Date Range filter

Hi There

I have successfully made my excel sheet with the purpose of identifying the total income for a given month in a year for cash flow purposes. This basically works with a column that creates a number for the corresponding month (eg august is 8) then a filter to add up all the payments from that particular month. We now need to do this over two years so i need to add a year function to it but can figure it out.

My current set up is:

A list of income payments in one column and the date received in a separate column and the month ID column in the third
Payment column is named Income - this has my input figures
Date column - is un-named an has the date input
Month identification column is named Month_Income - and uses formula =MONTH( x) where x is the cell with the date

In a different row across the top - i have the months Jan - Dec and below each month i have a cell telling me the total income for that month using:
=SUMIF(Month_Income,"=x",Income) - x is the corresponding month eg 8 is for august.


So now i have added a fourth column with the year named Year_Income and a formula =YEAR(x) where x is the cell with the date input.

What should the SUMIF formula look like to include my year? Ie so i can see the total income for august 2012 or july 2013 etc.... ?

Thanks

bruce,