Calculate Israel's fast with C#

FastIsraelTaxCalculator.cs

using System;

namespace FastIsraelTaxCalculator
{
	class MainClass
	{
		static readonly string[] DefaultAmounts = new[] { "5000", "5800", "9000", "15000", "50000" };
		
		public static void Main (string[] args)
		{
			if (args.Length == 0) args = DefaultAmounts; 
			foreach (var amt in args)
			{
				int salary = int.Parse(amt);
				Console.WriteLine("Tax Rate for {0} is {1}", salary, CalcTaxFast(salary));			
			}
		}
		
		public static decimal CalcTaxFast(int salary)
		{			
			const int band1 = 5070;
			const decimal rate1 = 0.10m;
			const int band2 = 8660;
			const decimal rate2 = 0.14m;
			const int band3 = 14070;
			const decimal rate3 = 0.23m;
			const int band4 = 21240;
			const decimal rate4 = 0.30m;
			const int band5 = 40230;
			const decimal rate5 = 0.33m;
			
			const decimal rate6 = 0.45m;
			
			const decimal bandTax1 = band1 * rate1;
			const decimal bandTax2 = (band2 - band1) * rate2 + bandTax1;
			const decimal bandTax3 = (band3 - band2) * rate3 + bandTax2;
			const decimal bandTax4 = (band4 - band3) * rate4 + bandTax3;
			const decimal bandTax5 = (band5 - band4) * rate5 + bandTax4;
			
			if (salary > band5) 
				return (salary - band5) * rate6 + bandTax5;
			if (salary > band4) 
				return (salary - band4) * rate5 + bandTax4;
			if (salary > band3) 
				return (salary - band3) * rate4 + bandTax3;
			if (salary > band2) 
				return (salary - band2) * rate3 + bandTax2;
			if (salary > band1) 
				return (salary - band1) * rate2 + bandTax1;
			
			return salary * rate1;
		}
	}
}