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If one owns 75% of company shares, does that mean that he would have to take upon himself 75% of the company's expenses?
It depends on the business entity. If the entity is a sole proprietorship or a general partnership, the individual are considered to be the business. There are no shares, and so yes, the owner would have to take on 75% of the expenses. For example, in the event of a lawsuit, if the claimant were awarded $1,000,000, the 75% partner would be personally liable for $750,000. In the event of a corporation, there are shares, so the responsibility is on the management of the company, not the owners, to come up with money for the expenses of the business. That money can come from the business' capital, which is the money owners have put in. Basically, for a corporate entity, the owner is not responsible for 75% of expenses, for a partnership, yes, they are.