Section 18: ITC

Section 18: ITC on Stock, Reversals, and Business Transfers Under the CGST Act

Section 18 of the Central Goods and Services Tax (CGST) Act, 2017 governs one narrow but consequential question: what happens to Input Tax Credit (ITC) when a business's GST status changes? Whether you are registering for the first time, migrating out of the composition scheme, switching from exempt to taxable supplies, or transferring a business through merger, Section 18 determines whether lakhs of rupees of embedded tax credit are available in your electronic credit ledger — or are permanently lost. In FY 2026-27, with more businesses oscillating between composition and regular status and NCLT-driven restructurings accelerating, getting Section 18 right is a cash-flow decision, not just a compliance checkbox.

The Four Doors Into ITC Under Section 18(1)

Section 18(1) creates four distinct entry points at which a person becomes entitled to ITC on stock held immediately before the status change. Each has a different scope of eligible assets.

18(1)(a): Fresh GST Registration

A person who applies for GST registration and is granted registration may claim ITC on:

• Inputs held in stock on the day immediately preceding the date of grant of registration
• Inputs contained in semi-finished goods on that day
• Inputs contained in finished goods on that day

This provision covers businesses that were previously below the threshold turnover and are now crossing it. You are not entitled to ITC on capital goods under this sub-section. Only input-level embedded tax is recoverable.

18(1)(b): Voluntary Registration

A person who takes voluntary registration under Section 25(3) can claim ITC on:

• Inputs held in stock on the day immediately preceding the effective date of registration

The scope is narrower than 18(1)(a) — no semi-finished goods, no finished goods, only raw inputs. The logic is that voluntary registrants are electing into the system and receive correspondingly limited relief.

18(1)(c): Composition to Regular — The Most Valuable Door

When a composition taxpayer — one paying tax under Section 10 at a flat rate — switches to the regular scheme, either voluntarily or because their turnover breaches the composition threshold, they can claim ITC on:

• Inputs held in stock
• Inputs in semi-finished goods
• Inputs in finished goods
• Capital goods (subject to a reduction for the period of use, calculated under Rule 40)

This is the most commercially significant scenario. Businesses sitting on substantial inventory and machinery can recover significant blocked credit the moment they regularise. The capital goods component follows a five-year useful life formula explained below.

18(1)(d): Exempt Supplies Becoming Taxable

Where a registered person making exempt supplies finds that those supplies subsequently become taxable — because a notification withdraws the exemption or the nature of supply changes — they can claim ITC on:

• Inputs in stock used for such supplies
• Capital goods exclusively used for such supplies

The effective date is the day immediately preceding the date of the supply becoming taxable. This provision is triggered by external events (notification changes) rather than taxpayer elections, so the obligation to identify and claim the credit can easily be missed during routine compliance.

Form ITC-01: Filing the Claim Within 30 Days

All four scenarios above require the taxpayer to file Form ITC-01 on the GST portal. The statutory deadline is 30 days from the date of becoming eligible to claim ITC — meaning 30 days from registration grant, regularisation, or the date of the relevant notification.

This 30-day window is a hard cut-off. Unlike most ITC deadlines where a late GSTR-3B filing can still carry forward the credit, a missed ITC-01 deadline means the credit is gone permanently. There is no provision for condonation of delay under Section 18.

What Goes Into Form ITC-01

The form requires invoice-level disclosure:

1. Supplier GSTIN — mandatory for all invoices
2. Invoice number and date
3. Taxable value
4. Tax amount paid (IGST / CGST / SGST / Cess, as applicable)
5. Category — inputs, inputs in semi-finished goods, inputs in finished goods, or capital goods

For capital goods, you must additionally state the date of purchase and the ITC originally availed by the previous regime taxpayer (if books show it) or the tax paid on the invoice.

The One-Year Invoice Rule

A critical and frequently overlooked constraint: invoices included in Form ITC-01 for inputs (not capital goods) must not be older than one year from the date the registration becomes effective. If you have raw material stock purchased 14 months ago sitting in your godown on the day of registration, the embedded GST is not recoverable — even if the invoices are perfectly valid.

For capital goods, no such one-year restriction applies; the five-year useful life formula (see below) governs instead.

How to File ITC-01 — Step by Step

1. Log in to the GST portal (gst.gov.in)
2. Navigate to: Services → Returns → ITC Forms
3. Select Form ITC-01 and the relevant financial year
4. Choose the applicable clause — 18(1)(a), (b), (c), or (d)
5. Enter invoice-level details. For large inventories, use the offline Excel utility available on the portal and upload the JSON
6. Validate and submit. The form goes to the officer for processing; credit appears in your Electronic Credit Ledger (ECL) post-approval
7. In case of capital goods, the system will compute the eligible ITC based on the inputs you enter (purchase date, invoice tax amount); reconcile this with your capital goods register before submission

Worked Example: Composition Dealer Switches to Regular (Section 18(1)(c))

Assume Rajan Plastics is a manufacturer registered under the composition scheme in Maharashtra. On 1 April 2026 (FY 2026-27), it opts out of composition and becomes a regular taxpayer.

On 31 March 2026, its stock position is:

ITC on inputs and semi-finished goods: Rs. 9,00,000 + Rs. 1,80,000 = Rs. 10,80,000 — fully claimable provided invoices are within one year.

ITC on capital goods (machinery): The machinery was purchased 18 months before regularisation. Under Rule 40(1)(b):

• Useful life assumed: 60 months (5 years)
• Period elapsed: 18 months
• Remaining useful life: 42 months
• Eligible ITC = Rs. 3,60,000 × (42 ÷ 60) = Rs. 2,52,000

Total ITC claimable in Form ITC-01: Rs. 10,80,000 + Rs. 2,52,000 = Rs. 13,32,000

This Rs. 13.32 lakh flows into Rajan Plastics' ECL once ITC-01 is approved, and can be used to offset output tax from April 2026 onwards. The form must be filed by 30 April 2026 (30 days from 1 April). A missed deadline forfeits the entire Rs. 13.32 lakh.

Section 18(4): The Reversal Obligation — When You Exit the Regular Scheme

Section 18(4) is the mirror image of 18(1). It applies when:

• (a) A regular taxpayer opts for the composition scheme under Section 10; or
• (b) A registered person whose supplies become wholly exempt from tax

In both cases, ITC availed on inputs in stock, inputs in semi-finished/finished goods, and capital goods must be reversed. The reversal is debited from the ECL and, if the credit balance is insufficient, must be paid in cash.

Capital Goods Reversal Formula Under Rule 44

For capital goods, the reversal is not 100% of original ITC. Rule 44(1)(b) prescribes:

ITC to reverse = ITC originally availed × (Remaining useful life in months ÷ 60)

The useful life is fixed at 60 months regardless of actual depreciation policy or book life.

Worked Example: Regular Taxpayer Opts for Composition

Deepa Textiles, a regular registered business in Tamil Nadu, opts for the composition scheme effective 1 July 2026. On 30 June 2026, it holds:

Total ITC to reverse: Rs. 4,50,000 + Rs. 80,000 + Rs. 1,44,000 = Rs. 6,74,000

Deepa Textiles must debit its ECL by Rs. 6,74,000. If its ECL balance is only Rs. 5,00,000, the shortfall of Rs. 1,74,000 must be paid in cash through Form GST DRC-03 before or at the time of filing Form ITC-03.

Form ITC-03: Filing the Reversal

Form ITC-03 is the vehicle for Section 18(4) reversals. Key compliance points:

1. Deadline: ITC-03 must be filed within 30 days from the date of opting for composition or from the date supplies become exempt
2. Portal path: Services → Returns → ITC Forms → Form ITC-03
3. Content: Provide invoice-level details of inputs (matching stock register), and asset-level details for capital goods (invoice date, original ITC, computation of reversal)
4. Payment: Any reversal amount exceeding available ECL balance must be paid via DRC-03 before submitting ITC-03. The system will not allow submission until the liability is cleared
5. Annual update: If supplies remain exempt or the business remains under composition at the end of each financial year, an annual reconciliation of capital goods must be filed in Form ITC-03 to account for further reduction in useful life

One procedural trap: some advisors incorrectly use GSTR-3B Table 4(B)(2) for Section 18(4) reversals. The correct vehicle is Form ITC-03, not GSTR-3B, for this specific reversal. Using GSTR-3B does not extinguish the obligation to file ITC-03, and the wrong filing can invite a scrutiny notice.

Section 18(3): Transferring ITC on Business Restructuring

Section 18(3) addresses what happens to unutilised ITC when a business changes hands. The section applies to:

• Sale of a business
• Merger or amalgamation
• Demerger
• Lease of business as a going concern
• Any other transfer of business provided liabilities are specifically transferred

The transferor (the entity giving up the business) files Form ITC-02 to transfer its closing ITC balance to the transferee (the entity receiving the business). The credit then appears in the transferee's ECL.

How Form ITC-02 Works

Transferor's steps:

1. File ITC-02 on the GST portal with: transferee's GSTIN, amount of IGST/CGST/SGST/Cess being transferred, and in case of demerger, a certificate from a Chartered Accountant or Cost Accountant confirming the apportionment of ITC based on the value of assets transferred
2. ITC-02 can only be filed if the GST registration of the business being transferred is active at the time of filing

Transferee's steps:

1. The transfer request appears on the transferee's GST portal dashboard
2. The transferee must accept the transfer within the portal; passive acceptance does not occur automatically
3. Once accepted, the credit reflects in the transferee's ECL

Demerger-Specific Rule

In a demerger, ITC is apportioned between the resulting companies in proportion to the value of assets transferred to each entity. The CA/CMA certificate must:

• State the total value of assets of the demerged company
• State the value of assets transferred to each resulting company
• Confirm the basis of apportionment

A mismatch between the ITC-02 filing and the NCLT-approved demerger scheme — or an error in asset valuation methodology — can result in the tax department questioning the entire ITC transfer. The certificate should cross-reference the approved scheme document.

Important Constraint on ITC-02

Section 18(3) only allows transfer of unutilised ITC — credit sitting in the ECL. It does not allow the transferor to claim fresh ITC on inventory and then transfer it. If the transferor has stock with embedded GST that it never claimed (for example, because it was under composition), Section 18(3) is not the right remedy. Section 18(1) is.

Common Mistakes That Cost Real Money

These are patterns that appear repeatedly in compliance reviews:

1. Missing the 30-day ITC-01 or ITC-03 deadline. There is no extension mechanism. Set a calendar alert for day 1 of the status change with the deadline pre-calculated.

1. Including invoices older than one year in ITC-01 for inputs. The credit is ineligible and including it invites a notice. Verify each invoice date against the effective registration date before submission.

1. Not maintaining a stock register as of the day before the status change. Without a defensible stock count reconciled to purchase invoices, the ITC-01 claim cannot be substantiated in audit. A physical or system stock-take on the relevant date is mandatory.

1. Using GSTR-3B instead of ITC-03 for Section 18(4) reversals. The two are not interchangeable. ITC-03 is the specific prescribed form; the GSTR-3B reversal does not satisfy the statutory requirement.

1. Forgetting to account for ITC reversal on capital goods in the ITC-03 computation. Businesses often reverse ITC only on inputs and overlook machinery, vehicles (where eligible), or computers. Each item on the capital goods register needs to be evaluated.

1. Demerger ITC transfer without CA/CMA certificate. The portal will accept the ITC-02 filing without the certificate, but the credit is vulnerable to reversal on assessment if the certificate is missing.

1. Transferee not accepting ITC-02 within time. There is no explicit statutory deadline for the transferee's acceptance, but delays can create a limbo state. In practice, accept the transfer within the same month to ensure the credit is reflected in the ECL before the next GSTR-3B filing.

1. Mismatch between ITC-01 stock and GSTR-2B. From FY 2026-27, ITC eligibility is tightly linked to GSTR-2B matching. Invoices that do not appear in GSTR-2B for the relevant period may not pass the portal validation for ITC-01. Reconcile GSTR-2B before filing.

Capital Goods Register: Build It Before You Need It

Section 18 transactions involving capital goods are only defensible if your capital goods register is current and complete. For each capital goods asset, the register should capture:

• Invoice number and date
• Supplier GSTIN and name
• Asset description and category (plant and machinery, computers, vehicles)
• Invoice value and tax paid (IGST / CGST / SGST)
• Date placed in service (for useful life calculation)
• ITC availed at the time of purchase
• Purpose at time of purchase — taxable, exempt, or mixed use (relevant for Section 17(2) apportionment)
• Blocked credit flag — items under Section 17(5) where ITC was not availed must be excluded from reversal computations as well as claim computations

An asset purchased for exempted business activities from which no ITC was originally availed cannot be claimed under Section 18(1)(d) or reversed under Section 18(4) — only assets where ITC was actually availed (or where ITC eligibility arose) are within scope. A sloppy register that does not track ITC availed versus ITC blocked will produce wrong reversals in both directions.

Alignment With GSTR-2B and Invoice Management System (IMS)

From FY 2026-27, the Invoice Management System (IMS) is fully operational on the GST portal. Suppliers' invoices appear in your IMS dashboard for acceptance, rejection, or pending action before they settle into your GSTR-2B.

For Section 18 purposes, this has two practical implications:

• ITC-01 claims: Invoices included in ITC-01 should ideally appear as "accepted" in IMS. An invoice that is still in "pending" status in IMS creates a reconciliation gap that an audit officer can flag.
• ITC-02 transfers: If the transferor has invoices in its IMS that are pending action at the time of restructuring, those need to be resolved — accepted or rejected — before the ITC balance is transferred. Suspended or disputed credits should not be transferred through ITC-02 as they can create disputes in the transferee's books.

Key Takeaways

• Section 18(1) gives you credit; Section 18(4) takes it back. Both operate on the stock and capital goods position as of the day immediately before the status change — the date of physical stocktake is a compliance event, not just an accounting exercise.
• The 30-day deadline for Form ITC-01 and Form ITC-03 is absolute. Mark the trigger date in your compliance calendar the moment a status change is decided or notified.
• Capital goods credit is time-apportioned over 60 months under Rule 40 (claim) and Rule 44 (reversal). Get the purchase date right; a one-quarter error in age calculation changes the eligible amount.
• Inputs in ITC-01 must be backed by invoices no older than one year from the effective registration date. Pre-screen your stock register before filing.
• Section 18(3) transfers (ITC-02) require the transferee to actively accept the transfer on the portal. In demergers, a CA or CMA certificate on asset-based apportionment is mandatory.
• Do not use GSTR-3B as a substitute for ITC-03. Use the prescribed form for Section 18(4) reversals, and clear any cash shortfall via DRC-03 before submission.
• Align every Section 18 transaction with your GSTR-2B and IMS actions before filing. Mismatches between claimed invoices and the portal's records are the primary trigger for notices under Section 61 scrutiny.