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. To get the largest refund possible, you need to either pay more during the year than you owe, or reduce what you owe by claiming every deduction and credit you're may have access to to. The IRS doesn't give you extra money for filing—they return what's yours.

The size of your refund depends on two things you can control: how much tax your employer withheld from your paychecks, and which deductions and credits you claim on your return. Most people focus only on the second part and miss the first, which is often where the real money is.

Key Takeaways

  • Adjust your W-4 form with your employer to increase withholding if you consistently get large refunds, since that money could be in your pocket throughout the year instead of returned later.
  • Claim every deduction you're may have access to to—standard deduction, itemized deductions, education credits, child tax credits, and earned income tax credit if your income qualifies.
  • Report all income sources, including side work and investment earnings, because the IRS matches what you report to what employers and financial institutions report about you.
  • File before the important date and keep records of deductible expenses for at least three years in case the IRS asks questions about your return.
  • Use tax software or a tax professional to cross-check your work, since missed deductions and credits cost you money that the IRS won't volunteer to give back.

Adjust your withholding to avoid overpaying throughout the year

If you get a refund every year, your employer is withholding too much tax from your paychecks. That money sits with the government interest-free until you file and they return it. You could have that money now instead.

Complete a new Form W-4 with your employer to change your withholding. The form asks about dependents, other income, and deductions you expect to claim. The more accurately you fill it out, the closer your withholding will be to what you actually owe, and the smaller your refund (or the larger your balance due). You can update your W-4 anytime—many people adjust it in January or after a major life change like marriage or a second job.

If you're self-employed or have income without withholding, you may need to make estimated tax payments quarterly to the IRS. These work the opposite way: you send money in advance so you don't owe a large amount when you file. The IRS website has a worksheet to calculate what you should pay.

Claim the standard deduction or itemize, whichever is larger

A deduction reduces the income the IRS taxes you on. Everyone gets at least the standard deduction, which varies by age and filing status. For 2024, the standard deduction is $14,600 for single filers, $29,200 for married filing jointly, and higher if you're 65 or older. You don't need receipts or proof to claim it—you just claim it on your return.

If your deductible expenses add up to more than the standard deduction, you can itemize instead. Itemized deductions include mortgage interest, property taxes (capped at $10,000 per year), charitable donations, and medical expenses above 7.5% of your income. You'll need receipts and records for these. Calculate both the standard deduction and your itemized total, then claim whichever is larger.

Many people leave money on the table by not itemizing when they should, or by forgetting deductible expenses. Keep a folder throughout the year for receipts from charitable donations, medical bills, and property tax statements.

Claim every tax credit you're may have access to to

A credit is more valuable than a deduction because it reduces your tax dollar-for-dollar instead of just reducing your taxable income. The most common credits are:

  • Child Tax Credit: Up to $2,000 per child under 17. You need the child's Social Security number and they must live with you for more than half the year.
  • Earned Income Tax Credit (EITC): For workers with low to moderate income. The amount depends on your income, filing status, and number of children. This credit can result in a refund even if you owe no tax.
  • Education Credits: The American Opportunity Credit (up to $2,500 per student) and Lifetime Learning Credit (up to $2,000) for may have access to education expenses. You cannot claim both for the same student in the same year.
  • Dependent Care Credit: Up to $3,000 in expenses for childcare or elder care if you paid for it so you could work.
  • Retirement Savings Credit: Up to $1,000 if you contributed to a traditional or Roth IRA or workplace retirement plan and your income is below certain limits.

The IRS does not tell you which credits you're may have access to to—you have to know about them and claim them. If you miss a credit, you don't get it back unless you file an amended return within three years.

Report all income, including side work and investments

The IRS receives copies of income reports from your employer (W-2), banks and brokers (1099 forms), and other payers. If you don't report income that they already know about, the IRS will catch it and send you a bill with penalties and interest. Unreported income is the most common reason for audits.

This includes freelance work, gig economy income, rental income, investment gains, and cash tips. If you earned more than $400 from self-employment, you owe self-employment tax in addition to income tax. You'll need to file Schedule C (for sole proprietors) or Schedule 1099-NEC (for independent contractors) to report this income and deduct business expenses.

Business expenses reduce your taxable income from self-employment. These can include supplies, equipment, home office space (calculated as a percentage of your rent or mortgage), vehicle mileage, and professional services. Keep receipts and a mileage log if you use your car for work.

Use tax software or a professional to catch what you missed

Tax software walks you through questions about your situation and flags deductions and credits you might be may have access to to. Programs like TurboTax, H&R Block, and TaxAct have free versions if your income is below certain thresholds (usually around $79,000). The IRS also maintains a list of free tax preparation sites through the Free File Alliance.

A tax professional—either a CPA or enrolled agent—can review your situation and find deductions you didn't know existed. This costs money upfront but often pays for itself if you have complex income, business expenses, or rental property. If you're self-employed or have investment income, professional help usually saves more than it costs.

Whichever route you choose, double-check the math before you file. The IRS will correct obvious errors, but they won't volunteer to give you deductions or credits you missed.

File on time and keep records for three years

The important date to file is April 15 (or the next business day if that falls on a weekend). If you can't file by then, request an extension using Form 4868. An extension gives you until October 15 to file, but it does not extend the important date to pay any tax you owe—you still owe interest and penalties on unpaid tax after April 15.

Keep copies of your filed return, all supporting documents (W-2s, 1099s, receipts, bank statements), and records of deductions for at least three years. The IRS can audit returns from the past three years without special reason, and up to six years if they suspect underreporting of income. If you claim a loss from a business or rental property, keep records even longer.

Frequently Asked Questions

Can I get a bigger refund by claiming dependents I don't have?

No. The IRS matches dependent claims to Social Security numbers and will reject false claims. Claiming dependents you're not may have access to to is tax fraud and results in criminal penalties, not just a larger refund.

What if I made a mistake on my return after I filed?

File an amended return using Form 1040-X within three years of the original filing date. If you owe more, you'll owe interest and possibly penalties. If you overpaid, you'll get a refund. The IRS processes amended returns slowly—expect four to six months.

Does filing electronically get me a bigger refund?

No. Electronic filing is faster and more accurate, but it doesn't change the amount of your refund. It does process your return quicker, so you get your refund sooner if you're may have access to to one.

Should I claim the standard deduction or itemize if they're about the same amount?

Claim whichever is larger, even by a small amount. If they're within a few hundred dollars, itemizing requires keeping receipts and records, so the standard deduction is usually simpler unless you have large deductible expenses like mortgage interest or charitable donations.

What happens if the IRS thinks I claimed too much?

The IRS will send you a notice asking for proof of the deduction or credit. Respond with your records within the important date on the notice. If you can't prove it, you'll owe the tax plus interest. If you disagree with their decision, you can appeal through the IRS appeals process or file in Tax Court.