High-interest debt

Debt whose APR is high enough that paying it beats investing almost every time. Published frameworks draw the line in bands: at 10% APR and up, paying is urgent — it is a certain double-digit saving; between 5% and 10%, the order shows you the side-by-side math; under 5%, minimums usually suffice while you invest. Credit cards at 20–30% APR are the canonical case.