Where did the expression monthly nut come from?

The expression "monthly nut" originated from the financial and business world, referring to the total monthly expenses or financial obligations a person or business needs to cover. The term "nut" symbolizes a necessary payment or expense that must be met, similar to how a "nut" is essential for certain animals. It became popular in the context of budgeting and financial planning, emphasizing the importance of managing these recurring costs to maintain financial stability.