@Mike9241 if it were "optional", the paying a penalty for not paying quarterly would not be logical.
It's mandatory that the taxpayer pay estimated taxes quarterly and there is a penalty for not doing so.
It's optional that that taxpayer pay estimated taxes quarterly and there is a penalty for not doing so.
The 2nd sentence is just not logical (and thus poorly written if we'd ask an English teacher). If there is an option then why a penalty? Not logical.
Which sentence makes more sense?
It's mandatory to stop at a stop sign and there is a penalty for not doing so.
It's optional to stop at a stop sign and there is a penalty for not doing so.
suggest looking up the definitions of "mandatory" and "optional" 🙂
