Glossary
Financial planning terms
Short explanations of terms used across OpenBook Planning calculators, references, articles, and reports.
How to use this glossary
Plain terms, calculation context
These pages explain what a term usually means, how it appears in OpenBook calculators, and which assumptions or limitations commonly matter. They are educational explanations, not official legal, tax, accounting, mortgage, or investment definitions.
Term list
Core terms
The glossary is grouped by subject area, then ordered by how the terms usually appear in calculator logic. It is not alphabetical.
Reference navigation
Explore related references
Reference pages
Use carefully
Educational limits
Glossary pages simplify technical terms so they can be used consistently across calculators and educational content. A term may have a more specific meaning in tax law, pension legislation, mortgage underwriting, investment reporting, or another source document.