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

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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.