I have filed Form 8606 for tax years 2016, 2017, and 2018. Each of those years has been super simple, just stating in lines 1/3/14 the total that was non-deductible for that year and that year alone.
However, I think my mistake is that I should have had a running total.
My lines 1/3/4 were as follows for each year:
2016 $920
2017 $5500
2018 $5500
I *think* 2017 should have had $920 in line 2 (and lines 3 and 14 as $6420)
And 2018 should have had $6420 in line 2 (and lines 3 and 14 as $11920)
I have taken no distributions/withdrawals or done any conversions.
Do I need to refile Form 8606 for years 2017 and 2018 or can I just fix it when I do my filing for 2019?
Edit:
Some additional info...
I just did my 2019 taxes and while TurboTax did ask me about my previous year's nondeductible IRA contributions and made me give explanations for the discrepancy that it saw, because my IRA contribution this year was completely deductible, TurboTax did not generate a Form 8606. It only generated a "blank form" (yes, that's what it's titled) with the explanations of the discrepancy.
