Trump Tax Cuts Extension 2026: TCJA Provisions, What Changed, and Your Take-Home Pay

The Tax Cuts and Jobs Act of 2017 was the most significant overhaul of the US tax code in three decades. For individuals, many of its provisions were set with a sunset clause — expiring after December 31, 2025 — creating what tax professionals called the 'TCJA cliff.' Without legislative action, individual tax rates, the standard deduction, the SALT cap, the pass-through deduction, and the estate tax exemption would all revert to pre-2017 levels in 2026. The political stakes were enormous.

The 'One Big Beautiful Bill' — the 2025 reconciliation legislation — extended the core TCJA individual provisions, averting the cliff for most taxpayers. This guide explains what was in the TCJA, what the extension preserves, where changes were made, and what it all means for your 2026 take-home pay. Whether you're an employee, business owner, or high-net-worth individual planning your estate, the TCJA extension has material implications.

What Was the TCJA and Why Did It Matter

The Tax Cuts and Jobs Act (Public Law 115-97) was signed by President Trump on December 22, 2017. For individuals and pass-through businesses, most provisions were temporary, set to expire after December 31, 2025. For corporations, the TCJA provisions were permanent — including the flat 21% corporate income tax rate (down from 35%).

Key TCJA individual provisions that were set to expire:

• Lower individual tax rates: TCJA reduced the top rate from 39.6% to 37% and reduced rates across most other brackets. Without extension, rates would revert to pre-2017 levels.
• Higher standard deduction: TCJA roughly doubled the standard deduction. Without extension, it would revert to approximately half the 2025 amount.
• $10,000 SALT cap: TCJA capped the deduction for state and local taxes at $10,000. Without extension, this cap would disappear — benefiting high-tax state residents who itemise.
• Section 199A deduction: A 20% deduction on qualified business income (QBI) for pass-through businesses. Without extension, this deduction disappears entirely.
• Doubled estate tax exemption: TCJA doubled the basic exclusion amount. Without extension, it would roughly halve from ~$14M to ~$7M per person.
• Child tax credit: TCJA increased the child tax credit from $1,000 to $2,000 and expanded refundability.

What the 2026 Extension Preserves: Key Provisions

The reconciliation bill extended the following core TCJA provisions for individual taxpayers:

The extension largely maintains the tax landscape that US taxpayers have known since 2018, providing certainty for financial planning decisions that had been in limbo as the TCJA sunset approached.

Individual Tax Rate Changes Under TCJA Extension

The TCJA restructured individual tax brackets, and the extension maintains this structure with annual inflation adjustments. For 2026, the estimated brackets for single filers are:

Under pre-TCJA rates, a high earner at $500,000 income would have faced a 39.6% marginal rate. Under the extended TCJA, they face 35%. The tax saving on income above $418,000 is 4.6 cents per dollar — meaningful for high earners, but the TCJA's biggest tax cuts were for middle-income earners who benefited most from the bracket restructuring and expanded standard deduction.

Standard Deduction vs Itemising in 2026

One of the TCJA's most impactful changes was the near-doubling of the standard deduction, which dramatically reduced the number of Americans who benefit from itemising. The TCJA extension maintains this structure:

• The standard deduction for 2026 is approximately $15,000 (single) and $30,000 (married filing jointly), indexed for inflation from the TCJA base.
• To benefit from itemising, your total itemised deductions (mortgage interest, state/local taxes up to $10,000, charitable contributions, medical expenses above 7.5% AGI threshold) must exceed the standard deduction amount.
• Under the original TCJA, approximately 90% of filers now claim the standard deduction — up from about 70% pre-TCJA.

High-value itemised deductions include:

• Mortgage interest: On loans up to $750,000 (TCJA limit, maintained). Pre-TCJA was $1M.
• State and local taxes (SALT): Capped at $10,000 (federal deduction only — this is the 'SALT cap').
• Charitable contributions: Up to 60% of AGI for cash donations (TCJA increased from 50%).
• Medical expenses: Above 7.5% of AGI.

SALT Cap: $10,000 Limit Remains — Impact on High-Tax States

The $10,000 State and Local Tax (SALT) deduction cap is one of the most politically contentious TCJA provisions, particularly for residents of high-tax states like California, New York, New Jersey, Illinois, and Massachusetts.

How the SALT cap affects high earners:

• A New York City resident paying $25,000 in state and local taxes can only deduct $10,000 federally — losing the benefit of $15,000 in taxes paid.
• At a 35% marginal rate, this $15,000 of non-deductible SALT translates to approximately $5,250 in additional federal tax compared to a pre-TCJA scenario.
• For California residents in the 37% bracket, the impact is even more significant — California has the highest state income tax rate at 13.3%, generating large SALT deductions that are now capped.

The SALT cap was widely viewed as a political move penalising states that typically vote Democrat. Congressional representatives from New York, New Jersey, and California repeatedly attempted to repeal or increase the cap. The extension legislation maintained the $10,000 cap, meaning residents of high-tax states continue to bear this relative disadvantage.

One planning strategy: for those who itemise significantly above the SALT cap — primarily upper-income residents of high-tax states — considering relocation to a no-income-tax state (Texas, Florida, Nevada, Wyoming) can generate both state tax savings and improved federal deductibility of remaining SALT amounts.

Pass-Through Business Deduction (Section 199A) Extended

Section 199A — the 20% deduction on Qualified Business Income (QBI) for pass-through businesses — is one of the most valuable provisions in the TCJA for business owners, and the extension preserves it.

Who benefits from Section 199A:

• Sole proprietors, freelancers, and self-employed individuals with a Schedule C business.
• Partners in partnerships with pass-through income.
• S corporation shareholders receiving pass-through income.
• Rental real estate owners who meet safe harbor conditions under Rev. Proc. 2019-38.

How it works: If you have $200,000 of qualified business income, you can deduct $40,000 (20%) — reducing your federal taxable income by $40,000. At the 24% marginal rate, this saves $9,600 in federal tax.

Limitations and phase-outs:

• For Specified Service Trades or Businesses (SSTBs) — lawyers, doctors, consultants, financial advisors — the deduction phases out once taxable income exceeds $197,300 (single) or $394,600 (MFJ) in 2026 (approximate, indexed).
• The deduction is also limited to 50% of W-2 wages paid by the business, or 25% of W-2 wages plus 2.5% of qualified property — preventing sole proprietors with high income but no employees from claiming unlimited deductions.

What This Means for Your 2026 Paycheck

For most salaried employees, the TCJA extension means no change in withholding or take-home pay relative to 2025 — the same rates, same standard deduction, same AMT thresholds. The extension was designed to preserve continuity rather than create new tax changes.

However, there are important nuances:

• Inflation adjustments continue: Even with the TCJA extended, all dollar amounts are adjusted annually for inflation. The 2026 brackets, standard deduction, and other thresholds will be slightly higher than 2025 due to inflation indexing.
• High earners in high-tax states: The maintained SALT cap continues to cost high earners in California, New York, and New Jersey an effective extra $5,000-$10,000+ in federal tax annually compared to low-tax state residents.
• Business owners: The 199A deduction continuation is a significant win — potentially worth tens of thousands of dollars annually for successful self-employed individuals and pass-through business owners.
• Estate planning: The maintained high exemption (~$13.99M per person, portability preserved) means only the very largest estates face federal estate tax. Those who accelerated gifting in anticipation of the exemption halving can relax.

The TCJA extension removes the largest source of tax uncertainty for 2026 planning. The focus for most individuals now shifts back to income management, retirement contributions, and state-level tax optimisation rather than navigating TCJA cliff scenarios.