`backdoor conversion prorata rule for 2020 tax filing

Hello all,

 

I would kindly like the advice.

 

as of now, 1/5/2021

I have traditional IRA amount of 60000 (pretax dollars), this amount was rolled over from previous 401K, this was rolled over in 2018, then there is no additional contribution since. 

 

Now I have 401k active with current company. 

 

I am planning to do backdoor roth conversion for year 2020

 

If I roll 60,000 to 401k now (1/5/2021), and then adding post tax dollar to nondeductable IRA then convert this amount of 6000 to roth.  The deadline for IRA contribution is 4/2021 for year of 2020. 

 

Will this 6000 be taxed by prorata rule when it is converted to ROTH from nondeductable IRA. 

 

Welcome any advice, and thought, I really appreciate it. 

 

Regards, 

PD