Business owner deductions encompass every tax break available to individuals who own and operate a business — from standard operating expense deductions to owner-specific benefits like the qualified business income deduction (up to 20%), self-employed health insurance deduction (100%), and retirement contributions (up to $69,000 annually). The specific deductions and strategies available depend on your entity type, income level, and business structure. Tax Sherpa builds custom tax strategies for business owners at every stage.
Key Takeaways
- Business owners have access to more deductions than W-2 employees in almost every category
- Owner-specific deductions include QBI (20%), health insurance (100%), retirement, and self-employment tax deduction
- Your entity type affects how deductions are reported but not which deductions are available
- Strategic planning — entity election, salary optimization, retirement funding — can save $10K–$30K+ annually
- Tax planning should happen throughout the year, not just at tax time
Owner-Specific Deductions
These deductions are available specifically because you own a business:
Qualified Business Income Deduction (Section 199A)
- Deduct up to 20% of qualified business income
- Available to sole proprietors, partnerships, S-corps, and some trusts
- Phase-out begins at $191,950 (single) / $383,900 (MFJ) for 2024
- Specified service trades (law, accounting, health, consulting) face additional limitations above thresholds
Self-Employed Health Insurance
- 100% deductible for health, dental, and vision insurance
- Covers you, your spouse, and your dependents
- Above-the-line deduction (reduces AGI)
- Cannot exceed net self-employment income
Retirement Contributions
- Solo 401(k): Up to $69,000 total (2024)
- SEP IRA: Up to 25% of net self-employment income
- Reduces taxable income dollar-for-dollar while building retirement wealth
Self-Employment Tax Deduction
- Deduct 50% of self-employment tax as an above-the-line deduction
- Automatic but often overlooked in tax planning
Owner Tax Strategy: Beyond Deductions
Deductions are only one piece. Smart business owners also use:
- Entity election optimization — Choosing between sole prop, LLC, S-corp, or C-corp based on income level
- Income timing — Accelerating deductions and deferring income near year-end
- Hiring family members — Legitimate employment of spouses and children can shift income to lower tax brackets
- Augusta Rule — Renting your home to your business for up to 14 days tax-free
- Accountable plans — Tax-free reimbursement of business expenses through your S-corp or any entity type
- Charitable strategies — Donor-advised funds, qualified charitable distributions, and strategic timing
Frequently Asked Questions
What's the single biggest deduction most business owners miss?
Retirement contributions. A Solo 401(k) allows up to $69,000 in annual contributions (2024), reducing taxable income immediately while building wealth. Many business owners don't realize they can contribute as both employee and employer.
Can I deduct my own salary as a business expense?
It depends on your entity type. Sole proprietors cannot deduct their own "salary" — profit is their compensation. S-corp and C-corp owners can deduct reasonable salary as a business expense (it's on the W-2 and deducted by the entity).
Neal's #1 Recommendation for Every Business Owner: The Accountable Plan
"If I could give every business owner one piece of advice — regardless of whether they're a sole proprietor, an S-corp, or a partnership — it's this: get an accountable plan. Accountable plan. Accountable plan. I cannot say it enough."
— Neal McSpadden, Tax Sherpa
An accountable plan is a documented reimbursement arrangement that allows a business to reimburse an owner (or employee) for legitimate business expenses paid out of pocket — completely tax-free. Unlike taking a deduction directly on Schedule C or Form 1120-S, reimbursements through an accountable plan are excluded from income entirely. They don't show up on your W-2. They reduce the company's taxable income. And they're legal for every entity type.
Why does this matter so much? Because business owners are already spending money on their business every single day — they're just not getting credit for it. Phone bills, home office use, internet, vehicle mileage, tools, subscriptions — the expenses are real. The accountable plan is the mechanism that captures them properly.
The IRS requires three things for a reimbursement to qualify:
- Business connection — the expense must have a legitimate business purpose
- Substantiation — receipts, mileage logs, or other documentation
- Return of excess amounts — if you advance more than you spent, the excess must be returned
Get that written plan in place. It costs almost nothing to implement and the payoff is immediate.
The Sleeper Pick: Section 139 Disaster Relief Plans
Most business owners — and most tax professionals — have never heard of Section 139. That's exactly why you should have one.
Section 139 of the Internal Revenue Code allows an employer to make tax-free payments to employees to reimburse or pay for "reasonable and necessary" personal, family, living, or funeral expenses incurred as a result of a federally declared disaster. The payments are deductible to the business and excluded from the employee's income. No payroll taxes. No income taxes. Clean.
Here's the detail that most people miss: Schedule C owners can qualify as common-law employees of their own business for purposes of Section 139. That means even sole proprietors — not just S-corp owners with W-2s — can potentially access this benefit.
You don't know if a federally declared disaster will ever affect your area. Most years it won't apply at all. But when it does — a hurricane, a wildfire, a flood that shuts down your area — you want a written Section 139 plan already in place. You cannot create it retroactively. The time to set it up is now, before you ever need it.
The plan itself is simple: a written document stating that your business will reimburse qualifying employees for reasonable disaster-related expenses when a federal disaster declaration applies to your area. One or two pages. Done.
This is the kind of low-effort, high-leverage move that separates proactive tax planning from reactive tax filing. Tax Sherpa builds these into client plans as standard practice.
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