its a lot more complicated because there are stages at which LTCG gets taxed a 0% and tax rates are incremental some income gets taxed at lower rates additional income gets taxed at higher rates. .   an estimate would be that $15,000 of LTCG would be taxed at 0%,  the other $105,000 at 15%.    your taxable distribution is reduced by the standard deduction so you are taxed on only $24,000. about $9500 gets taxed at 10% with the balance taxed at 12% (it's like capital gains are ignored when computing taxes on ordinary income)    

I kind of know LTG is @ 15 but I am trying to find out if my conversion , say $ 35k is at 12 % or at the higher bracket . It helps me know whether to do a conversion or not if I take a LTG if $100k the same year or just do the Roth conversion a different year . Thanks again