An old duty credit can still matter to the current opening basis
For FY 2025–26 / AY 2026–27, section 43(1), Explanation 9 of the Income-tax Act, 1961 requires the specified actual-cost reduction for assets acquired on or after 1 March 1994. It concerns excise duty or additional duty under section 3 of the Customs Tariff Act, 1975 where the stated credit claim was made and allowed under the Central Excise Rules, 1944 referenced in Explanation 9. This is a historical cost-reconstruction guide, not advice to claim a fresh legacy credit or a general GST input-credit rule.
Read the applicable text: Income Tax Department: section 43(1), Explanation 9 Income Tax Department: earlier-year transition.
Prove the exact duty and legal credit history
Retain the original acquisition invoice or import document, duty component, credit claim, allowance evidence and asset identifier. Do not treat every amount called CVD, every customs levy or every credit entry as automatically within this provision. Where the historical credit arose under a different rule framework, establish the applicable legal treatment rather than silently assuming the statutory reference covers it. The examples assume the relevant duty-credit population has already been legally verified.
Distinguish original cost from net capitalisation
Show gross otherwise-established acquisition cost, qualifying allowed credit, adjusted tax actual cost and the amount originally capitalised in the tax schedule. If the cost already excludes the same credit, a second subtraction understates it. Conversely, a gross book amount does not prove that the tax schedule omitted the reduction. Match the earlier returns and asset working before deciding that a current error exists.
Do not reduce today's WDV mechanically by an old credit
Historic tax cost, intervening depreciation, additions and disposals form a chain. An old credit may already be embedded in that chain. Reconstruct the affected years and identify the actual discrepancy; do not simply subtract the credit from a current block without checking previous treatment. If an earlier return or order is wrong, the available correction route and effect on subsequent years require separate analysis.
Separate pending and non-covered credits
A claim merely filed is not the same evidential state as a qualifying claim made and allowed. Preserve disputed, rejected and untraced amounts separately. This article does not decide the full actual-cost treatment of every pending claim, credit reversal or later change. Likewise, do not transplant Explanation 9's wording into every GST or other customs-credit situation. Determine the correct provision and historical rules for each component.
Close the asset-to-block reconciliation
Link the duty evidence to acquisition cost and then to the supported opening tax block. Keep book carrying values separate and do not replace verified historical cost with a current valuation. Only after the cost history is resolved should the applicable current depreciation computation be completed. No rate, fresh credit entitlement or ITR field is assumed here; the objective is to prevent an unsupported opening basis or duplicate reduction.
Six worked illustrations
All facts and amounts are fictional. Calculations illustrate the stated assumptions, not a predetermined legal outcome.
Illustrative example 1: Gross acquisition cost
Assume otherwise-established acquisition cost of ₹100 lakh includes ₹10 lakh of legally verified qualifying allowed credit. Adjusted actual cost is ₹90 lakh. The ₹10 lakh is a cost reduction, not a second depreciation deduction.
Illustrative example 2: Claim versus allowed amount
Assume a ₹5 lakh claim contains ₹4 lakh established as qualifying and allowed, while ₹1 lakh remains unresolved. On an otherwise-established ₹100 lakh cost, the proved Explanation 9 reduction is ₹4 lakh. The resulting ₹96 lakh is a provisional reconciliation before resolving the remaining component and other applicable rules.
Illustrative example 3: Net cost already recorded
An earlier tax schedule correctly starts at ₹90 lakh after reducing gross ₹100 lakh cost by ₹10 lakh credit. Reducing it again to ₹80 lakh understates cost by ₹10 lakh. Match the original reconciliation before proposing a correction.
Illustrative example 4: Two separately identified assets
Assume verified gross costs of ₹100 lakh and ₹50 lakh with qualifying allowed credits of ₹10 lakh and ₹5 lakh. Adjusted costs are ₹90 lakh and ₹45 lakh, total ₹135 lakh. The total credit reduction is ₹15 lakh; preserve the two asset links.
Illustrative example 5: Historical basis already flows into WDV
Assume adjusted historical cost ₹90 lakh and a separately verified cumulative tax-depreciation reduction of ₹45 lakh, with no other movements. The supported remaining basis is ₹45 lakh. Deducting the old ₹10 lakh credit again gives ₹35 lakh, a ₹10 lakh understatement.
Illustrative example 6: Component evidence mismatch
A cost file shows ₹12 lakh labelled duty credits, but documents establish ₹7 lakh qualifying excise credit and ₹3 lakh qualifying additional-duty credit; ₹2 lakh is untraced. Proved qualifying credits total ₹10 lakh. Investigate the ₹2 lakh separately rather than treating the label as allowance evidence.
Ten-step verification table
| Step | Action | Evidence |
|---|---|---|
| 1 | Fix the return period | FY 2025–26 / AY 2026–27 and applicable enactment. |
| 2 | Identify historical acquisitions | Date, asset and original cost evidence. |
| 3 | Classify duty components | Exact levy and legal credit framework. |
| 4 | Verify claim and allowance | Claim records and supported allowed amounts. |
| 5 | Separate unresolved items | Pending, disputed or untraced components. |
| 6 | Read original tax capitalisation | Gross versus already-net cost. |
| 7 | Trace intervening tax movements | Depreciation, additions, disposals and orders. |
| 8 | Prevent duplicate reduction | Credit reflected once in the cost-to-WDV chain. |
| 9 | Assess any correction route | Earlier-year issue distinguished from current input error. |
| 10 | Close the current working | Supported asset-to-block reconciliation and separate depreciation checks. |
Sixteen practitioner FAQs
1. Is this a fresh credit-claim guide?
No. It reconstructs historical tax cost for the stated return period.
2. Which acquisition-date condition is addressed?
The Explanation refers to assets acquired on or after 1 March 1994.
3. Does every customs duty qualify here?
No. Identify the precise duty and statutory conditions.
4. Does the label CVD settle the legal treatment?
No. Establish the exact levy and credit history.
5. Is a filed claim the same as an allowed claim?
No. Preserve the distinction and supporting evidence.
6. Can different historical credit rules be assumed identical?
No. Verify the applicable legal framework.
7. Does the book cost prove the tax schedule is wrong?
No. Compare the separate accounting and tax histories.
8. Can already-net cost be reduced again?
No. That duplicates the same credit reduction.
9. Should an old credit always be subtracted from current WDV?
No. First reconstruct whether it is already reflected.
10. Does a current valuation replace old acquisition evidence?
No. It does not establish the historical tax-cost chain.
11. Can unresolved credits be treated as proved reductions?
Do not infer allowance from an unexplained ledger label.
12. Does the article determine every pending-credit outcome?
No. Resolve the remaining components under their applicable provisions.
13. Can the historical credit be claimed as a separate depreciation deduction?
No. This analysis concerns actual-cost reduction.
14. Does this establish a current depreciation rate?
No. Rate and eligibility require separate verification.
15. Does a historical error automatically have one correction route?
No. The available remedy depends on the relevant return, order, year and facts.
16. What is the key closing evidence?
Duty claim and allowance linked to original cost and the supported current tax-block balance.
Official sources
Income Tax Department: section 43(1), Explanation 9 Income Tax Department: earlier-year transition