Distributions from the 401k are taxed depending on your tax bracket and it might have pushed you into the next tax bracket. If you are in a higher tax bracket then the withholdings wouldn't be enough to cover the tax due on the distribution.
Please keep in mind we cannot see any details of your return. You might want to verify that all the entries on Form 1099-R are correct and that you have entered the federal and state tax withheld (box 4 and box 14):
- Click on "Search" on the top right and type “1099-R”
- Click on “Jump to 1099-R”
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