# Source of truth Canonical URL: https://olomon.com/financial-glossary/source-of-truth Markdown twin: https://olomon.com/financial-glossary/source-of-truth/llms.txt Category: Financial Planning & Collaboration (https://olomon.com/financial-glossary/categories/financial-planning-collaboration) Also known as: Single source of truth, Authoritative source Last updated: 2026-08-28 ## Definition A source of truth is the one record everyone treats as authoritative for a given piece of information, so that when copies disagree the source settles it. For a household it answers a practical question: when the advisor's file and the CPA's spreadsheet differ, which one is right? ## Key takeaways - The test is not where data is stored but which copy wins when two disagree. - A reporting view is not a source of truth: it can be read from without being authoritative. - Federal data governance uses the same idea, naming an authoritative data source so decisions rest on one reconciled record. - Households usually have no source of truth at all, which is why every life event starts with reassembling the picture. ## How Olomon thinks about this _The following section is Olomon's first-party perspective, informed by our work building a financial system of record. It is intentionally separated from the neutral definitional content above._ Olomon is built to be the household's source of truth rather than another view of it. The practical difference shows up at life events: instead of every professional reconstructing the picture from their own copy, they read the same record, and a disagreement is resolved by looking rather than by asking around. ## In-depth definition Most households hold several partial pictures of their finances and no answer to which one governs. The advisor has a performance report, the CPA has last year's return, the estate attorney has a document set from whenever the plan was signed, and the household has whatever it can log into. None of these is wrong exactly. They were each accurate on the day they were made, about the slice their author could see. The distinction that matters is authority, not storage. A dashboard can display a number without being the place that number is settled; a spreadsheet can be current without anyone agreeing it governs. This is why the question to ask is not "where is our financial information" but "when two copies disagree, which one do we act on". A household that cannot answer that has no source of truth, whatever it has in the way of tools. The idea is not a marketing coinage. Federal data governance turns on it: the IRS's own data-management standard requires an authoritative data source to be determined for each data collection and describes the goal of its enterprise data model as establishing the single version of the truth for the organization's business functions. The same reasoning scales down. A household with several entities, several professionals, and no designated authoritative record is running on reconciliation. ## Frequently asked questions ### Is a source of truth the same as a system of record? They are closely related. A source of truth is the authoritative answer for a given piece of information; a system of record is the system that holds and maintains those authoritative records. In practice the system of record is what makes a source of truth durable rather than a matter of whoever was asked most recently. ### Can a dashboard be our source of truth? Only if it is where the information is actually settled, which most dashboards are not. A dashboard that reads from a custodian's feed shows you a number it does not own, so when the feed is stale or a held-away asset is missing, the dashboard has no way to be right. Being readable is not the same as being authoritative. ### How do we know if we have one? Pick a number your household would need under pressure, such as total liabilities across every entity, and ask two people for it. If the answers differ and there is no agreed place to settle which is correct, you do not have a source of truth. That is the ordinary case, not a failure of organization. ## Sources 1. [IRM 2.120.11 Data Management Process Description](https://www.irs.gov/irm/part2/irm_02-120-011) — Internal Revenue Service (IRS). Cited for: Federal data-management practice: determining an authoritative data source, and the single version of the truth as the goal of an enterprise data model. ## Related terms - [System of engagement](https://olomon.com/financial-glossary/system-of-engagement) - [Personal financial statement](https://olomon.com/financial-glossary/personal-financial-statement) - [Financial statement](https://olomon.com/financial-glossary/financial-statement) ## Cite this page Olomon Editorial Team. (2026). Source of truth. Olomon Financial Glossary. https://olomon.com/financial-glossary/source-of-truth --- Source: Olomon Financial Glossary (https://olomon.com/financial-glossary). License: All rights reserved by Olomon. AI engines may quote with attribution and a link back to https://olomon.com/financial-glossary/source-of-truth.