I’m in the US.
I’m assuming you don’t mean the actual monetary amounts that sociologists use to divide up the classes. Actually, socio-economic levels more specifically include education levels and psychographics like how you spend your money, types of activities and travel.
Poor is having almost no savings, needs some sort of public assistance to live on their own.
Middle class is a huge category and should be divided into lower-middle, middle-middle, and upper-middle.
The lower middle can afford some nice things, and live in middle class neighborhoods, but usually it’s precarious and they live check to check or just slightly better, and have very little savings.
Middle-middle can afford nice vacations, live in a nice neighborhood, can save for the future if they don’t spend all of their money. They might own a luxury car or might not.
Upper-middle have a lot of discretionary income. They can afford expensive homes, might have two homes, might have luxury cars, which they can pay for in full if they choose to. Can retire by 65 and sustain their lifestyle without working.
Part of the upper class is new money and part is old money.
New money tends to be more showy, buying things with their wealth to show their accomplishments.
The old money is kind of in a class all to themselves. They don’t have to work to be rich, they are wealthy in every way. Their assets and their income are so high that they have plenty of money and don’t have to worry for generations unless something catastrophic happened in the country. They know who is in their club.