You can ask the employer to withhold taxes on the bonus.
Congrats on the bonus(!), but it most likely pushed you into a higher tax bracket, resulting in more tax.
Another option is to use a calculator, such as TurboTax's W-4 Calculator, TurboTax's Tax Caster tax calculator, or https://www.irs.gov/individuals/tax-withholding-estimator and pay estimated taxes when you receive the bonus (if they haven't withheld taxes). You can pay estimated tax payments easily at IRS Direct Pay. You may want to see this article to understand some of the changes for 2024: The IRS provides tax inflation adjustments for tax year 2024. That IRS page will show you the tax brackets for your filing status for 2024.
