Sorting And Retrieving Data Based On Two Columns?

I am working on a new budget spreadsheet that I am creating. I want to accurately calculate credit card expenses. As everyone who has a credit card knows, charges made this month are not due to be paid until next month. To make matters more complex, charges made from (for example) January 20 until February 19 are not due to be paid until March 20. With that in mind, I created a spreadsheet with a different tab for each month. Each tab has a place to put in all expenses. Here is an example:

date
Category
Expenses
Remarks

[Code].....

Obviously, The above example is from January. IN the February tab, I want to calculate everything in the "Expense" column that has a date in the "Date" Column before Jan 20 and where it says "Kohls - Frank" in the Category column. Of course, in the March tab, I would need to grab all of the "Kohls - Frank" expenses after Jan 20 from the January tab, and everything before Feb 20 from the February tab.

I figured out how to add up everything with the following formula: =SUMIF(Jan!A:A,("<="&DATE(2013,1,20)&E32),Jan!C:C) How can I filter on the Category tab?