Who of us does not know that. At the end of the money there is plenty of the month left, and is usually used by the Gasworks and the goldfish breeders' club to collect their annual fee (including the price increase) from your account.
I also had a time when I had to do a lot of financial juggling to live from month to month, even though I had as much money as today. I just did not have under control as well as I now have. The heart of the problem was actually that I almost never knew how much of the money in my account was really free to spend, and what bills would come up in the near future.