You were supposed to be filing form 8606 every year to keep up with it. You will need to go back and recreate those records and send them to the IRS. You need to:
- print each year form 8606, IRS prior year 8606 forms and instructions
- fill it in with the correct numbers
- sign and date the bottom of the form
- mail each year separately. See Where to file paper tax returns with or without a payment
I personally helped someone go back over 30 years because the IRS required them to do it. The other option would be to say there is no basis, if you never filed an 8606.
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