I need to change the basis on Form 8606 line 2 from 2014. This error was carried through to 2015, 2016, and 2017. I was planning on submitting to the IRS just the amended form 8606 for years 2014 through 2017. A previous question was answered that the IRS mailing address to send this form to is the 1040/1040X address. However, the 1040 has its own IRS address, and the 1040X has a different one. Which to send it to?
