/*********************************************************
   2001 Individual Income Tax Calculation
   usage:  federalTax = calcSingle( taxableincome );
   usage:  federalTax = calcMarried( taxableincome );
	 usage:  federalTax = calcFederalTax( taxableIncome, married );
	 Copyright 2001 Mark E. Gunnison
  *********************************************************/

function calcFederalTax( taxableIncome, married )
{
var fedTax = 0;


 			if (married == 1)
			 	fedTax = calcMarried( taxableIncome );
			else
				fedTax = calcSingle( taxableIncome );

			return (fedTax);
}	
	
	
function calcSingle( taxableIncomeR )
{
   var fedTax = 0;

     taxableIncomeR = roundIncome(taxableIncomeR);

     if (taxableIncomeR<27050)
          fedTax = taxableIncomeR*.15;

     if (taxableIncomeR>=27050 && taxableIncomeR<65550)
          fedTax = ((taxableIncomeR-27050)*.275)+4057.5;

     if (taxableIncomeR>=65550 && taxableIncomeR<136750)
          fedTax = ((taxableIncomeR-65550)*.305)+14645;

     if (taxableIncomeR>=136750 && taxableIncomeR<297350)
          fedTax = ((taxableIncomeR-136750)*.355)+36361;

     if (taxableIncomeR>=297350)
          fedTax = ((taxableIncomeR-297350)*.391)+93374;

     if (fedTax < 0)
          fedTax = 0;

     fedTax = Math.round(fedTax);
		 
		 return( fedTax );
}

function calcMarried( taxableIncomeR )
{

  var fedTax = 0;

     taxableIncomeR = roundIncome(taxableIncomeR);

     if (taxableIncomeR<45200)
          fedTax = taxableIncomeR*.15;

     if (taxableIncomeR>=45200 && taxableIncomeR<109250)
          fedTax = ((taxableIncomeR-45200)*.275)+6780;

     if (taxableIncomeR>=109250 && taxableIncomeR<166500)
          fedTax = ((taxableIncomeR-109250)*.305)+24393.75;

     if (taxableIncomeR>=166500 && taxableIncomeR<297350)
          fedTax = ((taxableIncomeR-166500)*.355)+41855;

     if (taxableIncomeR>=297350)
          fedTax = ((taxableIncomeR-297350)*.391)+88306.75;

     if (fedTax < 0)
          fedTax = 0;

     fedTax = Math.round(fedTax);
		 
		 
 		 return( fedTax );
}

/***************** Round to amount used by the IRS in their table ************************/
function roundIncome(taxableIncomeR)
{
var taxableIncome = 0;
taxableIncome = taxableIncomeR;


        if (taxableIncome<3000 && taxableIncome>0)       //use IRS rounding for table
	{

                taxableIncomeR = Math.floor(taxableIncome/100);  // round to 100
                taxableIncomeR = taxableIncomeR*100;

                if (taxableIncome - taxableIncomeR < 25)
                        taxableIncomeR += 13;
                if (taxableIncome - taxableIncomeR >= 25 && taxableIncome - taxableIncomeR < 50)
                        taxableIncomeR += 38;
                if (taxableIncome - taxableIncomeR >= 50 && taxableIncome - taxableIncomeR < 75)
                        taxableIncomeR += 63;
                if (taxableIncome - taxableIncomeR >= 75 && taxableIncome - taxableIncomeR < 100)
                        taxableIncomeR += 88;

	}


        if (taxableIncome<100000 && taxableIncome>=3000)       //use IRS rounding for table
	{

                taxableIncomeR = Math.floor(taxableIncome/100);  // round to 100
                taxableIncomeR = taxableIncomeR*100;

                if (taxableIncome - taxableIncomeR < 50)
			taxableIncomeR += 25;
		else	
			taxableIncomeR += 75;
	}

	return( taxableIncomeR );
	
}