Nested if formula (Excel)

Question

Hi I am trying to write a formula where if cell (J$4) = 1120 then it would run one statement, whereas if cell (J$4) = 1120s it would run another. I am using index-match to lookup the appropriate value. However, I can't seem to get my formula to work and I was wondering if you guys can find my error. The error is 'you've entered too many arguments for this function'. Any help would be appreciated! Thank you!

formula:

=IFERROR(IF(J$4="1120S",INDEX(B1HY3!$A$3:$F$300,MATCH("L 22a",B1HY3!$F$3:$F$300,0),5),IF(J$4=1120,INDEX(B1HY3!$A$3:$f$300,MATCH("L 22a",B1HY3!$f$3:$f$300,0),5)+INDEX(B1HY3!$A$3:$F$300,MATCH("L 22b",B1HY3!$F$3:$F$300,0),5),0),0)

Answer 1

Always try to follow parentheses' colors it is quite useful when handling with large formulas,furthermore try always to evaluate your formulas to check where the error is. It worked for me:

=IFERROR(IF(J$4="1120S",INDEX(B1HY3!$A$3:$F$300,MATCH("L 22a",B1HY3!$F$3:$F$300,0),5),IF(J$4=1120,INDEX(B1HY3!$A$3:$F$300,MATCH("L 22a",B1HY3!$F$3:$F$300,0),5)+INDEX(B1HY3!$A$3:$F$300,MATCH("L 22b",B1HY3!$F$3:$F$300,0),5))),0)

It was nessesary to close the parenthesis of the second if