Although the default Federal tax withholding rate on unemployment comp is 10%, the actual tax is calculated based on your marginal tax rate.
Had you already entered your other 2021 income; and then when you entered the U/E comp, your taxes went up a lot? Any time you add income, some of your deductions/credits can go down. Did you also collect Social Security? More of it may become taxable when you add any other types of income.
