What is your tech debt actually costing you?
Updated 27 March 2026
Enter your team details and get an immediate breakdown: annual cost, weekly hours wasted, velocity tax, incident probability, and 3-year financial projections.
Tech Debt Cost Calculator
Types of Technical Debt
Technical debt takes many forms. Each category has distinct cost drivers and resolution strategies.
Architectural Debt
Monolithic codebases, tightly coupled services, and outdated design patterns that make changes expensive and risky.
Typical cost: 30-50% of engineering capacity
Code Quality Debt
Duplicate code, poor naming, missing abstractions, and overly complex functions that slow every developer who touches them.
Typical cost: 10-20% velocity reduction
Test Coverage Debt
Insufficient unit, integration, and end-to-end tests that allow regressions to reach production undetected.
Typical cost: $2,000-$15,000 per production incident
Dependency Debt
Outdated libraries, deprecated APIs, and unmaintained dependencies creating security vulnerabilities and upgrade blockers.
Typical cost: 3-8 engineer-days per major upgrade
Documentation Debt
Missing or outdated documentation, tribal knowledge concentrated in individuals, and undocumented system behavior.
Typical cost: 2-4 weeks slower onboarding per hire
Infrastructure Debt
Manual deployment processes, inconsistent environments, and ad-hoc scaling approaches that create operational fragility.
Typical cost: 5-15% additional downtime risk
Frequently Asked Questions
What is technical debt?
Technical debt is the cost of shortcuts, poor design decisions, and deferred code quality improvements made during software development. Like financial debt, it accrues interest over time - the longer it sits, the more expensive it becomes to resolve.
How do you measure technical debt?
Technical debt is typically measured through a combination of static code analysis (cyclomatic complexity, code duplication), developer surveys estimating time lost to workarounds, incident frequency analysis, and feature delivery time comparisons. Our calculator uses team size, salary data, and debt percentage to estimate annual financial impact.
What is a typical technical debt percentage?
Industry research from CAST Software suggests the average codebase carries 15-20% technical debt. Startups often carry 25-40% as they prioritize speed, while mature products with poor maintenance can exceed 50%. Best-in-class engineering organizations target below 10%.
What is a velocity tax?
Velocity tax is the percentage of sprint capacity consumed by working around, accommodating, or fixing problems caused by technical debt rather than delivering new features. A 30% velocity tax means your team delivers only 70 units of value for every 100 units of effort.
How much should we budget for technical debt repayment?
The widely-cited 20% rule suggests dedicating 20% of every sprint to technical debt reduction. Some teams use dedicated debt sprints every quarter. See our sprint budgeting guide for a framework that fits different team contexts.
Is all technical debt bad?
No. Deliberate, short-term technical debt taken knowingly to meet a deadline can be a valid business decision. The problem is undocumented, unplanned debt that accumulates without intention. The goal is to manage debt consciously, not eliminate it entirely.