Using SUMIF I'm trying to get cell B13 to pull month from cell A13 to use as criteria to pull from Income sheet, however I havent been able to get it to work.

=SUMIF(Income!C:C,"="&MONTH(A13),Income!D:D)

including spread sheet.

Values are:
Currency: Japanese Yen
Date: yyyy/mm/dd
would like cell A13 to be just month and year.
version excel 2010

Thank you for any assistance,
ToriOtokoJapan Budget.xlsx