Another source of information will be the bills and receipts that you have received over the past quarter. If you have not kept such documents and records before, then now is a good time to start. The good organisation of your important financial documents, and orderly filing of bills and receipts, will stand you in good stead for controlling the family budget when it is set.
Instead of listing the items on a paper list the items can be just as easily listed on a spreadsheet which will add up the items as required without the requirement to double check the adding up is accurate. Such a list has a history in accounting term as a sales day book and a purchase day book. To achieve the required analysis of sales and purchases all that is required is to write into the top of each of the spreadsheet columns the titles of the analysis headings required. Then repeat the value of each transaction in the total column into the analysis columns. Use the spreadsheet technology to add up each column and you have an effective bookkeeping spreadsheet. Preparing such a bookkeeping spreadsheet might and often does suffice the needs of the smallest business enterprise and is a close step towards achieving a valuable tool for this purpose, bookkeeping software. Bookkeeping software can be as simple as a home produced spreadsheet but with additional facets that can have significant financial benefits to the business.