This calculator is based on the bill negotiated by the conference committee that is working to reconcile the House and Senate versions of the plan. We are modeling only the personal tax provisions of that bill.
It uses data from an Internal Revenue Service file of more than 150,000 tax records, which were derived from real 2012 tax filings, in addition to data on households that did not file a tax return. (The filings are jumbled to prevent revealing personal information on any individual taxpayer.) We analyzed the effects of the bill using Tax-Calculator, an open-source tax-modeling program. Special thanks to Matt Jensen and Anderson Frailey of the Open Source Policy Center at the American Enterprise Institute, a right-leaning think tank, for their help with the program.
The I.R.S. data does not include geographic information. We assigned households to states based on how much they paid in state and local taxes.
All income figures in this graphic refer to adjusted gross income. This is a relatively broad measure, but it leaves out some sources of income that can affect tax calculations, such as pre-tax retirement plan contributions. As a result, there are a few cases in which families with low adjusted gross incomes have very large tax changes under the bill.
Special thanks to Daniel Feenberg of the National Bureau of Economic Research for state tax modeling help.
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