Good Debt, Bad Debt, and the Only Number That Matters
People sort debt into 'good' and 'bad' by what it bought. That's the wrong axis. A mortgage at 14% is worse than a student loan at 4%, whatever the label says.
'Good' and 'bad' is the wrong axis
The usual framing sorts debt by what it bought: a mortgage or student loan is 'good debt', a credit card is 'bad debt'. It's a memorable rule that gives the wrong answer often enough to be dangerous.
Two things actually determine how a debt behaves. Its interest rate, and whether the thing it bought gains or loses value. A mortgage at 14% would be a terrible debt; a student loan at 4% is a cheap one. The label never moved, the rate did.
Rates in 2026 sit roughly like this: credit cards around 22%, a 30-year fixed mortgage around 6.5%, federal student loans lower still with repayment protections no private lender offers, and auto loans secured by an asset that reliably loses value.
Interest rate, and whether the asset appreciates. Everything else is branding.
Paying off debt is an investment with no risk
Clearing a balance at 22% APR is economically identical to earning 22% — except it's guaranteed, risk-free, and untaxed. No investment offers that combination.
A market return of 8% is an expectation with a wide distribution around it, and gains are usually taxable. A 22% interest cost you stop paying is certain, immediate, and permanent.
This is why the ordering usually puts high-rate debt ahead of investing, even though 'always invest early' is decent general advice. The comparison isn't 8% against 22% — it's a hoped-for 8% against a certain 22%.
Interest rate and whether the thing gains or loses value. That's the whole framework. Everything else is branding.
Sources
- Debt collection and managing debt — Consumer Financial Protection Bureau (2026)
- G.19 Consumer Credit — Federal Reserve Board of Governors (2026-Q2)