Tax deductions work for an LLC by reducing the business profit that flows through to the owners’ personal tax returns, so the owners pay income tax and self-employment tax only on what’s left after legitimate costs are subtracted. The IRS does not tax a standard LLC as a separate entity. Income, expenses, and deductions land on each owner’s Form 1040, which means every qualifying expense the LLC pays directly lowers the owner’s individual taxable income.
The mechanics change depending on how many owners the LLC has, what kind of expense you’re deducting, and whether the LLC has made a special tax election. The rules below cover the pieces that matter most.
Where LLC Deductions Actually Land on Your Return
The IRS assigns a default tax classification based on how many members the LLC has.1eCFR. 26 CFR Section 301.7701-3 – Classification of Certain Business Entities That classification determines which form carries your deductions.
A single-member LLC is treated as a “disregarded entity.” The IRS ignores the LLC wrapper, and business income and deductions all appear on the owner’s Form 1040, typically on Schedule C.2Internal Revenue Service. Single Member Limited Liability Companies Individual expense categories go on designated lines: office supplies on line 18, business travel on line 24a, and so on.3Internal Revenue Service. Instructions for Schedule C (Form 1040) Whatever’s left after deductions is the profit the owner pays tax on.
A multi-member LLC defaults to partnership treatment. The LLC files Form 1065 as an informational return and pays no federal income tax itself. Each member receives a Schedule K-1 showing their share of profits and deductions, which they then report on their own returns.4Internal Revenue Service. LLC Filing as a Corporation or Partnership Deductions are taken at the LLC level, then split among members according to the operating agreement.
Either way, the LLC does not pay federal income tax on its profits. The owners do, on their personal returns, after deductions.
What Counts as a Deductible Business Expense
The federal standard is short. An expense must be both “ordinary” (common in your industry) and “necessary” (helpful and appropriate for running the business).5Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses That covers most legitimate operating costs, but the IRS looks harder at anything that could double as a personal expense.
Categories that come up for almost every LLC:
- Rent for office, retail, or warehouse space, along with the utilities tied to that space.
- Equipment and supplies. Smaller items can be deducted the year you buy them; larger purchases may need to be depreciated over several years, or deducted up front under the Section 179 expensing rules.
- Business travel that takes you away from your regular place of business overnight. Airfare, hotels, and ground transportation qualify.
- Vehicle expenses. You can deduct either your actual costs (gas, insurance, repairs) or use the IRS standard mileage rate, which is 72.5 cents per mile for 2026. You cannot use both methods for the same vehicle in the same year, and you need a mileage log either way.6Internal Revenue Service. 2026 Standard Mileage Rates
- Business meals with clients, vendors, or associates, deductible at 50% of the cost. Keep receipts showing the date, amount, who attended, and the business purpose.7Internal Revenue Service. Topic No. 511, Business Travel Expenses
- Professional services, including accounting fees, legal consultations, and business insurance premiums.
Home Office Rules
You can deduct part of your housing costs if you work from home, but the workspace must be used regularly and exclusively for business. It also has to be your principal place of business or a spot where you regularly meet with clients.8Office of the Law Revision Counsel. 26 USC 280A – Disallowance of Certain Expenses in Connection With Business Use of Home A desk in a bedroom that doubles as personal space does not qualify. The “exclusively” requirement is where a lot of filers lose the deduction.
Two ways to calculate it. The regular method takes the percentage of your home’s square footage used for business and applies it to your actual housing costs: mortgage interest, property taxes, utilities, insurance, and depreciation. The simplified method skips that math and gives you $5 per square foot of dedicated office space, capped at 300 square feet, for a maximum deduction of $1,500.9Internal Revenue Service. Simplified Option for Home Office Deduction The regular method usually produces a larger deduction when housing costs are high, but the simplified method saves considerable bookkeeping.
Deductions That Don’t Feel Like Business Costs
Self-Employed Health Insurance
If you pay for your own health insurance and you’re not eligible for coverage through a spouse’s employer plan, you can deduct 100% of the premiums for yourself, your spouse, and your dependents. Medical, dental, and qualifying long-term care policies all count.10Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses – Section 162(l) This one goes on Form 1040 as an adjustment to income, not on Schedule C, which means it reduces your adjusted gross income but does not reduce your self-employment tax. The deduction also cannot exceed your net business profit for the year. If the LLC lost money, this deduction is not available for that year.
Retirement Plan Contributions
Contributions to a retirement plan set up through your LLC lower your current tax bill and build savings at the same time. The two common options are SEP IRAs and Solo 401(k)s. For 2026, SEP IRA contributions cannot exceed the lesser of 25% of your net self-employment income or $69,000.11Internal Revenue Service. SEP Contribution Limits (Including Grandfathered SARSEPs) A Solo 401(k) lets you contribute both as an “employee” (up to $24,500 in elective deferrals for 2026) and as an “employer” (up to 25% of compensation), with the same $69,000 combined cap.12Internal Revenue Service. One-Participant 401(k) Plans Owners 50 or older can exceed these limits with catch-up contributions.
Start-Up and Organizational Costs
Money spent before the LLC opens for business is treated differently from ongoing operating expenses. That includes market research, launch advertising, training, and professional fees for setting up the entity. In your first year of business, you can deduct up to $5,000 of start-up costs immediately. That $5,000 shrinks dollar-for-dollar once total start-up spending exceeds $50,000, and anything left over is spread evenly over 180 months.13Office of the Law Revision Counsel. 26 U.S. Code 195 – Start-Up Expenditures
Organizational costs get the same treatment. State filing fees, drafting the operating agreement, and initial legal or accounting fees to structure the LLC all fall under the $5,000 immediate deduction plus 180-month amortization.14eCFR. 26 CFR 1.248-1 – Election to Amortize Organizational Expenditures Spend less than $5,000 total and you deduct it all in year one. The election is automatic; the IRS assumes you’re taking it unless you specifically choose to capitalize the costs instead.
The 20% Qualified Business Income Deduction
Section 199A lets eligible LLC owners deduct up to 20% of their qualified business income from taxable income, on top of every other deduction described above.15Office of the Law Revision Counsel. 26 USC 199A – Qualified Business Income Qualified business income is roughly your LLC’s net profit minus items like capital gains, interest, and dividends.
If your total taxable income (before the QBI deduction) is below the annual threshold, you claim the full 20% with no additional limits. For 2025, those thresholds were $197,300 for single filers and $394,600 for joint filers, adjusted annually for inflation.16Internal Revenue Service. Instructions for Form 8995-A (2025)
Above those levels, more rules apply. If the LLC is in a “specified service” field (law, medicine, consulting, financial services, and similar professions that depend on the skill or reputation of the people involved), the deduction phases out and can disappear entirely. For non-service businesses, the deduction may be limited by the W-2 wages the business pays or the value of its depreciable property. Starting in 2026, the phase-in range over which these limitations apply expanded to $150,000 for joint filers and $75,000 for other filers.
Self-Employment Tax and the Half You Get Back
Deductions lower the profit you owe income tax on, but they also lower the profit you owe self-employment tax on. That second piece catches new LLC owners off guard. For 2026, the combined self-employment rate is 15.3%: 12.4% for Social Security on earnings up to $184,500, plus 2.9% for Medicare on all earnings.17Social Security Administration. Contribution and Benefit Base18Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet Earnings above $200,000 ($250,000 for joint filers) trigger an additional 0.9% Medicare surtax.
Half of your self-employment tax is itself deductible as an adjustment to income on your personal return, which lowers your adjusted gross income.19Internal Revenue Service. Topic No. 554, Self-Employment Tax Note the limit: the self-employed health insurance deduction and the QBI deduction reduce income tax but not self-employment tax. Only the business expenses on Schedule C or Form 1065 shrink the base your self-employment tax is calculated on.
The S Corporation Election
LLC owners with consistently strong profits sometimes elect S corporation tax treatment to reduce self-employment tax. Under default LLC treatment, your entire share of business profit is subject to the 15.3% self-employment tax. With an S corporation election, you pay yourself a reasonable salary (subject to payroll taxes) and take remaining profits as distributions that are not subject to self-employment tax.
You make the election on Form 2553, filed no later than two months and 15 days after the start of the tax year you want the election to take effect. For a calendar-year LLC, that means March 15.20Internal Revenue Service. Instructions for Form 2553 The tradeoff isn’t automatic. The salary you pay yourself must be reasonable for your role and industry, and the IRS scrutinizes artificially low salaries. You’ll also take on payroll tax compliance. An S corporation election can reduce your qualified business income for Section 199A purposes because W-2 wages you pay yourself are excluded from QBI. For many LLC owners, the breakeven point where self-employment tax savings outweigh the added complexity falls somewhere above $60,000 to $80,000 in annual net profit, though the exact figure depends on the specifics.
Records That Protect Your Deductions
A deduction is only as strong as the records behind it. Keep receipts, bank statements, mileage logs, and written notes of the business purpose for every expense. The IRS can impose an accuracy-related penalty of 20% on any portion of tax you underpay because of careless or unsupported deductions.21Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments On a $10,000 underpayment, that’s $2,000 in penalties before interest.
Documentation built throughout the year holds up better than expenses reconstructed at tax time. Accounting software that categorizes transactions automatically makes this considerably easier, and the cost of that software is itself deductible.