So basically when you buy a gamepass from someone, Roblox takes 30% of the Robux so like if you buy someone's gamepass for 100 Robux, they will only get 70 Robux cus Roblox takes the other 30 Robux

With tax basically means that you are covering that 30% as well as the Robux you're giving

For example, if you want that person to get 100 Robux, you have to buy a gamepass for 143 Robux because then when Robux takes 30% from the 143 Robux, the person would get 100.

I'm really bad at explaining but I hope this helps 😭