(I already answered in the Todd Paul's forum request thread, but it would be more in its right place here: )
Yes French citizens in Monaco must pay taxes in France i think, but those that became Monegasque (nationality) lose french nationality, so i think (but i am really unsure) they only depend of Monaco rules.
I'm a little shocked you obviously didn't read his post-match interview in Monte-Carlo, Renaud.
Q. Les gens pensent souvent que vous êtes Français?
R. C'est toujours la même question qui revient. Quelques fois même ils me reprochent de jouer pour Monaco. Je leur rappelle que je paye mes impôts en France. Ils pensent ce qu'ils veulent, cela m'est égal.
People sometimes criticize him for playing for Monte-Carlo now and he reminds them then that he still pays taxes in France
. They can think what they want, he doesn't care.