We borrowed to build business property. Is all interest immediately deductible while construction continues?
Interest incurred during production may require capitalization under Section 263A(f), even when it is recorded as ordinary financing expense.
By AE Tax Advisors Team · Updated October 28, 2026
Interest incurred during production may require capitalization under Section 263A(f), even when it is recorded as ordinary financing expense. The rules depend on the property produced, production period, thresholds and applicable exceptions. A loan's description alone does not establish the tax deduction.
A specific business-owner situation
A company borrows for a long fabrication project while also carrying working-capital debt. It cannot assume that only interest on the loan labeled construction is relevant to the capitalization computation.
Illustrative example, not a client result.
What to establish before filing
- Classify the produced property.
- Determine the production period and exception eligibility.
- Calculate capitalizable interest using the required method.
Which fact changes the answer?
Property subject to the interest capitalization rules differs from property outside them. The production characteristics and statutory exceptions determine whether the computation is needed.
A mistake to avoid
Do not equate bank interest expense with the current tax deduction without a capitalization review.
Records that support the decision
- Debt schedules and rates.
- Production expenditures by date.
- Placed-in-service records.
The decision to document
Retain a bridge from total interest to capitalized basis, deductible interest and any separate limitation.
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Related questions
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Sources and editorial context
General educational information prepared with AI assistance. No individual professional review is claimed. Apply the relevant tax-year rules to the actual records. Editorial policy · AI disclosure.