WTF am I doing wrong?

I can't for the life of me figure it out

static void Main(string[] args)
        {
            string taxcode;
            Console.WriteLine("Please enter your taxcode [A/B]: ");
            taxcode = Console.ReadLine();
            int salary;
            Console.WriteLine("Please enter your annual salary ");
            salary = Convert.ToInt32(Console.ReadLine());
            if (taxcode == " A ")
            {
                Console.WriteLine("Tax due: " + (salary * 25) / 100);
            }
            else if (taxcode == " B " (salary => 45000))
            {
                Console.WriteLine("Tax due: " + (salary * 30) / 100);
            }
            else if (taxcode == " B " (salary < 45000))
            {
                Console.WriteLine("Tax due: " + (salary * 33) / 100);
            }
        }
    }
}

Error    1    Method name expected
Error    2    Method name expected
Error    3    A local variable named 'salary' cannot be declared in this scope because it would give a different meaning to 'salary', which is already used in a 'parent or current' scope to denote something else

>>5
Because I'm studying Computing and Math sciences at Uni and thats what we use.