Tax Sunsets and Sunrises: Navigating the Post-TCJA Landscape
Published: 2026-01-25 • Estimated reading time: 8 min
I just got off the phone with a client—a sharp founder of a nine-figure logistics company—and the panic in his voice was palpable. "Winn," he said, "my tax advisor just walked me through our preliminary 2026 liability. It feels like someone reached into our bank account and just took an extra 15%. What happened?" What happened is that the great tax holiday of the last eight years is officially over. The Tax Cuts and Jobs Act of 2017 (TCJA) has sunset, and the financial playbook that got you here is now a historical document. This isn't just about a few percentage points; it's a fundamental shift in the landscape requiring a new level of financial risk management.
My team and I have spent the last 18 months modeling this exact scenario. The CEOs who are breathing easy today are the ones who stopped treating tax strategy as a year-end cleanup project and started treating it as a core component of their business operations. The ones who are panicking? They're learning a brutal lesson about fiscal policy changes: the government gives, and the government takes away.
The New Normal: Why Your 2025 Playbook Failed
Your 2025 financial playbook is obsolete because the foundational assumptions it was built on—specifically the individual and pass-through tax benefits of the TCJA—evaporated on January 1, 2026. We've reverted to a modified version of the pre-2018 tax code, with higher individual rates, a lower estate tax exemption, and the disappearance of several key business deductions that you likely took for granted.
It’s a story of impermanence. The TCJA was a massive piece of legislation that temporarily rewrote the rules. For businesses, one of the most significant changes was the introduction of 100% bonus depreciation, allowing companies to immediately write off the full cost of eligible assets, as noted by Plante Moran. That provision began phasing out after 2022 and is now a memory. The big corporate rate cut from 35% to 21% for C-Corps was made permanent, but for the vast majority of private businesses structured as pass-through entities, the real magic was in the individual-side provisions that have now vanished.
Think about it: individual tax brackets snapped back, with the top rate climbing from 37% back to 39.6%. The generous $10,000 SALT (State and Local Tax) deduction cap, while frustrating, is now interacting with these higher federal rates, compounding the pain. The Alternative Minimum Tax (AMT), a ghost many thought was banished, has returned to haunt high-income households. Your entire approach to financial risk management must now account for this less favorable environment.
Section 199A and the Pass-Through Entity Crisis
The expiration of Section 199A represents the single largest tax increase for owners of S-Corps, LLCs, and partnerships in over a decade. This provision, also known as the Qualified Business Income (QBI) deduction, allowed owners of pass-through businesses—which account for over 90% of all U.S. businesses according to some analyses—to deduct up to 20% of their qualified business income, a benefit that disappeared overnight.
This isn't a minor tweak. For a business owner with $2 million in QBI, that deduction was worth a potential $400,000 reduction in their taxable income. At a 37% tax rate, that's a cash-in-pocket savings of $148,000. Now, that cash is simply gone. It flows directly to the Treasury, and directly out of your company's working capital or your personal net worth. The impact of this on your corporate tax strategy cannot be overstated.
Here's a simplified look at the jarring reality:
The Resurgence of SALT Cap Workarounds
With the loss of the QBI deduction, the focus of sophisticated tax planning has shifted dramatically to mitigating the still-present $10,000 SALT deduction cap. The most powerful tool here is the Pass-Through Entity Tax (PTET). This is a state-level election that allows the S-Corp or partnership to pay state income tax at the entity level, which is fully deductible for the business. This, in turn, reduces the federal taxable income that flows through to the owners. While not a new strategy, its value has skyrocketed. My team at Greenwood has found that for clients in high-tax states, a properly executed PTET election can claw back 30-50% of the damage done by the 199A sunset.
Strategic Deferrals and Accelerations: A Delicate Balance
Effective tax liability modeling now hinges on meticulously managing the timing of income and expenses to align with the new, higher-rate reality. While the old game was often about deferring income into potentially lower-taxed future years, the script has flipped. Now, you must navigate a minefield of changing rules around interest deductibility, R&D expenses, and capital gains to protect your cash flow.
It's like what one of my sharpest colleagues often says:
"In tax planning, timing isn't just one thing; it's everything. The calendar is your most powerful, and most unforgiving, tool."
The business interest expense limitation under Section 163(j), for instance, has become more restrictive. The calculation no longer allows for the add-back of depreciation and amortization, severely limiting interest deductions for capital-intensive businesses. According to the Tax Policy Center, this was one of the key base-broadening provisions of the TCJA designed to help pay for the rate cuts. Now, you have the restrictive rule without the full benefit of the pass-through deductions.
Similarly, the mandate to amortize R&D expenses over five years (under Section 174) instead of expensing them immediately remains a major cash flow drain for innovative companies. A business spending $1 million on R&D now only gets a $200,000 deduction in year one, not the full $1 million. That's an $800,000 swing in taxable income—a massive, and often unexpected, hit.
The CFO's Role: Translating Tax Law into Cash Flow Reality
A CFO's primary role in this new environment is to act as the strategic hub, translating abstract fiscal policy changes into concrete impacts on the company's P&L and balance sheet. This is where a proactive Fractional CFO can be invaluable. They are no longer just closing the books; they are engaging in aggressive Tax Liability Modeling and building a resilient corporate tax strategy that anticipates, rather than reacts to, legislative shifts.
The modern CFO, or Fractional CFO, must quarterback the relationship between the CEO, the company's tax counsel, and its wealth advisors. They ensure that the business entity structure (S-Corp vs. C-Corp), the owner's personal tax situation, and the company's operational cash needs are all in sync. For example, with the pass-through advantage shrinking, is it finally time to consider a C-Corp conversion? That's not just a tax question; it's a strategic business decision with implications for future fundraising, M&A activity, and shareholder distributions. A CFO is the one to model that out and present a clear, data-backed recommendation.
Actionable Steps for Q1 2026
This is not a time for passive observation. The financial ground has shifted, and you need to move with it. Here are the five things my team is telling every single client to do right now:
Re-run Your Projections Immediately. Your 2026 budget and cash flow forecast, finalized last quarter, are wrong. You must re-model them using the post-TCJA tax assumptions to understand your new reality. The difference is your immediate financial risk management challenge.
Model an Entity Structure Review. The math supporting your S-Corp or LLC election has fundamentally changed. A C-Corp structure, with its flat 21% federal tax rate, may now be more advantageous, despite the issue of double taxation. You need to see the numbers for your specific situation.
Maximize State-Level Workarounds. Schedule a call with your tax advisor this week to discuss a PTET election if you're in a state that offers it. This is one of the few levers left to meaningfully reduce your federal tax burden.
Re-evaluate Capital Expenditure Plans. With the loss of generous depreciation rules and tighter interest deductibility, the ROI on major capital projects needs to be re-analyzed through a new tax lens. A project that made sense in 2025 might be a cash-flow negative in 2026.
Stress-Test Owner Compensation and Distributions. The amount of cash you need to distribute to owners to cover their higher personal tax liabilities has increased significantly. Ensure your operating cash flow can support these larger distributions without starving the business of growth capital.
We are in a new era of tax complexity. The easy wins are gone. Success from here on will be defined not by the market you're in, but by the sophistication of your financial strategy.
Frequently Asked Questions
How does the TCJA sunset affect S-Corp and LLC owners in 2026?
The TCJA sunset dramatically increases the tax burden on S-Corp and LLC owners primarily by eliminating the 20% Qualified Business Income (QBI) deduction under Section 199A. This, combined with the reversion of individual income tax rates to higher pre-TCJA levels, means owners will pay a significantly higher effective tax rate on the profits that pass through to them.
What immediate steps should CEOs take to mitigate increased tax liabilities?
CEOs should immediately work with their financial team to re-forecast their 2026 tax liability and cash flow, model the pros and cons of their current business entity structure, and aggressively pursue state-level tax mitigation strategies like the Pass-Through Entity Tax (PTET) election to counteract the loss of federal deductions.
How can a Fractional CFO coordinate with tax counsel for better outcomes?
A Fractional CFO acts as the strategic liaison, translating the CEO's business goals into financial data that tax counsel can use to provide legal and structural advice. They can model different scenarios (e.g., C-Corp vs. S-Corp, asset purchase vs. lease, compensation strategies) to quantify the cash-flow impact of various tax strategies, ensuring the final plan is both tax-efficient and operationally sound.
