TL;DR: How do you know how much stock to sell in a taxable account to create an exact amount of taxable income?
For tax purposes, at least at my current understanding, my retirement plan is to have an income of say $16,000. This would put me at receiving near max subsidy for obamacare in addition to paying $0 in federal taxes. If my taxable vanguard mutual funds are throwing off $10k in dividends per year, I would still have to "earn" an additional $6k to meet the $16k goal. I could do a roth IRA conversion and create $6k of income. Or my second option is to sell my company stock that I have from the ESPP I've been participating in that gets me stock at a 15% discount, but this stock has been purchased at various prices throughout the years. So my question is, how do I know how much stock to sell to generate a taxable event of $6k?
Hopefully my understanding of this isn't totally off...