When is it generally a good idea to borrow money and repay it with future income?

Borrowing money and repaying it with future income is typically considered a sound financial decision when the borrowed funds are used for an investment that will likely lead to increased earnings. In this scenario, using borrowed funds to purchase a car that is necessary for obtaining a much better-paying job exemplifies a judicious use of debt. In essence, the car acts as a tool to enhance the person's income potential, thereby justifying the decision to take on debt.

Investments in one's professional future, such as acquiring necessary transportation for a job with better compensation, are generally viewed as a proactive financial strategy. This approach not only addresses immediate needs but also aligns with long-term financial goals—an investment that can yield returns greater than the cost of borrowing.

Other scenarios, like borrowing for a vacation or citing high-interest rates, do not typically provide the same financial value. Borrowing for non-essential lifestyle choices can lead to unnecessary debt without a corresponding increase in income. Additionally, high-interest rates can significantly increase the cost of borrowing, making it less attractive compared to timing investments when rates are lower. While having an excellent credit score can facilitate borrowing under favorable terms, it does not, in itself, justify taking on debt without a purpose that enhances income or financial stability.