GST ITC Apportionment under Rule 42 & Rule 43: Common Credit Reversals, Capital Goods & True-Up Guide

1. Executive Overview & The Fiscal Mandate of ITC Apportionment

The Input Tax Credit (ITC) mechanism is the central circulatory system of the Goods and Services Tax (GST) framework in India, designed to eliminate the cascading taxation of goods and services. However, the fundamental principle underpinning value-added taxation dictates that tax credit is permissible only when the inward procurement is directly or indirectly utilized in making taxable supplies (including zero-rated exports). Where an enterprise utilizes goods or services partly for business purposes and partly for other purposes, or partly for effecting taxable supplies and partly for effecting exempt supplies, the statutory entitlement to input tax credit must be strictly apportioned.

This statutory discipline is codified in Section 17(1) and Section 17(2) of the Central Goods and Services Tax (CGST) Act, 2017. To give operational effect to this statutory mandate, the Central Government prescribed detailed mathematical apportionment algorithms: Rule 42 of the CGST Rules, 2017 (governing inputs and input services), and Rule 43 (governing capital goods). These rules require businesses with mixed supply streams—such as pharmaceutical companies manufacturing both taxable and exempt medicines, real estate developers constructing residential complexes, educational trusts, and banks—to calculate monthly reversals of common input tax credits and execute a mandatory Annual True-Up re-computation under Rule 42(2) on or before November 30 following the end of each financial year.

Managing Rule 42 and Rule 43 compliance is one of the most error-prone areas in indirect tax administration. Under-reversals attract retrospective interest at 18% per annum under Section 50(1), while over-reversals result in permanent cash flow leakage if not reclaimed within statutory limitation windows. Furthermore, the definition of "exempt supply" under Section 17(3) incorporates complex deemed items—including sale of land, completed buildings, and 1% of the value of securities traded. Deploying enterprise reconciliation engines like assureTax and financial ledger integration software like assureFinancials is essential for tax controllers to automate multi-variable credit apportionment and eliminate exposure during departmental audits under Section 65.

2. Statutory Architecture: Section 17(1), 17(2) & 17(3) Expanded Scope

To execute accurate apportionment, practitioners must analyze the statutory boundary conditions established by Section 17 of the CGST Act:

Statutory Provision	Legal Scope & Core Requirement	Apportionment Rule & Method
Section 17(1)	Goods or services used partly for the purpose of any business and partly for other purposes (personal use, non-business charity).	Credit restricted to so much of input tax as is attributable to the purposes of business. Governed by 5% deemed non-business reversal (variable D2) under Rule 42.
Section 17(2)	Goods or services used partly for effecting taxable supplies including zero-rated supplies and partly for effecting exempt supplies.	Credit restricted strictly to taxable and zero-rated supplies. Ineligible credit calculated in proportion to exempt turnover (variable D1) under Rule 42 and Te under Rule 43.
Section 17(3)	Defines the expanded scope of "Exempt Supply" for the specific purpose of ITC apportionment.	Includes: (a) Supplies taxable under Reverse Charge Mechanism (RCM); (b) Transactions in securities (valued at 1% of sale value); (c) Sale of land; and (d) Sale of building post completion certificate.
Section 17(4)	Special optional regime for Banking Companies and Financial Institutions (including NBFCs).	Option to reverse flat 50% of eligible input tax credit availed on inputs, capital goods, and input services every month, bypassing Rule 42/43 formulas.
Rule 42(2)	Mandatory Annual True-Up Re-computation for inputs and input services across the entire financial year.	Must be completed on or before the due date for filing return for November following the end of FY. Differential shortfall payable with interest under Section 50(1).
Rule 43(1)	Apportionment of credit on Capital Goods over a statutory useful life of 60 months (5 years).	Monthly allocation formula: Tm = Tc / 60. Ineligible monthly portion reversed based on exempt turnover ratio.

3. Deep-Dive Technical Mechanics: Rule 42 & Rule 43 Mathematical Formulas

3.1 The Rule 42 Step-by-Step Mathematical Workflow

Under Rule 42(1), the monthly apportionment of Input Tax Credit on inputs and input services follows a strict algebraic elimination sequence:

1. Step 1: Determine Total Input Tax (T)
   Total input tax involved on all inputs and input services procured in the tax period (as per auto-populated GSTR-2B).
2. Step 2: Segregate Exclusively Ineligible Credits (T1, T2, T3)
   • T1: Input tax exclusively attributable to non-business purposes (e.g., procurement for personal consumption of directors).
   • T2: Input tax exclusively attributable to exempt supplies (e.g., raw packaging used 100% for exempt generic medicines).
   • T3: Input tax on goods or services blocked under Section 17(5) (e.g., motor vehicle insurance, food catering, works contract for immovable property).
3. Step 3: Calculate Credit to Electronic Credit Ledger (C1)
   C1 = T − (T1 + T2 + T3). The amount C1 is credited to the Electronic Credit Ledger in Table 4(A) of Form GSTR-3B.
4. Step 4: Identify Exclusively Taxable Credit (T4)
   Input tax exclusively attributable to making taxable supplies (including zero-rated export supplies).
5. Step 5: Isolate Common Credit (C2)
   C2 = C1 − T4. This represents the common credit pool utilized for both taxable and exempt supplies, which must be apportioned.
6. Step 6: Compute Ineligible Credit for Exempt Supplies (D1)
   

   D1 = (E ÷ F) × C2

   Where:
   • E = Aggregate value of exempt supplies during the tax period.
   • F = Total turnover in the State of the registered person during the tax period.
7. Step 7: Compute Ineligible Credit for Non-Business Use (D2)
   D2 = 5% of C2 (Statutorily deemed 5% reversal for non-business use of common assets/services).
8. Step 8: Determine Net Eligible Common Credit (C3)
   C3 = C2 − (D1 + D2). The amounts D1 and D2 are mandatorily reversed in Table 4(B)(1) of Form GSTR-3B.

3.2 The Mandatory Annual True-Up under Rule 42(2)

Monthly Rule 42 reversals are fundamentally provisional because monthly turnover fluctuations distort credit apportionment. Rule 42(2) mandates that the taxpayer shall finally determine the input tax credit for the entire financial year before the due date for furnishing the return for the month of November following the end of the financial year (or filing of annual return, whichever is earlier).

The annual true-up computes D1_annual = (Total Annual Exempt Turnover / Total Annual Turnover) × Total Annual Common Credit. The resulting variance is handled as follows:

• Short-Reversal Scenario (Annual D1 > Aggregate Monthly Reversals): The differential amount must be reversed in Form GSTR-3B filed for any month up to November. Crucially, the taxpayer must pay interest at 18% per annum under Section 50(1) on the differential amount calculated from the 1st day of April of the succeeding financial year till the date of payment!
• Excess-Reversal Scenario (Annual D1 < Aggregate Monthly Reversals): The excess credit reversed during the year may be reclaimed as eligible credit in Table 4(A)(5) of Form GSTR-3B on or before November 30. If the taxpayer misses the November 30 statutory deadline, the excess reversed credit lapses permanently.

3.3 The Rule 43 Capital Goods Apportionment Algorithm

Capital goods (such as manufacturing machinery, commercial vehicles, and computer servers) provide economic benefits over multiple years. Rule 43(1) establishes an amortization model based on a statutory useful life of 60 months (5 years) from the date of the invoice:

1. Exclusively Ineligible Capital Goods: Capital goods used exclusively for non-business purposes or exempt supplies are barred from credit; zero credit is taken in GSTR-3B.
2. Exclusively Taxable Capital Goods: Capital goods used exclusively for taxable/zero-rated supplies are 100% eligible; full credit is availed in GSTR-3B.
3. Common Capital Goods (Tc): Capital goods used commonly for both taxable and exempt supplies are credited to the Electronic Credit Ledger in full in the month of purchase.
4. Monthly Useful Life Amortization (Tm): The monthly credit for common capital goods is computed as: Tm = Tc / 60.
5. Monthly Common Capital Credit Pool (Tr): Aggregate of all Tm values for all common capital goods whose 60-month useful life remains unexpired.
6. Monthly Ineligible Capital Credit (Te):
   

   Te = (E ÷ F) × Tr

   The amount Te is added to the output tax liability (or reversed in Table 4(B)(1)) every month for 60 consecutive months.
7. Transition from Taxable to Common Use (5% Reduction Rule): If a capital asset previously used exclusively for taxable supplies is subsequently used for exempt supplies, credit is availed by reducing 5 percentage points for every quarter or part thereof from the date of invoice.

4. Practical Examples, Case Studies & Numerical Illustrations

The following real-world case studies illustrate the exact mathematical computations, ledger entries, and audit defense strategies under Rules 42 and 43.

Case Study 1: Pharmaceutical Manufacturer with Monthly Rule 42 Apportionment

Context & Monthly Financials: M/s Apex BioPharma Ltd manufactures generic medicines in Baddi, Himachal Pradesh. In August 2024, its operations reflect:

• Turnover of Taxable Formulations (taxed @ 12%): ₹8,00,00,000
• Turnover of Exempt Life-Saving Drugs (Notification 12/2017): ₹2,00,00,000
• Total Turnover in the State (F): ₹10,00,00,000; Exempt Turnover (E): ₹2,00,00,000 (Exempt Ratio: 20%)
• Total Inward Input Tax Credit on Inputs and Input Services (T): ₹45,00,000
• T1 (Exclusively non-business procurement): ₹50,000
• T2 (Exclusively exempt packaging foil): ₹4,50,000
• T3 (Blocked credit u/s 17(5) - Factory employee health insurance): ₹2,00,000
• T4 (Exclusively taxable API raw chemicals): ₹26,00,000

Step-by-Step Rule 42 Calculation:

1. Credit to Electronic Credit Ledger (C1):
   C1 = T − (T1 + T2 + T3) = ₹45,00,000 − (₹50,000 + ₹4,50,000 + ₹2,00,000) = ₹38,00,000 credited in Table 4(A).
2. Common Credit Pool (C2):
   C2 = C1 − T4 = ₹38,00,000 − ₹26,00,000 = ₹12,00,000.
3. Ineligible Credit Attributable to Exempt Supplies (D1):
   D1 = (E / F) × C2 = (₹2,00,00,000 / ₹10,00,00,000) × ₹12,00,000 = ₹2,40,000.
4. Ineligible Credit for Non-Business Use (D2):
   D2 = 5% of C2 = 5% × ₹12,00,000 = ₹60,000.
5. Total Ineligible Reversal in GSTR-3B Table 4(B)(1):
   D1 + D2 = ₹2,40,000 + ₹60,000 = ₹3,00,000.
6. Net Eligible Common Credit retained (C3):
   C3 = C2 − (D1 + D2) = ₹12,00,000 − ₹3,00,000 = ₹9,00,000.
7. Total Net ITC enjoyed for August 2024: T4 (₹26,00,000) + C3 (₹9,00,000) = ₹35,00,000. Automating this monthly routine via assureTax eliminates calculation errors.

Case Study 2: Annual Rule 42(2) True-Up Revealing Shortfall & Section 50(1) Interest

Context & Full-Year Reconciliation: For FY 2023-24, M/s Horizon Foods Ltd executed monthly Rule 42 reversals totaling ₹18,00,000 across April 2023 to March 2024. In October 2024, the company finalizes its statutory audit and executes the mandatory annual true-up under Rule 42(2):

• Full-Year Total Turnover (F_annual): ₹120,00,00,000
• Full-Year Exempt Turnover (E_annual): ₹36,00,00,000 (Exempt Ratio: 30%)
• Full-Year Total Common Credit (C2_annual): ₹76,00,00,000 / 10 = ₹76,00,000
• Annual Ineligible Credit (D1_annual):
  (₹36 Cr / ₹120 Cr) × ₹76,00,000 = 30% × ₹76,00,000 = ₹22,80,000.

True-Up Variance & Interest Computation:

1. Annual True-Up Reversal Required: ₹22,80,00,0? No, ₹22,80,000
2. Aggregate Monthly Reversals already made: ₹18,00,000
3. Net Shortfall Payable: ₹22,80,000 − ₹18,00,000 = ₹4,80,000
4. Mandatory Interest under Section 50(1):
   • Under Rule 42(2), interest is payable from April 1, 2024, till the date of payment in GSTR-3B.
   • If paid in GSTR-3B for October 2024 filed on November 15, 2024 (229 days delay):
   • Interest @ 18% p.a. = ₹4,80,00,0? No, ₹4,80,000 × 18% × (229 / 366) = ₹54,059.
5. The company deposits ₹4,80,000 tax plus ₹54,059 interest in Form GSTR-3B for October 2024. Failure to pay interest triggers automated DRC-01 notices during audit. Reconciling annual true-ups in assureTax prevents interest compounding.

Case Study 3: Capital Goods (Machine) 60-Month Useful Life Amortization under Rule 43

Context & Facts: On July 1, 2024, M/s Precision Engineering buys a CNC cutting machine for ₹1,20,00,000 plus 18% IGST (₹21,60,000) used commonly for manufacturing taxable auto-parts and exempt defense components.

Rule 43 Monthly Amortization Schedule:

• Capital Goods Input Tax (Tc): ₹21,60,000 credited to Electronic Credit Ledger in full in July 2024.
• Statutory Useful Life: 60 months.
• Monthly Value (Tm): Tc / 60 = ₹21,60,000 / 60 = ₹36,000 per month.
• In September 2024, Total Turnover (F) = ₹5,00,00,000; Exempt Turnover (E) = ₹1,25,00,000 (Exempt Ratio: 25%).
• Monthly Ineligible Reversal (Te):
  Te = (E / F) × Tm = 25% × ₹36,000 = ₹9,000.
• The company must reverse ₹9,000 in Table 4(B)(1) of GSTR-3B for September 2024. This monthly calculation continues for 60 consecutive months. Managing 60-month capital asset tracking in assureFinancials ensures zero default across asset lifecycles.

Case Study 4: Real Estate Developer Construction with Commercial & Residential Units

Context & Facts: Urban Builders constructs a mixed-use commercial and residential project in Gurgaon. Commercial shops are taxable at 12% with ITC. Residential apartments are taxable at 5% (affordable housing at 1%) without ITC. Total common ITC on steel, cement, and engineering services incurred during construction is ₹2,50,00,000.

Specialized Real Estate Apportionment under Rule 42:

• Residential apartments where ITC is barred are treated as "exempt supplies" for Rule 42 apportionment.
• Apportionment is based on the Carpet Area Ratio:
  • Total Carpet Area of Project: 1,00,000 sq meters
  • Carpet Area of Residential Units (Exempt): 70,000 sq meters (70%)
  • Carpet Area of Commercial Units (Taxable): 30,00,0? No, 30,000 sq meters (30%)
• Ineligible Common ITC under Rule 42 = 70% of ₹2,50,00,000 = ₹1,75,00,000 reversed.
• Eligible ITC retained for commercial units = 30% of ₹2,50,00,000 = ₹75,00,000. Real estate carpet area schedules are maintained in assurePractice.

Case Study 5: Trading in Shares & Inclusion of 1% Securities Value in Exempt Turnover

Context & Facts: An industrial trading firm has commercial product sales of ₹50 Crore. During the year, its treasury division sells listed equity shares for ₹10 Crore (purchase cost ₹8 Crore, net capital gain ₹2 Crore). Common overhead ITC on corporate office rent and legal fees is ₹20,00,000.

Explanation to Section 17(3) & Rule 45 Valuation:

• Under Explanation to Section 17(3), the value of exempt supply shall include the value of transactions in securities.
• Under Rule 45 / Explanation to Chapter V, the value of securities for the purpose of Section 17(3) is calculated as one per cent (1%) of the sale value of such securities.
• Exempt Value of Securities (E_sec) = 1% of ₹10,00,00,000 = ₹10,00,000 (NOT the ₹10 Cr sale price or ₹2 Cr profit!).
• Total Exempt Turnover (E) = ₹10,00,000. Total Turnover (F) = ₹50,00,00,000 + ₹10,00,000 = ₹50,10,00,000.
• Ineligible Reversal = (₹10,00,000 / ₹50,10,00,000) × ₹20,00,000 = ₹3,992. Misinterpreting the 1% valuation rule by taking gross share sales causes catastrophic over-reversal. Treasury modeling in assureTax prevents these valuation blunders.

Case Study 6: Machine Transitioning from Exclusively Taxable to Common Use (5% Reduction)

Context & Facts: On April 1, 2023, M/s Dynamic Polymers purchased an injection molding machine for ₹50,00,000 plus ₹9,00,000 GST, used exclusively for manufacturing taxable plastic containers (full ITC claimed). On October 1, 2024 (6 quarters later), the machine is shifted to manufacture exempt medical vials as well as taxable containers (transition to common use).

Rule 43(1)(c) 5% Reduction Rule:

• Elapsed time: 6 full quarters.
• Reduction = 5% × 6 quarters = 30%.
• Ineligible portion of original credit = 30% of ₹9,00,000 = ₹2,70,000.
• The company must add ₹2,70,000 to its output tax liability in October 2024.
• The remaining balance of ₹6,30,000 is amortized over the remaining 42 months (60 − 18 months) under Rule 43.

Case Study 7: Audit SCN for Omitted Annual Rule 42(2) True-Up

Context & Facts: During a Section 65 departmental audit of M/s Green Agro, the audit officer observes that the company performed monthly Rule 42 reversals in FY 2022-23 but never computed the annual true-up before November 30, 2023. The officer issues Form GST ADT-02 demanding recovery of the entire common credit of ₹45,00,000 with 100% penalty under Section 74.

Litigation Strategy & Defense:

• Demonstrate that failure to file a formal true-up calculation is a procedural lapse, not an intentional suppression of facts.
• Compute the retrospective annual true-up using audited balance sheet numbers: the annual true-up shows an under-reversal of only ₹1,40,000.
• Pay ₹1,40,000 plus interest under Section 50 via Form GST DRC-03.
• The Adjudicating Authority drops the proposed demand of ₹45,00,000 and waives penalties under Section 73. Managing audit defense through assureNotice protects against inflated tax demands.

5. 10-Step Practitioner Audit Verification Program for Rule 42 & 43 Compliance

Tax controllers, statutory auditors, and indirect tax consultants should execute this 10-step audit program across every registered GSTIN:

Step #	Audit Phase	Detailed Verification Action & Evidentiary Documents	Statutory Reference
Step 1	Turnover Classification & Stream Mapping	Extract revenue ledgers. Classify outward supplies into taxable, zero-rated exports, nil-rated, non-GST, and exempt supplies.	Section 2(47) & Section 17(2)
Step 2	Exempt Supply Inclusions Audit	Verify statutory inclusions under Section 17(3): outward RCM supplies, 1% value of securities, sale of land, and completed buildings.	Section 17(3) & Rule 45
Step 3	Inward Register Cleansing (T1, T2, T3)	Segregate inward tax invoices into: T1 (non-business), T2 (exclusively exempt), and T3 (blocked under Section 17(5)).	Rule 42(1)(a) to (c)
Step 4	Exclusively Taxable Credit Isolation (T4)	Identify inward goods/services dedicated exclusively to taxable products and export supplies. Confirm full credit eligibility.	Rule 42(1)(d)
Step 5	Common Credit (C2) Pool Calculation	Calculate common credit pool: C2 = C1 − T4. Ensure accurate population in monthly internal computation sheets.	Rule 42(1)(e) & (f)
Step 6	Monthly D1 & D2 Reversal Execution	Compute D1 = (E / F) × C2 and D2 = 5% × C2. Verify reporting in Table 4(B)(1) of monthly Form GSTR-3B.	Rule 42(1)(i) & (j)
Step 7	Rule 43 Capital Goods 60-Month Tracking	Maintain capital asset register tracking each machine over 60 months. Verify monthly Te reversal in GSTR-3B.	Rule 43(1)
Step 8	Mandatory Annual True-Up Execution	Compute full-year annual Rule 42(2) true-up using audited balance sheet figures on or before November 30.	Rule 42(2)
Step 9	Interest Calculation on Shortfall	If annual true-up reveals a short-reversal, calculate 18% interest under Section 50(1) from April 1 till payment date. Pay via DRC-03/GSTR-3B.	Rule 42(2)(a) & Section 50(1)
Step 10	GSTR-9 & GSTR-9C Annual Alignment	Reconcile monthly and annual reversals with Table 7 of Form GSTR-9 and auditor certification in Form GSTR-9C.	Section 44 & Form GSTR-9C

6. Elevating Indirect Tax Governance with the AssureOffice Suite

Managing high-volume transactional ITC allocations, maintaining 60-month capital goods depreciation schedules, and executing annual true-ups requires integrated tax technology:

• assureTax: Houses a dedicated Rule 42 & Rule 43 Apportionment Engine. Automatically categorizes GSTR-2B invoices into T1, T2, T3, and T4, computes monthly D1 and D2 reversals, tracks 60-month useful life for common capital assets, models 1% securities valuations, and executes automated annual true-ups with exact Section 50 interest calculations.
• assureFinancials: Provides automated trial balance grouping, aligns general ledger expense codes with GST return tables, and tracks deferred input tax credit assets in ERP balance sheets.
• assureNotice: Organizes corporate audit submissions, monitors Form GST ASMT-10 scrutiny notices questioning ITC apportionment, and drafts automated legal responses citing High Court and Tribunal jurisprudence.
• assurePractice: Empowers chartered accountancy firms to manage client GST compliance calendars, monitor the November 30 annual true-up deadline, and generate certified GSTR-9C reconciliation working papers.

7. Comprehensive Practitioner FAQs on Rule 42 & Rule 43 ITC Apportionment

Q1: Can an enterprise choose not to reverse common credit under Rule 42 if exempt turnover is very small?

No. Section 17(2) and Rule 42 establish a mandatory statutory requirement. Even if exempt turnover represents less than 1% of total turnover, proportional reversal of common credit is legally required. Failure to reverse attracts audit demands with interest and penalty.

Q2: What is the last date to complete the annual Rule 42(2) true-up re-computation?

The annual true-up must be completed and reflected in the return for the month of November following the end of the financial year (typically filed by November 20/22/24), or the date of filing the annual return, whichever is earlier.

Q3: Is interest payable if the annual true-up reveals that the taxpayer under-reversed credit during the year?

Yes. Under Rule 42(2)(a), the differential shortfall must be paid along with interest at the rate of 18% per annum under Section 50(1) calculated from the 1st day of April of the succeeding financial year till the date of payment.

Q4: What happens if the annual true-up shows that the taxpayer over-reversed credit during the year?

Under Rule 42(2)(b), the excess credit reversed may be claimed as eligible input tax credit in Form GSTR-3B on or before November 30. If not claimed within this deadline, the excess reversed credit lapses permanently.

Q5: How is the sale of listed equity shares valued for the purpose of exempt turnover under Section 17(3)?

Under Explanation to Section 17(3) read with Rule 45, the value of transactions in securities is taken as one per cent (1%) of the sale value of such securities, NOT the gross transaction value or capital gain.

Q6: Does interest received on bank fixed deposits or loans count as exempt turnover for Rule 42?

No. Under Notification No. 03/2019-Central Tax, services by way of extending deposits, loans, or advances where consideration is represented by interest or discount are specifically excluded from the value of exempt turnover for Rule 42 and Rule 43 calculations (except in the case of banking companies).

Q7: Can a banking company opt for Rule 42 instead of the flat 50% reversal under Section 17(4)?

Yes. Section 17(4) gives banking companies and NBFCs an option either to comply with Rule 42/43 or to reverse a flat 50% of eligible input tax credit every month. However, once chosen, the option cannot be varied during the remainder of the financial year.

Q8: Are capital goods used for both taxable and exempt supplies reversed over 3 years or 5 years?

Under Rule 43(1), the useful life of capital goods is statutorily fixed at 60 months (5 years) from the date of the invoice.

Q9: How is the reversal for capital goods computed when an asset is used for less than a full month?

Monthly depreciation and common credit allocation under Rule 43 is calculated on a full-month basis (Tm = Tc / 60) for any month in which the asset was operational.

Q10: Are subsidies received from the Government considered exempt supplies under Section 17(2)?

Central or State Government subsidies directly linked to the price of goods or services are excluded from value under Section 15(2)(e). Pure financial grants or general subsidies that do not constitute consideration for any supply are outside the scope of supply and do not trigger Rule 42 reversals.

Q11: Does export of goods or services under Letter of Undertaking (LUT) trigger Rule 42 reversal?

No. Section 17(2) specifically provides that credit is restricted to supplies effecting taxable supplies including zero-rated supplies. Zero-rated exports (with or without payment of tax) are treated on par with taxable supplies, and zero reversal is required.

Q12: Where should Rule 42 reversals be reported in Form GSTR-3B?

Monthly Rule 42 reversals (D1 + D2) and Rule 43 reversals (Te) must be reported in Table 4(B)(1) [As per rules 38, 42 & 43 of CGST Rules and section 17(5)] of Form GSTR-3B.

Q13: What is the consequence of not making Rule 42 reversals in GSTR-3B and only adjusting in GSTR-9?

Delaying reversals until GSTR-9 filing increases interest liability under Section 50(1) at 18% p.a., running continuously until the date of payment via Form GST DRC-03.

Q14: Does sale of land trigger Rule 42 reversal?

Yes. Under Section 17(3) read with Schedule III Entry 5, the value of sale of land (and completed buildings post-completion certificate) must be included in the value of "exempt supply" for the purpose of Rule 42 and 43 apportionment.

Q15: How is the 5% non-business reversal (D2) calculated?

D2 is calculated as a flat 5% of the common credit pool (C2): D2 = 5% × C2, representing deemed non-business use of shared enterprise resources.

Q16: How does assureTax automate Rule 42 and Rule 43 compliance?

assureTax automatically extracts multi-rate inward purchase registers, classifies inputs vs capital goods, tracks 60-month capital asset lifecycles, applies the 1% securities valuation rule, automates monthly D1 and D2 reversals, and computes the annual November 30 true-up with exact Section 50 interest calculations.