What actually determines your refund size

Your refund is the difference between what you paid in taxes during the year and what you actually owed. The IRS does not decide how much you get back—you do, through the choices you make about withholding and deductions. A larger refund means you overpaid; a smaller one means you paid closer to what you actually owed. The goal of maximizing your refund is really the goal of reducing what you owe, which happens through three concrete levers: claiming deductions you missed, adjusting your withholding, and reporting all income correctly.

Most people think of a tax refund as a bonus, but it is actually your own money returned to you without interest. The IRS held it all year. If you want more of it back, you need to either pay less during the year (through withholding changes) or owe less when you file (through deductions and credits). Both require action on your part before or during tax season.

Key Takeaways

  • Your refund grows when you claim deductions and credits you have not claimed before—the standard deduction, child tax credits, education credits, and itemized deductions if they exceed the standard amount.
  • If you are a W-2 employee, you can increase your refund next year by lowering your withholding on your W-4 form, which tells your employer to take less tax from each paycheck.
  • Self-employed people and gig workers often get larger refunds by deducting business expenses, home office costs, and vehicle mileage that W-2 employees cannot claim.
  • Reporting all income—including 1099 forms, side work, and investment gains—is required; missing income shrinks your refund or creates a bill you did not expect.
  • The refund you receive this year depends on what you did last year; changes to withholding or deductions take effect on next year's return.

Deductions and credits that most people miss

The standard deduction is the first place most filers leave money on the table. For 2024, the standard deduction is $14,600 for single filers and $29,200 for married filing jointly. If you did not claim it, or if you claimed it but did not know it had increased from the prior year, you may have paid more tax than necessary. When you file, make sure you are claiming the standard deduction unless your itemized deductions (mortgage interest, property taxes, charitable donations, medical expenses) add up to more.

Child-related credits are the second major source of unclaimed refunds. The Child Tax Credit is $2,000 per child under 17, and the Child and Dependent Care Credit covers daycare or after-school care costs. If you have children and did not claim these, your refund is significantly smaller than it should be. The Earned Income Tax Credit (EITC) is a refundable credit for lower-income workers—meaning you can receive more back than you paid in—and many people who are may have access to to it do not claim it.

Education credits—the American Opportunity Credit (up to $2,500 per student) and the Lifetime Learning Credit (up to $2,000)—explore if you or a dependent paid for college tuition or fees. Student loan interest deduction (up to $2,500 per year) is separate and often overlooked. If you paid tuition or student loans last year and did not deduct them, that is refund money waiting to be claimed.

Deductions for self-employed and gig workers

If you received a 1099 form for freelance work, consulting, or gig economy income, you have access to deductions that W-2 employees do not. The home office deduction allows you to deduct a portion of your rent or mortgage, utilities, and internet if you use a dedicated space for work. You can calculate this as either a simplified rate ($5 per square foot, up to 300 square feet) or actual expenses. For someone paying $1,500 a month in rent and using 200 square feet as an office, that is $1,000 per month in deductible expenses.

Vehicle mileage is deductible at the IRS standard rate (67.5 cents per mile for 2024, though this changes yearly). If you drive for work—deliveries, client visits, job sites—keep a log and multiply your miles by the current rate. A person driving 10,000 work miles per year can deduct $6,750. This is one of the largest deductions self-employed people claim and one of the easiest to document.

Other business expenses—supplies, equipment, software subscriptions, professional development, meals with clients—are deductible if they are ordinary and necessary for your work. The key is keeping receipts and being able to explain why each expense is business-related. If you have been claiming 1099 income but not deducting these expenses, you are paying tax on your gross income rather than your profit, which inflates your bill and shrinks your refund.

Adjusting your withholding for next year

If you received a large refund this year, it means your employer withheld too much tax from your paychecks. You can change that by filing a new W-4 form with your employer. The W-4 tells your employer how much federal tax to take from each paycheck. If you claim more allowances or dependents on the form, less tax is withheld, which means larger paychecks now and a smaller refund (or a bill) next year.

The IRS provides a withholding calculator on its website (irs.gov) that asks about your income, deductions, and credits and tells you what to enter on your W-4. If you have a spouse who works, or if you have side income, the calculator accounts for that. The goal is to withhold just enough that you owe nothing and receive nothing back—though many people prefer to over-withhold slightly as a forced savings mechanism.

Changes to your W-4 take effect on your next paycheck, so if you file a new W-4 in January, you will see the change in February's pay. This does not affect your current-year refund; it affects next year's. If you want a larger refund this year, you need to claim deductions and credits on your tax return, not change your withholding.

Income you must report to avoid losing your refund

Every dollar of income you receive must be reported, or the IRS will catch it and reduce your refund. This includes W-2 wages, 1099 contractor income, interest and dividends, capital gains from selling investments, rental income, and cash tips. If you received a 1099 form, the IRS received a copy too. If you do not report it, the IRS will match its records to yours and either reduce your refund or send you a bill.

Many people receive income they do not think to report: a small amount of interest from a savings account, dividends from stocks, a one-time payment for selling something online, or cash from a side job. If the amount is small, you might think it does not matter. It does. The IRS system is automated; if a 1099 is filed in your name and you do not report it, your return will be flagged. Reporting all income is not optional—it is the foundation of getting the refund you are actually may have access to to.

What to do if your income changed mid-year

If you started a new job, lost a job, got married, or had a major life change during the year, your withholding may no longer match your actual tax bill. A person who was unemployed for six months and then hired in July will have had too much withheld in the months they worked (because the W-4 assumes a full year of income). That person will likely receive a larger refund. Conversely, someone who left a job in June and started a higher-paying job in September may have under-withheld.

If you experienced a major change, you can file a new W-4 with your current employer to adjust your withholding for the rest of the year. You can also claim the change on your tax return when you file. The IRS allows you to account for income that was not withheld or was over-withheld by adjusting your estimated tax payments or claiming it on your return. If you are unsure whether you will owe or receive a refund, file your return and let the IRS calculate it based on your actual income and deductions.

Common mistakes that reduce your refund

Claiming the wrong filing status shrinks your refund because each status has a different standard deduction and tax brackets. If you are married and file as single, you will pay more tax than necessary. If you are single and claim head of household (which requires you to pay more than half the household expenses for a dependent), you need to make sure you actually meet that test.

Forgetting to claim a dependent is another frequent error. If a child, parent, or other relative lived with you for more than half the year and you paid more than half their expenses, you can usually claim them as a dependent. Each dependent increases your standard deduction and may open up additional credits. Missing this costs you hundreds of dollars in refund.

Not keeping receipts for deductions you claim is risky. If you claim a home office deduction, charitable donations, or medical expenses, the IRS may ask for proof. If you cannot provide it, you lose the deduction and owe back taxes plus penalties. Keep receipts, bank statements, and mileage logs for at least three years.

Frequently Asked Questions

Can I get a larger refund by claiming deductions I did not claim last year?

Yes. If you missed deductions or credits on a prior-year return, you can file an amended return (Form 1040-X) for that year. You have three years from the original filing date to claim a refund. Common missed deductions include education credits, the child tax credit, and business expenses for self-employed people.

What is the difference between a deduction and a credit?

A deduction reduces your taxable income, which lowers the tax you owe. A credit directly reduces the tax you owe dollar-for-dollar. A $1,000 credit is worth more than a $1,000 deduction. Refundable credits (like the EITC) can result in a refund even if you owe no tax.

If I lower my withholding on my W-4, will I owe money when I file?

Not necessarily. Lowering your withholding means less tax is taken from your paychecks, so you have more money now. When you file, your refund will be smaller (or you may owe a small amount) because you paid less during the year. The total tax you owe does not change—only when you pay it.

Do I have to report income under $600?

Yes. The IRS requires you to report all income, regardless of amount. Some 1099 forms are not issued unless income exceeds $600, but that does not mean you can skip reporting smaller amounts. Report everything you earned.

Can I claim a deduction for something I did not pay for?

No. You can only deduct expenses you actually paid. If someone else paid your tuition or medical bills, you cannot deduct them. If you paid them with a loan, you can deduct the interest you paid, but not the principal.