Freelancers overpay tax more often than any other group of workers, and the reason is simple: nobody sends them a list of what they can deduct. Expense-tracking data suggests the average freelancer misses roughly $6,500 in deductions a year. At a 24 percent marginal rate plus 15.3 percent self-employment tax, that is about $2,500 in unnecessary tax. The deductions below are the ones that cover most of that gap.

The home office deduction is usually the biggest single write-off. If you use a defined space regularly and exclusively for business, you can deduct part of your housing costs. The simplified method pays $5 per square foot up to 300 square feet, a maximum of $1,500. The regular method applies your business-use percentage to rent, utilities, insurance, and repairs, and it often produces a larger number. A 200-square-foot office in a 1,000-square-foot home is 20 percent: on $24,000 of annual rent and utilities, that is a $4,800 deduction.

Mileage is the second most-missed deduction. The 2026 standard rate is 72.5 cents per mile from January 1 through June 30, and 76 cents per mile from July 1 through December 31, so split your log by period. Driving from a home office to a client site counts as business mileage; commuting to a regular workplace does not. A freelancer who drives 5,000 business miles deducts roughly $3,600. Keep a contemporaneous log with dates, destinations, and purpose, because a reconstructed log rarely survives an audit.

Health insurance premiums are fully deductible for self-employed people who cannot get coverage through a spouse's employer. The deduction is claimed above the line, so it lowers income tax even if you take the standard deduction, though it does not reduce self-employment tax. You can also deduct half of your self-employment tax itself: on $80,000 of net income, that adjustment is roughly $5,652. Equipment, software subscriptions, phone and internet at the business-use percentage, professional development, and business meals at 50 percent all belong on Schedule C as ordinary and necessary expenses.

Two deductions deserve special attention. The qualified business income deduction under Section 199A lets eligible freelancers deduct up to 20 percent of qualified business income, with 2026 thresholds of $201,750 for most single filers and $403,500 for married couples filing jointly. A Solo 401(k) lets you contribute up to $72,000 in 2026 as both employee and employer. Retirement contributions are the rare deduction that moves money into your own future instead of out of your pocket.

The practical system is unglamorous: one business bank account, one expense-tracking app, and a weekly 15-minute habit of photographing receipts and tagging expenses. Do that for a year and filing becomes a review exercise instead of a reconstruction project. This article is general information, not tax advice, and the rules change: if your situation involves multiple income streams, an S corporation, or foreign clients, a one-hour session with a CPA usually pays for itself several times over.

Quarterly estimated taxes are the part of freelance tax that surprises newcomers most. Because no employer withholds tax for you, the IRS expects you to pay in four quarterly installments, in April, June, September, and January. A simple rule is to set aside 25 to 30 percent of every payment you receive in a separate account the day it arrives, so the money is there when the quarter ends. The safe harbor rule protects you from penalties if you pay at least 100 percent of last year's tax bill, or 110 percent if your income is higher, spread across the four quarters.