TL;DR

A tax deduction reduces your taxable income, which directly reduces your tax bill. Every dollar of legitimate business expense you deduct saves you that dollar multiplied by your marginal tax rate — which can be 30–40% or more for many freelancers.

Key Points

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To be deductible, a business expense must be ordinary (common in your industry) and necessary (helpful and appropriate for your business)

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Common freelance deductions include: home office, software subscriptions, hardware, professional development, health insurance, and business travel

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Record-keeping is essential — deductions require documentation (receipts, invoices) to withstand IRS scrutiny

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A $1,000 deduction doesn't save you $1,000 in taxes — it saves you $1,000 × your marginal tax rate (potentially $250–$400)

What Qualifies as a Business Deduction

The IRS allows deductions for expenses that are ordinary and necessary for your business¹. Ordinary means common and accepted in your trade; necessary means helpful and appropriate for your business activities. For freelancers and small businesses, this typically includes: software and subscriptions used for work, hardware and equipment (immediately under Section 179 or depreciated), home office (if used regularly and exclusively for business), professional development and education, business travel and transportation, health insurance premiums for the self-employed, professional services (accountants, lawyers), and marketing expenses. Personal expenses — even if you used them occasionally for work — generally don't qualify.

The Home Office Deduction

If you use a portion of your home exclusively and regularly for business, you may deduct that space's proportional costs. There are two methods: (1) Simplified: deduct $5 per square foot of dedicated office space, up to 300 square feet ($1,500 maximum). (2) Actual expenses: calculate the percentage of your home used for business (e.g., 10%) and deduct that percentage of rent/mortgage interest, utilities, and home maintenance. The actual expenses method yields a larger deduction for most people but requires more documentation. Crucially, the space must be used exclusively for business — a dining room that doubles as an office doesn't qualify.

Keeping Records for Deductions

The IRS requires documentation for all business deductions — receipts, bank statements, invoices, and records showing the business purpose of the expense². For business meals, note who you were with and the business purpose. For travel, keep a log of destination, dates, and business purpose. Organize your receipts by category throughout the year — reconstructing them at tax time is difficult and error-prone. Many freelancers use accounting software that automatically categorizes expenses from bank and credit card feeds, making documentation significantly easier. Missing documentation means a deduction that was legitimately yours can be disallowed in an audit.

References

IRS — Deducting Business Expenses ↗

irs.gov

IRS — Self-Employment Tax (Social Security and Medicare Taxes) ↗

irs.gov

Last updated: June 9, 2026

Related Terms

Business Expense

A cost incurred in the ordinary course of running a business that may be deductible from taxable income, reducing the total tax owed.

Self-Employment Tax

A US federal tax consisting of Social Security and Medicare contributions that self-employed individuals must pay, covering both the employee and employer portions typically split in traditional employment.

Write-Off

The act of removing a business asset or uncollectable receivable from financial records, or the process of deducting a legitimate business expense from taxable income.

Estimated Tax

Advance tax payments made by self-employed individuals throughout the year to cover federal (and often state) income taxes and self-employment taxes, in the absence of employer withholding.

Receipt

A document issued by a seller to confirm that payment has been received from a buyer, serving as proof of the completed transaction.

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