How Much Will My Taxes Go Up If TCJA Expires in 2026

By Morgan Hayes | Published: January 2025 | Tax Cuts Calculator Editorial Team

Legal Disclaimer: This article is for informational purposes only and should not be considered tax advice. Please consult with a qualified tax professional or certified public accountant before making any tax-related decisions. Tax laws are subject to change, and individual circumstances vary significantly.

Picture this: It's April 2026, and you're preparing your taxes. Your paycheck looks the same, but your tax bill has jumped by thousands of dollars. Your standard deduction has shrunk. Your tax bracket has crept upward. The child tax credit you've relied on is smaller. This isn't a hypothetical scenario—it's what millions of Americans could face if Congress doesn't act before the end of 2025. The Tax Cuts and Jobs Act (TCJA), signed into law in December 2017, fundamentally reshaped American taxation for the past seven years. But here's the catch: most of its individual income tax provisions are set to expire on December 31, 2025, potentially triggering the largest automatic tax increase in recent history. Understanding what's coming is essential for informed financial planning.

Understanding the TCJA Expiration Timeline and Current Congressional Status

When Congress passed the TCJA in 2017, lawmakers made a critical strategic decision: they wrote an expiration date into the law. Most individual income tax provisions sunset after December 31, 2025, while corporate tax cuts were made permanent. Why? The answer lies in budget reconciliation rules. By making individual provisions temporary, Congress used a procedural workaround that allowed the bill to pass with a simple majority vote (51 senators) rather than requiring a 60-vote supermajority.

According to the Congressional Budget Office (CBO), allowing the TCJA to expire would increase federal revenues by approximately $1.5 trillion over ten years—but at a significant cost to individual taxpayers and families.

Current Congressional Activity (as of January 2025):

• Republican-controlled Congress is prioritizing TCJA extension through tax reform legislation
• Proposed bills include making individual provisions permanent or extending them through 2033
• Democrats have expressed interest in partial extensions with modifications to high-income provisions
• Extension legislation typically moves quickly early in a congressional session, but final passage is uncertain

The critical timeline: Congress must act before December 31, 2025, or the expiration becomes effective for the 2026 tax year. Most tax professionals expect legislative action, but betting your financial plan on it would be risky.

Tax Changes You'll Face in 2026 If TCJA Expires: Specific Numerical Examples

Let's move beyond abstract discussion and examine concrete numbers. Here's what changes if the TCJA expires without extension:

Tax Bracket Changes:

The TCJA compressed and lowered tax brackets across all income levels. The 37% top rate replaced 39.6%. If these provisions expire, rates revert to 2017 levels:

• Top rate: 37% (TCJA) → 39.6% (2026 without extension)
• Upper-middle rate: 35% (TCJA) → 36% (2026)
• Middle bracket: 24% (TCJA) → 28% (2026)
• Lower-middle bracket: 12% (TCJA) → 15% (2026)

Standard Deduction Impact:

The TCJA roughly doubled the standard deduction. For 2025, these amounts are:

• Single filer: $14,600 (TCJA-era)
• Married filing jointly: $29,200 (TCJA-era)
• Head of household: $21,900 (TCJA-era)

If the TCJA expires, the 2026 standard deduction would drop to approximately 2017 levels—roughly 50% lower. This means a married couple would deduct approximately $14,600 instead of $29,200, increasing taxable income substantially.

Sample Taxpayer Impact Analysis:

Note: These estimates use simplified 2025 tax data and assume no other income or deductions. Actual impacts vary based on individual circumstances. Source: Tax Foundation analysis of TCJA provisions.

Child Tax Credit Reduction:

The TCJA doubled the child tax credit from $1,000 to $2,000 per child. If it expires, families lose this enhancement. For a family with three children, that's a potential $3,000 reduction in tax credits—meaning $3,000 less in tax relief.

Other Expiring Provisions:

• Increased Section 179 expensing limits for small businesses
• Enhanced deductions for pass-through business income (20% QBI deduction expires)
• Expanded child and dependent care credit modifications
• Modifications to student loan interest deductions
• Increased charitable giving deduction provisions

Tax Planning Strategies and Mitigation Options for 2026

While uncertainty about Congressional action persists, proactive taxpayers can implement strategies now to minimize potential 2026 tax increases:

Immediate Actions (2025):

• Accelerate income: Consider realizing gains or bonuses in 2025 while lower TCJA rates apply
• Defer deductions: Hold off on charitable contributions until 2026 if you expect higher deductions to be beneficial
• Max retirement contributions: Contribute to 401(k)s and IRAs before year-end to reduce taxable income while TCJA rates exist
• Review estimated tax payments: Adjust 2026 quarterly payments upward based on potential rate increases
• Business owners: Accelerate business income recognition in 2025 to capture the 20% QBI deduction

Official Resources for Tax Planning:

The Internal Revenue Service (IRS) publishes detailed