IRSFinal RuleOctober 2, 2025

Interest Capitalization Requirements for Improvements that Constitute Designated Property

Finance & BankingHousing

Summary

This IRS rule clarifies when businesses must add interest costs to the value of long-term property improvements rather than deducting them immediately as expenses. The regulation affects how companies account for construction and upgrades to buildings and similar assets, potentially changing their tax bills.

Key Points

1Businesses must capitalize (add to asset value) interest costs during construction or improvement of certain long-term property instead of claiming them as immediate tax deductions
2The rule applies to 'designated property' including buildings, land improvements, and other assets that take substantial time to construct or prepare for use
3Companies must track interest costs separately during construction periods and add them to the property's basis, affecting depreciation deductions over time
4The regulation impacts real estate developers, manufacturers, and other businesses that finance long-term capital projects
5This change may reduce current-year tax deductions for affected companies but could alter the timing and amount of tax benefits over the asset's useful life

Impact Assessment

If you are a Small Business owner, this means you may need to capitalize interest costs on construction and property improvements instead of deducting them immediately, which could defer tax deductions and affect your cash flow.

Impact Level

Significant

Geographic Scope

National

Compliance Cost

Moderate

Who is Affected

Small BusinessesManufacturersFinancial Institutions

Key Dates

Published

October 2, 2025

Regulatory Connections

Authorized By

Internal Revenue Code Section 263A

Amends CFR Sections

26 CFR Part 1

Read on Federal Register View Docket

This summary is for informational purposes only. It may not capture all nuances of the regulation. Always refer to the official text for authoritative information.