What actually determines your refund amount
Your refund is not something you negotiate or increase through effort. It is the difference between what you paid in taxes during the year and what you actually owed. If you paid $5,000 and owed $3,000, you get $2,000 back. To change that number, you have to change either what you paid in or what you owed.
Most people control what they pay in through their W-4 form at work, which tells their employer how much to withhold from each paycheck. The more you withhold, the larger your refund will be—but that money came from your paychecks all year. You are not gaining anything; you are just getting your own money back later instead of having it now.
What you owe depends on your income, your filing status, and what deductions and credits you can claim. Some of these you control. Some you do not.
Key Takeaways
- A larger refund means you overpaid taxes during the year, so you are getting your own money back—not gaining extra money.
- You can increase withholding on your W-4 to have more taken from each paycheck, which will result in a bigger refund but smaller paychecks.
- Tax deductions and credits you may not know about—like the Earned Income Tax Credit or education credits—can lower what you owe and increase your refund.
- Reporting all income sources, including side work and investment earnings, is required, but missing income is one of the most common reasons refunds are smaller than expected.
- If you are married filing jointly, your spouse's income and deductions affect your refund too, so both of you need to report everything.
Adjust your W-4 withholding if you want more withheld
The W-4 is the form you fill out when you start a job. It tells your employer how much federal income tax to take from each paycheck. If you want a larger refund, you can ask your employer to withhold more by submitting a new W-4.
To do this, go to your HR or payroll department and ask for a W-4 form. The IRS also publishes the form on irs.gov. On the form, you can claim fewer allowances or enter an additional amount to withhold. The fewer allowances you claim, the more your employer will take out. If you enter an additional amount—say, $50 per paycheck—that amount gets withheld on top of the standard calculation.
This approach works, but understand what it costs you: smaller paychecks now in exchange for a larger refund later. If you need the money to live on, this is not a good trade. If you consistently get large refunds, it usually means you are withholding too much and could use that money during the year instead.
Claim deductions you may have missed
Deductions reduce the income you owe tax on. The more deductions you claim, the less you owe, and the larger your refund becomes (assuming you paid the same amount in withholding).
Most people take the standard deduction, which is a flat amount set by the IRS each year. For 2024, it is $14,600 for single filers and $29,200 for married couples filing jointly. You do not have to list anything; you just claim it on your return.
Some people benefit from itemizing deductions instead—listing specific expenses like mortgage interest, property taxes, charitable donations, or medical expenses. Itemizing only makes sense if your total deductions exceed the standard deduction. If you own a home, donate regularly to charity, or had large medical bills, it is worth calculating both ways to see which is larger.
Self-employed people and people with side income can deduct business expenses—supplies, equipment, a portion of home office rent, mileage, and more. These deductions can be substantial and are often overlooked.
Look for tax credits you may have access to for
Credits are more valuable than deductions because they reduce your tax dollar-for-dollar rather than just reducing your taxable income. A $1,000 credit saves you $1,000 in tax. A $1,000 deduction saves you tax only on that $1,000 of income—usually $100 to $370 depending on your tax bracket.
The Earned Income Tax Credit (EITC) is one of the largest. If you work and earn below a certain income threshold, you may may have access to. The credit phases in as your income rises, peaks, and then phases out. For 2024, the maximum credit ranges from $600 to $3,995 depending on whether you have children and how many. You do not have to have children to claim it, but the amount is larger if you do.
The Child Tax Credit is $2,000 per child under 17. The Child and Dependent Care Credit helps if you paid for childcare so you could work. The American Opportunity Tax Credit and Lifetime Learning Credit explore to education expenses. The Saver's Credit rewards retirement savings if you earn below certain thresholds.
These credits are not automatic. You have to claim them on your return. If you did not claim them in prior years and you still have time to file an amended return, you may be able to go back and claim them.
Report all income sources, including side work
If you have income that is not reported to the IRS on a W-2 or 1099 form—freelance work, gig work, cash tips, rental income, investment income—you still have to report it on your tax return. Many people do not, either because they forget or because they think it will not be caught.
Unreported income is one of the most common reasons refunds are smaller than expected, because the IRS matches what you report to what employers and financial institutions report about you. If there is a mismatch, the IRS will send you a notice asking you to explain the difference. You will owe the tax you should have paid, plus interest and penalties.
If you have side income, keep records of what you earned. If you received a 1099 form, the IRS has a copy too, so you must report it. If you did not receive a 1099 but earned over $600, you should still report it. If you earned less than $600, the law does not require a 1099 to be issued, but you still owe tax on it.
Make sure your filing status is correct
Your filing status—single, married filing jointly, married filing separately, head of household, or may have access to widow(er)—determines your tax brackets and standard deduction. Choosing the wrong status can cost you money.
If you are married, filing jointly almost always results in a lower total tax than filing separately. If you are unmarried but support a dependent, you may may have access to for head of household status, which has better tax brackets than single status. If your spouse died in the last two years and you have a dependent, you may may have access to for may have access to widow(er) status.
Your filing status on December 31 of the tax year is what matters. If you got married or divorced during the year, that affects which status you use for that year.
Review your return before you file it
Mistakes on your return—a transposed Social Security number, income reported twice, a dependent claimed by two people—can trigger IRS notices and reduce your refund. Before you file, check that all names, numbers, and amounts match your documents.
If you use tax software, it will catch some errors. If you work with a tax professional, they will review it. If you prepare your own return by hand, take time to verify every number against your W-2s, 1099s, receipts, and prior-year return.
If you discover an error after you file, you can file an amended return using Form 1040-X. The IRS processes amended returns more slowly than original returns, so your refund will take longer.
Frequently Asked Questions
If I increase my W-4 withholding, will I get a bigger refund?
Yes, but you will have smaller paychecks during the year. You are not gaining money—you are just getting your own money back later. If you need cash now, this is not a good strategy.
Can I claim a deduction for something I did not actually pay for?
No. Deductions must be for real expenses you incurred. The IRS can ask you to prove them with receipts, invoices, or bank statements. Claiming false deductions can result in penalties and interest.
What if I think I missed a credit on a prior year return?
You can file an amended return for the past three years using Form 1040-X. The IRS processes these slowly, sometimes taking six months or more. If you are owed a refund, you will receive it after the amended return is processed.
Do I have to report income if I earned less than $600?
The law does not require a 1099 to be issued for income under $600, but you still owe tax on it and should report it on your return. Unreported income can trigger an IRS notice later.
If I am married, should we file jointly or separately?
Filing jointly almost always results in lower total tax. Filing separately can make sense only in specific situations, like if one spouse has large medical expenses or casualty losses. Run the numbers both ways or ask a tax professional.