You misunderstand how tax withholding works. When you sign up for tax withholding, the IRS gets a portion of your wage each paycheck and sets it aside for you to cover your tax bill the following year. The IRS is only holding that money for you during that time before your annual bill is due, in what amounts to you loaning the government money interest-free. Many people do not withhold taxes and just pay it all at once. And yes, at this point, whether the IRS will exist as a functioning entity in 2026 is a legitimate question, so not giving them a free loan might be a good idea