IT Consultant / MSP Owner Tax Playbook 2026

An S-Corp election allows the owner to split income between a reasonable salary (subject to 15.3% FICA on the first $176,100 in 2026) 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.

The §199A deduction allows pass-through business owners to deduct up to 23% of qualified business income (QBI) from taxable income (increased from 20% 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. Specified Service Trades or Businesses (SSTBs) phase out above this threshold.

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 because it allows the highest contributions relative to income.

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 (mortgage interest, utilities, insurance, depreciation) 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).

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 (up to $30,500 for heavy SUVs) and bonus depreciation without luxury auto limits. A mileage log must be maintained for either method. The vehicle must be used more than 50% for business to qualify for accelerated depreciation.

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 while the business deducts the same amount.

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. A cost segregation study costs $5,000–$15,000 and typically has a 10:1+ ROI.

A sole proprietor pays self-employment tax (15.3%) on all net profit. An S-Corp owner pays FICA only on their reasonable salary, saving SE tax on distributions. For a business with $200,000 in net profit, the S-Corp saves $15,000–$20,000/year in SE tax. The S-Corp has additional costs (payroll, bookkeeping, tax preparation) of $2,000–$4,000/year, making the break-even point approximately $40,000–$50,000 in net profit.

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. S-Corp owners should adjust their payroll withholding to cover their estimated tax liability.

Ordinary and necessary business expenses under §162 include: professional licenses and continuing education, professional liability insurance, office supplies and equipment, software subscriptions, marketing and advertising, professional association dues, business travel (flights, hotels, 50% of meals), and home office expenses. Personal expenses are not deductible even if they have some business connection.

To elect S-Corporation status, the business owner must timely file Form 2553 with the IRS, generally by March 15 of the tax year for which the election is intended. The entity must be a domestic corporation or LLC eligible to be treated as a corporation, have no more than 100 shareholders, and meet all shareholder eligibility requirements under Subchapter S. It is critical to ensure all shareholders consent to the election on Form 2553. After election, the business must file Form 1120-S annually and comply with payroll tax requirements, including issuing W-2 wages to shareholder-employees.

Payroll taxes for S-Corp shareholder-employees must be deposited according to the IRS deposit schedule, which is generally semi-weekly or monthly depending on the total tax liability, per IRS Publication 15. Form 941 must be filed quarterly to report federal income tax withheld, Social Security tax, and Medicare tax. The annual Form 940 is required for FUTA tax reporting. W-2 forms must be furnished to employees and filed with the Social Security Administration by January 31, 2027, for the 2026 tax year.

To substantiate a reasonable salary under IRS scrutiny, maintain contemporaneous documentation such as compensation studies for similar roles in the IT consulting or MSP industry, detailed job descriptions, hours worked, qualifications, and compensation history. Board meeting minutes approving salary amounts and evidence of payroll tax deposits and W-2 issuance are also essential. This documentation helps mitigate risk of recharacterization of distributions as wages and potential penalties under §3121 and related provisions.

IRS audits are frequently triggered by disproportionately low shareholder-employee salaries relative to distributions, particularly when the salary is significantly below industry norms. Red flags include minimal or zero reported wages while taking large distributions, inconsistent payroll filings, and failure to file Forms 941 or W-2s. The IRS may apply the reasonable compensation test derived from case law and §162(a) to reclassify distributions, assess back payroll taxes, penalties, and interest.

If the consultant owns both an LLC taxed as a sole proprietorship and an S-Corp, income splitting strategies must be carefully coordinated. The LLC's income is subject to self-employment tax, while the S-Corp income can be split between reasonable salary (subject to payroll taxes) and distributions (not subject to self-employment tax). However, the IRS scrutinizes attempts to minimize employment taxes by shifting income improperly. It's important to maintain clear accounting separation and comply with all payroll and tax filing requirements for the S-Corp entity.

S-Corp distributions to shareholder-employees are generally excluded from self-employment tax, provided a reasonable salary is paid, whereas guaranteed payments to partners in an LLC are subject to self-employment tax under §1402(a). Guaranteed payments are treated as ordinary income and deductible by the partnership. By contrast, distributions from an S-Corp are not deductible by the corporation and represent a return of capital or profit share. This distinction impacts both tax planning and compliance risk.

Ask about their current payroll practices, including how they determine shareholder-employee salaries and whether they have documented compensation studies. Inquire about their payroll tax deposit schedule, use of payroll service providers, and whether Forms 941 and W-2 have been timely filed in prior years. Also, verify their understanding of distribution versus salary distinctions and whether they maintain adequate documentation to support reasonable compensation. These questions help identify compliance gaps and potential audit risks.