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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?
Typically, no. Unless you have a detailed agreement spelling out the apportioning of costs, all operating expenses are deducted from gross income first, with the division of the proceeds coming out of net profit, in accordance with the type and % of shares you own, and per the terms of the shareholders agreement. This is a simplified answer, and does not address other methods of extraction, such as wages paid, loans to shareholders, interest paid on loans from shareholders, etc..