Last episode I called credit cards, instalment plans and personal loans the enemy in your wallet. This episode I need to correct something — debt itself is not the enemy.

Some debt, used correctly, at the right time, for the right thing, is one of the most powerful financial tools available to you. The problem is that the line between the two is not obvious. And most people are asking the wrong question entirely. "Can I afford the monthly payment?" is the wrong question. There is a better one, borrowed from one of the most successful investors alive, and once you have it every debt decision you ever make becomes clearer.

In this episode I cover:

• The single question that separates productive debt from unproductive debt
• Why a mortgage does something rent never does — and why that principle can still fail in practice
• Student loans, and why "education is an investment" is too simple. The three things that have to line up before that debt makes sense
• The grey zone — cars, laptops, tools of a trade. When borrowing passes the test, and when you are just very good at convincing yourself it does
• The order that actually matters: what to clear first, what to build next, and when good debt earns its place
• What to do if you are already out of sequence, because most people are

Debt is a tool. What matters is whether you are using it, or it is using you.