How to calculate holiday net pay?

So I worked this past July 4th and I will be getting paid double for working on a holiday.

I’m just trying to budget and calculate how much I should be expecting, but wil ltaxes be taken out of my paycheck twice or just once?

For example, my gross pay is $1,400 bi-weekly

With taxes taken out, it’s only $1142.

So will it be $1142 x 2? Or $1440 x $1142?

Sorry I just keep forgetting how to calculate this! 🤣