Tax Season Checklist: Deductions You Might Be Missing

Before You Start: Documents You Need

The single biggest reason people miss deductions is that they do not have the right paperwork in front of them when they sit down to file. Before you open any tax software or visit your accountant, gather the following documents:

• W-2 forms — One from every employer you worked for during the tax year. These show your total wages, federal and state taxes withheld, Social Security and Medicare contributions, and any pre-tax benefits like 401(k) contributions.
• 1099 forms — You may receive several types. A 1099-NEC reports freelance or independent contractor income. A 1099-INT reports bank interest. A 1099-DIV covers investment dividends. A 1099-B reports brokerage transactions. A 1099-R covers retirement distributions. If you received any income outside a traditional employer, there is likely a 1099 for it.
• Form 1098 (Mortgage Interest Statement) — Your lender sends this if you paid mortgage interest during the year. This is essential if you plan to itemize deductions.
• Form 1098-E (Student Loan Interest Statement) — Your loan servicer reports how much student loan interest you paid. You can deduct up to $2,500 even if you take the standard deduction.
• Charitable donation receipts — Keep written acknowledgments for all donations over $250. For smaller donations, bank statements or written receipts from the organization are sufficient. Log any miles driven for charitable purposes as well.
• Medical and dental expense receipts — Collect records for out-of-pocket expenses including copays, prescriptions, surgeries, dental work, vision care, and health insurance premiums you paid with after-tax dollars.
• HSA and FSA statements — Form 5498-SA shows your Health Savings Account contributions. Your FSA administrator will provide a summary of Flexible Spending Account activity. HSA contributions are one of the most powerful tax deductions available, and many people underutilize them.

Having all of these documents organized before you begin eliminates the guesswork and ensures you claim every deduction supported by your records.

Standard Deduction vs Itemizing

One of the most consequential decisions on your tax return is whether to take the standard deduction or itemize your deductions. The standard deduction is a flat dollar amount that reduces your taxable income, no receipts required. For the 2025 tax year, the standard deduction amounts are:

Itemizing makes sense only when the total of your individual deductions exceeds your standard deduction amount. For most filers, the standard deduction is the better choice, especially since the Tax Cuts and Jobs Act of 2017 nearly doubled the standard deduction while capping several itemized deductions. However, homeowners with large mortgage balances, people in high-tax states, and those with significant charitable giving or medical expenses should always run the numbers both ways.

A simple breakeven analysis is straightforward: add up your mortgage interest, state and local taxes (up to $10,000), charitable contributions, and qualifying medical expenses. If that total exceeds your standard deduction, itemize. If not, take the standard deduction and save yourself the paperwork. You can use our tax calculator to model both scenarios and see which produces a lower tax bill.

Commonly Missed Deductions

Even experienced filers overlook these deductions year after year. Go through this list carefully and check whether any apply to your situation.

State and Local Taxes (SALT)

You can deduct state and local income taxes or sales taxes, plus property taxes, up to a combined cap of $10,000 ($5,000 if married filing separately). If you live in a state with high income tax or property tax, you are likely hitting this cap. While the cap limits the deduction, it is still $10,000 that many people forget to claim when they switch from itemizing to the standard deduction without checking.

Home Office Deduction

If you use a dedicated space in your home regularly and exclusively for business, you may qualify for the home office deduction. The simplified method allows you to deduct $5 per square foot of your home office, up to a maximum of 300 square feet, for a maximum deduction of $1,500. This deduction is available to self-employed individuals and independent contractors. W-2 employees working from home generally cannot claim it under current federal law.

Student Loan Interest

You can deduct up to $2,500 in student loan interest paid during the year. This is an above-the-line deduction, meaning you can claim it even if you take the standard deduction. The deduction phases out at higher income levels, but for many young professionals still paying off education debt, this is free money they overlook.

Educator Expenses

Teachers, counselors, principals, and aides who work at least 900 hours in a school year can deduct up to $300 in unreimbursed classroom expenses. This covers books, supplies, computer equipment, and supplementary materials. If both spouses are eligible educators filing jointly, the deduction doubles to $600.

HSA Contributions

Contributions to a Health Savings Account are tax-deductible, grow tax-free, and can be withdrawn tax-free for qualified medical expenses. This triple tax advantage makes HSAs one of the most powerful tax tools available. For 2025, the contribution limits are $4,300 for individual coverage and $8,550 for family coverage, with an additional $1,000 catch-up contribution for those 55 and older.

Charitable Contributions

Cash donations to qualified organizations are deductible if you itemize. But do not forget non-cash contributions. Donated clothing and household goods are deductible at fair market value. If you drove your personal vehicle for charitable work, you can deduct 14 cents per mile. Volunteer expenses like supplies purchased for a nonprofit event also count. Keep detailed logs and receipts for everything.

Medical Expenses

If your total unreimbursed medical and dental expenses exceed 7.5% of your adjusted gross income (AGI), you can deduct the amount above that threshold. For someone with an AGI of $60,000, that means expenses exceeding $4,500 become deductible. This includes health insurance premiums paid with after-tax dollars, prescription medications, surgeries, dental work, vision care, mental health services, and even mileage to and from medical appointments.

Moving Expenses (Military Only)

Under current tax law, the moving expense deduction is available only to active-duty members of the Armed Forces who move due to a military order for a permanent change of station. If you qualify, you can deduct reasonable moving costs including transportation, lodging, and shipping of household goods.

Tax Credits vs Deductions

Understanding the difference between a tax credit and a tax deduction is crucial because they affect your tax bill in fundamentally different ways.

A deduction reduces your taxable income. If you are in the 22% tax bracket and claim a $1,000 deduction, it saves you $220 in taxes. The value of a deduction depends on your marginal tax rate.

A credit reduces your tax bill dollar for dollar. A $1,000 tax credit saves you exactly $1,000 in taxes, regardless of your tax bracket. This makes credits significantly more valuable than deductions of the same amount.

Some credits are refundable, meaning you receive the full credit amount even if it exceeds your total tax liability. Others are nonrefundable, meaning they can reduce your tax bill to zero but no further. Knowing which credits you qualify for can save you hundreds or even thousands of dollars.

Credits You Should Claim

Tax credits are the most direct way to reduce what you owe. Review each of these carefully, because many filers qualify for credits they do not realize exist.

Child Tax Credit

The Child Tax Credit provides up to $2,000 per qualifying child under age 17. A portion of this credit is refundable, meaning you can receive it even if you owe no federal income tax. Income phaseouts begin at $200,000 for single filers and $400,000 for married filing jointly. If you have children, this is likely the largest single credit on your return.

Earned Income Tax Credit (EITC)

The EITC is designed for low- to moderate-income workers and can be worth thousands of dollars. For 2025, the maximum credit ranges from approximately $632 for filers with no children to over $7,800 for filers with three or more qualifying children. The EITC is fully refundable. Millions of eligible taxpayers fail to claim it every year, often because they do not realize they qualify.

Saver's Credit

If you contributed to a retirement account (401(k), IRA, or similar plan) and your income is below certain thresholds, you may qualify for the Retirement Savings Contributions Credit. This credit is worth up to $1,000 for single filers or $2,000 for married couples filing jointly. It is a direct reward for saving for retirement, on top of the deduction you already get for the contribution itself.

Lifetime Learning Credit

This credit provides up to $2,000 per tax return for qualified education expenses, including tuition and fees for undergraduate, graduate, and professional degree courses. Unlike the American Opportunity Credit, there is no limit on the number of years you can claim it. If you took any courses to improve your job skills or advance your education, check whether you qualify.

Child and Dependent Care Credit

If you paid for childcare or dependent care so that you could work or look for work, you may claim a credit of 20% to 35% of qualifying expenses, depending on your income. Qualifying expenses are capped at $3,000 for one dependent or $6,000 for two or more. This covers daycare, babysitters, day camps, and care for a disabled spouse or dependent.

Energy Efficiency Credits

Federal tax credits are available for energy-efficient home improvements. Installing solar panels, heat pumps, insulation, energy-efficient windows, or qualified HVAC systems can qualify you for credits under the Residential Clean Energy Credit or the Energy Efficient Home Improvement Credit. These credits can be worth thousands of dollars and are designed to offset the upfront cost of making your home more energy efficient.

Retirement Contribution Strategies

Your retirement contributions do double duty: they build your future wealth and reduce your current tax bill. Understanding how to use these tools strategically can save you significant money every year.

Traditional IRA Deduction

Contributions to a traditional IRA may be fully or partially deductible depending on your income and whether you or your spouse are covered by an employer retirement plan. For 2025, the contribution limit is $7,000, or $8,000 if you are 50 or older. If you qualify for the full deduction and are in the 22% bracket, a $7,000 contribution saves you $1,540 in taxes.

401(k) Pre-Tax Contributions

Contributions to a traditional 401(k) are made with pre-tax dollars, which directly reduces your taxable income for the year. For 2025, you can contribute up to $23,500, or $31,000 if you are 50 or older. Many employers offer a matching contribution, which is essentially free money. If you are not contributing enough to get the full employer match, you are leaving compensation on the table.

Saver's Credit for Lower-Income Filers

As mentioned in the credits section, contributing to a retirement account when your income is below certain thresholds entitles you to the Saver's Credit on top of the tax deduction. This means a single dollar contributed to your IRA or 401(k) could reduce your tax bill by your marginal tax rate (through the deduction) plus an additional 10% to 50% (through the credit). For eligible filers, this is one of the most efficient tax-reduction strategies available.

Self-Employment Deductions

If you earn income as a freelancer, independent contractor, or small business owner, you have access to a range of deductions that W-2 employees cannot claim. Missing these deductions means overpaying your taxes by potentially thousands of dollars.

Self-Employment Tax Deduction

Self-employed individuals pay both the employer and employee portions of Social Security and Medicare taxes, totaling 15.3% on net earnings. However, you can deduct the employer-equivalent portion (7.65%) from your adjusted gross income. This is an above-the-line deduction that you claim regardless of whether you itemize.

Home Office

As a self-employed individual, you can deduct the business use of your home using the simplified method ($5 per square foot, up to $1,500) or the regular method, which requires calculating the actual percentage of your home used for business and applying that percentage to your rent or mortgage, utilities, insurance, and repairs. The regular method is more work but often produces a larger deduction.

Health Insurance Premiums

If you are self-employed and not eligible for employer-sponsored health insurance through a spouse, you can deduct 100% of your health insurance premiums for yourself, your spouse, and your dependents. This includes medical, dental, and qualifying long-term care insurance. This is an above-the-line deduction, so it reduces your AGI directly.

Business Expenses

Ordinary and necessary business expenses are deductible. This includes computer equipment, software subscriptions, office supplies, professional development courses, business travel, advertising costs, and professional services like accounting and legal fees. Keep meticulous records and save every receipt. A dedicated business credit card or bank account makes tracking these expenses dramatically easier.

Retirement Plans (SEP IRA and Solo 401(k))

Self-employed individuals can contribute to retirement plans with significantly higher limits than traditional IRAs. A SEP IRA allows contributions of up to 25% of net self-employment earnings, to a maximum of $70,000 for 2025. A Solo 401(k) allows employee contributions of $23,500 plus employer contributions, with a combined maximum of $70,000. If you are 50 or older, catch-up contributions increase these limits further. Use our take-home pay calculator to see how these contributions affect your bottom line.

Common Filing Mistakes

Even small errors on your tax return can trigger delays, audits, or missed refunds. Here are the most common mistakes to avoid:

• Choosing the wrong filing status — Your filing status affects your standard deduction, tax brackets, and eligibility for credits. If you are unmarried with a qualifying dependent, filing as Head of Household instead of Single gives you a larger standard deduction and more favorable tax brackets. Make sure you select the most advantageous status you legitimately qualify for.
• Forgetting to report all income — The IRS receives copies of every W-2, 1099, and K-1 issued to you. If your return does not match their records, expect a notice. This is especially common for people with multiple freelance clients, bank accounts earning interest, or investment accounts generating dividends.
• Math errors — Simple arithmetic mistakes remain one of the top reasons the IRS sends correction notices. If you are filing by hand, double-check every calculation. If you are using software, verify that you entered all numbers correctly.
• Forgetting your state return — Filing your federal return does not automatically file your state return. Most states with an income tax require a separate filing. If you worked in multiple states, you may owe returns in each one.
• Not signing the return — An unsigned return is treated as if it was never filed. If filing jointly, both spouses must sign. Electronic filers use a PIN or prior-year AGI to sign digitally.

Important Deadlines

Missing a tax deadline can mean penalties, interest charges, or forfeiting your refund. Mark these dates on your calendar:

If you cannot file by April 15, file Form 4868 to request an automatic six-month extension. This extends your filing deadline to October 15, but it does not extend the deadline to pay. If you owe taxes, you must estimate your liability and pay by April 15 to avoid penalties and interest. If you are owed a refund, there is no penalty for filing late, but there is no reason to delay receiving your money.

Frequently Asked Questions