Where can I find the actual tax "math" for Paul Ryan's budget?

Serious question here—I can’t seem to find it anywhere (not being sarcastic). I tried googling it and finding a politically neutral article and I am having one hell of a time. All I find in google results are either Colbert clips or Fox News interview where he didn’t answer the question fully asked by Chris Wallace.

For those who respond, please reference (politically neutral) links, or at the very least, references that aren’t completely biased to the LEFT or the RIGHT.

Thanks!