The phrase "tagged on" typically means something added or appended to the end of an existing item or action. Some antonyms for "tagged on" could include "removed," "omitted," or "eliminated."
"Removed" suggests taking away something that was previously attached, while "omitted" indicates intentionally leaving out a component that might have otherwise been included. "Eliminated" involves getting rid of something entirely, rather than just adding or including it.
Other antonyms could include "reduced," "shrink," or "shortened," which all imply making something smaller or more concise rather than appending to it. "Altered" or "modified" might also work as antonyms, as they suggest changing the original item rather than adding to it.