Racing the Clock: How General Counsels and CFOs Should Navigate the Post-TCJA Tax Horizon

The Tax Cuts and Jobs Act of 2017 reshaped the American corporate tax landscape more dramatically than any legislation in a generation. Yet the law was constructed, in part, on a foundation of deliberate impermanence. Many of its most consequential provisions carry built-in expiration dates — and the largest cluster of those sunsets arrives at the close of 2025. For corporate boards, general counsels, and chief financial officers, the countdown is no longer theoretical. It is an operational reality demanding structured governance attention today.

Understanding What Is Actually Expiring

Before any strategic planning can occur, leadership teams must develop a precise accounting of which provisions are sunsetting and which are not. Conflating the two is among the most common — and costly — errors in forward tax planning.

The corporate rate reduction from 35 percent to 21 percent, established under Section 11 of the Internal Revenue Code as amended by the TCJA, is permanent. That distinction matters enormously and should anchor any board-level conversation about tax risk. However, a significant number of provisions affecting corporate operations remain time-limited.

Among the most consequential for businesses are the changes to bonus depreciation under Section 168(k), which has already begun phasing down from its original 100 percent allowance and will continue to diminish through 2026. The limitation on business interest expense deductibility under Section 163(j), while permanent in structure, underwent a meaningful tightening in 2022 when the calculation shifted from an EBITDA-based standard to an EBIT-based standard — a change that significantly reduced allowable deductions for capital-intensive companies. Research and development amortization requirements under Section 174, which took effect in 2022, have already forced companies to amortize R&D expenditures over five years rather than deduct them immediately, a shift that has materially affected cash tax positions across the technology and pharmaceutical sectors.

On the individual side, provisions affecting pass-through entities, estate tax exemptions, and the qualified business income deduction under Section 199A are set to revert to pre-TCJA parameters after 2025 — a development with direct implications for closely held corporations and family-controlled enterprises with complex ownership structures.

The Governance Dimension: Where Boards Often Fall Short

Tax risk has historically been treated as a finance function concern, operating largely beneath the board's line of sight. The post-TCJA environment demands a recalibration of that posture. Boards carry fiduciary responsibilities that extend to material financial risks, and a legislative shift of this magnitude — one capable of altering a company's effective tax rate, cash flow projections, and earnings per share — qualifies unambiguously as a material risk requiring board-level engagement.

Audit committees, in particular, should be requesting structured briefings from management on the company's TCJA exposure analysis. This means more than a line item in a quarterly report. It means understanding the company's specific sensitivity to sunsetting provisions, the assumptions embedded in multi-year financial projections, and the contingency frameworks being developed in the event Congress fails to act before the deadline.

The risk of legislative inaction should not be dismissed. Political gridlock has a well-documented history of allowing tax deadlines to lapse, sometimes temporarily and sometimes permanently. Companies that model only a single legislative outcome — full extension, full expiration, or selective renewal — are accepting scenario risk that a robust governance framework should not tolerate.

Common Pitfalls in Forward Tax Planning

Several recurring errors tend to emerge when organizations begin planning around legislative uncertainty of this kind.

Over-reliance on extension assumptions. Many corporate tax teams are quietly building their models on the assumption that Congress will extend the expiring provisions, particularly those affecting individuals and pass-through businesses. That assumption may prove correct, but treating it as a baseline rather than a scenario introduces fragility into the planning process. The prudent approach is to model the full expiration scenario as a primary stress test, not a tail risk.

Failure to sequence accelerated transactions appropriately. For companies considering significant capital expenditures, asset acquisitions, or restructuring transactions, the interaction between current bonus depreciation phase-down schedules and potential legislative changes creates a complex sequencing problem. Transactions placed in service before year-end 2025 may qualify for different — and potentially more favorable — depreciation treatment than those completed in 2026 or beyond. General counsels should be working closely with tax advisors to ensure that deal timelines and closing conditions are structured with this sensitivity in mind.

Neglecting the state tax dimension. Federal tax changes do not exist in isolation. Many states conform to federal tax law selectively, and the TCJA's provisions have produced a patchwork of state conformity positions that adds another layer of complexity to planning. Companies operating across multiple jurisdictions must account for the fact that a federal sunset may produce asymmetric state tax consequences depending on each state's conformity framework.

Underestimating the cash tax impact. Effective tax rate management and cash tax management are related but distinct disciplines. The R&D amortization rules and interest deductibility limitations have already demonstrated that companies can experience significant cash tax increases even when their reported effective tax rate appears stable. Boards and audit committees should be requesting cash tax projections alongside GAAP tax disclosures.

Strategic Levers Worth Examining Now

The planning window that remains is meaningful, but it is compressing. Companies that have not yet initiated a formal TCJA sunset review should treat that gap as an urgent governance matter.

Among the strategic levers worth examining in the near term: accelerating capital investment timelines to capture remaining bonus depreciation benefits; reviewing entity structure for pass-through businesses in light of the Section 199A expiration; evaluating the timing of significant asset dispositions against the backdrop of potential rate changes; and stress-testing debt structures against the 163(j) interest limitation under various legislative scenarios.

For organizations with international operations, the interaction between the TCJA's international provisions — including GILTI, BEAT, and FDII — and the evolving OECD global minimum tax framework adds a further dimension that general counsels and tax directors must navigate in parallel.

A Call for Structured Deliberation

The instinct in corporate legal and finance functions is often to wait for legislative clarity before committing to a planning posture. That instinct, while understandable, is increasingly difficult to justify given the proximity of the 2025 deadline and the lead time required to execute meaningful structural changes.

Proactive governance does not require predicting the outcome of Congressional negotiations. It requires identifying the company's exposure, modeling a credible range of outcomes, and ensuring that leadership has the information necessary to make deliberate decisions rather than reactive ones. In a period defined by regulatory uncertainty, that discipline is not merely good practice — it is a fiduciary obligation.