Here’s a typical example, provided for me from a neighbour, at my request.
Inside we have one face per month.
The booklet itself occupies very little space, but we can load the inside with every cyclic expense in the coming year, the better to budget and plan our expenses.
Note the date of replacement of each printer cartridge.
Note the quantity of postage stamps at each purchase
Note subscriptions to networking groups, ISPs, domain registration and the like.
Now you have no excuse for ignorance of upcoming expenses as they fall due.
And yes, the booklet lives on your desk, close to your keyboard and phone!