The most common reason: you changed jobs, got a raise, or had less withheld

Your refund shrinks when less money was taken from your paychecks during the year. This happens most often when you start a new job (the new employer's withholding might be different), get a raise or bonus, pick up a second job, or claim a different number of dependents on your W-4 form. The IRS doesn't know about these changes automatically — your employer only withholds based on what you told them on your most recent W-4.

If you received a large refund last year and changed nothing, you likely had too much withheld then. The IRS doesn't adjust your withholding year to year; it only takes what your employer sends based on your W-4. A smaller refund this year might actually mean your withholding is now more accurate.

You can see exactly what was withheld by looking at your pay stubs throughout the year or by checking your W-2 form when it arrives. The "Federal income tax withheld" box on your W-2 is the total amount your employer sent to the IRS on your behalf.

Key Takeaways

  • Your refund depends on how much your employer withheld from your paychecks, not on how much you earned.
  • Changes to your job, income, or W-4 form directly affect your withholding and your refund size.
  • Tax credits you received last year may no longer be available this year if your income or family situation changed.
  • You can adjust your withholding mid-year by filing a new W-4 with your employer to get a larger or smaller refund next year.
  • The IRS refund amount is calculated by subtracting what you owe in taxes from what was already withheld.

Tax credits you claimed last year may not be available this year

Refundable tax credits — money the government sends you as a refund even if you owe no tax — can change year to year. The Earned Income Tax Credit (EITC) and the Child Tax Credit are the two largest, and both depend on your income and family situation. If your income went up, you might lose part or all of the EITC. If a child aged out or you no longer have custody, the Child Tax Credit shrinks.

The Child Tax Credit is $2,000 per may have access to child under 17, but the amount phases out as your income rises. The EITC phases out at different income levels depending on whether you have children and your filing status. If you crossed an income threshold this year, your credit amount dropped, which directly reduces your refund.

Other credits that affect your refund include the American Opportunity Credit (for education expenses) and the Saver's Credit (for retirement contributions). These are only available if you meet specific requirements each year. Check whether your situation changed in a way that would affect these credits.

You claimed dependents you can no longer claim

A dependent must live with you for more than half the year, be a U.S. citizen, national, or resident alien, and meet income limits. If a child turned 18 and moved out, you no longer claim them. If you shared custody and the other parent claimed the child this year, you cannot. If a dependent's income exceeded the limit (usually around $4,700 per year, though this changes annually), they no longer count.

Each dependent you claim reduces your taxable income and can increase your refund. Losing even one dependent can noticeably shrink your refund. The IRS matches dependent Social Security numbers to tax returns, so claiming someone you are not may have access to to claim will delay your refund and may trigger a notice.

Deductions you took last year are no longer available

If you itemized deductions last year, you may have switched to the standard deduction this year — or vice versa. The standard deduction changes every year and varies by age and filing status. For 2024, the standard deduction is $14,600 for single filers and $29,200 for married filing jointly (these amounts are higher if you are 65 or older).

Itemized deductions include mortgage interest, property taxes, charitable donations, and medical expenses above a certain threshold. If you had large deductions last year but not this year, your taxable income is higher, which shrinks your refund. Conversely, if you switched from itemizing to taking the standard deduction, you may have lost deductions that were reducing your tax bill.

Student loan interest deduction (up to $2,500 per year) and educator expenses (up to $300) are also common deductions that vary year to year based on your situation.

You had income the IRS did not withhold tax from

Certain income sources do not have tax withheld automatically. Freelance work, gig economy jobs, rental income, and investment income often arrive without federal withholding. If you earned money from these sources and did not make estimated tax payments throughout the year, you owe more tax than was withheld from your regular paychecks. This reduces your refund or turns it into a balance owed.

Self-employment income is particularly common here. If you drove for a rideshare company or sold items online alongside your regular job, that income was not withheld on. The IRS expects you to pay estimated taxes quarterly if you will owe more than $1,000 at tax time. If you did not, your refund shrinks because more of your total income is now subject to tax.

Interest, dividends, and capital gains also typically have no withholding. If you sold investments or received significant interest or dividends, check your 1099 forms to see whether any tax was withheld.

Your filing status changed

If you were married last year and divorced or separated this year, your filing status changes, which changes your tax brackets and standard deduction. Single filers have a lower standard deduction and higher tax rates than married filing jointly. If you went from married filing jointly to single, your refund will likely shrink because more of your income is taxed at higher rates.

Similarly, if you went from single to married filing jointly, your refund might increase because your combined income is taxed at lower rates and you get a higher standard deduction. Head of household status (available if you support a dependent and pay more than half the household expenses) falls between single and married filing jointly.

The IRS withheld less because of changes to tax law

Tax laws change periodically, and withholding tables are adjusted to reflect them. If the IRS updated withholding tables during the year, your employer may have withheld less from each paycheck. This is intentional — the IRS tries to keep your withholding close to what you actually owe so you do not get a large refund or owe a large amount at tax time.

However, these adjustments are based on averages and do not account for your specific situation. If the new withholding tables assumed you would have fewer deductions or credits than you actually do, you end up with a smaller refund.

Frequently Asked Questions

Can I get a bigger refund next year if I want one?

Yes. File a new W-4 form with your employer and claim fewer allowances or check the box to have extra money withheld. The more you have withheld, the larger your refund will be — though this means less money in your paycheck each week. You can adjust this at any time during the year.

What if my refund went down but I did not change anything?

Tax laws and withholding tables change annually. Your employer may have withheld less based on updated IRS tables. Also check whether any tax credits you received last year have income or may be able to access limits that might have changed. Review your current year's 1099 forms and W-2 to see if any new income appeared.

Does a smaller refund mean I did something wrong?

Not necessarily. A smaller refund often means your withholding is more accurate — you are not overpaying the IRS throughout the year. A large refund means you lent the government money interest-free. Smaller refunds are actually more efficient, though many people prefer larger refunds as a form of forced savings.

Should I claim zero allowances on my W-4 to get a bigger refund?

You can, but it means less money in each paycheck. Claiming zero allowances maximizes withholding and typically produces a larger refund, but you lose access to that money for months. Adjust your W-4 based on what works for your budget, not just to chase a refund.

What if I owe money instead of getting a refund?

This means less was withheld than you actually owe in taxes. Common reasons include unreported self-employment income, a second job, or losing tax credits. You can pay the amount owed when you file, set up a payment plan with the IRS, or adjust your W-4 immediately to withhold more for the rest of the year.