Good debt must have clear economic logic
A debt is only worth considering when its intended use has the potential to create greater value than the cost of the loan. That value could be cash flow, earning capacity, an asset with reasonable appreciation potential, or an essential benefit controlled by affordability. If the loan is only for short-term consumption but extends the debt repayment obligation, the risks are often greater than the benefits.
The real cost of debt is not just the nominal interest rate
When evaluating debt, it is necessary to calculate the actual interest rate paid, fees, term, penalty conditions, interest rate fluctuations and impact on monthly cash flow. A loan with a low interest rate but a long term and illiquid assets can still create great pressure. On the contrary, a loan with a clear purpose, reasonable repayment rate and good backup plan can be acceptable.
Debt repayment ratio is a safety barrier
Before taking out a loan, see what percentage of your monthly repayment obligations represent your stable income. If this ratio is too high, you lose flexibility when income decreases or expenses increase. For individuals just building a financial foundation, you should keep your debt-repayment ratio at a conservative level and always have an emergency fund before using large leverage.
The core principle is to borrow in bad scenarios, not in good scenarios
Many debt looks reasonable when income is rising, interest rates are low and markets are favorable. But a safe loan plan must survive when income falls, interest rates rise, or assets do not appreciate as expected. If even a small incident causes you to lose your ability to repay the loan, the loan is not suitable even if the original purpose seems good.