ITC Reversal Rules in GST: Rule 37A, 42, 43 — When You Must Reverse Input Tax Credit (2026)

What is ITC Reversal?

ITC reversal is the process of reducing or removing Input Tax Credit that was previously claimed in your GSTR-3B but is no longer eligible under certain conditions. ITC reversal is a regular compliance activity — it is not necessarily a penalty. In many cases, the reversed ITC can be reclaimed later when the condition is satisfied (e.g., when the supplier is paid).

ITC reversal is reported in Table 4B of GSTR-3B, which has several rows for different reversal categories. Failing to reverse ITC when required leads to interest under Section 50(3) at 24% per annum and potential demand notices under Section 73/74.

The key reversal rules are found in Rules 37, 37A, 42, and 43 of the CGST Rules, 2017. In this guide, we focus on the three most practically relevant rules: Rule 37A (non-payment to supplier), Rule 42 (common credit for exempt/taxable supplies), and Rule 43 (capital goods used for mixed purposes). We also cover other reversal scenarios under Section 17(5) and Section 18.

Rule 37 (Original) vs Rule 37A (New) — Non-Payment to Supplier

Rule 37 (original provision): If the recipient does not pay the supplier within 180 days from the invoice date, the ITC claimed on that invoice must be reversed along with interest at 24% per annum from the date ITC was availed to the date of reversal. Once payment is made, the ITC can be re-claimed (Table 4D).

Rule 37A (introduced via Notification 13/2024-CT): In addition to non-payment, if the supplier has not filed their GSTR-3B for the period to which the invoice belongs, the recipient must reverse the proportionate ITC. The rationale: if the supplier has not paid the tax to the government (which happens when GSTR-3B is not filed), the recipient should not get the corresponding ITC. Key points:

• The rule applies to all B2B invoices where the supplier has not filed GSTR-3B for the relevant period.
• The recipient must reverse the ITC attributable to such invoices in the month following the GSTR-3B due date.
• If the supplier files GSTR-3B later (even belatedly), the recipient can re-avail the ITC in the period of filing.
• GSTR-2B has a specific tab "ITC Reversal (Rule 37A)" that flags such invoices.

Example: Supplier A supplies goods worth ₹1,00,000 to Recipient B in January 2026. A files GSTR-1 but does not file GSTR-3B for January 2026 (due 20 Feb 2026). As of 21 Feb 2026, B must reverse the ITC related to A's invoice in the February 2026 GSTR-3B (Table 4B). If A files the January 2026 GSTR-3B in March 2026, B can re-avail the reversed ITC in the March 2026 GSTR-3B (Table 4D).

Rule 42 — Reversal of Common Credit for Exempt Supplies

When a business makes both taxable and exempt supplies, the ITC on inputs and input services that are common to both (e.g., rent, electricity, administrative expenses) must be reversed proportionately. Rule 42 provides the detailed formula:

Step 1 — Compute Common Credit (C): Total ITC on inputs and input services for the period (C).

Step 2 — Identify ITC exclusively for taxable supplies (T): ITC on inputs used wholly for taxable supplies — no reversal needed.

Step 3 — Identify ITC exclusively for exempt supplies (E): ITC on inputs used wholly for exempt supplies — must be fully reversed.

Step 4 — Compute remaining common credit (C2): C2 = C − (T + E)

Step 5 — Compute ITC attributable to exempt supplies (D1): D1 = C2 × (Exempt turnover ÷ Total turnover)

Step 6 — Compute ITC attributable to non-business/personal use (D2): D2 = 5% of C2 (deemed personal consumption — a standard floor)

Step 7 — Total reversal: Amount to reverse in GSTR-3B Table 4B = D1 + D2 + E

Example: A manufacturer makes taxable goods (turnover ₹80 lakh) and exempt goods (turnover ₹20 lakh). Common credit C2 = ₹10,00,000. D1 = ₹10,00,000 × (20/100) = ₹2,00,000. D2 = 5% of ₹10,00,000 = ₹50,000. Total reversal = ₹2,50,000. This is reversed in GSTR-3B Table 4B(1) and a year-end true-up is done in GSTR-9 Table 14.

Rule 43 — Reversal of ITC on Capital Goods Used for Exempt Supplies

Rule 43 governs ITC reversal on capital goods (machinery, equipment, computers, vehicles) that are used for both taxable and exempt supplies. The principle is different from Rule 42 because capital goods have a useful life spanning multiple years. Key points:

• ITC on capital goods is fully availed at the time of purchase, irrespective of use for exempt supplies.
• The reversal is done monthly at the rate of 1/60th of the total ITC on each capital good for every month it is used for exempt supplies (over a 5-year period = 60 months).
• If a capital good is used exclusively for taxable supplies, no reversal is needed.
• If used exclusively for exempt supplies, full ITC must be reversed upfront (but the 1/60th monthly method can still apply if the exemption is temporary).
• The reversal for a month = (Total ITC on the capital good ÷ 60) × Number of months used for exempt supplies in that period.

Example: A company buys a printing press for ₹6,00,000 with GST at 18%, so ITC availed = ₹1,08,000. The press is used 40% for taxable supplies and 60% for exempt supplies. In each month, the reversal = ₹1,08,000 ÷ 60 × 60% = ₹1,080. If the press is used for exempt supplies for 10 months in a year, the total annual reversal = ₹1,080 × 10 = ₹10,800.

Other ITC Reversal Scenarios

Beyond Rules 37A, 42, and 43, ITC must be reversed in several other situations:

Goods Lost, Stolen, Destroyed, Written Off

Under Section 17(5)(h), ITC on inputs that are lost, stolen, destroyed, written off, or disposed of as gifts or free samples must be reversed. The reversal is done in the period the loss is discovered. If the goods were insured and insurance proceeds are received, the ITC reversal amount is the proportion of the loss not covered by insurance.

Free Samples and Gifts

ITC on goods given away as free samples or gifts is blocked under Section 17(5)(h). The entire ITC must be reversed. Many businesses miss this at year-end — distributing Diwali gifts or promotional samples without reversing ITC is a common finding in audits.

Personal Use

If goods or services are used for personal consumption (not for business purposes), the ITC is blocked under Section 17(5)(g). Proprietors often purchase items in the business name but use them personally — ITC on such purchases must be reversed.

Work-in-Progress (WIP) and Finished Goods Exempted

If a manufacturer switches from taxable to exempt production for a certain product line, ITC on the corresponding WIP and finished goods held in stock must be reversed as per Section 18(4) read with Rule 44.

Registration Cancellation

When a GST registration is cancelled, ITC on closing stock (inputs, WIP, finished goods) and capital goods must be reversed through FORM GST ITC-03. The reversal is calculated on a pro-rata basis.

Switching from Regular to Composition Scheme

When a regular taxpayer opts for the composition scheme, ITC on stock held on the date of switch must be reversed via ITC-03. Composition dealers cannot claim ITC, so all previously availed ITC on unsold stock must go.

Reporting Reversals in GSTR-3B Table 4

Table 4 of GSTR-3B has specific rows for reversals. The structure is:

• Table 4B(1): ITC reversed for inputs (Rule 42 — proportional reversal for exempt supply common credit)
• Table 4B(2): ITC reversed for inputs (Rule 37 — non-payment to supplier within 180 days)
• Table 4B(3): Reversal of ITC on capital goods (Rule 43)
• Table 4B(4): Other reversals (Section 17(5) blocked credits, goods lost, free samples, etc.)
• Table 4D: ITC re-claimed after reversal (Rule 37/37A — when payment is made or supplier files GSTR-3B)

The portal auto-populates some values (especially Rule 37A flagged invoices from GSTR-2B), but the taxpayer is responsible for computing Rule 42 and Rule 43 reversals and entering them correctly.

Interest on Late Reversal — Section 50(3)

If ITC reversal is delayed beyond the prescribed time, interest at 24% per annum is payable under Section 50(3) from the date the reversal was due to the date of actual reversal. This is significantly higher than the standard 18% interest on late payment of output tax. The law treats wrongfully retained ITC as a serious violation.

Year-End True-Up in GSTR-9 Table 14

The monthly reversals under Rule 42 and Rule 43 are provisional. At the end of the financial year, the taxpayer must compute the final reversal for the full year based on actual exempt/taxable turnover. Any excess or shortfall in the monthly reversals is adjusted in GSTR-9 Table 14. This is one of the most commonly audited areas in annual return scrutiny — a difference of even 1% in the estimate can lead to notices.

Common ITC Reversal Mistakes

• Not reversing for non-payment to supplier: Many small business owners miss the 180-day rule. If the supplier is unpaid at 180 days, the ITC must be reversed immediately — not when the supplier finally files their return.
• Not monitoring Rule 37A in GSTR-2B: The portal flags invoices where the supplier has not filed GSTR-3B. Ignoring these flags is a common mistake leading to demands.
• Using wrong turnover for Rule 42: The Rule 42 formula uses total turnover (including exempt, nil-rated, and zero-rated), not just taxable turnover. Excluding zero-rated supplies (exports) from the denominator understates the reversal.
• Forgetting D2 (5% of common credit): The 5% deemed personal use component is mandatory — you cannot skip it even if no goods are actually used for personal purposes.
• Not reversing free samples and gifts: This is the single most common mistake found in GST audits. Distributing free samples, Diwali gifts, or promotional items without reversing ITC is a violation of Section 17(5)(h).
• Confusing capital goods reversal with input reversal: Rule 43 (capital goods) uses 1/60th per month. Rule 42 (inputs) uses the turnover-based formula. They are separate computations.

Practice ITC Reversal on IndIaTaxSim

IndIaTaxSim simulates the complete ITC reversal workflow — receiving a supplier invoice flagged for Rule 37A (non-filing by supplier), reversing the ITC in GSTR-3B Table 4B(2), and re-availing it when the supplier files. The simulation also lets you practice Rule 42 and Rule 43 computations with sample data and report them correctly in GSTR-3B and GSTR-9 Table 14. Explore ITC study notes →

Disclaimer

ITC reversal rules are governed by the CGST Rules, 2017, and amendments thereunder. The examples and computations provided are for educational illustration. Always consult the current Rules and CBIC circulars for live compliance. IndIaTaxSim is not a substitute for professional tax advice.