Small Business Owner Tax Guide for Practitioners — 2026
Complete practitioner guide to small business taxation — entity selection, QBI deduction, Section 179, retirement plans, payroll tax compliance, and exit planning. Updated for 2026.
Entity Selection — The Foundation of Small Business Tax Planning
| Entity Type | Federal Tax Treatment | SE Tax | QBI Deduction | Best For |
|---|---|---|---|---|
| Sole proprietor | Pass-through; Schedule C | Full SE tax (15.3%) | Yes | Simplest; no separate filing |
| Single-member LLC | Pass-through; Schedule C (default) | Full SE tax | Yes | Liability protection; same tax as sole prop |
| S corporation | Pass-through; Form 1120-S | SE tax on salary only | Yes | Net income >$80K; SE tax savings |
| C corporation | Entity-level tax (21%) | No SE tax | No QBI deduction | Rarely beneficial for small business |
| Partnership/multi-member LLC | Pass-through; Form 1065 | SE tax on guaranteed payments | Yes | Multiple owners |
Source: IRC §1361; §1401; §199A; §11 (C corp rate)
The S corporation sweet spot: S corporation election is most beneficial when net business income exceeds $80,000-$100,000 per year. The S corp allows the owner to pay a reasonable W-2 salary and take the remaining profit as a distribution — which is not subject to self-employment tax. For a business with $200,000 in net income and a $100,000 reasonable salary, the SE tax savings are approximately $7,650 per year. Over 10 years: $76,500 in savings — plus the compounding benefit of lower AGI on other deductions.
QBI Deduction — The Most Valuable Deduction for Small Business Owners
| QBI Deduction Scenario | Deduction | Limitation |
|---|---|---|
| Non-SSTB, AGI under $197,300 (single, 2026) | 23% of QBI (OBBBA §70301) | Limited to 20% of taxable income minus net capital gains |
| Non-SSTB, AGI $197,300-$247,300 (single, 2026) | Partial deduction | Phase-out based on W-2 wages and qualified property |
| Non-SSTB, AGI over $247,300 (single, 2026) | 23% of QBI (OBBBA §70301) (W-2 wage limitation applies) | 50% of W-2 wages or 25% of W-2 wages + 2.5% of qualified property |
| SSTB, AGI under $197,300 (single, 2026) | 23% of QBI (OBBBA §70301) | Same as non-SSTB |
| SSTB, AGI over $247,300 (single, 2026) | No deduction | SSTB limitation eliminates deduction |
Source: IRC §199A; Treas. Reg. §1.199A-1 through §1.199A-6; Rev. Proc. 2025-32 (2026 thresholds)
W-2 wage limitation strategy: For high-income small business owners (above $247,300 single), the QBI deduction is limited to 50% of W-2 wages paid by the business. This creates an incentive to pay W-2 wages — either to the owner (via S corp) or to employees. Practitioners should model the W-2 wage limitation for high-income clients to determine the optimal salary structure.
Section 179 and Bonus Depreciation for Small Business
| Depreciation Tool | 2026 Rules | Best For |
|---|---|---|
| Section 179 expensing | $1,220,000 limit; phase-out at $3,050,000 | Equipment, vehicles, software, improvements |
| Bonus depreciation | 20% for 2026; 0% for 2027+ | New and used property; accelerate before phase-out |
| Regular MACRS | 5-7 year for most equipment; 15 year for improvements | Remaining basis after §179 and bonus |
| Listed property (vehicles) | $12,400 for cars; $30,500 for SUVs (2026) | Business vehicles; document business use |
Source: IRC §179; §168(k); §280F; Rev. Proc. 2025-32 (2026 limits)
Case Study: Jennifer M., owner of a landscaping business. Net income: $185,000. Previously filing as sole proprietor with minimal planning. Practitioner identified: S corp election (salary $90,000; distribution $95,000; SE tax savings $7,268); QBI deduction $18,500; SEP-IRA $22,500; Section 179 on new equipment $45,000; health insurance deduction $14,400. Total additional deductions: $100,400. Tax savings: $28,000. Practitioner fee: $3,500. ROI: 8:1. Annual ongoing savings: $22,000.
Frequently Asked Questions
The information on this page is intended for licensed tax professionals (CPAs, EAs, and tax attorneys) and is provided for educational and research purposes only. Tax law is complex and fact-specific — all strategies discussed are subject to limitations, phase-outs, and conditions that may not apply to every client situation. Practitioners should independently verify all information against current IRS guidance, Treasury Regulations, and applicable state law before advising clients. This content does not constitute legal or tax advice.
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