The Tax Cuts and Jobs Act (TCJA) of 2017 represented the most significant overhaul of the United States tax code in over thirty years. While it brought substantial relief to many taxpayers through lower rates and increased deductions, many of its most impactful provisions were temporary by design. On December 31, 2025, a significant portion of the TCJA is scheduled to "sunset." Unless Congress intervenes with new legislation, the tax landscape will revert to pre-2018 rules on January 1, 2026. For high-net-worth individuals, business owners, and families, the next 24 months represent a critical window for strategic tax planning to mitigate the impact of this looming fiscal cliff.
Understanding the TCJA Sunset: What Changes are Coming?
The expiration of the TCJA provisions will affect almost every aspect of the individual tax code. To plan effectively, it is essential to understand which specific levers are moving. The shift isn't just about one or two rates; it is a comprehensive restructuring of how taxable income is calculated and taxed.
The Return of Higher Individual Income Tax Brackets
Perhaps the most visible change will be the reversion of individual income tax brackets. The TCJA lowered the top marginal tax rate from 39.6% to 37%. In 2026, this top rate is scheduled to climb back to 39.6%. Furthermore, the income thresholds for the lower brackets will shift, effectively pushing many middle- and upper-income earners into higher tax percentages for the same level of real income. For example, the current 12% bracket will revert to 15%, and the 24% bracket will revert to 28%.
Standard Deduction vs. Personal Exemptions
The TCJA nearly doubled the standard deduction while eliminating personal exemptions. In 2026, the standard deduction will be roughly halved (adjusted for inflation). To compensate, personal exemptions—which were $4,050 per person in 2017—will return. For large families, this might be a neutral or even positive change, but for single filers and couples with fewer dependents, it could result in a higher taxable income base.
The SALT Cap and Itemized Deductions
One of the most controversial elements of the TCJA was the $10,000 cap on State and Local Tax (SALT) deductions. This cap is set to expire, which is good news for taxpayers in high-tax states like California, New York, and New Jersey. However, the overall return of the "Pease limitation," which reduces the value of itemized deductions for high-income earners, may offset some of these gains.
The Estate and Gift Tax Cliff: A 'Use It or Lose It' Moment
For high-net-worth individuals, the most pressing concern is the sunset of the enhanced federal estate and gift tax exemption. Under the TCJA, the exemption amount was doubled. In 2024, an individual can transfer up to $13.61 million ($27.22 million for married couples) during their lifetime or at death without triggering federal estate taxes. In 2026, this exemption is expected to drop to approximately $7 million per person, adjusted for inflation.
Strategic Gifting Strategies
This creates a "use it or lose it" scenario. The IRS has clarified in "anti-clawback" regulations that taxpayers who utilize the increased exemption before 2026 will not be penalized when the exemption drops. Strategic planning may involve:
- Large gifts to Irrevocable Life Insurance Trusts (ILITs).
- Establishing Spousal Lifetime Access Trusts (SLATs) to move assets out of the taxable estate while maintaining some indirect access to the funds.
- Utilizing Grantor Retained Annuity Trusts (GRATs) to transfer appreciation on assets to heirs tax-free.
Impact on Business Owners: The Section 199A Deduction
Small business owners and partners in pass-through entities (S-Corps, LLCs, Partnerships) have benefited immensely from the Section 199A Qualified Business Income (QBI) deduction. This provision allows eligible taxpayers to deduct up to 20% of their qualified business income from their taxes. This deduction is scheduled to vanish entirely in 2026.
For business owners, this represents a 20% increase in taxable income from their operations. Planning for this may involve reconsidering entity structures (such as converting to a C-Corp if the corporate tax rate remains lower than individual rates) or accelerating income into 2024 and 2025 to maximize the deduction while it remains available.
Actionable Strategies for the 2024-2025 Transition
With the sunset approaching, taxpayers should consult with their financial and tax advisors to implement specific maneuvers. Waiting until late 2025 may be too late, as many legal and financial instruments take time to establish.
1. Roth Conversions
Because tax rates are currently at historic lows, now is an ideal time to consider Roth IRA conversions. Paying the tax at today’s 24% or 37% rate may be significantly cheaper than paying at 28% or 39.6% in the future. Furthermore, Roth IRAs grow tax-free and are not subject to Required Minimum Distributions (RMDs) during the original owner's lifetime.
2. Accelerating Income and Deferring Deductions
The traditional tax advice is to defer income and accelerate deductions. The looming sunset flips this logic on its head. If you expect to be in a higher tax bracket in 2026, it may be beneficial to accelerate bonuses, exercise stock options, or pull forward business income into 2025. Conversely, you might defer large charitable contributions or medical expenses until 2026, when they will provide a more valuable deduction against higher tax rates.
3. Re-evaluating Charitable Giving
With the standard deduction set to decrease, more taxpayers will likely find themselves itemizing again in 2026. Strategic use of Donor-Advised Funds (DAFs) can allow taxpayers to "bunch" contributions. You might contribute heavily to a DAF in 2025 to secure a deduction under the current rules, or wait until 2026 if the deduction will offset a higher tax rate.
The Role of the Alternative Minimum Tax (AMT)
The TCJA significantly increased the AMT exemption and the phase-out thresholds, which meant far fewer middle- and upper-middle-class taxpayers were hit by this "parallel" tax system. When these provisions sunset, the AMT will once again become a major factor for many taxpayers, particularly those with high state taxes or those exercising incentive stock options (ISOs). Planning for AMT liability will be essential for those who haven't had to worry about it since 2017.
Conclusion: Proactive Planning is Paramount
The 2026 TCJA sunset is not a surprise, but it is a complex transition that requires foresight. While there is always a possibility that Congress will pass legislation to extend some of these provisions, banking on political certainty is a risky strategy. By treating the 2026 sunset as a certainty, taxpayers can lock in the benefits of the current low-rate environment and protect their wealth for the long term.
Tax planning is not a one-time event but an ongoing process. Now is the time to model your 2026 tax liability under the old rules and compare it to your current situation. Whether it is through aggressive gifting, Roth conversions, or restructuring business operations, taking action today can save thousands, or even millions, of dollars in the years to come.