Really nice reading ! Not ashamed to admit I didn't understand everything and didn't reach the end (to my defense: not living in the US, not a us citizen). But

Really nice reading ! Not ashamed to admit I didn't understand everything and didn't reach the end (to my defense: not living in the US, not a us citizen). But considering taxes can change from year to year, all this work and research has to be redone every few years, right ?