OBBB’s Impact on Section 199A: What Pass-Through Business Owners Should Expect

Section 199A remains one of the most valuable tax deductions available to pass-through business owners. After the One Big Beautiful Bill Tax Laws passed July 4, 2025, many entrepreneurs are reassessing how the deduction applies to their businesses. According to Greg O’Brien, CPA at Anomaly CPA, owners of S corporations, partnerships, and sole proprietorships must evaluate how wages, capital investment, and income thresholds affect their eligibility for section 199A. Businesses that incorporate structured planning through advanced tax strategy often preserve larger deductions while staying compliant. The deduction allows qualifying owners to deduct up to 20% of qualified business income from their taxable income (Source: Internal Revenue Code §199A(a)). As IRS enforcement increases, understanding the deduction’s calculation rules and limitations can help business owners protect substantial tax savings heading into 2026. 

What section 199A allows business owners to deduct

Section 199A provides a tax deduction for owners of pass-through businesses who report profits on their individual tax returns.

Definition — Internal Revenue Code §199A Qualified Business Income Deduction

Internal Revenue Code §199A allows eligible taxpayers to deduct up to 20% of qualified business income (QBI) from certain pass-through entities, including S corporations, partnerships, and sole proprietorships. The deduction applies to domestic business income and may be limited by income thresholds, wages paid by the business, and qualified business property.

The deduction was originally created under the Tax Cuts and Jobs Act of 2017 to provide tax relief to non-corporate businesses.

Because the deduction applies directly to business profits, it can significantly lower the effective tax rate for profitable companies.

Key takeaway: Section 199A allows many pass-through businesses to deduct up to 20% of qualified business income, creating a major tax planning opportunity. 

How the One Big Beautiful Bill affects section 199A

The One Big Beautiful Bill (OBBB) enacted in 2025 reinforced compliance requirements tied to the deduction.

The legislation did not eliminate the deduction but clarified documentation requirements for calculating qualified business income, wages, and qualified property.

When taxable income exceeds IRS thresholds, the deduction becomes subject to wage and capital limitations.

The deduction may be limited to the greater of:

• 50% of W-2 wages paid by the business

• 25% of W-2 wages plus 2.5% of qualified business property

These limitation formulas are defined directly within the statute governing the deduction.

(Source: Internal Revenue Code §199A(b)(2)).

These rules encourage businesses to employ workers or invest in capital assets.

Key takeaway: OBBB reinforced existing calculation rules, making documentation and wage planning more important for preserving the deduction. 

Which businesses benefit most from section 199A

Businesses with employees or capital assets often preserve more of the deduction once income rises.

Companies with strong profits but minimal payroll may face deduction limitations once taxable income exceeds statutory thresholds.

For specified service trades or businesses (SSTBs) such as consulting firms, legal practices, and financial advisory businesses, the deduction may phase out once income exceeds IRS limits.

For 2025 tax years, phaseout thresholds begin around $383,900 for married filers and $191,950 for single filers (Source: IRS Rev. Proc. 2024-40).

These thresholds adjust annually for inflation.

Strategic entity structure, payroll planning, and asset investment often determine how much of the deduction remains available.

Key takeaway: Businesses with payroll expenses and capital assets generally retain a larger portion of the section 199A deduction at higher income levels. 

Real-world example: calculating a section 199A deduction

Consider a marketing agency structured as an S corporation.

The business generates $600,000 in qualified business income and pays $200,000 in W-2 wages.

Under section 199A, the owner may initially qualify for a 20% deduction, equal to $120,000 (Source: Internal Revenue Code §199A(a)).

However, wage limitations apply.

The wage limitation equals 50% of W-2 wages, or $100,000 (Source: Internal Revenue Code §199A(b)(2)).

Because the limitation is lower than the calculated deduction, the allowable deduction becomes $100,000 instead of $120,000.

Assumptions:

Income and payroll figures reflect common structures among professional service firms (Based on anonymized Anomaly CPA client data, Q4 2024).

Key takeaway: Wage limitations can reduce the deduction, making payroll planning an important part of section 199A strategy. 

Why documentation and planning matter more in 2026

The IRS has increased enforcement efforts focused on complex deductions and pass-through tax benefits.

Section 199A claims require accurate documentation of qualified business income, payroll records, and qualified property values.

Errors in calculation can lead to deduction adjustments or audit scrutiny.

Business owners who conduct annual tax planning reviews often discover opportunities to increase allowable deductions.

Planning strategies may include adjusting payroll levels, restructuring entity ownership, or evaluating capital investments.

Key takeaway: Strong documentation and proactive tax planning help protect the section 199A deduction as enforcement increases. 

Frequently asked questions about section 199A

What is section 199A?

Section 199A allows eligible pass-through businesses to deduct up to 20% of qualified business income from taxable income (Source: Internal Revenue Code §199A).

Which businesses qualify for the section 199A deduction?

S corporations, partnerships, and sole proprietorships with qualified business income may qualify if their income falls within IRS eligibility thresholds.

How does payroll affect the section 199A deduction?

At higher income levels, the deduction may be limited to 50% of W-2 wages or 25% of wages plus 2.5% of qualified business property (Source: Internal Revenue Code §199A(b)(2)).

Do service businesses lose the section 199A deduction?

Specified service trades or businesses may experience a phaseout once taxable income exceeds IRS thresholds (Source: IRS Rev. Proc. 2024-40). 

Action steps for business owners

●      Review qualified business income calculations annually.
●      Maintain accurate W-2 payroll documentation.
●      Track qualified business property used in deduction calculations.
●      Evaluate entity structure to support tax efficiency.
●      Conduct an annual section 199A tax strategy review with a CPA.