Here are some reasons why you might owe more this year after you already checked that you entered your withholding and that form W-4 is correct:
- You didn't qualify for the Earned Income credit.
- Received income from sources other than jobs that is not subject to withholding. For income from sources other than jobs, you can pay estimated tax instead or having extra withholding(W-4 step 4c).
Mortgage interest might affect your tax return if the total of your mortgage interest plus other itemized deductions is more that your standard deduction.
irs.gov
Consider using the estimator Tax Withholding Estimator
I also recommend that you do a line by line comparison with last year's return to see wat have changed.
[Edited, 02/20/2025|09:10 AM, PST]
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