What the IRS is saying is that you did not have enough tax withheld from your pay, so you should have paid estimated tax in addition to the withholding.
You can use the Tax Withholding Estimator on the IRS web site to figure out what you should each put on the W-4 forms that you give to your employers so that you have enough tax withheld, and don't have to pay estimated tax. But it's too late to do anything about 2024.
How did a "small inheritance" cause you to owe $11,000? As Bsch4477 said, an inheritance is normally not taxable, and you do not even enter it in your tax return. And a "small" amount of additional income of any kind would not result in $11,000 of additional tax. How much did you inherit? Did you just get a check or a direct deposit to your bank account for the inheritance, or was it a financial account of some kind that was transferred to your name? Did you get some kind of 1099-series form, such as 1099-R, or other tax form for the inheritance? If you did not get any tax form, how did you enter the inheritance in your tax return? What form and line number does the inheritance appear on in your tax return?
