What Can I Write Off on My Taxes? 2025 | Every Deduction by Situation
Tax Deductions · 2025 Guide
What Can I Write Off on My Taxes? Every Deduction, by Situation
The answer depends almost entirely on your situation — whether you own a home, work for yourself, had medical expenses, or made charitable contributions. This guide organizes every major tax write-off by who it applies to, so you can quickly find what’s relevant to you and click through for the full details.
Homeowners Self-Employed / 1099 Medical Expenses Everyone Deductions vs. Credits
Homeownership is one of the biggest drivers of itemized deductions. These write-offs can push you well over the standard deduction, especially if you have a large mortgage or live in a high-tax state.
Mortgage Interest
Loans up to $750K. Deductible on federal Schedule A. Not deductible in some states (e.g., NJ).
This is where the most valuable deductions live. Every dollar you write off reduces both your income tax and your 15.3% self-employment tax — making business deductions worth significantly more per dollar than itemized deductions for most contractors and freelancers.
Home Office
$5/sq ft simplified, or actual expenses. Must be regular and exclusive business use.
Medical expenses are deductible on federal Schedule A to the extent they exceed 7.5% of your AGI. You have to clear that floor first — but once you do, everything above it counts. Use our calculator to find out if you qualify.
Doctor, Dental & Vision
Co-pays, out-of-pocket costs after insurance. Glasses, contacts, and dental work all qualify.
These above-the-line deductions are available whether you take the standard deduction or itemize. They reduce your AGI directly — making them among the most valuable write-offs available.
HSA Contributions
Contributions to a Health Savings Account are fully deductible and grow tax-free. 2025 limit: $4,300 (self) / $8,550 (family).
A tax deduction reduces your taxable income. In the 22% bracket, a $1,000 deduction saves you $220. A tax credit reduces your actual tax bill dollar-for-dollar — $1,000 credit = $1,000 saved. Credits are more powerful, but most tax write-offs people talk about are deductions. This site focuses on deductions, which apply to the widest range of people.
Not sure what applies to your situation?
Describe your job, home, and health in plain English — our AI Deduction Finder tells you the top 5 deductions most relevant to you in under a minute.
The most commonly missed write-offs are: the home office deduction for self-employed workers, business mileage, self-employed health insurance premiums, retirement contributions (SEP-IRA, Solo 401k), and medical expenses that exceed the 7.5% AGI threshold. Many people also miss above-the-line deductions like student loan interest and HSA contributions because they don’t realize these are available without itemizing.
No — many of the most valuable write-offs don’t require itemizing at all. Above-the-line deductions including student loan interest, self-employed health insurance, HSA contributions, educator expenses, IRA contributions, and the self-employment tax deduction are all available to filers who take the standard deduction. Schedule C business deductions for self-employed workers also exist entirely outside the itemized vs. standard deduction choice.
A tax deduction reduces your taxable income — so the value depends on your tax bracket. In the 22% bracket, a $1,000 deduction saves $220. A tax credit directly reduces your tax bill dollar-for-dollar — a $1,000 credit saves exactly $1,000 regardless of your bracket. Credits are more powerful but more narrowly targeted. This site focuses on deductions, which apply to the broadest range of taxpayers including homeowners, self-employed workers, and people with medical expenses.
Under current federal law (since the 2017 Tax Cuts and Jobs Act), W-2 employees cannot deduct unreimbursed employee business expenses on their federal return. This includes home office expenses, tools, uniforms, and professional development. The best path for W-2 employees is to ask their employer about reimbursement under an accountable plan. Some states (like California) do still allow employee business expense deductions on the state return.
This guide is for educational purposes only and does not constitute tax advice. Tax laws change annually — consult a licensed CPA or tax professional for advice specific to your situation. Sourced from IRS Publications 17, 502, 463, and 535.