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When should I send in the 2016  form 8606 to minimize attention of the IRS and reducing the chance of getting audited.?

1) Should I send it in when I do my 2020 tax filing time at which I will also send in  together a 2020  form 8606 and a 2016 form 8606 ? 

2) my other question: can i do my back door roth conversion for my 2016 prior to sending my 2016 for 8606?

3) I plan to do a roth conversion for both my 2016 and 2020 traditional IRA together soon but I want to be sure that I can do this before sending my 2016  form 8606 and 2020 form 8606?

4) I still do not understand why Turbotax generated only my wife 2016 form 8606 and  why it failed to generate a 2016 form 8606 for me in 2016?

5) Can I do a roth conversion for my 2020 traditional IRA first and  then do another roth conversion for the 2016 traditional IRA later?

6) How do I ensure the 2020 turbo tax does not fail to generate 8606 in the future tax filing?

 

Thank you for your help