Thank you so much! We only had to pay for food while we had the layover, transportation from the SFO airport to the hotel and back and for breakfast one day when we had to eat on our own but theoretically we didn’t have to spend anything because they provided enough money for those, food on the other days, transportation whenever we went somewhere, activities and a lot of free stuff.
The money we(personally) spent was on another hotel in sacramento(because we extended the trip), renting a car, snacks, clothing, etc.
I’m not sure I understand your question about taxes. We didn’t have to pay taxes for the Google Pixel 3XL as it was a gift.