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 a larger refund, you need to either pay more in taxes than required, or reduce the amount of tax you owe. Most people focus on the second option — finding deductions and credits they missed — because paying more than you have to makes no financial sense.

The IRS does not decide your refund size based on need or circumstances. It is purely mathematical: taxes withheld or paid minus taxes owed equals your refund. This means a larger refund comes from one of three places: adjusting what your employer withholds, claiming deductions you did not claim before, or claiming tax credits you did not know existed.

Key Takeaways

  • Your refund grows when you claim deductions (which reduce your taxable income) or tax credits (which reduce your tax bill directly), so the second step is finding ones you missed.
  • Common missed deductions include student loan interest, educator expenses, and unreimbursed work costs, each with specific dollar limits and rules.
  • Tax credits like the Earned Income Tax Credit and Child Tax Credit are worth far more than deductions because they reduce your actual tax bill, not just your income.
  • If you get a small refund or owe money every year, changing your W-4 form at work will increase your refund next year by reducing what your employer withholds.
  • The IRS Form 1040 instructions and the IRS.gov website list every deduction and credit; a tax software program will prompt you for the most common ones.

Deductions you may have overlooked

A deduction reduces the amount of your income that gets taxed. If you earn $50,000 and claim $5,000 in deductions, you only pay tax on $45,000. Deductions are worth less than credits because they only reduce your taxable income, not your actual tax bill — but they still matter, especially if you have several small ones.

The most commonly missed deductions are student loan interest (up to $2,500 per year if you paid it), educator expenses (up to $300 per year if you are a teacher or school staff member), and unreimbursed work expenses. Unreimbursed work expenses are trickier: they must exceed 2% of your adjusted gross income before you can deduct them, and you can only claim them if you itemize deductions rather than taking the standard deduction. For most people, the standard deduction is larger, so this deduction rarely helps.

If you are self-employed or have side income, you can deduct business expenses — supplies, equipment, a portion of your home office, mileage, and meals related to the work. Keep receipts and records. If you paid for professional services like tax preparation or financial information, part of that cost may be deductible as well, though again only if you itemize.

Tax credits that reduce your bill directly

A tax credit is worth more than a deduction because it reduces your actual tax bill dollar-for-dollar, not just your taxable income. If you owe $3,000 in taxes and claim a $500 credit, you now owe $2,500. The same $500 deduction would only save you roughly $100 to $150 in taxes, depending on your tax bracket.

The Earned Income Tax Credit (EITC) is the largest credit for working people with lower incomes. The amount depends on your income, filing status, and whether you have children. You do not have to have children to claim it, but the credit is larger if you do. The IRS has a tool on its website to see if you may be may have access to to it.

The Child Tax Credit gives you up to $2,000 per child under age 17. The Child and Dependent Care Credit covers some of the cost of childcare or adult dependent care if you paid for it so you could work. The American Opportunity Tax Credit and Lifetime Learning Credit both help with education costs — tuition, fees, and course materials — though you cannot claim both for the same student in the same year.

If you made energy-efficient improvements to your home — installing insulation, a heat pump, solar panels, or a heat pump water heater — you may be may have access to to the Residential Energy Credits. These have specific rules about what qualifies and what documentation you need, so check the IRS website or ask a tax preparer.

Adjusting your withholding for next year

If you get a large refund every year, it means your employer is withholding too much tax from your paycheck. You are essentially giving the government an interest-free loan. To fix this and increase your take-home pay throughout the year, you need to adjust your W-4 form — the form you fill out when you start a job that tells your employer how much tax to withhold.

The IRS has a withholding calculator on its website that walks you through questions about your income, deductions, and credits, then tells you what to enter on your W-4. You can change your W-4 at any time by submitting a new one to your employer's payroll department. The change usually takes effect within one or two pay periods.

Adjusting your withholding does not change your refund for this year — it changes what you receive next year. If you want a larger refund this year, you need to find deductions and credits you missed on your current return.

The difference between itemizing and the standard deduction

You have two choices when you file: take the standard deduction or itemize. The standard deduction 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, though these amounts change yearly. You do not have to list anything; you just claim the standard deduction and move on.

Itemizing means you add up all your deductible expenses — mortgage interest, property taxes, charitable donations, medical expenses above a certain threshold, and others — and deduct that total instead. You should itemize only if your itemized deductions add up to more than the standard deduction. Most people benefit from the standard deduction because it is simpler and larger.

Tax software will calculate both options and show you which one saves you more money. If you are close to the itemizing threshold, it is worth spending time gathering receipts and records for charitable donations and medical expenses to see if itemizing gets you a larger deduction.

Using tax software or a tax preparer

Tax software like TurboTax, H&R Block, and TaxAct walks you through questions about your income, deductions, and credits, then calculates your refund. The software prompts you for the most common deductions and credits, so you are less likely to miss them. Many software programs are free if your income is below a certain threshold — check the IRS Free File program on IRS.gov to see which ones may have access to.

A tax preparer or CPA can review your situation and find deductions and credits you might miss on your own. This costs money, but if you have self-employment income, rental income, investments, or a complicated family situation, the preparer often finds enough deductions to pay for their fee and increase your refund.

Whether you use software or a preparer, the key is being thorough: gather all your documents before you start, including W-2 forms from your employer, 1099 forms for other income, receipts for deductible expenses, and records of any tax payments you made during the year.

Frequently Asked Questions

Can I claim deductions if I take the standard deduction?

No. You choose one or the other. If you take the standard deduction, you cannot also claim itemized deductions. However, a few deductions — like student loan interest and educator expenses — can be claimed even if you take the standard deduction. Your tax software will show you which ones.

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

You can file an amended return using Form 1040-X. You have three years from the original due date to claim a refund you missed. If you are owed money, filing an amended return will get it to you. If you owe additional tax, you should file it as soon as you realize the mistake.

Does claiming more deductions increase my chances of an audit?

Claiming deductions you are may have access to to does not increase audit risk. The IRS audits based on income level, type of income, and unusual patterns — not because you claimed a legitimate deduction. Keep receipts and records to support what you claim, and you have nothing to worry about.

Is there a limit to how much I can deduct?

Yes, most deductions have limits. Student loan interest caps at $2,500 per year. Educator expenses cap at $300. Charitable donations cannot exceed a percentage of your adjusted gross income. Your tax software or a preparer will explore these limits automatically.

What if I am self-employed — how do I get a larger refund?

Self-employed people can deduct all ordinary business expenses: supplies, equipment, a portion of home office rent or mortgage, vehicle mileage, meals, and professional services. Keep detailed records and receipts. You can also deduct half of your self-employment tax. A tax preparer familiar with self-employment can often find deductions you missed.