What Are Tax Write-Offs? (Simple Explanation)

The simple definition

A tax write-off is a business expense you subtract from your gross income before the IRS calculates how much tax you owe. The lower your taxable income, the lower your tax bill. Write-offs are also called deductions — the two terms mean exactly the same thing. "Write-off" is everyday language; "deduction" is what you'll see on IRS forms and publications.

How write-offs actually save you money

Write-offs don't give you a dollar-for-dollar refund — they reduce the income that gets taxed. The amount you save depends on your tax rate.

Example for illustration only. Your actual savings depend on your tax bracket and total deductions.

Who can claim business write-offs?

You can claim business deductions if you earn income from self-employment. This includes:

• Freelancers and independent contractors
• 1099 workers (1099-NEC or 1099-K income)
• Sole proprietors
• Single-member LLCs filing Schedule C
• Gig economy workers (rideshare, delivery, etc.)
• Side hustle income on top of a W-2 job

W-2 employees generally cannot deduct unreimbursed work expenses under current tax law (post-2017 Tax Cuts and Jobs Act), with narrow exceptions.

The IRS "ordinary and necessary" test

Under IRC §162, a business expense must be ordinary (common and accepted in your industry) and necessary (helpful and appropriate for your business) to qualify as a deduction. You don't need to prove the expense was unavoidable — just that a reasonable business owner in your field would make the same purchase.

Most common write-offs for freelancers

What doesn't qualify as a write-off

The most common audit triggers come from claiming personal expenses as business deductions. These never qualify:

• Personal expenses (groceries, personal clothing, vacations)
• Commuting to a regular office
• Political contributions
• Fines and penalties
• Personal portion of mixed-use expenses

Mixed-use expenses (like a phone used for both personal and business) are split — you can only deduct the business-use percentage.

Frequently Asked Questions

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