More Tax Planning FAQs
What is the S-Corp election and how does it reduce self-employment tax?
An S-Corp election allows the owner to split income between a reasonable salary (subject to 15.3% FICA) and distributions (not subject to FICA). For a business owner with $200,000 in net profit paying an $80,000 salary, the annual SE tax savings are approximately $15,500–$18,500. The S-Corp must file
Form 2553 within 75 days of formation.
What is the Section 199A QBI deduction and how does it apply?
The §199A deduction allows pass-through business owners to deduct up to 23% of qualified business income (QBI) from taxable income under OBBBA. For taxpayers above $403,500 (MFJ) in 2026, the deduction is limited to the greater of 50% of W-2 wages or 25% of W-2 wages plus 2.5% of qualified property.
What retirement plan options are available for self-employed professionals?
Self-employed professionals can establish a Solo 401(k) (up to $70,000 in 2026), a SEP-IRA (25% of net self-employment income up to $70,000), a SIMPLE IRA ($16,500 + $3,500 catch-up), or a Defined Benefit Plan (up to $280,000+ depending on age). The Solo 401(k) is the best option for most self-employed professionals.
How does the home office deduction work for self-employed professionals?
Self-employed professionals who use a dedicated home office space exclusively and regularly for business qualify for the home office deduction under §280A. The deduction is calculated as a percentage of home expenses equal to the office square footage divided by total home square footage. The simplified method allows $5/sq ft up to 300 sq ft ($1,500 maximum).
What vehicle deductions are available for self-employed professionals?
Self-employed professionals can deduct vehicle expenses using either the standard mileage rate (70 cents/mile in 2026) or actual expenses. Vehicles with a GVWR over 6,000 lbs qualify for §179 expensing and bonus depreciation without luxury auto limits. A mileage log must be maintained for either method.
What is the Augusta Rule and how can it benefit business owners?
The Augusta Rule (§280A(g)) allows homeowners to rent their primary or secondary residence to their business for up to 14 days per year. The rental income is completely tax-free to the homeowner, and the business deducts the rent as a business expense. At $2,000–$3,000/day for 14 days, this strategy generates $28,000–$42,000 of tax-free income.
How does cost segregation apply to business owners who own real estate?
Cost segregation reclassifies building components into shorter depreciation categories eligible for bonus depreciation. For a $1M commercial property, cost segregation typically identifies $150,000–$250,000 of accelerated depreciation, generating $60,000–$100,000 in first-year deductions at the 100% bonus depreciation (restored by OBBBA for property placed in service after Jan 19, 2025) rate in 2026.
What is the self-employed health insurance deduction?
Self-employed professionals can deduct 100% of health insurance premiums (for themselves, their spouse, and dependents) as an above-the-line deduction under §162(l). This deduction reduces AGI and is available even if the taxpayer does not itemize. S-Corp owners must include premiums in W-2 wages before claiming the deduction.
How should a self-employed professional handle estimated tax payments?
Self-employed professionals must make quarterly estimated tax payments by April 15, June 15, September 15, and January 15. The safe harbor is 100% of prior year tax (110% if prior year AGI exceeded $150,000). Failure to pay sufficient estimated taxes results in an underpayment penalty under §6654.
What is the excess business loss limitation for pass-through owners?
Under §461(l), pass-through business owners cannot deduct business losses exceeding $305,000 (single) or $610,000 (MFJ) in 2026 against non-business income. Excess losses are treated as an NOL carryforward to the following year.
How does the net investment income tax (NIIT) affect self-employed professionals?
The 3.8% NIIT applies to net investment income for taxpayers with MAGI above $200,000 (single) or $250,000 (MFJ). Active business income and wages are not subject to the NIIT. Self-employed professionals who invest in rental properties or passive businesses should plan for the NIIT impact.
How should an optometrist set up their practice entity to optimize tax benefits in 2026?
Optometrists should consider forming an S corporation or an LLC taxed as an S corporation to reduce self-employment taxes under §1402 and benefit from reasonable salary rules. The S-Corp election allows owners to pay themselves a reasonable salary while taking remaining profits as distributions, which are not subject to self-employment tax. Additionally, this structure facilitates retirement plan contributions and Section 199A deductions. Entity choice should also factor in state tax implications and potential audit risks.
What steps must an optometrist take to properly claim the Section 179 deduction on new equipment purchases in 2026?
To claim the Section 179 deduction, the optometrist must purchase eligible equipment and place it in service during the 2026 tax year. The total amount eligible for deduction is limited to $2,560,000 of equipment placed in service, with a phase-out starting at $6,500,000 per §179(b). Proper documentation including invoices, proof of payment, and asset records must be maintained. The deduction election is made on IRS
Form 4562, which must be attached to the timely filed tax return.
What documentation should an optometrist maintain to substantiate deductions for clinical supplies and malpractice insurance?
Per §162, optometrists must keep detailed receipts, invoices, and payment records for clinical supplies and malpractice insurance premiums. Since malpractice insurance premiums typically range between $1,200 and $3,500 annually, accurate records help avoid IRS scrutiny. Additionally, clinical supplies costing $8,000 to $15,000 per year require inventory logs to demonstrate ordinary and necessary business expenses. Documentation should be retained for at least three years following the filing deadline to withstand IRS examinations.
What are the audit triggers and compliance risks specific to optometrists claiming home office and vehicle deductions in 2026?
The IRS often scrutinizes home office deductions under §280A and vehicle expenses claimed using the standard mileage rate or actual costs. Audit triggers include disproportionate home office square footage relative to total home size, inconsistent mileage logs, and failure to separate personal from business use. Optometrists must maintain contemporaneous records such as mileage logs, appointment schedules, and home office floor plans showing exclusive and regular use. Overstated or unsupported deductions increase the risk of audit adjustments and penalties.
How should an optometrist handle tax planning if they operate both a private practice and work as an employee at a hospital?
When an optometrist has mixed income sources, the self-employed income from the private practice is subject to self-employment tax under §1401, while hospital wages are subject to regular payroll withholding. They should separately track income and expenses for the practice to maximize deductions and possibly qualify for the QBI deduction under §199A on business income. Retirement contributions must also be coordinated between employer-sponsored plans and any self-employed plans to avoid exceeding limits under the SECURE 2.0 Act.
How does the Section 199A qualified business income deduction compare to the benefits of the S-Corp election for optometrists?
The Section 199A deduction allows eligible optometrists to deduct up to 23% of qualified business income (OBBBA §70301) from their practice, subject to income thresholds and specified service trade rules. The S-Corp election reduces self-employment taxes by splitting income into salary and distributions but does not itself provide a direct deduction like §199A. Combining both strategies can maximize tax savings, as the income reported on the S-Corp flow-through may qualify for the QBI deduction, especially when taxable income is below $364,200 for joint filers in 2026.
What key questions should I ask my optometrist client to identify all potential deductible expenses and optimize their 2026 tax return?
Ask about all practice-related expenses including clinical supplies, malpractice insurance premiums, continuing education costs, and office overhead. Inquire whether they have purchased new equipment eligible for Section 179 or bonus depreciation. Determine if they maintain a home office or use vehicles for business purposes and if detailed records are kept. Also, verify their practice entity structure and retirement plan contributions to assess tax planning opportunities under §199A and SECURE 2.0 provisions.
