I have read a million articles on the **concepts** of (1) converting tIRA to Roth, and (2) harvesting capital gains without paying LTCG tax.

What I am looking for is a **formula** to establish how much can be done in any given tax year. Something like:

$X - AGI = LTCG at 0%

or whatever the formula happens to be.

Same thing for tIRA conversions to Roth. How do I calculate the actual amounts so I can decide how to make the moves?

Also, do I have until the tax filing deadline to do any Roth conversions for 2017, or is there another deadline?

Thanks!