Could be much better.

I love how easy and simple it is to use the application. But one flaw I found about this application is the due date for the bills. You can change it from daily, weekly, monthly, or yearly. I usually pay bills monthly and have my option set as that but when you do this, the due date for your bill will always be on the same day of every month. For example I want to pay my bills starting at the end of April, which ends on the 30th day. Next month I do not want to pay my bills on May 30th but on the 31st. We should be able to put a setting where we pay our bills at the end of every month. Not only one chosen day of every month.

Yoshiko Okada about Bills, v1.0