[header] How to manage money on a limited budget [title] Look over all financial activity for issues. [step] Report any unseen errors to the company. Such ideas to look through include all your paychecks, rent statements, car payments, grocery bills, receipts and the like. 
Make sure they are not only calculated correctly, but have the same exact items (including in quantity as well) of the items you bought during the trip. [substeps] Include minimum debt payments in the expenses.