For automotive leaders navigating record-high investment demands, the One, Big, Beautiful Bill (OBBB) offers something rare: clarity, flexibility, and meaningful tax advantages. These changes affect everything from R&D spending and plant construction to interest deductibility and equipment purchases — creating powerful incentives for both well-established companies and companies committed to growing their U.S. presence. Below are the four provisions most likely to shape investment and tax strategy in the automotive sector.
OBBB restores domestic R&D expensing: A major win for automotive innovators
The OBBB delivers long-awaited relief to OEMs and suppliers by reinstating the immediate deduction of all domestic research and experimental expenditures beginning in 2025.
Companies can once again fully expense U.S.-based engineering, testing, prototyping, software development, and other innovation-related costs in the year they occur. For an industry defined by intensive engineering cycles, especially in areas such as EV development and software-defined vehicle platforms, this shift provides a meaningful and immediate cash flow boost.
The new rules also allow taxpayers to unwind the capitalization burdens imposed by the Tax Cuts and Jobs Act from 2022 through 2024. Businesses may continue amortizing those prior-year domestic R&D costs, but two new elections offer more strategic flexibility: deducting all remaining unamortized balances in 2025, or spreading those deductions ratably over 2025 and 2026 (for calendar year taxpayers). Smaller companies meeting the small business taxpayer definition gain an additional benefit: the ability to amend 2022–2024 returns to remove capitalization entirely. Statutory dates could apply, but elections must be made no later than July 6, 2026.
These changes carry strong implications for OEMs investing in programs where engineering labor, prototype fabrication, simulation modeling, and development of technologies such as thermal management algorithms and autonomous driving software represent substantial ongoing costs. Under the reinstated expensing rules, domestic research and experimental expenditures can be deducted immediately, freeing up capital for reinvestment in future model cycles and accelerating innovation.
Companies that shoulder early-stage development and engineering requirements stand to benefit as well. Previously, mandatory capitalization forced suppliers and OEMs with thin margins to defer deductions for large engineering payrolls, constraining liquidity. Beginning in 2025, immediate expensing aligns tax deductions with the cash flow being output for these automotive programs. In addition to immediate expensing, companies can also opt to expense any remaining unamortized balances from prior years, a valuable tool for companies engaged in multiyear platform launches.
Importantly, the OBBB leaves the treatment of foreign R&D unchanged. Engineering and software development performed in offshore centers must still be amortized over 15 years. For global automotive companies, this preserves a significant tax distinction based on where engineering talent is located. As a result, decisions about where to place software and engineering teams become more tax-sensitive, with domestic R&D now carrying potential cash flow advantages over foreign alternatives.
OBBB’s new manufacturing facility deduction: Qualified production property deduction
The OBBB introduces a new incentive for companies investing in U.S. manufacturing capacity: a 100% deduction for qualified production property (QPP) that’s used as an integral part of the taxpayer’s qualified production activity (QPA). This deduction is essentially an expansion of the concept of 100% bonus depreciation to include property that wouldn’t otherwise qualify for accelerated depreciation. The goal is to encourage investment in domestic manufacturing by allowing taxpayers to immediately expense portions of new facilities that are integral to production, rather than depreciating them over decades.
To qualify for the QPP deduction, construction must begin after Jan. 19, 2025, and before Jan. 1, 2029, and the property must be placed in service before Jan. 1, 2031. Only areas directly tied to manufacturing or production are eligible; spaces used for offices, engineering, R&D, or administrative purposes are excluded. The deduction is subject to a recapture rule that’s triggered if the QPP is used for something other than a QPA in the 10-year period following the initial deduction.
The implications of this deduction are significant for automotive manufacturers. OEMs planning new U.S. plants or major expansions may be able to fully expense substantial portions of facilities used for core production processes such as body-in-white, paint, final assembly, casting, or battery pack manufacturing. Pairing the new QPP deduction with the expanded 100% bonus depreciation rules will allow companies to fully realize the tax benefit of substantially all of their investments in new manufacturing and production facilities. However, these benefits come with detailed definitional requirements that must be satisfied, so advanced planning is critical.
At a high level, this is a first-of-its-kind building‑related deduction that can materially improve cash flow for green-field or expansion projects. Companies evaluating decisions around their U.S. footprint — particularly those considering plant relocations — should consider this opportunity.
OBBB restores 100% bonus depreciation and doubles Section 179 expensing
The OBBB restores 100% bonus depreciation for qualifying assets acquired after Jan. 19, 2025. For automotive OEMs and suppliers this means equipment, tooling, robotics, and other short-lived production assets can once again be fully expensed in the year placed in service, improving cash flow on new investments.
The law also expands Section 179 expensing, doubling the deduction limit from $1.25 to $2.5 million and raising the phaseout threshold to $4 million, fully phasing out at $6.5 million of qualifying purchases. These increased thresholds apply for property placed in service in tax years beginning after Dec. 31, 2024.
When evaluating Section 179 and bonus depreciation opportunities, it’s important to note that they each have their own set of rules, and the related state tax treatment may vary. Both changes have retroactive effect, but there are important nuances to the effective dates. Pay careful attention to both the acquisition date and placed-in-service date requirements for bonus depreciation — a binding contract signed before Jan. 20, 2025, locks the asset into the old (much lower) bonus rules — even if the asset isn’t delivered or functioning until 2025.
OBBB eases business interest limitations for capital-intensive manufacturers
Beginning in 2025, the OBBB makes a major permanent change to the business interest limitation under Section 163(j) by restoring the ability to add back depreciation and amortization when calculating adjusted taxable income (ATI). Since the 30% interest limit is applied to ATI, this change increases the amount of interest manufacturers can deduct — especially those with significant capital assets and depreciation. This ATI addback restoration applies to tax years beginning after Dec. 31, 2024.
Not all states will follow these more favorable federal rules, so expect state-level conformity differences. Note that the restored addbacks tie directly into other OBBB provisions: 100% bonus depreciation, QPP expensing, and domestic R&D write-offs all generate depreciation or amortization that increases ATI; these deductions not only reduce taxable income but also boost the interest deduction ceiling.
The benefits of these provisions for automotive OEMs and suppliers are significant. For example, battery facility investments generate heavy depreciation, and under the restored rules those deductions increase ATI, allowing OEMs to deduct more interest on large-scale financing during multiyear build-outs. Suppliers see similar advantages: High tooling and automation costs raise depreciation, and therefore ATI, increasing allowable interest deductions as production lines are modernized. Early-stage companies with low taxable income will benefit as depreciation addbacks increase ATI even when earnings are thin, improving interest deductibility during scale-up.
State conformity and other considerations
States vary in how they incorporate changes to the Internal Revenue Code (IRC) into the calculation of their income tax base. So, when considering the opportunities provided by the OBBB, companies must also consider state conformity. Some states conform automatically; others conform selectively, or only to prior versions of the IRC. As a result, states may decouple from the restored ATI addbacks or from related provisions such as 100% bonus depreciation, Section 179 expansion, or the revised treatment of R&D costs. For multistate automotive manufacturers and suppliers, the effective impact of these federal benefits will differ by jurisdiction, making state-level modeling an essential part of evaluating the overall tax effect.
Equally important is how the federal provisions interact. For example, the effect of a more favorable business interest deduction environment compounds when layered with 100% bonus depreciation, QPP expensing, and the ability to deduct domestic R&D costs — reinforcing the broader OBBB theme: a lower after-tax cost of investment for companies building and expanding in the United States.
Final thoughts on the OBBB’s impact on automotive manufacturers
Across its provisions, the OBBB restores and expands incentives that directly benefit automotive OEMs, suppliers, engineering firms, and emerging mobility startups. Together, they create a more supportive tax environment — one that rewards domestic production, accelerates cash flow, and lowers the after-tax cost of innovation at a time when companies are investing heavily in new facilities, strengthening supply chains, and adopting next-generation technologies.
With this new opportunity, however, comes added complexity. Many of the provisions operate on tight timelines, have their own eligibility rules, and can be affected significantly by jurisdiction. These moving pieces make it essential to work with tax specialists who understand the automotive industry and can model how the provisions interact with your specific footprint, capital plan, and financing profile. For a deeper dive into the OBBB’s impact on manufacturing, see our article “The One, Big, Beautiful Bill: Key insights for manufacturers.”
The OBBB ultimately brings long-awaited clarity and meaningful opportunities for strategic tax planning across the automotive sector. Now’s the time to engage your tax advisors, run scenarios, and align your strategy with the new rules.
