Quantifying technical-debt interest to prioritize modernization

Technical debt isn’t static; its “interest” shows up as slower delivery, rising run costs, and higher operational and people risk. The article proposes a practical way to estimate the true cost of delay using four lenses: opportunity cost (what’s blocked), risk exposure (security/regulatory/continuity), people dependency (tribal knowledge), and change friction (effort for small changes). It then recommends reducing interest through incremental modernization patterns (API encapsulation, targeted refactoring/replatforming, stronger observability and automated testing, and gradual replacement). Leaders can use the prioritization rule (impact + dependency + friction) to focus modernization where it measurably unlocks options.