Last-Minute Tax Deductions You Might Be Missing in 2026

The April 15 deadline is approaching. Most people are focused on getting their return filed — not on finding legitimate deductions they're entitled to. That's a mistake that can cost hundreds or thousands of dollars.

Some of these opportunities close on April 15. Others require you to act before you file. Here's what to check before you submit.

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Actions You Can Still Take Before Filing

These aren't just deductions to claim — they're moves you can make right now, in March or early April, that reduce your 2025 tax bill.

1. Contribute to a Traditional IRA

You have until April 15, 2026 to make a 2025 IRA contribution. The limit is $7,000 ($8,000 if you're 50 or older). If you're eligible for a deduction (depends on income and whether you or your spouse has a workplace retirement plan), a maxed-out traditional IRA reduces your taxable income by up to $7,000-$8,000.

Who qualifies for the deduction:

• Single filers without a workplace plan: Always deductible regardless of income
• Single filers with a workplace plan: Fully deductible up to $77,000 MAGI; partially deductible to $87,000
• Married filers (covered by plan): Fully deductible up to $123,000; partially to $143,000

Even if you don't qualify for the deduction, a Roth IRA contribution grows tax-free — worth making if you're within the income limits ($150,000 single; $236,000 married filing jointly for 2025).

2. Contribute to an HSA

If you have a high-deductible health plan (HDHP), you can still contribute to your Health Savings Account (HSA) for 2025 until April 15. The 2025 limits are $4,150 for self-only coverage and $8,300 for family coverage, plus a $1,000 catch-up contribution if you're 55 or older.

HSA contributions are triple tax-advantaged: deductible on the way in, grow tax-free, and come out tax-free when used for medical expenses. This is one of the best tax-advantaged vehicles available. An HSA contribution made today reduces your 2025 taxable income dollar-for-dollar.

3. Contribute to a Solo 401(k) or SEP-IRA (Self-Employed)

If you're self-employed, the deadline for employer contributions to a Solo 401(k) or SEP-IRA is generally the extended due date of your return (October 15 if you file for an extension). But employee contributions to a Solo 401(k) had to be made by December 31, 2025.

For SEP-IRAs, you can contribute up to 25% of net self-employment income (up to $69,000 for 2025). If you file for an extension, you have until October 15 to fund it.

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Deductions Many Filers Miss

4. Home Office Deduction (Self-Employed and Business Owners)

If you're self-employed, a freelancer, or a business owner, and you use part of your home regularly and exclusively for business, you can deduct it. The simplified method lets you deduct $5 per square foot (up to 300 square feet = $1,500 maximum) without complex calculations. The actual expense method captures more value if your home office is large.

Note: Remote employees working for a company cannot take the home office deduction under current law. This applies only to self-employment income.

5. Self-Employed Health Insurance Premiums

If you're self-employed and paid for your own health insurance, you can deduct 100% of premiums for yourself and your family as an adjustment to income — not just as an itemized deduction, which means it reduces your AGI even if you take the standard deduction.

This includes dental and long-term care premiums. The deduction cannot exceed your business's net profit.

6. Student Loan Interest

You can deduct up to $2,500 in student loan interest paid in 2025 as an above-the-line deduction — meaning you get it even if you take the standard deduction. The deduction phases out between $75,000 and $90,000 AGI (single) or $155,000 and $185,000 (married filing jointly).

Your loan servicer should have sent a Form 1098-E. If you paid interest and haven't received it, contact your servicer or check your online account.

7. Educator Expenses

Teachers who pay out-of-pocket for classroom supplies can deduct up to $300 (or $600 for two educators filing jointly). This is an above-the-line deduction requiring no itemizing. If you're a teacher who bought supplies for your classroom in 2025, this deduction is easy money you shouldn't leave on the table.

8. Energy Efficiency Credits

The Inflation Reduction Act significantly expanded energy efficiency tax credits:

Energy Efficient Home Improvement Credit (25C): 30% of the cost of qualifying improvements, up to $3,200 per year. Eligible improvements include:

• Heat pumps (up to $2,000)
• Insulation and air sealing (up to $1,200)
• Energy-efficient windows and doors (up to $600)
• Electrical panel upgrades (up to $600)

Residential Clean Energy Credit (25D): 30% of the cost of solar panels, solar water heaters, battery storage, and other clean energy installations. No dollar cap.

If you made home improvements in 2025, check whether they qualify. These are credits (not just deductions), meaning they directly reduce your tax bill dollar-for-dollar.

9. Charitable Contributions (Including Non-Cash)

If you itemize, charitable contributions are deductible. But many filers miss non-cash contributions:

• Clothing and household goods donated to Goodwill, Salvation Army, or similar organizations are deductible at fair market value
• Vehicle donations (with Form 1098-C from the charity)
• Investment in charitable causes through donor-advised funds

For cash contributions, the deduction is straightforward. For non-cash, use IRS Publication 561 to determine fair market value. Donations worth more than $500 require Form 8283.

10. Investment Losses

If you sold investments at a loss in 2025, those losses offset capital gains. If your losses exceed gains, you can deduct up to $3,000 against ordinary income — and carry forward the rest to future years.

Many people realize gains without remembering to pair them with losses. Your brokerage's 1099-B will show this. Review it carefully before filing.

11. Business Expenses for Freelancers and Gig Workers

If you had any 1099 income — freelancing, consulting, rideshare driving, selling on marketplaces — you're running a business. Deductible expenses include:

• Software subscriptions used for work (Adobe Creative Cloud, project management tools, etc.)
• Professional development (courses, books, conferences related to your work)
• Home internet (proportional to business use)
• Phone (proportional to business use)
• Vehicle mileage for business purposes (67 cents/mile in 2025)
• Professional services (accounting fees attributable to business income)

These reduce your Schedule C income, which reduces both income tax and self-employment tax (the SE tax is 15.3% on the first $168,600 of net self-employment income — every deduction here is doubly valuable).

12. Medical Expenses Above 7.5% of AGI

If you itemize and had significant medical expenses, amounts exceeding 7.5% of your AGI are deductible. Most people don't hit this threshold, but those with major out-of-pocket medical expenses (surgery, dental work, AI Tools for Therapists and Mental Health Professionals in 2026" class="internal-link">mental health care) should calculate whether they're above the floor.

Qualifying expenses include premiums not paid through an employer, out-of-pocket costs, prescription drugs, and qualified medical equipment.

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Credits That Directly Reduce Your Tax Bill

Credits are more valuable than deductions — they reduce your tax dollar-for-dollar rather than just reducing taxable income.

Child Tax Credit: Up to $2,000 per qualifying child under 17. Partially refundable.

Child and Dependent Care Credit: If you paid for childcare so you could work, up to $3,000 in expenses for one child ($6,000 for two or more) can qualify for a credit of 20-35% depending on income.

Earned Income Tax Credit (EITC): For lower-income working individuals and families. The maximum credit for 2025 is $7,830 (with three or more qualifying children). Many filers who qualify don't claim it. Check the IRS EITC assistant tool if your income is under $63,398 (single/head of household with three kids).

American Opportunity Credit / Lifetime Learning Credit: For tuition paid for higher education. The American Opportunity Credit is up to $2,500 for the first four years of college; the Lifetime Learning Credit is up to $2,000 for any year.

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Don't Forget These Documentation Issues

Before you file, make sure you have:

• All W-2s from every employer
• 1099-NECs for freelance income
• 1099-INTs for bank interest
• 1099-DIVs for dividends
• 1099-Bs for investment sales (with cost basis)
• 1098 for mortgage interest
• 1098-E for student loan interest
• 1098-T for tuition
• Receipts for charitable donations

Missing a 1099 doesn't mean you skip reporting the income — the IRS has a copy too. But missing a 1098-E or 1098-T means leaving a deduction on the table.

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The April 15 Deadline and Extensions

If you can't file by April 15, Form 4868 gives you an automatic 6-month extension (to October 15, 2026). But it doesn't extend the time to pay. If you estimate you owe, pay an estimate by April 15 or face the failure-to-pay penalty (0.5% per month) and interest.

If you're owed a refund, there's technically no penalty for late filing — but you forfeit a refund if you don't claim it within 3 years.

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For a comprehensive guide to every deduction available, J.K. Lasser's Your Income Tax 2026 is updated annually and covers every schedule and form in detail — the reference most tax professionals keep on their desk.

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