BetrCalc (version 0.90) is a tool for estimating the impact of tax bracket changes across different income groups. BetrCalc is python-based, using numpy, scipy, and the magic of calculus, to compare competing tax rate/bracket scenarios side-by-side using detailed visualizations and metrics.
Select calculation mode 3 using the radio button. Set the Total Tax to 111000000. In Plan B, select one bracket using the radio button. Set the tax rate to 0.0 for auto calculation. Set the tax credit limit to 1000 and the tax credit amount to 500. Press the update button. The result will be a revenue neutral single tax with low income tax relief.