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Section 199A Qualified Business Income Deduction

A tax provision allowing up to a 20% deduction on qualified business income for owners of pass-through entities (S-Corps, partnerships, sole proprietorships), subject to income limitations and business type restrictions.

Regulation Source: Billionaire Wealth Strategies Verified: 2026-04-07

Definition

Section 199A of the Internal Revenue Code allows owners of pass-through entities to deduct up to 20% of their qualified business income (QBI). This effectively reduces the top federal marginal tax rate on business income from 37% to 29.6%. The deduction applies to S-Corporations, partnerships, LLCs taxed as partnerships, and sole proprietorships.

How It Works

The deduction is calculated as the lesser of 20% of QBI or 20% of taxable income (before the QBI deduction). For higher-income taxpayers, the deduction is subject to limitations based on W-2 wages paid by the business and the unadjusted basis of qualified property.

Specified Service Trades or Businesses (SSTBs), including law, accounting, consulting, financial services, and healthcare, face additional restrictions. Above certain income thresholds ($191,950 single / $383,900 married filing jointly for 2025), SSTB owners see the deduction phased out entirely.

Non-SSTB businesses have more flexibility. Even at high incomes, the deduction is available if the business pays sufficient W-2 wages or holds enough qualified property.

When Entrepreneurs Use This

Pass-through business owners: Any entrepreneur with S-Corp, partnership, or LLC income
Entity structure planning: Choosing between C-Corp and pass-through status based on Section 199A benefit
W-2 wage optimization: Structuring reasonable compensation to maximize the deduction
Real estate investors: Rental income can qualify if certain safe harbor requirements are met
SSTB workarounds: Segregating non-SSTB activities from SSTB activities to preserve the deduction on qualifying income

Dew Wealth Perspective

Optimizing Section 199A can make a six or seven-figure difference over a business's lifetime. One Dew Wealth client had invested $5 million in a private credit strategy generating qualified REIT income under Section 199A. The previous CPA was not categorizing this income correctly, treating it as ordinary income rather than qualified REIT income eligible for the 20% deduction. This oversight cost the client over $35,000 in unnecessary taxes in a single year.

The Linchpin Partner ensures that the tax advisor coordinates with the investment team so that income classifications are correct and the deduction is maximized across all income sources.

Frequently Asked Questions

My business is an SSTB. Am I completely locked out?

Below the income thresholds, the deduction applies in full regardless of business type. Above the thresholds, it phases out. Strategic income management (timing deductions, charitable giving, retirement contributions) can keep income below the phase-out range.

Is this deduction permanent?

Section 199A was enacted as part of the 2017 Tax Cuts and Jobs Act and was set to expire after 2025. Legislative action may extend or modify the provision.

How does this interact with state taxes?

Section 199A is a federal deduction only. State treatment varies. Some states allow a corresponding deduction; others do not.

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