Corrections

Corrections are part of the product.

Cost data changes and models can contain errors. We review credible correction requests against the cited evidence and model logic.

What we correct

Material factual errors, broken or mischaracterized sources, calculation defects, misleading labels, and outdated claims that change a reader's understanding.

How to report an issue

Use the contact page and include the page URL, the statement or calculation at issue, and any supporting source.

What changes after a correction

We update the content or model, change the visible update date when appropriate, and preserve model-version discipline for calculator changes.