This calculator gives you an estimate of your federal tax burden under a variety of scenarios. The three default scenarios are: full expiration of all Bush-era and Obama tax cuts, the Republican plan to extend the Bush-era tax cuts (H.R. 8, the Job Protection and Recession Prevention Act of 2012), and President Obama's plan to partially extend these cuts for families making under $250,000 per year ($200,000 for single filers) as well as extending tax cuts in the 2009 stimulus bill. Amounts shown are for tax year 2013, but this can be changed for other scenarios you might want to add.
This tax calculator is by Nick Kasprak.
You can email me at [My Last Name]@taxfoundation.org.
(I've chosen not to write out my full email address here to prevent spam robots from finding it.)