In a nutshell, accepting the risk instead of paying for someone else to take the risk.This might be a dumb question, but what does self-insuring entail?
Accepting the risk = paying for the repair or replacement or doing without the thing if something goes wrong with it.
Some people make a separate account or column in their budget for it. Or for some types - cars, for example. But that is just to help people see where their money is and what it is doing. It isn't needed for the concept.
Edit - I type slow. This isn't instead of gtaus' explanation.
Yeah, I have, and still use, a 30+ year old pickup. I only insure it for part of the year. In the winter, I take off the insurance. It only gets about 14 mpg, but it's a good work vehicle and I drive it maybe only 1,000 miles per year. So, mpg is not a major concern. Insurance on the old pickup is less than $15.00 per month. Great vehicle for towing my utility trailer in the summer months. That is its main job.
) has some body rust. I'm sure part of the floor is rusted through. There are places where the top is leaking by the body.
One of the advantages to living outside the city, where I have lots of garage and storage space to park my cars, is that I am able to keep those older cars that I only use in the summertime. Most of our life we lived in town, in apartments, with limited parking and maybe only one or two parking spots (no garage).
Who would have thought that I would be raising chickens, gardening, spending more time on riding lawn mowers than in a car, and loving every minute of it?