A "backdoor Roth" *is* non-deductible Traditional IRA contributions then converted to a Roth IRA.
There is no such thing as "backdoor Roth contributions".
Are you saying that you made non-deductible Traditional IRA contribution and never filed the required 8606 form each year to report the non-deductible contribution?
If that is the case, then you must file a 8606 for each year that such a non-deductible contrition was made. There is a $50 penalty for each missed 8606 that the IRS might waive if you request a waiver.
Note: that backdoor Roth only work when no Traditional IRA account exists prior to the non-deductible contribution and then the that is immediately converted to a Roth before there are any earnings and no Traditional IRA account at all exists at the end if the year - otherwise the non-deductible basis must be prorated over the conversion and remaining IRA value so only a portion of the conversion will be tax free. What you are describing is not a backdoor Roth.
You can get past year 8606 forms here:
<a rel="nofollow" target="_blank" href="
https://apps.irs.gov/app/picklist/list/priorFormPublication.html;jsessionid=xyqs7s9wI5xmbuD5SQj3XSF6...>
You would start with the first year and enter the non-deductible contribution on line 1 with any previous years contribution on line 2. Add 1 & 2 on line 3 and 14. Line 14 will carry to line 2 on the next years 8606 form. That would be repeated for each year that a non-deductible contribution was made.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
