Conor McGregor is in Los Angeles this week for the first press conference for his megafight with Floyd Mayweather.

Shortly after news surfaced that Mayweather is behind on his taxes, TMZ cameras caught up with the UFC star in Beverly Hills on Monday (July 10) and asked him about it… and took a few shots.

“That’s gotta sting,” McGregor said … “He shoulda paid his taxes and stayed retired and kept my name out of his mouth! He’s f*cked now.”

When asked if he would be smarter with his money, Conor first joked: “How does it look mate? I’m on Rodeo Drive! I’m blowing f*cking loads of it!”

“Nah, I don’t know. I’m gonna be smart.”

Whatever the case it, both McGregor and Mayweather stand to make over $100 million each come Aug. 26.