# Balance (volume)

A derived, as-of query result computed from postings — never authoritative mutable state; any materialized form is rebuildable from the log.

- Source: [Ledgerbook glossary](/glossary/)
- Related: [Accounting data layer](/glossary/accounting-data-layer/), [Ledger of record](/glossary/ledger-of-record/), [Bitemporal ledger](/glossary/bitemporal-ledger/)