Technical debt: what does it actually cost you?

A developer gets a simple request: add a field to a form. On paper, that is an hour's work. Two days later, it is done. The form was tied to three other screens, there were no tests and nobody remembered why a certain function existed.

That difference between an hour and two days is technical debt.

What technical debt is

Technical debt builds up when you once chose a quick fix, or when code simply ages while the world around it changes. That is normal. Every company with software has it.

The problem is the interest. Every new feature takes a little extra time because the old code gets in the way. And you pay that interest again every week.

Making the interest visible

You don't need a complicated calculation. Ask your team three questions:

1. Which parts of the code do you prefer to avoid?
2. Which tasks took much longer than expected in the past month? Why?
3. Which updates have we been putting off for months?

The answers show you where the interest is highest. That is where you start.

Paying it down in small steps

The biggest mistake is trying to fix everything at once. A complete rewrite takes a long time, is risky and delivers nothing for months.

This works better:

• Tests first. Tests show whether the code still does what it should after a change. Without tests, cleaning up is guesswork.
• Then small steps. One function, one module, one warning at a time.
• Approve each step separately. Small proposals are quick to review.

Where agents help

That is exactly the kind of work AI coding agents are suited to: writing tests, finding duplicate code, clearing warnings and proposing small steps. The work has a clear end point and the result is easy to check.

Deciding what comes first and what the architecture should become stays with your team. The agent does the hands-on work.

Read more about paying down technical debt or use our calculator to work out how much time is involved.