10 Tax Deductions Often Overlooked on 2025 Returns

A surprising number of write-offs get missed each year simply because taxpayers assume they do not qualify, take the standard deduction without checking itemized options, or lack receipts and logs. For returns filed in 2025 (generally reporting 2024 income for most individuals), the key is separating myths from rules: some deductions are above-the-line adjustments, others require itemizing on Schedule A, and a few apply only to self-employed filers. Below are 10 commonly missed deductions, organized by the areas where they most often appear.

Hidden Education and Student Loan Deductions

1) Student loan interest deduction (up to the allowed limit). If you paid interest on qualified student loans, you may be able to deduct student loan interest as an adjustment to income, even if you do not itemize. Eligibility can phase out at higher incomes, and only interest on qualified loans counts (not personal loans from family unless they meet the requirements). Your lender may issue Form 1098-E, but it is still possible to have qualifying interest without a form (for example, certain servicer reporting situations).

2) Self-employed education that maintains or improves skills. W-2 employees generally cannot deduct unreimbursed employee expenses under current federal rules, but self-employed individuals may be able to deduct ordinary and necessary education costs on Schedule C if the education maintains or improves skills in their current business (and does not qualify them for a new trade or business). Typical examples include continuing education courses, required licenses, and job-related certifications for freelancers.

Uncommon Medical and Dental Expense Write-offs

3) Medical and dental travel costs. If you itemize medical expenses, you can include certain travel costs that are primarily for and essential to medical care. This often includes mileage driven to appointments (at the IRS medical mileage rate for the relevant year), parking fees, and tolls. People frequently keep receipts for copays but forget mileage logs. The trip must be mainly for medical care, and good records matter.

4) Home improvements made for medical necessity. Some medically necessary home changes may be included as medical expenses when you itemize, such as installing ramps or modifying bathrooms for accessibility. In many cases, only the portion of the cost that exceeds any increase in the home’s value can be counted, which means documentation is important (invoices, medical recommendation, and sometimes an appraisal concept). These can be overlooked because they feel like home projects rather than healthcare-related expenses.

5) Health Savings Account (HSA) contributions. If you are eligible for an HSA (generally tied to having a qualifying high-deductible health plan), your own contributions may be deductible as an adjustment to income, subject to annual limits. Contributions made through payroll often already reduce taxable wages, but direct contributions may be deductible on your return if they were not excluded from income. A common miss is assuming only payroll deductions count, or forgetting a last-minute contribution made before the filing deadline for the prior tax year.

Maximizing Home Office and Remote Work Benefits

6) Home office deduction for self-employed or gig work. A home office deduction is not available just because you sometimes work from home as an employee, but it may be available if you have self-employment income (including side gigs) and use part of your home regularly and exclusively as your principal place of business. Eligible costs can include a share of rent, mortgage interest, property taxes, utilities, and insurance. The simplified method is based on square footage, while the regular method uses actual expenses; either way, the exclusivity and regular use tests are where most mistakes happen.

7) Business portion of internet, phone, and supplies (self-employed). For self-employed filers, ordinary and necessary expenses used in the business can be deductible, including a business portion of internet service, a dedicated business phone line, software subscriptions, shipping supplies, and similar items. The frequently overlooked part is substantiation and allocation: if an expense is mixed personal and business, you generally need a reasonable method to divide it (and to keep records showing the business purpose).

Tax Breaks for Charitable Contributions and Volunteers

8) Out-of-pocket volunteer expenses. Time spent volunteering is not deductible, but certain unreimbursed expenses you pay while volunteering for a qualified organization may be. This can include supplies purchased for the organization and mileage driven for volunteer work (using the charitable mileage rate), plus parking and tolls. The organization should be a qualified charity, and records should show what you did, when, and what you paid.

9) Noncash donations with proper documentation. Donations of clothing, household goods, and other property to qualified charities can be deductible if you itemize and the items are in acceptable condition. The deduction is generally based on fair market value, not what you originally paid. People often miss this because they drop items off without getting a receipt, fail to keep a detailed list, or do not document higher-value donations that may require additional reporting (such as Form 8283 for certain noncash contributions).

Overlooked Deductions for State and Local Taxes

10) State and local tax deductions you may not be maximizing. If you itemize, you can generally deduct certain state and local taxes up to the federal SALT cap (a combined limit that may apply depending on current law for the year you are filing). Commonly missed pieces include: - Choosing the better option between state and local income taxes versus state and local sales taxes (sales tax can matter more in states without an income tax or after major purchases). - Personal property taxes assessed annually on items like vehicles, when the tax is based on value and charged yearly. Also note that property taxes are generally deductible only when assessed and paid to a taxing authority, and prepaying taxes that are not yet assessed may not be deductible.

In practice, whether these deductions reduce tax depends on your filing profile: itemizers may benefit from medical, charitable, and SALT deductions, while many education- and self-employment-related deductions can apply even when taking the standard deduction. The most reliable way to avoid missing legitimate write-offs is maintaining simple records all year: mileage logs, charity receipts, invoices, and clear notes separating business and personal spending.