What Is a Tax Deduction?

How tax deduction works

A tax deduction lowers a freelancer's taxable income by subtracting qualified business expenses from gross income before tax is calculated. A $5,000 deduction at a 22% marginal rate plus 15.3% self-employment tax saves roughly $1,865 in tax, not $5,000 — deductions reduce taxable income, not the tax bill dollar-for-dollar. Twelve common categories apply to freelancers: home office, software and subscriptions, health insurance premiums, equipment, professional services, education, travel, meals (50% deductible), advertising, phone and internet, business insurance, and retirement contributions. The home office deduction uses the simplified method at $5 per square foot up to 300 square feet, capping at $1,500 per year. The IRS requires every deduction to be ordinary and necessary for the business, and freelancers must keep receipts and records to survive an audit. Deductions reduce both income tax and the 15.3% self-employment tax base, which makes them more valuable to freelancers than to W-2 employees. The pricing implication is direct: deductions cut the effective tax rate that a freelancer must bake into rates. A freelancer who tracks $12,000 in annual deductions keeps more of every invoice, so the floor rate needed to hit a target take-home drops. Freelancers who ignore deductions overpay tax and either undercharge or under-earn. Tracking deductions throughout the year, rather than scrambling at filing time, turns ordinary spending into rate-relevant savings.