Demystifying Rule 42 of GST Valuation Rules

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Goods and Services Tax, also known as GST, is one of the most revolutionary and common taxation systems as of now. It is currently adopted by around 175 countries. This enormous number is surprising, right? However, it would not be if you are aware of its numerous advantages and scope for diversity.

Take India as an example. It replaced numerous indirect taxes and is dynamically boosting the country’s revenue. Moreover, it has also eliminated numerous taxation complexities for business owners. However, due to the complex nature of GST in India, some of its rules, like Rule 42 of GST Valuation, can be difficult to comprehend. 

If you are looking for an in-depth GST Rule 42 explanation, read this article below till the end. It will also give you some key considerations to keep in mind.

Understanding GST Rule 42 in Detail

Valuation under GST Rule 42 plays a crucial role in determining and reversing the Input Tax Credit (ITC) for businesses registered under the GST framework in India. Its primary purpose is to establish the quantum of ITC available for offsetting against tax liabilities on taxable supplies. Some of its key concepts are as follows:

  • Input Tax Credit (ITC)

Input Tax Credit (ITC) is a vital aspect of the Goods and Services Tax (GST) system, representing the tax amount paid on goods and services purchases. This credit allows businesses to offset these amounts against their sales tax liabilities.

  • Taxable and Exempt Supplies

Within the GST framework, supplies are categorized into taxable and exempt. Taxable Supplies include goods and services subject to GST, contributing to overall tax revenue. Exempt Supplies, however, are not subject to GST, and businesses dealing with such items do not charge GST on transactions. The classification of supplies into these categories is crucial for determining Input Tax Credit eligibility and calculations.

  • Non-business Purposes

Non-business purposes involve using goods and services for personal consumption or unrelated activities. Recognizing non-business usage is essential as it influences Input Tax Credit determination and reversal under specific scenarios, as outlined in GST Rule 42. Understanding these concepts is fundamental for effective GST compliance and ensuring a fair and efficient taxation system.

Applicability of GST Rule 42

The applicability of Valuation under GST Rule 42 extends to all registered businesses under the Indian GST regime. Here are some specific situations where the rule applies:

  • Determining available ITC for taxable supplies

All registered businesses can use Rule 42 to calculate the amount of ITC available for offsetting tax liability on their taxable supplies. This involves excluding ITC related to non-business purposes, exempt supplies, and capital goods (covered by Rule 43) from the total input tax paid.

  • Reversal scenarios

Some of the reversal situations are:

  • Non-payment of consideration within 180 days: If a business fails to pay a supplier’s invoice within 180 days from the date of issue, a portion of the corresponding ITC claimed needs to be reversed.
  • Change in use of goods/services: If goods or services initially procured for making taxable supplies are later used for exempt supplies or non-business purposes, the ITC claimed earlier needs to be reversed proportionately.
  • Cancellation of registration: When a business’s GST registration is cancelled, any remaining ITC needs to be reversed and paid back to the government.
  • Specific sectors/businesses

While applicable to all registered businesses, Rule 42 takes on particular significance in sectors dealing with:

  • Construction of apartments: The rule dictates how builders can claim and reverse ITC on inputs and services used for both booked and unbooked apartments.
  • Service providers: Businesses providing services covered under Schedule II of the GST Act (e.g., educational institutions, healthcare) have specific considerations for applying Rule 42.

It is important to note that the applicability of Rule 42 can vary based on the specific nature of a business’s activities and transactions. It is also advisable to consult with a skilled tax expert for an appropriate understanding and execution of the regulation in your unique circumstances.

Methodology and Calculation under Rule 42

Understanding the calculation methods in Rule 42 of GST valuation can be confusing. Therefore, to understand it easily, read the following steps:

Step 1: Segregation of Ineligible Credits from Total ITC

In the first step, businesses must identify and segregate specific ineligible credits for claiming. This involves breaking down the total input tax (T) into three components:

  • T1: Credit attributable to inputs/input services for non-business purposes.
  • T2: Credit attributable to inputs/input services exclusively for exempt supplies.
  • T3: Credit deemed ‘blocked credits’ under section 17(5).

These components (T1, T2, T3) are reported in GSTR 3B at a summary level for each tax head.

Step 2: Derivation of Common Credit

After segregating ineligible credits, the common credit (C1) is derived by subtracting T1, T2, and T3 from the total ITC. Specific credit (T4) on inputs/input services exclusively used for making taxable supplies is also identified. Common credit for taxable supplies (C2) is then calculated as C1 minus T4.

Step 3: Computation of Reversal Amounts

In this step, the amount of ITC to be reversed is computed. This involves three components:

  • D1: ITC attributable towards exempt supplies out of common credit, calculated as (E÷F) × C2. Here, E is the aggregate value of exempt supplies, and F is the total turnover in the State.
  • D2: Deemed ITC attributable for non-business purposes, calculated as 5% of C2.
  • C3: The remaining eligible ITC out of common credit is calculated as C2 minus (D1 + D2).


Let’s consider a different scenario for the month of November 2020, focusing on supplies made in Maharashtra:

Particulars  Amount (in Rs) 
Total ITC available (T)  2,00,000 
ITC on inputs for staff welfare (T1)  10,000 
ITC on inputs exclusively for export (T2)  25,000 
Blocked credits for utilities (T3)  8,000 
ITC on inputs used for manufacturing (T4)  1,40,000 
Aggregate value of exempt supplies in November (E)  3,00,000 
Total turnover in Maharashtra (F)  45,00,000 



  • Calculate C1

C1 = T – (T1+T2+T3)



  • Determine C2

C2 = C1 – T4

So, C2=C1−T4


  • Compute D1

D1 = (E÷F) × C2 



  • Calculate D2

D2 = 5% of C2 

So, D2= 850

  • Find C3

C3 = C2 – (D1 + D2) 

So, C3=17,000−(1,133.33+850)=15,016.67


In this new scenario, out of the initially available ITC of ₹2,00,000, only C3 (₹15,016.67) and T4 (₹1,40,000) are credited ultimately to the electronic credit ledger. D1 (₹1,133.33) and D2 (₹850) are required to be reversed, showcasing the practical application of Rule 42 in a different business context.

Compliance and Documentation of Rule 42 of GST Valuation

Rule 42 of the CGST, 2017, holds significant implications for the reversal of the ITC on inputs and input services used for specific purposes. A thorough understanding of compliance with GST Rule 42 and its documentation requirements is essential for businesses operating under the GST regime.

Compliance Guidelines:

  • Reversal Triggers

ITC reversal is mandatory in cases of non-payment of tax by the supplier if the invoice remains unpaid for 180 days from the date of issuance. Moreover, ITC must be reversed if inputs or input services are utilized for non-business purposes or for making exempt supplies (except notified goods).

  • Calculation Methodology

The amount of ITC to be reversed is determined through a specified formula, considering the total ITC claimed the portion used for non-business purposes, exempt supplies, and business purposes.

  • Declaration in Returns

Reversed ITC amounts must be accurately declared in the GSTR-3B return for the relevant tax period. Adherence to this declaration is critical for maintaining compliance.

  • Record Maintenance

Proper record-keeping is essential. Businesses must maintain records of all invoices, input tax credits claimed, and any reversal of ITC as per Rule 42. This includes details of attempts to recover unpaid taxes from suppliers.

Documentation Requirements:

  • Invoices

Keep comprehensive copies of all invoices on which ITC is claimed. Accurate documentation of invoices supports the legitimacy of the ITC claim.

  • Proof of Non-payment

In cases where ITC is reversed due to non-payment by the supplier, maintain tangible evidence of efforts to recover the tax. This may include communication records or legal notices sent to the supplier.

  • Records of Use

For ITC reversal related to non-business purposes or exempt supplies, maintain detailed records justifying the proportion of such use. This documentation helps substantiate compliance during audits.

  • GSTR-3B Returns

Ensure the precise declaration of reversed ITC in GSTR-3B returns. Consistent and accurate reporting in returns is a crucial aspect of GST compliance.

Key Considerations for Businesses for Rule 42 of GST Valuation

Here are some key considerations for businesses regarding Rule 42 of GST Valuation:

  • Impact on Cash Flow

Reversing ITC under Rule 42 affects cash flow, necessitating proactive management. Renegotiating payment terms with suppliers helps mitigate non-payment risks, aligning payment schedules to navigate Rule 42’s financial implications effectively.

  • Internal Processes and Controls

Robust internal controls are vital for Rule 42 compliance. Implement measures to monitor inventory, track input usage, and conduct staff training. Accurate tracking ensures a precise determination of ITC eligible for reversal.

  • Record Keeping and Documentation

Comprehensive record-keeping is crucial for Rule 42 compliance. Maintained detailed records and explored digital systems for streamlined documentation, enhancing overall efficiency and compliance.

  • Tax Planning and Optimization

Seek advice from tax advisors to navigate Rule 42 complexities. Understand its impact, explore exemptions, and explore alternative sourcing options. This strategic approach minimizes ITC reversal needs, optimizing the overall tax position.

  • Communication and Collaboration

Transparent communication with suppliers is vital. Promptly address outstanding tax liabilities to avoid ITC reversal, fostering a cooperative relationship. Internal collaboration ensures seamless Rule 42 compliance integration, reducing non-compliance risks.

  • Staying Updated

Proactive awareness is crucial for Rule 42 compliance. Stay updated on amendments and clarifications by tax authorities. Continuous learning prevents compliance errors, optimizing tax compliance strategy amid evolving regulations.


Understanding Rule 42 of GST Valuation Rules reveals its intricate nature and the significant impact it holds on businesses. Thus, the reversal of the Input Tax Credit (ITC) necessitates a strategic approach. Businesses face multifaceted challenges in complying with rule 42 of GST valuation. However, proactively addressing these considerations can enhance compliance, optimize tax positions, and promote resilience in an ever-evolving GST regime.

Frequently Asked Questions

Q1. What is Rule 40 in GST?

Rule 40 outlines the procedure for claiming credit in special circumstances. If the Commissioner of State Tax or the Commissioner of Union Territory Tax extends the time limit, such an extension will be considered officially notified by the Commissioner.

Q2. What is Rule 45 of CGST rules?

Rule 45 of the CGST Rules stipulates that when sending inputs, semi-finished goods, or capital goods for job work, including transfers between job workers, they must be accompanied by a challan issued by the principal.

Q3. What is the time limit for GST payment?

The GST payment due date is set at 20 days from the end of the month for regular taxpayers. However, for those registered under the composition scheme, the deadline is 18 days after the end of the quarter. 

Q4. What is rule 46 of the SGST rules?

As per Rule 46, for taxable supplies of services, the invoice must be issued within thirty days from the date of supplying the service.

Q5. What is the 180-day rule in GST?

As per CGST Rule 37, if a taxpayer fails to make payment to the supplier for an inward supply of goods or services for which input tax credit (ITC) has been claimed, they are required to reverse the ITC along with the payable interest within 180 days from the issuance date of the invoice.

Q6. Is GST paid monthly?

Yes, GST payment is a critical aspect of business compliance. According to guidelines, registered regular taxpayers are required to submit GST returns monthly and make the necessary tax payment by the due date, which falls on the 20th of each month.

Q7. Who can avoid GST registration?

If an individual is exclusively engaged in the 100% supply of goods that are not subject to GST, registration is not mandatory. “Not liable to tax,” as per section 23 of the CGST Act, encompasses supplies that are either nil rated or fall under abated value, signifying a lack of liability to tax under the CGST/SGST/IGST Act.

Q8. Can you file GST without CA?

Previously, businesses with turnovers of over ₹5 crore needed CA audit certification for GST returns. Now, CBIC allows self-certification, offering businesses flexibility with the option to have CAs file returns.

Q9. What is the GST TDS return?

GSTR-7 is a monthly return for those deducting tax at Source (TDS) under GST. Individuals deducting TDS must file this form by the 10th of the following month to ensure compliance with Goods and Services Tax regulations.

Q10. How to calculate GST?

To calculate GST, use the formula: GST Amount = (Original Cost * GST Rate Percentage) / 100. The Net Price is then obtained by adding the Original Cost and the calculated GST Amount.

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Shivam Sharma
Shivam Sharma is a penultimate-year BBALLB (Honours) student passionate about crafting insightful content in the finance niche. He remains well-informed through continuous engagement with the latest news, ensuring that his content reflects the most current and relevant insights. Shivam Sharma's unique strength lies in his comprehensive understanding of both the legal and business facets of various topics. This dual expertise allows him to present well-researched content, making him a valuable contributor in the field of business and finance content creation.

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