Turbo tax asks a question called "Actual Withholding" to figure out the underpayment penalty. It is not clear to me what they are asking.

[gecoker]

The whole question goes like this;
IRS treats your total federal income tax withholding (from wages, interest, dividends, etc.) as being paid in four equal quarterly installments. For the purpose of figuring the underpayment penalty, you may elect to treat the tax withheld as paid when it was actually withheld. Would you like to do this?

I am not sure if I should say YES or NO. What is the difference saying YES or NO?
In 2020, I was self-employed for 2 months and I didn't pay the estimated tax for that pay, so I think there's a penalty and I would like to make sure I pay the penalty.

[Bsch4477]

If you say “yes” you have to calculate how much income from all sources you earned in each quarter. If, for example, the bulk of your income was in the last quarter of the year you would have to pay less of a penalty than if the bulk was in the start of the year.