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To amend 2019 tax return, do I use 2020 1099-R showing 5871 distribution??I only have tax form 5498 for 2019. 
If I use 2020 1099R to amend 2019 tax return, do I still report it in 2020 Tax return??

I did not do any deductible T IRA. 
I  contributed non deductible 7 k to Roth IRA and recharacterized 14k( 7k + 7k earning) to T IRA, then converted to Roth IRA ( back door IRA). So taxable amount seems to be for earnings even though it has not occurred in T IRA?