This article is part of a series detailing meaningful proposed tax law changes that could have far reaching implications to all types of businesses.
The debate and negotiations over tax reform are taking shape in the United States Congress. The United States Senate is reviewing the ‘One Big Beautiful Bill Act’ (OBBBA) passed by the US House of Representatives in late May. The House-passed legislation contains meaningful tax reforms with potentially significant impact to businesses and individuals.
Bonus depreciation and Section 179 expensing
The OBBBA also proposes significant changes to bonus depreciation and Section 179 expensing.
Bonus depreciation: The current 40% bonus depreciation for 2025 is proposed to return to 100% for qualified assets placed in service after January 19, 2025, and before January 1, 2030. This allows businesses to fully deduct the cost of eligible assets upfront.
Section 179 expensing: The maximum Section 179 deduction is proposed to increase from $1,250,000 to $2.5 million, with the phase-out threshold rising from $3,130,000 to $4 million.
Key differences: Section 179 cannot create a loss, while bonus depreciation can. Most states do not follow bonus depreciation rules, but some allow Section 179.
Qualified Business Income (QBI) deduction extension and enhancement
The OBBBA extends the existing law that allows a deduction against business income for qualifying flow-through businesses (non-C-corporation entities).
Deduction enhancement: The deduction for QBI will increase from 20% under current law to 23% for tax year beginning after December 31, 2025.
Permanent extension: The deduction for QBI will be made permanent
Threshold limit and inflation adjustment: The taxable-income threshold (currently $197,300 for singles / $394,600 for joint filers in 2025) is increased for inflation, maintaining higher eligibility before limitations begin.
This provision aims to promote economic growth and incentivize the development of new businesses by reducing the income tax costs to business owners of flowthrough entities.
Business interest deductions (Section 163(j))
The OBBBA aims to revise how deductible interest expenses are calculated under Section §163(j).
Adjusted Taxable Income (ATI) calculation: Pre-2022, EBITDA (earnings before interest, tax, depreciation and amortization) was used, allowing higher deductions. From 2022–2024, EBIT became the basis, reducing deductible interest for many companies. The House bill will temporarily restore EBITDA as the basis for tax years 2025 through 2029, which would increase interest deductibility for capital-intensive businesses.
Deduction limit: The 30% of Adjusted Taxable Income deduction limit remains unchanged.
Small business exemption: Currently, businesses with average gross receipts of $30 million or less over the previous three years are exempt from the interest expense limitation. The OBBBA proposes to extend the lookback period to five years and add a new $80 million threshold for manufacturing businesses, with both thresholds subject to inflation adjustments. This could qualify more small and mid-size manufacturers for exemption and provide stability for businesses with fluctuating revenue.
Carryforward rules: Disallowed interest can still be carried forward indefinitely, with rules varying by entity type (C-Corp, Partnership, S-Corp).
This table summarizes the changes:
Feature |
Current law (2024) |
Proposed (OBBBA) |
ATI Calculation |
EBIT |
EBITDA for 2025–2029 |
Small business exemption |
Average gross receipts < $30M (3-yr lookback) |
Average gross receipts < $30M (5-yr lookback); New $80M threshold for manufacturers; Both indexed for inflation |
These changes could offer substantial tax relief, especially for businesses with significant debt financing or capital investments.
The bill is still in committee but has a target enactment date of July 4, 2025, making it crucial for planning. BerryDunn’s tax and compliance team has a deep understanding of the proposed tax reforms and can help you and your business plan for these changes to maximize the opportunities and minimize the costs.