Tax Withholdings - confused
Hi all. Working my taxes and it looks like I'll owe nearly 11K Federal and I'm confused. For all of 2020 I was set up as a Single 0. I earn a salary, bonus and get some RSUs - taxes are withheld from all three forms of income. Small amounts of other income in interest and dividends, but not material. I have a few deductions like mortgage interest and charitable giving, but nothing crazy. What do I not understand about withholdings? At a Single 0, which reflects my actual status - single and no dependents, why am I not in closer balance with my obligations? Thanks for any insight.