The refund you get depends on what you paid in, what you owe, and which deductions and credits you actually claim

Your refund is not something the IRS decides to give you. It is the difference between the taxes you paid throughout the year (through withholding or estimated payments) and the actual tax you owe based on your income and circumstances. To get the largest refund possible, you need to do two things: pay in more than you owe during the year, and claim every deduction and credit you are may have access to to. The first happens mostly through your W-4 form if you are an employee. The second requires you to know what deductions and credits exist and whether your situation qualifies for them.

A larger refund is not always better — it means you gave the government an interest-free loan all year. But if you tend to overpay anyway, knowing where the money comes from helps you understand whether you are missing something.

Key Takeaways

  • Your refund size is determined by how much tax you paid in during the year minus what you actually owe; increasing either side increases your refund.
  • Adjusting your W-4 withholding is the main way employees control how much they pay in, and changing it mid-year takes effect within weeks.
  • Tax credits reduce your tax bill dollar-for-dollar and are worth far more than deductions of the same amount.
  • Common credits you might be missing include the Earned Income Tax Credit, Child Tax Credit, education credits, and energy-efficiency credits on your home.
  • Deductions lower your taxable income but only save you money at your tax rate; a $1,000 deduction saves $120 if you are in the 12% bracket, not $1,000.

Adjusting your W-4 to pay more in during the year

If you are an employee, the amount withheld from your paycheck is controlled by the W-4 form you filed with your employer. The more allowances or adjustments you claim on that form, the less comes out. To increase your refund, you can reduce those allowances or add extra withholding — this tells your employer to take out more money each pay period.

You can change your W-4 at any time by submitting a new one to your payroll department. The change usually takes effect within one or two pay cycles. If you know you will owe money at tax time, or if you want a larger refund, you can file a new W-4 now and see the effect on your next few paychecks. The IRS W-4 form includes a worksheet to help you estimate whether you are withholding the right amount, though many people find it easier to use the IRS withholding calculator on irs.gov.

Be aware that increasing withholding reduces your take-home pay. If you are living paycheck to paycheck, a smaller refund might be better than smaller paychecks now.

Tax credits: the highest-value deductions

A tax credit reduces your tax bill by the exact amount of the credit. A tax deduction reduces your taxable income, which saves you money only at your tax rate. This makes credits far more valuable. A $2,000 credit saves you $2,000 in tax. A $2,000 deduction saves you $240 if you are in the 12% tax bracket, or $370 if you are in the 22% bracket.

The most common credits that people miss are:

  • Earned Income Tax Credit (EITC): For workers with low to moderate income, this credit can be worth $600 to $3,700 depending on your income and family size. You must claim it on your return; the IRS does not automatically give it to you.
  • Child Tax Credit: $2,000 per child under 17. Many people know about this one, but some miss it if they have a new child or if their income changed.
  • Child and Dependent Care Credit: If you paid for childcare or daycare so you could work, you may be able to claim 20% to 35% of those costs, up to $3,000 in expenses per year.
  • Education credits: The American Opportunity Credit (up to $2,500 per student) and the Lifetime Learning Credit (up to $2,000) both reduce tax if you or a dependent paid for college tuition or fees. You cannot claim both for the same person in the same year.
  • Energy-efficiency credits: If you installed solar panels, a heat pump, or certain other home improvements, you may be able to claim a credit for part of the cost.

Each credit has income limits and other rules. The IRS website lists all available credits, and tax software will ask you questions to determine which ones you may have access to for.

Deductions: standard versus itemized

When you file your return, you choose between taking the standard deduction or itemizing your deductions. The standard deduction is a flat amount that depends on your filing status and age. For 2024, it is $14,600 for a single filer, $29,200 for married filing jointly, and $21,900 for head of household. You get this deduction automatically; you do not have to list anything.

If your deductible expenses (mortgage interest, property taxes, charitable donations, medical expenses above a threshold, and a few others) add up to more than the standard deduction, you can itemize instead. This requires listing each deduction on Schedule A. Most people come out ahead with the standard deduction, but if you own a home with a large mortgage, live in a high-tax state, or made substantial charitable donations, itemizing might save you more.

You cannot claim both. Tax software will calculate both and show you which is larger.

Income sources you might not have reported

Your refund also depends on reporting all your income. If you have income the IRS does not already know about — freelance work, rental income, investment income, or cash payments — you need to report it. If you do not, the IRS may catch it later and you will owe back taxes plus penalties and interest. More importantly for refund purposes, if you have self-employment income, you may be able to deduct business expenses, which lowers your taxable income and can increase your refund.

If you earned less than the threshold for your filing status (around $14,600 for a single filer in 2024), you may not owe tax at all, but you should still file if you had taxes withheld or if you are may have access to to credits like the EITC. Filing gets you the refund of what was withheld.

Common deductions people forget to claim

Beyond the standard deduction, several deductions are straightforward to overlook. If you are self-employed, you can deduct half of your self-employment tax, home office expenses, and supplies. If you are an employee, you cannot deduct unreimbursed work expenses anymore (this changed in 2017), but you can deduct student loan interest (up to $2,500) and educator expenses if you are a teacher.

If you made charitable donations, kept records of them, and itemize, you can deduct them. If you paid for a dependent's care so you could work, that is deductible (though the credit mentioned above is usually better). If you had significant medical expenses, those are deductible but only the amount above 7.5% of your adjusted gross income.

Tax software will walk you through these, but if you are filing by hand or using a basic form, it is worth reviewing the instructions for your form to see what you might have missed.

When to file early versus waiting

Filing early does not change your refund amount, but it does get you the money sooner. The IRS typically processes refunds within 21 days of receiving your return if you file electronically and choose direct deposit. If you file by mail, it takes longer — usually six to eight weeks.

The only reason to wait is if you are still receiving documents. If you are self-employed or have investment income, you may not get all your forms (1099s) until late January or early February. Filing before you have all your documents means you will have to file an amended return later if something changes, which delays your refund further.

Frequently Asked Questions

Can I change my W-4 in the middle of the year to get a bigger refund?

Yes. File a new W-4 with your employer and request extra withholding or reduce your allowances. The change takes effect within one or two pay cycles. If you want a refund by tax time, you need to make the change early enough that the extra withholding adds up over the rest of the year.

Is a bigger refund always better?

No. A large refund means you overpaid taxes throughout the year and gave the government an interest-free loan. If you need that money now, a smaller refund (or owing a small amount) is better because you keep more of your paycheck. Adjust your W-4 to match what you actually owe.

What is the difference between a tax credit and a deduction?

A credit reduces your tax bill dollar-for-dollar. A deduction reduces your taxable income, so it saves you money only at your tax rate. A $1,000 credit saves $1,000. A $1,000 deduction in the 12% bracket saves $120. Credits are always more valuable.

Do I have to itemize to get a bigger refund?

Only if your deductible expenses exceed the standard deduction. Most people come out ahead with the standard deduction. Tax software calculates both and uses whichever is larger automatically.

What if I missed a credit on last year's return?

You can file an amended return using Form 1040-X for the past three years. This is worth doing if you missed a large credit like the EITC or education credits, since the refund can be substantial.