This is an excellent question. Saturn is the planet of self-limiting beliefs and Karma. Because his placement in the 8th house will be self-limiting, Saturn in the 8th house person will have a lot of trouble earning money. Saturn in the 8th will have all sorts of naysayers and people who will try to pull them down, so they will have to be careful with money and make sure they are not taken advantage of.
Saturn is a malefic planet, but when placed in the 8th house, it gives a lot of good results. Saturn placed in the 8th house will give good results in the following cases: If the 8th house is also occupied by benefic like Jupiter, Venus or Mercury, then Saturn will give a gain of wealth, longevity and reputation. Saturn will present good results even when it is in a debilitated or combustible state. Saturn will give good results in the following cases:
Saturn is the planet of restriction. In general, it symbolizes obstacles, limitations, discipline and structure. In the 8th house, Saturn represents the financial difficulties, blocked resources and issues related to theft. Saturn’s position in the 8th house determines how people manage their own finances and saves money. In general, Saturn’s placement in the 8th house is not favorable. It indicates that you have to earn a lot, though you might be discouraged initially.