How much in total does Logic Pro X cost with taxes added on?

I depends on your state and what kind of law the have for online purchases.

Usually if you make purchases from an vendors out of your state, then state sales tax don't apply. That's why the same product on Amazon may have tax or not tax deepening on where the vendors is incorporated.

However, there is a line in your tax return where you have to report that non-taxed purchase and still pay tax (technically). I think it is called "Use Tax"

Hope that helps

Edgar Rothermich - LogicProGEM.com

(Author of the "Graphically Enhanced Manuals")

http://DingDingMusic.com/Manuals/

'I may receive some form of compensation, financial or otherwise, from my recommendation or link.'

It depends on your location.

Check here.