In 2012, I put $4000 tax money in a traditional IRA account and filed form 8606 for the 2012 tax year. That $4000 was the only contribution I have ever made in that IRA account. In 2017, I converted the entire balance ($4000+$1000 capital gains) of that traditional IRA into a Roth IRA. My question is, what is the basis of my nondeductible contribution? Is it $4000 or $5000, or the ending balance of the account on 12/31/2016? Thank you.
