Do I need to amend my return if...

Hello,

 

So I filed my tax returns and have already received my tax return money earlier last month. 

 

A week or so after receiving my money, I received a 1099B form for selling stock at my company (which I could have sworn I did back in 2019, but evidently not). The total amount I received for selling my stock was a $700.

 

The two questions I have in regards to this are:

 

1) Should I go through the process of Amending my return in order to add the 1099B?

 

2) If I amend the return, would I have to pay the TurboTax Deluxe fee again to submit a new amended tax form?

 

Thanks for your time.