decimal GetTaxes(decimal salary)
{
    var rates = new[]
    {
        new { Threshold = 40230.0m, Rate = 0.45m },
        new { Threshold = 21240.0m, Rate = 0.33m },
        new { Threshold = 14070.0m, Rate = 0.3m },
        new { Threshold = 8660.0m, Rate = 0.23m },
        new { Threshold = 5070.0m, Rate = 0.14m },
        new { Threshold = 0.0m, Rate = 0.1m },
    };
    
    decimal tax = 0;
    foreach (var r in rates)
    {
        decimal slice = salary - r.Threshold;
        if (slice <= 0)
            continue;
        tax += r.Rate * slice;
        salary -= slice;
    }
    
    return tax;
}