Who was the first president to have a salary raise?

Answer 1

Increases in the presidential salary were made when a new President took office, so the president did not actually get a raise, he just got more than his predecessor.

I do not think any president actually got a raise while his was in office.

Answer 2

The first time the U.S. presidential salary went up was at the beginning of Ulysses S. Grant's second term (from $25,000/year to $50,000/year).