Why is my refund smaller than last year?
A shrinking refund and a new balance due have the same causes. What moved, what an offset takes before the money reaches you, and how to read the difference.
Quick answers
- Why did my refund drop when my pay did not change?
- Look at the withheld line first. A new employer, a mid-year form change or a bonus withheld at the flat supplemental rate can lower what was paid in even when your gross pay looks the same as last year.
- Who do I call if my refund was taken for a debt?
- It depends on the debt. The Bureau of the Fiscal Service runs offsets for child support, state tax and federal non-tax debts and sends its own notice. A prior-year federal tax balance is applied by the IRS itself, so that one is an IRS question.
- Is a smaller refund a sign my return has a mistake?
- Usually not. A refund is the gap between what was paid in and what the return calculated, so it shrinks whenever either side moves. Check the withheld line and the credit lines before assuming an error.
A refund is the gap between what was paid in and what the return calculated, so it shrinks whenever either side moves. Sometimes the return is right and something took the money after the IRS approved it.
| Flat withholding rate on supplemental wages | 22% | Publication 15 (2025), section 7, Supplemental Wages |
|---|---|---|
| Child tax credit per qualifying child | $2,200 | 2025 Schedule 8812 line 5 |
| Credit for other dependents, per dependent | $500 | 2025 Schedule 8812 line 7 |
| Combined self-employment tax rate | 15.3% | 2025 Schedule SE lines 10–11 |
A refund is a difference, not an amount
The number at the bottom of the return is not a payment the government decides to make. It is a subtraction: everything paid in during the year, minus the tax the return figures. Move either side and the difference moves with it, which is why a refund can halve in a year when your salary did not change at all. Where your refund comes from works through the arithmetic.
That framing is worth holding on to, because it turns a vague sense that something went wrong into two specific questions. Was less paid in, or was more tax due?
Less was withheld
Start on the paid-in side, because it is where most of these questions end. A new employer restarts withholding from a fresh Form W-4 rather than carrying over the old one. A form filed mid-year to fix a shortfall in one direction can overshoot in the other. A raise moves you along the table but not always as far as you assume.
Bonuses deserve their own line. Where a bonus is paid separately from regular wages, an employer may withhold on it at the flat supplemental rate of 22%, so a year with a large bonus can pay in less than the return turns out to need. Why do I owe taxes this year explains why that flat rate and your own rate need not line up, and Form W-4 covers how to correct it.
A credit got smaller or ended
Credits come off the tax itself, so losing one moves a refund more than almost anything else. A child who passes the age limit takes the child tax credit at $2,200 with them and generally leaves the credit for other dependents at $500 in its place.
Income can end a credit without any change in your family at all, because most of them taper away above a threshold. The education credits, for instance, begin to phase out above $80,000 for single and head of household filers. The child tax credit and education credits cover the tests each one applies.
Income you did not have last year
New income adds tax without adding withholding, which pushes the difference down from both directions at once. A side gig or contract work brings self-employment tax at 15.3% on top of income tax, and nothing was taken out along the way.
The quieter versions do the same thing more slowly. Interest on savings, a retirement withdrawal taken without withholding, and unemployment benefits, where the voluntary withholding rate of 10% applies only if somebody asked for it, all arrive whole and all get taxed at the end.
Smaller refund versus bigger bill
A refund that falls from a comfortable figure to almost nothing, and a return that lands a few hundred dollars the wrong side of zero, are the same event. The arithmetic does not change when the difference crosses zero; only the direction of the transfer does.
It is worth naming that, because the second one feels far worse than the first and the causes are identical. Why do I owe taxes this year works the same list from the other side of the line.
The IRS changed your return
Sometimes the number moved because the IRS moved it. A correction to arithmetic or an adjusted credit produces a refund smaller than the one your return asked for, and a letter that explains the change follows.
Read that letter before doing anything else, because it names the line that changed and the window for disagreeing. You got a letter from the IRS covers how to read one, and What a CP2000 actually is covers the notice that proposes a change to reported income.
The refund was taken: offsets
Four kinds of debt can take a refund before it reaches you: child support you have fallen behind on, money owed to a federal agency for something other than tax, unpaid state income tax, and certain debts for state unemployment compensation. All four run through the Bureau of the Fiscal Service, which writes to you separately to say what the refund was, how much of it went, and which agency received the money. That office, rather than the IRS, is the one to ask about the debt itself. A prior-year federal tax balance works differently, because the IRS applies your overpayment to it directly rather than routing it through that program, so no Fiscal Service notice arrives for one. Refund delayed covers both.
What to check, in order
Put the two returns side by side and read four things across, in this order. Total income first, because a rise there explains most of what follows. Then federal income tax withheld, which is the single line that most often accounts for the whole difference. Then the credit lines, where a dependent or a phase-out shows up. Then any notice you have received about the year.
Whichever line moved the most is the answer, and the fix depends on which one it was. If it was withholding, a new Form W-4 filed early in the year is the lever, and Form W-4 sets out which part of it to change.