The Tax Cuts and Jobs Act (TCJA) of 2017 stands as the most significant overhaul of the U.S. tax code in more than three decades. Signed into law in December 2017, the legislation reduced individual income tax rates, nearly doubled the standard deduction, lowered the corporate tax rate from 35% to 21%, and introduced a new qualified business income deduction for pass-through entities. For individuals, small business owners, and large corporations alike, the Tax Cuts and Jobs Act reshaped tax planning strategies in fundamental ways that continue to influence financial decisions today.
This article answers one core question: which TCJA provisions matter most for individuals and business owners, and how should they shape your tax planning? The full text and summaries of the law are published by the U.S. Congress and the IRS Tax Reform resource center.
Pease Bell’s tax professionals first examined these changes during a February 2018 “Tax Talk” webinar designed to give clients and colleagues an accessible, practical look at the new rules. The analysis below builds on the insights shared in that session and offers an updated perspective on the provisions that matter most to taxpayers and business owners.
How the TCJA changed individual income tax rates
The Tax Cuts and Jobs Act restructured the seven individual income tax brackets, lowering rates across most levels. The top marginal rate dropped from 39.6% to 37%, while the 25% bracket fell to 22% and the 15% bracket dropped to 12%. These rate reductions were designed to put more after-tax income in the hands of wage earners at nearly every level.
Equally significant was the near-doubling of the standard deduction. For tax year 2018, the standard deduction rose to $12,000 for single filers and $24,000 for married couples filing jointly, up from $6,350 and $12,700, respectively. That increase prompted millions of taxpayers who had previously itemized their deductions to switch to the standard deduction instead, simplifying their returns but also reducing the tax benefit of charitable contributions and mortgage interest for many households.
The personal exemption, which had allowed taxpayers to claim $4,050 per household member, was eliminated entirely. For larger families, the loss of personal exemptions partially offset the benefit of the higher standard deduction. To compensate, the TCJA expanded the Child Tax Credit from $1,000 to $2,000 per qualifying child and raised the income phase-out thresholds.
What the TCJA means for business tax planning
The corporate tax rate reduction from 35% to 21% was perhaps the most headline-grabbing provision of the Tax Cuts and Jobs Act. The change made the U.S. corporate rate more competitive internationally and gave C corporations a permanent, significant reduction in their federal tax burden.
For pass-through businesses, including S corporations, partnerships, and sole proprietorships, the TCJA introduced a new Section 199A qualified business income (QBI) deduction. Eligible owners can deduct up to 20% of their qualified business income, effectively lowering their top tax rate on that income from 37% to 29.6%. The deduction comes with limitations based on wages paid, capital invested, and the type of business, particularly for specified service trades or professions above certain income thresholds. Choosing the right entity structure to capture this benefit is a question our tax advisory services team helps owners work through each year.
Small business owners also benefited from expanded expensing rules. The TCJA increased the Section 179 expensing limit to $1 million (up from $510,000) and expanded bonus depreciation to 100% for qualified property placed in service after September 27, 2017. These changes allowed businesses to write off the full cost of equipment, machinery, and certain improvements in the year of purchase rather than depreciating them over time. Capital-intensive sectors such as manufacturing and construction saw some of the largest planning opportunities from these expensing rules.
Changes to business interest deductions
The TCJA placed a new cap on business interest expense deductions under Section 163(j). For businesses with average annual gross receipts exceeding $25 million, the deduction for net interest expense was limited to 30% of adjusted taxable income. This provision affected highly leveraged companies and real estate developers, though certain real estate businesses could elect out of the limitation. The IRS published detailed guidance on the rules in its questions and answers on the Section 163(j) limitation.
TCJA provisions affecting state and local taxes
One of the most debated changes under the Tax Cuts and Jobs Act was the $10,000 cap on the state and local tax (SALT) deduction. Before the TCJA, taxpayers who itemized could deduct the full amount of their state and local income, sales, and property taxes from their federal taxable income. The new cap hit taxpayers in high-tax states hardest, particularly New York, New Jersey, California, and Connecticut.
The SALT cap fundamentally altered the tax calculus for homeowners in these states. Combined with the higher standard deduction, it reduced the number of taxpayers who benefit from itemizing and increased the effective federal tax burden on residents of high-tax jurisdictions. This provision remains one of the most politically contentious elements of the TCJA and has been a recurring topic in subsequent legislative debates.
How the TCJA reshaped estate and gift tax rules
The Tax Cuts and Jobs Act doubled the estate and gift tax exemption amount from approximately $5.49 million per individual to $11.18 million (indexed for inflation). By 2025, the inflation-indexed exemption had risen to $13.99 million per person, effectively removing the vast majority of estates from federal estate tax exposure.
This change created a window for high-net-worth individuals to transfer significant wealth during their lifetimes without incurring federal gift or estate tax. Estate planning professionals worked with clients to take advantage of the higher exemption through strategies like irrevocable trusts, grantor retained annuity trusts, and outright gifts.
TCJA expiration and what taxpayers should plan for
Many of the individual provisions in the Tax Cuts and Jobs Act were set to expire after December 31, 2025. These sunset provisions included the lower individual income tax rates, the higher standard deduction, the expanded child tax credit, and the increased estate tax exemption. The corporate tax rate reduction to 21%, by contrast, was made permanent.
The scheduled expiration created urgency for tax planning, and Congress took action to extend many provisions. Regardless of the legislative outcome, the TCJA’s influence on tax strategy has been profound, touching retirement account contributions, business entity selection, and estate planning. Business owners and individuals should review their tax positions regularly with a qualified CPA to ensure their strategies account for current law and potential changes.
Why ongoing tax planning matters after the TCJA
Tax preparation and planning remain essential components of a sound financial strategy. The Tax Cuts and Jobs Act introduced complexity alongside its rate reductions, and the interaction between federal and state tax rules requires careful analysis. Pease Bell’s tax advisory professionals work with clients year-round to ensure their tax plans reflect current law, optimize available deductions, and align with long-term financial goals. Our broader accounting services connect that tax planning to bookkeeping, financial reporting, and entity-level decisions.
Whether you are a business owner evaluating your entity structure, an individual weighing the standard deduction against itemizing, or a family planning wealth transfers across generations, the changes introduced by the TCJA continue to shape the decisions that matter. For more information and a consultation, contact Pease Bell.
Frequently Asked Questions
What is the Tax Cuts and Jobs Act of 2017?
The Tax Cuts and Jobs Act (TCJA) is a federal tax reform law signed in December 2017 that reduced individual and corporate tax rates, nearly doubled the standard deduction, eliminated personal exemptions, and introduced a qualified business income deduction for pass-through entities. It represents the largest overhaul of the U.S. tax code since 1986.
How did the TCJA change the standard deduction?
The TCJA nearly doubled the standard deduction to $12,000 for single filers and $24,000 for married couples filing jointly, starting in tax year 2018. This increase caused millions of taxpayers to stop itemizing their deductions, simplifying their returns but reducing the tax benefit of deductions like mortgage interest and charitable contributions.
What is the Section 199A qualified business income deduction?
Section 199A allows owners of pass-through businesses, including S corporations, partnerships, and sole proprietorships, to deduct up to 20% of their qualified business income from their taxable income. The deduction is subject to limitations based on taxable income, wages paid by the business, and whether the business is a specified service trade or profession.
Did the Tax Cuts and Jobs Act expire?
Many individual provisions of the TCJA were originally set to sunset after December 31, 2025, including the lower individual tax rates, the higher standard deduction, and the expanded estate tax exemption. The corporate tax rate reduction to 21% was made permanent. Congress has taken steps to address the expiring provisions through subsequent legislation.
How does the SALT deduction cap affect taxpayers?
The TCJA capped the state and local tax (SALT) deduction at $10,000 per return. Before the cap, taxpayers who itemized could deduct their full state and local income, sales, and property taxes. The cap primarily affects taxpayers in high-tax states like New York, California, and New Jersey, increasing their effective federal tax burden.
How did the TCJA affect small business tax planning?
The TCJA benefited small businesses through the new 20% qualified business income deduction, expanded Section 179 expensing (raised to $1 million), and 100% bonus depreciation on qualified property. These provisions allowed small business owners to lower their effective tax rates and accelerate deductions for equipment and capital investments.
