Qualifying columns with table names in sql query

If I have a table named "Salary" with two columns named "Payment" and "Rank",

for the following select statement, why do I have to qualify the second parameter "Rank" in my select statement with the table name "Salary"
and I don't have to do that for the first parameter "Payment"

Here is the correct sql statement :



select Payment, Salary.Rank from Salary INNER JOIN Ranks ON Salary.Rank=Ranks.Rank
                                INNER JOIN Jobs ON Jobs.Title = Ranks.Title                              Where Jobs.Employee = 'Jim Baker'


And here is the incorrect sql statement which gives an error message of :
Msg 209, Level 16, State 1, Line 1
Ambiguous column name 'Rank'.
Note I know that we need the table name in front of the column "Rank", but Why do we not
need to do this for the parameter "Payment" ?

select Payment, Rank from Salary INNER JOIN Ranks ON Salary.Rank=Ranks.Rank
                                INNER JOIN Jobs ON Jobs.Title = Ranks.Title                              Where Jobs.Employee = 'Jim Baker'