Capital investment across the United States is currently surging well above standard economic projections, driven in large part by a massive national buildout in artificial intelligence and its associated infrastructure. This unexpected investment boom is actively intersecting with a key set of structural provisions found within the 2025 tax law, known broadly as the One Big Beautiful Bill Act, or OBBBA.
Among its various reforms, the legislation successfully corrected a long-standing structural issue within the federal tax code concerning the rules for deducting capital expenditures. Under the updated framework, American firms can once again fully and immediately deduct the cost of short-lived investments directly from their taxable income. While this immediate expensing mechanism naturally applies to high-demand assets like advanced AI servers and specialized HVAC cooling components for expanding data centers, its application is entirely neutral, extending seamlessly to a much broader, highly diverse set of economic assets that have no direct connection to the technology sector.
However, this accelerated growth in physical and technological investment is coinciding with a noticeable short-term decline in federal corporate tax receipts, which have dropped by approximately 25 percent over the past year. This notable fiscal shift has triggered widespread public and policy discussions, frequently giving rise to three common misunderstandings regarding the mechanics of bonus depreciation. Critics and casual observers often mistakenly treat the policy as a permanent tax cut rather than a neutral timing change, significantly overestimate its long-run fiscal cost to the federal government, and incorrectly frame it as a targeted government subsidy for private businesses when it merely removes an embedded tax penalty on capital investment.
Expensing Allows Firms to Deduct Investment Costs Now, Not Later
When lawmakers and economists set out to design a rational business tax system, they must fundamentally decide whether capital investments should be officially recognized as standard business costs and deducted immediately when they are purchased, or whether those expenses must be artificially spread out over many years of depreciation schedules.
Under prior United States tax law, firms were strictly required to deduct their investment costs over extended multi-year periods according to preset depreciation schedules, rather than taking the deductions immediately in the tax year the investments actually occurred. The OBBBA introduced critical changes to this cost recovery framework, steering the national tax code firmly back in the direction of full expensing.
Crucially, the expensing provisions enacted under the OBBBA represent a fundamental timing change rather than a special tax cut or government handout. Businesses ultimately take the exact same nominal dollars of deductions under full expensing as they are historically permitted to take under prolonged depreciation schedules over time. Rather than serving as a generous tax break, immediate expensing simply aligns tax deductions with actual corporate expenditures as they happen in the real world.
This structural alignment produces a powerful and enduring economic benefit: it ensures that artificial depreciation delays no longer artificially inflate after-tax investment costs. When firms are legally forced to wait years to fully take their deductions, inflation and the basic time value of money continually erode the real value of those write-offs. This lag understates real economic costs while overstating real corporate profits, effectively driving up the after-tax cost of capital. By matching the timing of tax deductions with the actual timing of investment expenses, the tax code removes this hidden penalty, successfully lowering the cost of capital and generating broader incentives for increased business investment.
At the same time, this timing fix for federal tax purposes frequently runs counter to the accounting standards used in other areas of corporate finance, particularly when companies calculate book profits for their financial statements. Standard accounting rules generally mandate that firms deduct a portion of their investment expenses incrementally each year. This operational reality inevitably gives rise to noticeable book-tax gaps. In the near term, corporate tax payments to the federal government may decline even as those same firms appear robustly profitable on their public financial statements. Over a longer operational horizon, however, these temporary book-tax gaps caused by timing differences in capital expenditure deductions naturally fade away.
Corporate Income Tax Receipts Dip in the Short Run, but Mostly Recover Later
Accelerating depreciation deductions inherently reduces the total tax liability that firms owe in the short run relative to baseline expectations, primarily because deductions that would have otherwise been spread out over a decade can suddenly be taken all at once in the first year.
The fiscal cost of this transition is naturally greatest in the very first few years following implementation, as businesses simultaneously claim accelerated deductions for brand-new investments while finishing up legacy depreciation deductions for prior capital projects. As those older investments are completely written off, the long-run fiscal cost declines significantly, eventually stabilizing close to the net increase in the present value of total business tax deductions.
As a case in point, economic modeling conducted by the Tax Foundation previously estimated that making bonus depreciation permanent under the OBBBA would result in a revenue loss falling from $79.5 billion in 2026 down to $21.5 billion by 2035. Under these projections, federal revenues would stabilize much closer to the pre-2025 Congressional Budget Office baseline near the end of the standard ten-year budget window. Between 2025 and 2035, the Tax Foundation estimated that permanent bonus depreciation would reduce federal revenues by roughly $473.1 billion on a conventional static basis. Additionally, the modeling indicated that temporary structures expensing would reduce revenue by about $27 billion over the same window, while restoring research and development expensing would reduce revenue by $178 billion, with those costs heavily concentrated in the first two years due to retroactive restorations.
So far, actual federal corporate revenues appear to be tracking closely alongside these initial projections. However, overall business investment is currently rising at a much faster pace than standard economic models anticipated, heavily propelled by outside macroeconomic drivers such as the ongoing artificial intelligence boom. Because of this external market momentum, corporate tax receipts could experience a deeper near-term dip than originally projected as investment surges. Even so, economic fundamentals dictate that these same tax revenues will eventually rebound as corporate taxable profits climb higher in the future.
The fiscal picture improves considerably when analysts account for the broader dynamic economic effects of permanent bonus depreciation. Conventional revenue scoring models tend to overestimate the real fiscal cost because they deliberately exclude the income and payroll tax feedback loops that naturally result from operating a larger, more productive national economy. For instance, the Tax Foundation estimated that implementing permanent bonus depreciation would ultimately increase long-run gross domestic product by 0.6 percent. When evaluated on a dynamic scoring basis, the policy is projected to cost $44 billion from 2025 through 2035—representing only a fraction of its conventional revenue cost.
Focusing exclusively on the immediate, short-term dip in corporate tax receipts ignores the fundamental reality that expensing is fundamentally a timing change that will be largely recovered over time. Furthermore, it overlooks the reality that a rapidly growing national economy inherently produces higher individual income and payroll tax revenues across the board.
Expensing Is Not a Subsidy
Immediate expensing is not a targeted government carveout or a special industrial policy designed to encourage specific types of commercial investments over others. Instead, it is a broad-based, structural improvement to the tax code that treats all forms of capital investment neutrally.
A rational business will only pursue a new investment project if its expected rate of return successfully clears the firm’s internal hurdle rate, commonly referred to as the user cost of capital. A traditional tax system based on rigid depreciation schedules artificially increases the user cost of capital, causing some marginal commercial projects that would otherwise be economically viable to be abandoned entirely for purely tax-driven reasons. In sharp contrast, a modern tax system based on full expensing exerts zero negative impact on the user cost of capital for a marginal investment, successfully removing the federal income tax distortion from the equation altogether.
Correcting the tax treatment of business investment by providing permanent bonus depreciation does not mean that firms are suddenly choosing to invest inside the United States simply because of a tax deduction. Rather, it ensures that the federal tax code no longer acts as an artificial barrier standing in the way of marginal investment.
Of course, many corporate investments fall outside the strict definition of a marginal investment. These projects frequently promise exceptionally large returns, driven by technological innovation, valuable first-mover advantages, or other unique market conditions. In such instances, firms routinely expect returns that far surpass their initial investment costs and will accordingly continue to face substantial positive tax liabilities.
Even in the presence of these highly profitable inframarginal investment opportunities—which likely describe a significant portion of the artificial intelligence infrastructure spending currently sweeping across the broader economy—full expensing remains the economically correct tax treatment. It guarantees that the tax system does not place an unfair structural burden on standard marginal investments. Under a true expensing regime, all firms deduct their initial investment costs upfront, yielding an immediate reduction in their current tax liability. Subsequently, these businesses pay standard corporate taxes on all the resulting profits generated by those projects. If the investments perform far better than initially expected, the federal government actively shares in those expanded returns.
The newly enacted federal tax law successfully altered the timing of business deductions for capital investment, accurately matching tax deductions with actual corporate expenditures by establishing permanent bonus depreciation. While this vital timing change is currently producing an anticipated, short-term decline in corporate tax receipts as the economy transitions away from traditional depreciation schedules, this fiscal dip arrives right as the United States experiences an unprecedented artificial intelligence investment boom largely independent of federal tax policy. This market dynamic may temporarily drive a deeper dip in tax receipts than initially modeled.
Nonetheless, this ongoing investment boom does not undermine the sound economic rationale for full expensing. Expensing remains a vital structural improvement that ensures the tax code does not penalize marginal investment. Under this framework, the government continues to collect robust revenue on genuinely profitable commercial investments while successfully avoiding the economic trap of discouraging vital capital formation.
