Hey, glad it was useful. I found it to be really easy to use and covered just the right amount of typical income sources to make it useful to most folks' tax situation.I just tried it and found it quite helpful looking ahead at 2011. There are small bracket changes between 2010 and 2011, but not meaningful.
As far as accuracy, seems very likely that it would be accurate. If there is one thing computers do well it is add and subtract, and the relevant algorithm once you have categorized income is straightforward.
This beats loading up my TTax files with dummy tax scenarios, I thank you for posting it.
Ha
I used it to try to predict taxes for some what-ifs last year involving IRA conversion to Roth and it really helped determine my thresholds and I was able to keep in the bracket I wanted.