Backdoor roth conversion from a previous year traditional IRA limit

[zumbar12]

I made a non-deductible IRA contribution($5500) in February 2019 ,against 2018 traditional IRA limits. 

I made another non-deductible IRA contribution($6000) in November 2019 , against 2019 traditional IRA limit.

I converted the entire sum(11500) into a ROTH IRA via backdoor. 

I got a 1099-R which shows an amount of 11500 , and gain is 0$. 

However I get an error on turbo tax as below

Taxable Amount should not bbe zero if there is no prior year excess traditional IRA contribution on line 10b,2018 column , of the federal Carryover Worksheet.

Can someone help on how I should proceed. 

TT is not allowing me to e-FILe. 

[macuser_22]

What code is in box 7 on your 1099-R?

Is the IRA/SEP/SIMPLE box checked?

[zumbar12]

Yes the box is checked.

[macuser_22]

Exactly where and when do you see that error message?    It would appear to have nothing to do with the 1099-R.

Line 10b on the carryover work sheet is "Spouses excess Coverdell ESA contributions" for 2018 or 2019.

[zumbar12]

Since I contributed 5500$ in FEb 2019 (against 2018 limits), i did not get a 1099-R for Tax year 2019. 

I have just one 1099-R that i have generated this year (for tax year 2020).

Do I need to amend my 2018 return to account for the 5500$ contribution against 2018 limits? 

[macuser_22]

If you did not report the 2018 contribution then you either must amend 2018 and add it as a non-deductible contribution  with a 8606 for showing the contribution on line 1,3 & 14 or file a stand-alone 8606.

When reporting the 2019 conversion you would use that 8606 line 14 amount and enter it as below.

Enter a 1099-R here:

Federal Taxes,
Wages & Income
(I'll choose what I work on - if that screen comes up)
Retirement Plans & Social Security,
IRA, 401(k), Pension Plan Withdrawals (1099-R).

OR Use the "Tools" menu (if online version left side) and then "Search Topics" for "1099-R" which will take you to the same place.

Be sure to choose which spouse the 1099-R is for if this is a joint tax return.
Be sure to pick the correct 1099-R type: Standard 1099-R, CSA-1099-R, CSF-1099-R, RRB-1099-R.

[NOTE: When you get to the "Your 1099-R Entries" screen where you can add another 1099-R, use "continue" to keep going as there are additional interview questions after that screen in most cases. You can always return as shown above.]

You will be asked of you had and tracked non-deductible contributions - say yes. The enter the amount from the last filed 8606 form line 14 if it did not transfer. Then enter the total value of any Traditional, SEP and SIMPLE IRA accounts that existed on December 31, 2019.

That will produce a new 8606 form with the taxable amount calculated on lines 6-15 and the remaining carry-forward basis on line 14.

NOTE: If there is an * next to line 15 then 6-15 will be blank and the calculations will be on the "Taxable IRA Distributions worksheet instead.