the tax thingy

tax.cs

public decimal GetTaxes(decimal salary)
{
	var taxBrackets = new[]
						{
							new {UpperLimit = 5070m, Taxation = 0.10m},
							new {UpperLimit = 8660m, Taxation = 0.14m},
							new {UpperLimit = 14070m, Taxation = 0.23m},
							new {UpperLimit = 21240m, Taxation = 0.30m},
							new {UpperLimit = 40230m, Taxation = 0.33m},
							new {UpperLimit = decimal.MaxValue, Taxation = 0.45m},
						};

	var taxSlices = new[] {new {UpperLimit = 0m, Taxation = 0m}}
                .Concat(taxBrackets)
                .Zip(taxBrackets,
                     (previousBracket, taxBracket) => new
                                                          {
                                                              Slice = taxBracket.UpperLimit - previousBracket.UpperLimit,
                                                              taxBracket.Taxation
                                                          });

	var tax = 0m;

	foreach (var taxSlice in taxSlices)
	{
		var taxedSlice = Math.Min(taxSlice.Slice, salary);
		tax += taxedSlice * taxSlice.Taxation;
		salary -= taxedSlice;
	}

	return tax;
}

I could not resist to create a version that determine its own slices :)

Added some Zip love, much nicer solution now.