IRS Releases Updated Guidance on Business Interest Deduction Limitations for 2025 Tax Year Onward

The Internal Revenue Service (IRS) recently issued comprehensive guidance, including revised FAQs and Revenue Procedure 2026-17, clarifying the business interest deduction limitation under Section 163(j) of the tax code. These updates, primarily driven by changes introduced in the One Big Beautiful Bill Act (OBBBA), will significantly impact how businesses calculate their deductible interest expenses, particularly for tax years beginning after December 31, 2024.

Specifically, the guidance addresses key modifications to the calculation of adjusted taxable income (ATI), which serves as the base for determining the 30% limit on business interest deductions. For tax years beginning in 2025, businesses will once again be able to add back depreciation, amortization, and depletion when computing ATI. This reversal of a prior rule under the Tax Cuts and Jobs Act (TCJA) is expected to increase ATI for many capital-intensive businesses, thereby allowing a larger portion of their interest expense to be deducted in the current year. The updated framework also expands the definition of floor plan financing interest to include trailers and campers designed for temporary living use, further liberalizing the deduction for certain industries.

For small and mid-sized businesses, particularly those with substantial capital investments or significant borrowing, this revised guidance is not just a technical change; it represents a crucial shift in financial planning strategy. In our experience at C&S Finance Group LLC, navigating the intricacies of Section 163(j) has consistently been a challenge for clients, especially with the fluctuating rules around ATI. The reintroduction of depreciation and amortization add-backs is a favorable development that aligns the tax treatment of interest more closely with a business’s operational cash flow, akin to an EBITDA-based measure. This clarity can empower businesses to make more informed decisions regarding financing, capital expenditures, and even mergers and acquisitions in today’s high-interest rate environment. We regularly assist clients with tax preparation and compliance, ensuring they fully leverage such beneficial changes while maintaining adherence to complex regulations. Businesses seeking to understand the specific implications for their operations and optimize their deductions should contact C&S Finance Group LLC at csfinancegroup.com to get started.

The changes outlined in the IRS guidance are phased, with additional provisions taking effect for later tax years. For tax years beginning after December 31, 2025, the guidance further clarifies that business interest expense will be calculated before most interest capitalization provisions, with exceptions for Sections 263(g) and 263A(f). Additionally, certain controlled foreign corporation (CFC) income will be excluded from the ATI calculation in these later years. These subsequent adjustments aim to refine the limitation even further, ensuring a more precise alignment with a company's core business operations.

The historical context of Section 163(j) is important for understanding the significance of these updates. The TCJA, enacted in 2017, initially introduced the 30% ATI limitation on business interest deductions, effective for tax years beginning after 2017. A critical component of the TCJA’s implementation was the temporary removal of depreciation, amortization, and depletion from the ATI calculation for tax years 2022 through 2024. This temporary change significantly reduced the ATI for many taxpayers, consequently limiting their allowable business interest deductions and often leading to disallowed interest expenses carried forward. The OBBBA effectively reverses this temporary restriction, making the add-back of these items permanent and more favorable for businesses moving forward.

The impact of these updates extends broadly across the U.S. business landscape. Capital-intensive sectors, manufacturing, real estate, and companies undertaking significant expansion or acquisition activities stand to benefit considerably from the increased deduction capacity. The guidance provides greater clarity and flexibility in financial planning, potentially supporting more strategic borrowing and smoother execution of transactions by reflecting operating performance rather than taxable income alone. While the general rule limits deductions to 30% of ATI, and disallowed interest can be carried forward, the increased ATI will reduce instances of disallowance for many.

It is also important to note that the existing exemption for smaller businesses remains in place. Companies with average annual gross receipts below an inflation-adjusted threshold are generally exempt from the Section 163(j) limitation. For pass-through entities such as partnerships, limited liability companies (LLCs) treated as partnerships, and S corporations, the limitation is calculated first at the entity level and then, in certain circumstances, at the owner level, requiring careful attention to complex instructions.

As businesses prepare for the upcoming tax years, understanding the nuances of these updated rules will be critical. The IRS guidance, while providing much-needed clarity, underscores the ongoing complexity of business tax law. Companies should continue to monitor further IRS clarifications and consult with tax professionals to ensure full compliance and optimize their financial strategies in response to these evolving regulations.