Should I file an amended return via turbotax to include Form 2210 that I failed to include in my initial filing?

[Randy55]

I use the annualization method to demonstrate timely estimated payments.  Somehow the turbotax system did not prompt me (or I missed the prompt) re: Form 2210. I failed to realize it was not included with my initial filing until receiving a penalty notice a couple of months after filing.  I'm guessing an amended return is the way to go but I don't want to head down the wrong path!

[Critter-3]

You really cannot amend for a penalty reduction ... call the number on the notice and see if they will accept a form 2210 in response to the notice. 

[Randy55 · Accepted solution]

Thanks for the lead.  I spoke with the Service and the advisor confirmed I should file an amended return, including Form 2210.  He emphasized including a brief explanation in Part III to highlight the reason for amendment (i.e. amending to include Form 2210 that was inadvertently omitted.