Self-Employed Tax Deductions: The 2026 List

Self-employed workers deduct ordinary and necessary business costs on Schedule C: home office, vehicle miles, software, supplies, business insurance, and professional fees. Those expenses cut both income tax and self-employment tax. Health insurance premiums and retirement contributions work differently: they cut income tax only.

What counts as a self-employed deduction

The IRS standard is ordinary and necessary. Ordinary means common and accepted in your line of work. Necessary means helpful and appropriate for the business. Publication 334 is where the IRS lays this out for sole proprietors.

The test is about the business, not the receipt. A monitor is ordinary and necessary for a freelance designer. The same monitor for a dog walker who never works on screen is a harder claim. When an item serves both business and personal use, deduct the business share and keep a record of how you split it.

Personal spending does not become deductible because it ran through the business card. Lavish spending does not become deductible because the business paid for it.

The same logic runs through every category below. A camera is ordinary and necessary for a product photographer and a hobby purchase for a rideshare driver. Ask two questions of every line: what did this do for the business, and would I have bought it without the business?

The full 2026 list

Grouped by where each deduction lands. Work down the list against your own bank and card statements before you file.

Home and vehicle

Two ways to claim a home office:

• Simplified method: $5 per square foot, up to 300 square feet, for a maximum of $1,500. Multiply qualifying square footage by five and the math is done. The IRS simplified option page has the worksheet.
• Regular method: actual expenses for the whole home, times the business percentage. The space must see exclusive and regular use, and generally be your principal place of business. Publication 587 covers both methods in full.

The simplified home office method allows $5 per square foot, up to 300 square feet. A spare room that doubles as a guest room fails the exclusive-use test on either method. Measure only the space that qualifies: a basement office with a play corner in it does not count in full.

For vehicles, you choose standard mileage or actual costs, one method per vehicle. Standard mileage multiplies business miles by the IRS rate for the year. Actual costs track fuel, repairs, insurance, and depreciation times the business share. Personal commuting miles never qualify, on either method. Drivers who spend most of their week on the road usually do better with mileage. The 2026 rates and the mid-year change are covered in our gig worker deduction guide. Whichever method you pick, the log is what makes it defensible: miles claimed with no record behind them are the ones that get challenged.

Health and insurance

Self-employed health insurance premiums are not Schedule C expenses. They are an adjustment on Form 1040 Schedule 1, which means they reduce income tax but not self-employment tax. That distinction matters when you estimate quarterly payments, because the premiums do not shrink the profit self-employment tax is calculated on.

Business insurance is different. Liability policies, business property coverage, and similar policies taken out for the business are Schedule C expenses in the year you pay them. A policy that covers both personal and business property gets split, and only the business share goes on Schedule C.

Retirement

SEP and solo 401(k) contributions reduce income tax, not self-employment tax. The contribution still lowers the income your income tax is calculated on, but self-employment tax applies to net profit before those contributions. Limits change most years, so check the plan documents for the current year before funding.

Business expenses

• Bookkeeping, invoicing, and other software and subscriptions used for the business
• Supplies and materials
• The business-use share of your phone bill
• Legal and professional fees, including tax preparation for the business
• Advertising, website costs, and business cards

The phone is the common slip. Deduct the business share of the bill, not the whole plan, and keep a defensible basis for the percentage you used. A home internet plan follows the same rule: total bill, business share, and a reason for the number.

Big-ticket buys

Equipment, furniture, and vehicles can qualify for Section 179 expensing or be depreciated over several years instead of deducted at once. Which path fits depends on the asset, the cost, and the year's profit. Run the numbers both ways before filing, because the choice can move a deduction into the year it helps most.

Deductions people miss

• Bank fees and monthly maintenance on the business account
• Payment processing fees, the per-transaction cut every platform takes
• Education that maintains or improves skills you already use in the business
• Money spent before the first sale, like early advertising, which follows startup-cost rules rather than the regular Schedule C lines
• Professional dues and industry publications
• Shipping and postage for the business

The pattern in what gets missed: small recurring charges nobody keeps receipts for. Pull the year's statements and go down them line by line.

Records the IRS expects

For most expenses, no special form is required. What holds up is a receipt plus the business purpose, recorded close to the time of purchase. A log kept as you go beats a reconstruction assembled the week before filing. If the IRS examines your return, the contemporaneous record is the one that ends the conversation fastest. Digital receipts count fully: a photo of a paper receipt, or the emailed invoice, with the purpose noted when you file it.

Documenting one deduction takes five steps:

1. Note the expense: what, when, how much.
2. Keep the receipt, paper or digital.
3. Write the business purpose next to it in a word or two.
4. File it under a category that matches a Schedule C line.
5. Note which form line it lands on when the return is prepared.

How deductions flow onto your return

Schedule C lists the income, then the expense categories, and the difference is net profit. That profit moves to Schedule SE, where self-employment tax is calculated at 15.3%: 12.4% for Social Security up to the $184,500 wage base for 2026, and 2.9% for Medicare with no cap. You deduct half of the resulting self-employment tax, and the final numbers land on Form 1040. The half you deduct is a subtraction on that return, not a refund of the tax itself. When expenses top income, Schedule C shows a loss, which generally reduces other income reported on the return.

Schedule C expenses cut both income tax and self-employment tax. That is what makes them worth hunting down: each one reduces the profit both taxes are calculated on, while an adjustment elsewhere only touches income tax.

After that, the standard deduction applies: $16,100 single or married filing separately, $24,150 head of household, $32,200 married filing jointly for 2026. The 2026 tax changes guide covers the other numbers that moved. Net profit also usually triggers quarterly estimated payments. Our quarterly estimated taxes guide walks through due dates and safe harbors. For what this structure means compared with a salary job, see 1099 vs. W-2.

Want a second set of eyes on your deduction list before you file? Book a session with Okeyma and go through your records line by line. For what working with a preparer involves, see how much a tax preparer costs. For the return these deductions land on, see individual tax services.

This article is for general informational purposes and does not constitute tax or legal advice. Consult a qualified professional for your specific situation.