The books do not decide the statutory exclusion
Section 32(b) of the Income-tax Act, 2025 allows interest on capital borrowed for business or profession, but excludes interest on capital borrowed to acquire an asset for the period from borrowing until the asset was first put to use, whether capitalised in the books or not. This guide applies to tax year 2026–27 using the Act as amended by Finance Act, 2026, checked on 27 October 2026. It isolates this exclusion rather than deciding depreciation, actual cost or every other deduction restriction. Income-tax Act, 2025 as amended by Finance Act, 2026: section 32(b).
Trace the borrowing to its purpose
Obtain the loan agreement, drawdowns, bank transfers, asset invoices and project accounts. A loan’s label is useful evidence but cannot replace tracing of its actual purpose. For a mixed borrowing, support the allocation between acquisition and other business uses. Do not apply the exclusion to an unrelated working-capital facility merely because the business bought an asset during the year.
First use requires a factual file
Distinguish acquisition, delivery, installation, readiness, commissioning and actual first-use evidence. A borrowing date is not the asset-use date, and a year-end management certificate should be corroborated. Where trial operation, passive use or disputed facts matter, obtain a specific legal analysis rather than assuming the accounting readiness date decides the tax test. The examples use agreed first-use facts and full-month costs to avoid an unsupported daily boundary convention.
Separate the exclusion from the tax adjustment
Calculate excluded interest first, then identify how much of it has reduced the book-profit starting figure. If already capitalised without a profit-and-loss charge, adding it back again can inflate taxable profit. Conversely, leaving an excluded amount in deductible finance costs because the books expensed it ignores the statutory wording. Preserve the asset-cost and depreciation analysis as a separate schedule.
Review the remainder independently
The amount outside the pre-use exclusion is not automatically an unconditional tax deduction. Check business purpose, payment and other applicable restrictions on the actual facts. The illustration rates and monthly costs are fictional financing assumptions, not tax rates or a substitute for the lender’s actual interest schedule.
Applicable primary references
Income-tax Act, 2025 as amended by Finance Act, 2026: section 32(b)
Six worked illustrations
All facts and amounts below are fictional. Assumptions describe the model, not additional statutory rules.
Illustrative example 1: Six complete pre-use months
A specific acquisition loan incurs accepted actual interest of ₹10,000 per month from April through March. The asset is first used on 1 October 2026; assume April–September is the agreed excluded period. Excluded interest is ₹60,000 and the other six months total ₹60,000, subject to separate deduction checks. Full-year interest is ₹1,20,000.
Illustrative example 2: Books expense the excluded amount
Of ₹90,000 actual acquisition-loan interest, ₹30,000 relates to the agreed pre-use period. All ₹90,000 reduced book profit. The adjustment for this exclusion is ₹30,000; the remaining ₹60,000 needs its own deduction review.
Illustrative example 3: Already capitalised
The books capitalise all ₹45,000 pre-use interest without reducing the profit starting figure. The excluded amount remains ₹45,000, but the add-back for that amount is nil. Adding ₹45,000 despite no corresponding book deduction would duplicate the adjustment.
Illustrative example 4: Mixed finance-cost ledger
Finance costs of ₹1,80,000 comprise ₹1,20,000 acquisition-loan interest and ₹60,000 unrelated working-capital interest. Of the acquisition interest, ₹40,000 is pre-use. The section 32(b)(i) exclusion in this model is ₹40,000; ₹1,40,000 remains for other tests, not ₹60,000 merely because all acquisition interest was rejected.
Illustrative example 5: Two independently traced assets
Asset A has accepted pre-use interest of ₹25,000 and Asset B ₹35,000, with separate supporting periods. Total exclusion is ₹60,000. If only A’s ₹25,000 was expensed and B’s ₹35,000 capitalised, the corresponding book-profit add-back is ₹25,000.
Illustrative example 6: Loan allocation
A ₹10,00,000 borrowing is demonstrably used ₹6,00,000 for acquisition and ₹4,00,000 for other business purposes. Assume an accepted proportional allocation of ₹50,000 interest for a wholly pre-use interval. Acquisition interest is ₹30,000 and other-use interest ₹20,000. The 60% allocation is evidence-based in this model, not a prescribed statutory percentage.
Ten-step verification table
| Step | Action | Evidence |
|---|---|---|
| 1 | Identify year and statutory version | 2026–27 and amended Act |
| 2 | Identify borrowing purpose | Loan and acquisition records |
| 3 | Trace disbursement and use | Bank-to-invoice mapping |
| 4 | Separate mixed uses | Supported allocation |
| 5 | Establish first-use facts | Operational and commissioning evidence |
| 6 | Reconcile actual interest | Lender schedule and ledger |
| 7 | Calculate excluded period costs | Asset-wise working |
| 8 | Inspect book treatment | Capitalised and expensed split |
| 9 | Review other restrictions separately | Deduction and asset-cost analysis |
| 10 | Finalise the tax bridge | No duplicate deduction or add-back |
Sixteen practitioner FAQs
1. Does book capitalisation control the exclusion?
No. The provision expressly applies whether capitalised in the books or not.
2. Is all acquisition-loan interest excluded forever?
The cited exclusion concerns the borrowing-to-first-use period; assess the rest separately.
3. Does an unrelated working-capital loan automatically fall within it?
No. Trace the purpose and facts of that borrowing.
4. Can a loan label alone establish use?
Support it with actual disbursement and expenditure evidence.
5. How should mixed borrowings be handled?
Use a documented allocation supported by actual uses, rather than an invented ratio.
6. Is delivery necessarily first use?
Do not equate the events without examining operational facts.
7. Does accounting readiness settle the tax date?
Not automatically. Apply the tax test to supported facts.
8. How should disputed trial-use facts be treated?
Obtain a specific position rather than treating this simplified model as a ruling.
9. Why do the examples use full months?
Their agreed facts isolate the exclusion without inventing a daily boundary rule.
10. Should already capitalised interest always be added back?
Only reconcile an amount that actually reduced the relevant profit starting figure; avoid a duplicate adjustment.
11. Does this guide establish tax depreciation cost?
No. Maintain the actual-cost and depreciation analysis separately.
12. Is the post-use portion automatically deductible?
Other applicable deduction conditions still require review.
13. Can the same interest be deducted twice through different schedules?
No. Cross-reference the finance-cost, tax and asset schedules.
14. Are the financing rates statutory?
No. All model costs and allocations are fictional assumptions.
15. What if two assets start operating at different times?
Keep separate first-use evidence and attributable interest workings.
16. What is the final review output?
A borrowing-purpose, first-use and book-treatment reconciliation with the resulting tax adjustment.
Conclusion
Separate asset-acquisition borrowing costs before first use from other interest, then reconcile the tax adjustment to the amount actually charged in the books.