Naww, it's not that easy. If I recall, there is language of "paying 13 days after the first semi-quarter" blah blah. I was in business 14 years and never did fully understand it. So, I just paid it by the 7th day after the month I did the trip. Was usually paying it early, but never got into trouble.
And be careful, if you bill catering as a line item, you need to include that in the 7 1/2 percent. I didn't and got bit.
Learguy