Need formula to zero payment amount made if month changed

[MannyLNJ]

I'm still working on my financial spreadsheet. I have a page in the spreadsheet where I have the date a bill was last paid and the amount of the last payment.

Column C=Amount of the bill
Column D=Bill Due Date
Column E=Last date paid
Column G=Amount Paid This Month
Column H=Due Date
Column I=Amount Still Due this month

See attached example