If you owe more than $1000 when you file your tax return, there may a penalty for not paying estimated payments during the year. If you live in a state that has income tax, they may have a penalty as well.
Turbo Tax will generate estimated payments if it seems like you will owe for the next year, but you are not obligated to make them. It is your choice. You can make estimated payments, you can change your withholding or you can just pay what you owe when you file.
Last year, so many people owed when they filed their tax returns, that the IRS waived the underpayment penalty for everyone. That has not been announced for this year yet, but it may happen again.
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