CheckBook 2.1

the author of this app says:

Checkbook is an easy way to keep track of your spending habits. It can be used to enter and keep track of checking, credit card, cash and other transactions.

Within the application, you can set up accounts, and add categories and classifications. You can record payments, deposits, transfers and split transactions; you can even keep track of your paycheck details.

With the built-in reconciliation wizard, you can reconcile your bank statements and credit card bills at the end of each month; then purge the reconciled transactions to save space on your device.

You can use the transaction filter to examine your spending, and figure out just where all your money goes every month.