10 Commonly Missed Tax Deductions That Could Save You Thousands

Every year, millions of Americans overpay on their federal taxes simply because they miss deductions they are entitled to claim. Some of these deductions are obscure, while others are hiding in plain sight. Here are ten commonly overlooked tax deductions that deserve a closer look when you prepare your return.

Standard Deduction vs. Itemizing in 2026

Before diving into specifics, understand when itemizing makes sense. The standard deduction for the 2026 tax year is expected to be approximately $15,000 for single filers and $30,000 for married couples filing jointly.

You should only itemize if your total deductions exceed the standard deduction. However, several deductions below are above-the-line adjustments to income, meaning you can claim them regardless of whether you itemize.

1. State and Local Sales Tax

If you live in a state with no income tax, such as Texas, Florida, or Washington, you can deduct state and local sales tax instead of state income tax. This deduction is capped at $10,000 combined with other state and local taxes (the SALT cap), but it is still valuable for residents of no-income-tax states who might otherwise miss it entirely. The IRS provides tables based on your income and location to estimate your deduction, or you can track actual receipts if you made large purchases during the year.

2. Medical and Dental Expenses Above the Threshold

You can deduct unreimbursed medical and dental expenses that exceed 7.5 percent of your adjusted gross income. This includes doctor visits, surgeries, prescriptions, dental work, vision care, and travel to medical appointments. If you had a major medical event during the year, your expenses might easily cross the threshold.

3. Home Office Deduction

If you are self-employed and use a dedicated space exclusively and regularly for business, you can claim the home office deduction. The simplified method allows five dollars per square foot up to 300 square feet ($1,500 maximum). The regular method lets you deduct a proportional share of housing expenses. Note that W-2 employees working from home cannot claim this.

4. Student Loan Interest

You can deduct up to $2,500 in student loan interest, even without itemizing. This above-the-line deduction phases out at $80,000 for single filers and $165,000 for married couples filing jointly.

5. Charitable Mileage and Out-of-Pocket Expenses

Many people overlook mileage and costs incurred during volunteer work. You can deduct 14 cents per mile for charitable driving, plus parking and tolls. Out-of-pocket expenses like supplies or uniforms used while volunteering are also deductible.

6. Educator Expenses

Teachers, instructors, counselors, principals, and aides working at least 900 hours per school year can deduct up to $300 in unreimbursed classroom expenses. This is an above-the-line deduction. If both spouses are eligible educators filing jointly, each can claim $300 for a combined $600.

7. Health Savings Account Contributions

HSA contributions are tax-deductible even without itemizing. For 2026, limits are expected to be approximately $4,300 for individual coverage and $8,550 for family coverage, with an additional $1,000 catch-up for those 55 and older. HSAs offer triple tax advantages: deductible contributions, tax-free growth, and tax-free withdrawals for qualified medical expenses.

8. Moving Expenses for Active-Duty Military

While eliminated for most taxpayers in 2018, the moving expense deduction remains available for active-duty military members who move due to a permanent change of station order. Qualifying expenses include moving household goods, personal effects, and travel. Claim it on Form 3903.

9. Residential Energy Credits

The federal government offers valuable tax credits for energy-efficient home improvements. The Energy Efficient Home Improvement Credit covers insulation, energy-efficient windows and doors, heat pumps, and biomass stoves, with a credit of up to $3,200 per year for qualifying upgrades. The Residential Clean Energy Credit covers solar panels, solar water heaters, wind turbines, and geothermal heat pumps at 30 percent of installation cost with no annual maximum, making it extremely valuable for homeowners investing in renewable energy.

Remember that credits directly reduce your tax bill dollar for dollar, making them even more valuable than deductions of the same amount.

10. Self-Employment Tax Deduction

Self-employed individuals pay 15.3 percent in Social Security and Medicare taxes on net self-employment income. You can deduct the employer-equivalent portion (half of your self-employment tax) as an adjustment to income. This does not reduce your self-employment tax, but it lowers your income tax liability and can be worth thousands of dollars.

How to Make Sure You Are Not Missing Deductions

The best approach is keeping organized records throughout the year. Use a dedicated folder, spreadsheet, or app to track receipts, charitable donations, medical expenses, and business costs as they occur. Reconstructing a full year at tax time almost always means missing something.

Consider using tax preparation software like TurboTax or H&R Block that walks you through common deductions, or work with a qualified tax professional who can identify opportunities specific to your situation. Tax law changes regularly, and a few hours of research or a conversation with a CPA can easily save you hundreds or thousands of dollars.