I would say "There is a mistake in the bill", not "on the bill". paco
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
It should be "in the bill" since what you are referring to is found in the contents of the bill. You would only use "on the bill" is your referring to something on top of the bill. a couple of examples:
"Mr. Jones you can find the extra charges for your services in the bill."
"Mr. Jones I placed your pen on top the bill." (The location of the pen is on top of the paper bill.)