Keep record of expenses and view the expenses for given period.
Add an expense entry conveniently using the interactive command
expenses-add-expense
A list of desired categories could be set using
setq expenses-category-list '(category1 category2 ..)
Set the desired destination for the expense files using
setq expenses-directory "desired/destination"
View the org file using
expenses-view-expense
Expenses for a given period like a date, month, months or year could be
calculated using appropriate interactive functions.  See the README on the github