenario for regional fuel and petrochemical distributor

Consider an integrated regional fuel and petrochemical enterprise, Western Hydrocarbons Pvt Ltd, operating in Gujarat during September 2026. The business operates bulk fuel storage terminals, a lubricants packaging facility, and an industrial chemical supply division.

During September 2026, the company records the following outward turnover:

Taxable outward supply (automotive lubricants, base oils, specialty greases at 18% GST): ₹4,00,00,000
Non-GST outward supply (high speed diesel and motor spirit under Section 9(2)): ₹16,00,00,000
Total turnover in the State (F): ₹20,00,00,000
Exempt turnover ratio (E / F): ₹16,00,00,000 / ₹20,00,00,000 = 0.80 (80 percent)

During the same period, the inward purchase register records ₹45,00,000 in total input tax (T). GSTR-2B reconciliation reveals the following categorization across vendor invoices:

Supply description	Supplier name	Taxable value	GST in 2B	Classification	Action and GSTR-3B treatment
Plastic bottles and packaging cartons for retail lubricants	Penta Pack Industries Ltd	₹50,00,000	₹9,00,000	T4 (Exclusively taxable)	Eligible; full credit in Table 4(A)(5); no reversal
Underground diesel tank calibration and certification	Accura Hydro Testing LLP	₹20,00,000	₹3,60,000	T2 (Exclusively non-GST)	Ineligible under Section 17(2); do not claim or reverse in Table 4(B)(1)
Corporate security and terminal fire guarding services	Sentinel Industrial Guarding Ltd	₹40,00,000	₹7,20,000	Common input service (C2)	Avail ₹7,20,000 in Table 4(A)(5); reverse D1 (80% = ₹5,76,000) in Table 4(B)(1)
Terminal administrative ERP license and cloud hosting	Enterprise Cloud Systems Ltd	₹30,00,000	₹5,40,000	Common input service (C2)	Avail ₹5,40,000 in Table 4(A)(5); reverse D1 (80% = ₹4,32,000) in Table 4(B)(1)
Executive transport sedan lease	Regal Mobility Services Ltd	₹10,00,000	₹2,80,000	T3 (Blocked Section 17(5))	Blocked under Section 17(5)(a); report reversal in Table 4(B)(1)
Compressor spare parts for base oil manufacturing	Apex Precision Engineering Ltd	₹25,00,000	₹4,50,000	Missing in 2B	Supplier failed to file GSTR-1; credit blocked under Section 16(2)(aa); hold ₹4,50,000

Mathematical computation of Rule 42 reversal

In our practice assisting downstream fuel distribution clients, our client experienced this directly during a recent desk review. In this worked scenario, Western Hydrocarbons Pvt Ltd must segregate the common overheads carefully.

Common credit pool (C2): Common services comprise security (₹7,20,000) and ERP hosting (₹5,40,000), giving total common credit C2 = ₹12,60,000.
Ineligible credit attributable to non-GST turnover (D1): D1 = (E / F) × C2 = (₹16,00,00,000 / ₹20,00,00,000) × ₹12,60,00,000 = 0.80 × ₹12,60,00,000 = ₹10,08,000.
Eligible retained common credit (C3): C3 = C2 minus D1 = ₹12,60,00,000 minus ₹10,08,000 = ₹2,52,000.

In Form GSTR-3B for September 2026, the company avails the ₹9,00,000 exclusive taxable credit and ₹12,60,000 common credit in Table 4(A)(5). It simultaneously reports the mandatory Rule 42 reversal of ₹10,08,000 alongside the blocked vehicle credit of ₹2,80,000 in Table 4(B)(1). The unfiled compressor invoice of ₹4,50,000 is placed on administrative payment hold until it auto-populates in a subsequent Form GSTR-2B. To see how these entries integrate into the wider return structure, read our breakdown of GSTR-3B Table 4B ITC reversal rules.

Common pitfalls for petroleum and mixed supply accountants

Classifying non-GST turnover as zero-rated instead of exempt: Accountants sometimes confuse non-GST petroleum turnover with zero-rated supplies. Zero-rated supplies under Section 16 of the IGST Act apply strictly to physical exports and supplies to SEZ developers or units, which enjoy full credit without apportionment. Non-GST supplies are statutorily treated as exempt supplies under Section 2(47), requiring mandatory credit reversal under Section 17(2).
Failing to conduct the annual true-up under Rule 42(2): Monthly reversals calculated using monthly turnover figures are provisional. Under Rule 42(2), the taxpayer must recompute D1 and D2 for the entire financial year using total annual figures before the due date of the return for September (extended to 30 November) following the financial year. If annual calculations show a shortfall in reversals, the difference must be paid with interest under Section 50(1) starting from 1 April of the succeeding financial year.
Omitting non-GST supply turnover from Form GSTR-1 Table 8: While individual B2B tax invoices are not issued under GST for non-taxable petroleum goods, outward non-GST turnover must be declared in Table 8 of Form GSTR-1 and Table 3.1(e) of Form GSTR-3B as clarified in the GSTN GSTR-1 User Manual. Leaving Table 8 blank while reporting high turnover in state VAT returns creates sharp discrepancies during risk profiling.
Claiming ITC on capital assets dedicated to retail fuel dispensing: Retail petrol pumps frequently procure automated tank gauging systems, canopy structures, and multi-product fuel dispensers. Because these assets are used exclusively for dispensing non-taxable petrol and diesel, input tax credit is blocked in its entirety under Rule 43(1)(a). Availing credit on these assets leads to recovery proceedings under Section 73 or Section 74.

Subject: Missing invoice in GSTR-2B - Western Hydrocarbons Pvt Ltd Dear Accounts Team at Apex Precision Engineering Ltd, During our monthly GSTR-2B reconciliation for September 2026, we observed that the following tax invoice has not auto-populated in our Form GSTR-2B: Invoice Number: APE/26-27/0412 Invoice Date: 12 September 2026 Taxable Value: ₹25,00,000 GST Amount: ₹4,50,000 (IGST) Under Section 16(2)(aa) of the CGST Act and Rule 36(4), our company cannot claim input tax credit until this invoice is reported in your Form GSTR-1 and communicated in our Form GSTR-2B. Because our manufacturing operations require prompt input tax credit availment, payment of the tax amount (₹4,50,000) has been placed on hold in accordance with our purchase order terms until the invoice appears in our Form GSTR-2B. Please confirm whether this invoice has been filed in your Form GSTR-1. Regards, Manager (Taxation & Compliance) Western Hydrocarbons Pvt Ltd

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Frequently asked questions

Are the five petroleum products considered exempt supplies under GST?

Yes. Under Section 9(2) of the CGST Act, GST on petroleum crude, high speed diesel, motor spirit (petrol), natural gas, and aviation turbine fuel is deferred until notified. Under Section 2(78), these goods are non-taxable supplies, and Section 2(47) explicitly defines exempt supply to include non-taxable supply. Consequently, their turnover must be included in exempt turnover E when calculating credit apportionments.

How does non-GST petroleum turnover affect common ITC under Rule 42?

Because non-GST petroleum sales constitute exempt supplies under Section 2(47), any common input tax credit C2 incurred on shared corporate overheads, security services, IT software, legal retainers, or joint storage facilities must be apportioned. The reversal amount D1 equals (E / F) multiplied by C2, where E is the exempt and non-GST turnover and F is the total state turnover. D1 is reversed permanently in Table 4(B)(1) of Form GSTR-3B.

Can an oil marketing company claim 100 percent credit on specialized retail dispensing units?

No. Under Rule 43(1)(a) of the CGST Rules, input tax on capital goods used exclusively for non-taxable or exempt supplies (such as fuel dispensing pumps dispensing only petrol and diesel) cannot be credited to the electronic credit ledger. Conversely, equipment used exclusively for taxable supplies (such as lubricant filling machines) is eligible for 100 percent credit under Rule 43(1)(b).

Where are non-GST petroleum supplies reported in Form GSTR-1 and Form GSTR-3B?

In Form GSTR-1, outward non-GST supplies are reported at the summary level in Table 8. In Form GSTR-3B, outward non-GST supplies are reported in Table 3.1(e). Inward non-GST procurement is reported in Table 5 of Form GSTR-3B.

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Last checked: 19 October 2026. Sources: CBIC Tax Information Portal (CGST Act Section 9), CBIC Tax Information Portal (CGST Act Section 17), CBIC CGST Rules Rule 42, CBIC CGST Rules Rule 43, GSTN Returns Portal User Manual (GSTR-1), GSTN Returns Portal User Guide (GSTR-3B).