GST Rules 42 & 43: Exempt Sales Cannot Trigger Reversal of Entire ITC

Summary: The presence of exempt sales in a business does not automatically make its entire input tax credit (ITC) common credit. Under Rules 42 and 43 of the CGST Rules, 2017, credit attributable exclusively to taxable supplies, exclusively to exempt supplies, blocked credit and genuinely common credit must be identified separately before applying the prescribed reversal mechanism. Rule 42 governs inputs and input services, while Rule 43 provides a distinct monthly allocation mechanism for capital goods. Applying the exempt-turnover percentage to total ITC without first identifying the common-credit pool can substantially overstate the reversal. The article discusses Nitin Bakers Private Limited v. Vijay Singh Visen, Deputy Commissioner & Others, Appeal No. APL/108/LCK/2026, decided by the Lucknow State Bench of the GST Appellate Tribunal on 21 October 2026. The supplied order summary records a total disputed demand of ₹56,24,458.40 covering multiple issues, including ITC differences, GSTR-9/GSTR-9C reconciliation and an alleged short reversal of ₹51,756.67 under Rules 42 and 43. The Tribunal reportedly set aside the impugned orders and remanded the matter for fresh adjudication and verification. The remand does not establish that every ITC claim was correct; it reinforces the need for documentary reconciliation and a legally supported computation.

Exempt Sales Do Not Make All ITC Common: Rules 42 and 43 Must Be Applied Correctly Before Raising GST Demands

1. A turnover percentage cannot replace the statutory calculation

Consider a retailer selling both taxable and exempt goods.

The retailer purchases taxable goods, pays GST on those purchases and claims eligible input tax credit. The retailer also incurs common expenses such as shop rent, accounting charges and software charges.

During scrutiny, suppose the officer finds that exempt sales constitute 30% of turnover and proposes reversal of 30% of the entire ITC.

That calculation may look simply. But simplicity does not make it lawful.

The officer must first distinguish credit attributable exclusively to taxable supplies, credit attributable exclusively to exempt supplies, blocked credit and genuinely common credit. Only the common pool enters the proportionate reversal formula under Rule 42.

The central word is common.

If this classification is skipped, the resulting tax, interest and penalty can all rest on the wrong foundation.

2. What the Nitin Bakers order tells taxpayers

In Nitin Bakers Private Limited v. Vijay Singh Visen, Deputy Commissioner & Others, Appeal No. APL/108/LCK/2026, the Lucknow State Bench of the GST Appellate Tribunal dealt with a total disputed demand of ₹56,24,458.40 for FY 2018–19. The supplied order records a decision dated 21 October 2026.

The dispute covered several matters:

Disputed issue	Amount recorded in the supplied order summary
ITC difference	₹22,589.62
GSTR-9/GSTR-9C difference	₹25,93,217.12
Alleged short reversal under Rules 42 and 43	₹51,756.67
Total disputed demand, including tax, interest and penalty	₹56,24,458.40

These figures must not be confused: the entire ₹56.24 lakh demand was not solely a Rule 42/43 reversal demand.

The Tribunal’s recorded order summary states that the lower authorities had failed to properly reconcile the statutory returns and ITC reversals. It set aside the impugned orders and remanded the matter to the adjudicating authority for fresh adjudication and proper verification.

What the decision does—and does not—establish

The useful lesson is that differences require verification and reconciliation before liability is finally determined.

However:

• A remand is not a final declaration that every credit claim is correct.
• The taxpayer must still substantiate the claim.
• The supplied order also records difficulties arising from non-appearance and lack of supporting evidence during the earlier appeal.

The case therefore carries a message for both sides: the department must verify the figures, and the taxpayer must place the evidence on record.

3. Rules 42 and 43 are different rules for different credit pools

Particular	Rule 42	Rule 43
Subject	Inputs and input services	Capital goods
Ordinary examples	Trading stock, raw materials, eligible rent and professional services	Eligible machinery, equipment and capitalised business goods
First exercise	Separate exclusive and ineligible credit from common credit	Classify assets according to exclusive or common use
Main allocation mechanism	Exempt-turnover ratio applied to common input/service credit	Prescribed monthly allocation over a five-year useful life for common capital goods
Annual adjustment	Express financial-year finalisation under Rule 42(2)	Do not automatically import Rule 42’s annual mechanism into Rule 43

Both rules must be read with the applicable eligibility restrictions and the version of the law governing the disputed period. Special provisions concerning real-estate projects are outside the ordinary manufacturing and trading illustrations in this article.

4. Rule 42 begins with classification—not with the exempt-sales ratio

The rule uses a sequence of identified amounts:

Symbol	Meaning
T	Total input tax on inputs and input services for the tax period
T1	Tax attributable exclusively to non-business purposes
T2	Tax attributable exclusively to exempt supplies
T3	Credit unavailable under Section 17(5)
T4	Credit attributable exclusively to taxable supplies, including zero-rated supplies
C1	Balance after excluding T1, T2 and T3
C2	Common credit remaining after also removing T4

The formulas are:

C1=T-(T1+T2+T3)

C2=C1-T4

Only after arriving at C2 does the exempt-supply calculation arise:

D1=frac{E}{F} times C2

Here, E is the relevant exempt-supply value and F is the total turnover in the State of the registered person for the tax period, subject to the prescribed adjustments and exclusions.

The error to avoid is:

“Total ITC × exempt-turnover percentage.”

That is not a substitute for the classification required by Rule 42.

5. Illustration: A retailer selling taxable and exempt goods

Assume the following figures for one month. The product classifications are assumed to have been correctly determined under the applicable notifications.

Turnover

Particular	Amount
Taxable sales	₹70,00,000
Exempt sales	₹30,00,000
Total sales	₹1,00,00,000
Exempt-turnover proportion	30%

Input tax

Particular	ITC
Purchases used exclusively for taxable trading sales	₹6,00,000
Eligible common rent, software and accounting services	₹60,000
Total	₹6,60,000

Assume there is no non-business use, blocked credit or separately incurred input tax exclusively attributable to exempt supplies.

Correct calculation

The ₹6,00,000 attributable exclusively to taxable sales is T4.

Common credit is only ₹60,000.

Therefore:

D1=30%times ₹60,000=₹18,000

Incorrect calculation

If the officer applies 30% to the entire ₹6,60,000:

30%times ₹6,60,000=₹1,98,000

The proposed reversal is overstated by ₹1,80,000.

This difference arises before adding any interest or penalty. The illustration follows the segregation and common-credit formula prescribed in Rule 42; the figures are hypothetical.

The retailer’s responsibility

The retailer must establish that the ₹6,00,000 genuinely relates exclusively to taxable outward supplies. Purchase descriptions, item-wise stock records, sales classification and invoice mapping matter.

A ledger label stating “taxable purchases” is helpful, but the underlying records must support it.

6. Exempt goods purchased without GST do not create credit to reverse

A trader may purchase exempt goods without GST and sell those goods as exempt supplies.

There is no input tax on that particular exempt purchase to claim or reverse. However, common taxable services—such as eligible rent or accounting services supporting both sales streams—can still require proportionate reversal.

Illustration

A shop has:

• Exempt goods purchased without GST;
• Taxable goods carrying eligible ITC of ₹2,00,000;
• Eligible common service ITC of ₹20,000;
• Exempt turnover of 40%.

Assuming the taxable goods are exclusively linked to taxable sales and there is no other disallowance, the common-credit reversal is:

40%times ₹20,000=₹8,000

It is not 40% of ₹2,20,000.

Equally, the trader cannot claim that the absence of GST on exempt purchases eliminates reversal of genuinely common service credit. Both sides of the calculation must be respected.

7. Illustration: A manufacturer with taxable and exempt product lines

Assume a manufacturer has:

Input-tax category	Amount
Raw materials exclusively for taxable products	₹8,00,000
Inputs exclusively for exempt products	₹50,000
Eligible common inputs and services	₹1,00,000
Total input tax	₹9,50,000

Exempt turnover is 20% of relevant total turnover. There is no non-business use or blocked credit in this illustration.

The treatment is:

1. ₹8,00,000 is exclusive taxable credit, subject to ordinary eligibility.

2. ₹50,000 attributable exclusively to exempt products is excluded.

3. Only ₹1,00,000 enters the common-credit pool.

4. The exempt share of common credit is ₹20,000.

Thus:

Component	Amount
Exclusive exempt credit excluded	₹50,000
Common credit attributable to exempt supplies	₹20,000
Total ineligible portion in this illustration	₹70,000
Eligible balance	₹8,80,000

If the ₹50,000 was never availed, it must not be demanded again as though it remained an additional outstanding reversal. The calculation must distinguish credit never claimed from credit claimed and subsequently reversed.

8. Separate production lines can matter—but they require proof

A manufacturer may have one production line exclusively producing taxable goods and another exclusively producing exempt goods.

That distinction can be important in classifying direct inputs, services and capital goods. Nevertheless, factory-wide services may remain common even where production machinery is separate.

For example:

Item	Possible treatment, depending on evidence
Raw material consumed only in taxable products	Exclusive taxable credit
Service used only for exempt production	Exclusive exempt attribution
Statutory audit covering the whole business	Common service credit
Eligible machine used only for taxable production	Exclusive taxable capital-goods credit
Eligible generator serving both production lines	Common capital goods

The taxpayer should support the distinction with production records, material-consumption records, asset identification and service contracts. Classification must reflect actual use or intended use under the rule, not merely the name of the accounting ledger.

9. The 5% non-business adjustment is not automatic in every business

Rule 42 provides D2 equal to 5% of C2 where common inputs and input services are used partly for business and partly for non-business purposes.

The condition matters.

The existence of exempt sales is not, by itself, evidence of personal or non-business use. An exempt sale can still be a business transaction.

Illustration

A retailer has ₹1,00,000 of common service ITC supporting taxable and exempt business sales. The exempt proportion is 25%.

If the common services are used wholly for business:

• D1 is ₹25,000.
• D2 should not be mechanically added merely because exempt sales exist.

If those common services are also partly used for non-business purposes, Rule 42(1)(j) must be examined, including its 5% mechanism.

Identifying some exclusively non-business credit as T1 does not automatically establish that all remaining common expenses are wholly business-related. Each relevant category must be examined.

10. Rule 43: Capital-goods credit cannot simply be mixed with trading-stock credit

For capital goods, the first distinction is between:

• Exclusive non-business or exempt use;
• Exclusive taxable use, including zero-rated supplies; and
• Common use.

For eligible common capital goods, Rule 43 prescribes a five-year useful life from the invoice date and a monthly allocation mechanism based on 60 months.

This does not mean that eligible ITC is necessarily claimed in 60 instalments. The common credit is credited under the rule, while its attributable exempt portion is determined through the prescribed monthly mechanism.

Illustration: Common machinery

Assume:

• Eligible GST credit on one common machine: ₹6,00,000.
• The machine is within its prescribed useful life.
• It serves taxable and exempt production.
• Exempt turnover for the relevant month: 25%.

Monthly attributable credit:

₹6,00,000div60=₹10,000

Exempt portion for that month:

25%times₹10,000=₹2,500

The ordinary monthly reversal in this illustration is ₹2,500—not 25% of the entire ₹6,00,000 in that month.

For multiple assets purchased on different dates, an asset-wise schedule is necessary. The remaining useful life and any change in use must also be considered.

11. Illustration: A retailer’s common business equipment

Assume a retailer purchases eligible capitalised equipment serving both taxable and exempt sales:

Particular	Amount
Eligible GST credit	₹60,000
Monthly attributable credit over 60 months	₹1,000
Exempt-turnover proportion for the month	40%
Monthly exempt attribution	₹400

This is a Rule 43 calculation.

It should not also be included in the Rule 42 pool for inputs and input services. Otherwise, the same credit can suffer duplicate attribution.

This illustration assumes that the equipment qualifies as capital goods, satisfies the ordinary ITC conditions and is not blocked by another provision.

12. Do not reverse the same credit twice

Duplicate demands can arise when:

• A taxpayer has already excluded ineligible credit before claiming ITC;
• Monthly reversal has already been made;
• An annual adjustment has already been paid;
• DRC-03 payment is not considered;
• Capital-goods credit enters both Rule 42 and Rule 43 workings; or
• A return difference and a reversal allegation overlap.

Rule 42 expressly requires comparison of final annual attribution with amounts already determined during the year. A demand must therefore address the net outstanding shortfall, rather than ignore earlier reversals.

Illustration

Particular	Amount
Final annual reversal required	₹1,20,000
Reversal already made during the year	₹90,000
Additional principal reversal	₹30,000

The outstanding principal is ₹30,000—not ₹1,20,000 again.

Interest, if applicable, requires its own legally supported calculation.

13. Annual finalisation under Rule 42 is a two-way adjustment

Monthly calculations under Rule 42 are followed by final calculation for the financial year.

The result can be:

• Additional reversal, where final annual attribution exceeds the aggregate already determined; or
• Excess reversal eligible to be reclaimed within the prescribed framework, where the monthly aggregate exceeds final annual attribution.

Illustration

Particular	Amount
Aggregate monthly reversals	₹1,50,000
Final annual attribution	₹1,20,000
Excess reversal	₹30,000

The rule recognises this excess. Annual finalisation is not designed only to collect additional amounts from taxpayers.

A deadline caution

The official CBIC Rule 42 text consulted for this article retains the September-linked annual-finalisation language. Taxpayers should not assume that a different deadline appearing in another GST provision automatically changes Rule 42. The rule and notifications applicable to the relevant year must be checked before making an adjustment or reclaim.

14. Different GST rates do not by themselves create exempt supplies

A business selling taxable goods at different rates does not become a taxable-and-exempt business merely because the rates differ.

Rule 42’s exempt-supply calculation concerns exempt supplies; it is not a formula for reducing credit whenever output tax is lower than input tax. Equally, zero-rated supplies are expressly included on the eligible side of the rule.

Illustration

A trader sells one category of taxable goods at a lower rate and another at a higher rate. If both are taxable supplies carrying ordinary ITC entitlement, the rate difference alone does not establish a Rule 42 exempt-supply reversal.

Rate-specific conditions restricting ITC, where applicable, require separate examination.

15. Interest must be examined separately from the reversal

Two different questions must not be merged:

1. How much credit must be reversed?

2. Under which provision, on what amount and for which period is interest payable?

Annual shortfall under Rule 42(2)

Rule 42(2)(a) specifically refers to interest under Section 50(1) on the excess annual attribution, from 1 April of the succeeding financial year until payment.

A taxpayer should therefore not assume that the annual-adjustment interest issue disappears merely because credit remained available in the ledger.

Wrongly availed and utilised ITC under Section 50(3)

Section 50(3) addresses ITC wrongly availed and utilised. Rule 88B (3) prescribes calculation from utilisation until reversal or payment, using the prescribed utilisation mechanism.

Where that is the provision invoked, mere availment and actual utilisation must be distinguished.

Illustration

Suppose an officer raises Section 50(3) interest on the entire disputed ITC from its original availment date.

The taxpayer should require a working identifying:

• The wrongly availed amount;
• The date and extent of utilisation under Rule 88B;
• The relevant ledger balances; and
• The reversal or payment date.

But this argument should not be indiscriminately substituted for the separate express annual-shortfall provision under Rule 42(2).

Rule 43 demands

For Rule 43 disputes, the demand should identify the relevant asset-wise monthly attribution and the legal basis for interest. A single unexplained interest figure on the entire capital-goods ITC is not a substitute for that exercise.

16. Penalty cannot be calculated before the correct principal liability is established

If the principal reversal is inflated, a percentage-based penalty can also become inflated.

The officer must first determine the correct underlying liability, account for earlier reversals and payments, and apply the demand and penalty provisions governing the relevant period.

For example, Section 74A distinguishes non-fraud cases from cases involving fraud, wilful misstatement or suppression to evade tax, and provides different penalty consequences. It also contains specified payment-based relief. These conditions cannot be replaced by a general assumption that every reconciliation difference is fraudulent.

However, taxpayers should not take the opposite extreme and say that an accounting or classification dispute can never attract a statutory penalty. The applicable provision, facts and available relief must be examined.

17. A return mismatch is a starting point for inquiry—not the completed Rule 42 calculation

GSTR-3B, GSTR-9, GSTR-9C and the books may present figures differently because of classification, adjustments or reporting errors. The difference must be explained and tested; it should neither be automatically treated as liability nor casually dismissed.

The Nitin Bakers remand is useful here. The recorded reason for fresh adjudication was the need for proper reconciliation and verification of returns and reversals.

A useful reconciliation should show:

Item	What should be established
Gross input tax in books	Starting figure and exclusions
ITC actually availed	Credit genuinely entering returns/ledger
Exclusive taxable credit	Basis for T4 classification
Exclusive exempt and blocked credit	Whether never claimed or later reversed
Common input/service credit	Rule 42 pool
Capital-goods credit	Separate Rule 43 schedule
Earlier reversals	Return period, tax head and amount
DRC-03 payments	Liability against which payment was made
Net disputed balance	Difference after all adjustments

This turns an assertion into a verifiable working.

18. What a proper notice working should disclose

For an effective response, the taxpayer should be able to understand the department’s computation.

For Rule 42

The working should identify:

• The input/service ITC taken as T;
• The amounts treated as T1, T2, T3 and T4;
• The resulting C2;
• The exempt-supply value E and turnover F;
• Why any D2 adjustment is attracted;
• Monthly and annual treatment; and
• Earlier reversals deducted from the proposal.

For Rule 43

It should identify:

• The assets covered;
• Invoice dates and ITC;
• Exclusive or common use;
• Remaining prescribed useful life;
• Monthly attributable amounts;
• The turnover ratio applied; and
• Amounts already reversed.

A taxpayer receiving only a lump-sum proposal should request the underlying workings and submit the taxpayer’s own computation with records.

19. Suggested wording for a taxpayer’s representation

The following is a drafting framework, not a substitute for case-specific figures:

The proposed calculation treats the entire input tax credit as common credit without first determining the amounts required to be segregated under Rule 42.

Credit attributable exclusively to taxable supplies, including zero-rated supplies where applicable, is required to be identified as T4 and excluded before arriving at C2. The exempt-turnover ratio cannot therefore be applied to the entire ITC merely because exempt turnover exists.

We enclose an invoice-wise classification, turnover reconciliation and month-wise reversal statement. Capital-goods credit has been separately examined under Rule 43 and has not been included in the Rule 42 common-credit pool.

The enclosed statement also identifies reversals already made and amounts, if any, already paid. These must be considered to avoid duplicate recovery.

We request verification of the enclosed records and provision of the department’s detailed computation. Any surviving interest proposal may kindly identify the applicable statutory provision, amount, period and utilisation working wherever relevant. Penalty may be considered only under the provision applicable to the disputed period and on the facts established.

The structure follows the separate classification and computation requirements in Rules 42 and 43 and the distinct interest mechanism under Rule 88B.

20. Records that protect manufacturers and retailers

The practical defence begins before the notice arrives.

Businesses should maintain:

1. A product-wise taxable/exempt classification with the applicable legal basis.

2. Purchase and expense coding distinguishing exclusive taxable, exclusive exempt, blocked and common items.

3. A separate capital-goods register with invoice dates and use.

4. Monthly reversal workings by tax head.

5. Rule 42 annual-finalisation workings.

6. GSTR-3B, GSTR-9, GSTR-9C and books reconciliation.

7. Evidence of reversals and DRC-03 payments.

8. Supporting records for claimed exclusive use.

These records help demonstrate the classifications the rules require. Without them, an otherwise sound legal objection may remain unproved. The earlier evidentiary difficulties recorded in Nitin Bakers make that practical point particularly relevant.

Conclusion

Rules 42 and 43 are allocation provisions. They do not permit the officer to treat every rupee of ITC as common merely because the business reports exempt turnover.

For a retailer, taxable trading-stock credit must be distinguished from common shop expenses. For a manufacturer, direct taxable inputs, exempt-production inputs, factory-wide services and capital machinery require separate treatment. Capital-goods credit cannot simply be added to the Rule 42 pool, and earlier reversals cannot be ignored.

The Nitin Bakers order by Lucknow GSTAT dated 21.10.2026 is relevant & valuable because it sends the dispute back for proper verification and reconciliation. It is not a blanket exemption from reversal. Its practical value lies in reminding both the department and the taxpayer that a demand must be tested against the actual records and the correct statutory calculation.

A taxpayer should reverse what the law requires—but no more. An officer should recover what is legally due—but only after identifying the correct credit pool, applying the correct rule and giving credit for amounts already excluded, reversed or paid.