You are confusing tax rate and withholding rate.
Bonuses are considered wages and are taxed the same way as other wages on your tax return. However, the IRS doesn’t consider them regular wages. Instead, your bonus counts as supplemental wages and can be subject to different federal withholding rules than your regular wages when your get paid your bonus.
Enter your W2 as it is and you will be fine.
For further information refer to the link Vanessa A referred you to here: How Bonuses Are Taxed
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