Originally Posted by 43210
The best alternative is really to understand the math directly. Then the tax software or spreadsheets, graphs, info on web, etc, can reinforce that.
Originally Posted by Scuba
Agreed. What do you think is the easiest way to gain this understanding? I donít understand it now, would have no chance of modeling our situation accurately.
One key math concept to understand is "Piecewise Functions". You can google it, but here are a few links.
Piecewise Functions | Coolmath.com
Then understand that things like
can be viewed as piecewise functions.
Also marginal rates are like derivatives (from calculus), except there is often some rounding.
Also there are really more than one variable (e.g. different forms of income taxed differently) so you actually have partial derivatives of multivariable functions.