No, you do not need to file the amendment if you reported the 2018 1099-R on your 2018 tax return.   When you enter the 2019 1099-R on this tax return, it should not show as taxable (the codes in Box 7 will ensure this).   You will get a message that says ''you may need to amend your tax return'' but you can ignore it as you were proactive and reported the transaction on the correct tax return (20018).  

What are the codes in Box 7? 

2019 - 1099R from the Brokerage house - is P return of 2018 contribution

The one I created also has P - It also has a x in the box for it being for 1099R for 2019

Thanks - 

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@MT2019 wrote:

2019 - 1099R from the Brokerage house - is P return of 2018 contribution

The one I created also has P - It also has a x in the box for it being for 1099R for 2019

 

Thanks - 

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If the same as what you already reported on you 2018 tax return then just ignore it.   Not having to amend 2018 when you received the 2019 1099-R with the code P was the reason for created a dummy 1099-R in 2018 in the first place.