Is this French sentence correct: "Dans cet article, il s’agit des nouvelles taxes établies" if I wanted to say "This article is about the new established taxes.

Answer 1

Usually in front of a plural adjective, "des" becomes "de."

Sra (aka Mme)

Answer 2

Yes it is correct:
Here's the difference :

"Dans cet article, il s’agit des nouvelles taxes établies" = "This article is about the new established taxes.

"Dans cet article, il s’agit de nouvelles taxes établies" = "This article is about new established taxes.