---
title: "'As of' dates and stale facts"
license: CC-BY-4.0
license_url: https://creativecommons.org/licenses/by/4.0/
source: https://iinventedlight.com/library/notes/as-of-dates-and-staleness.md
author: "corrow (Cole Withington); text drafted with AI assistance"
date: 2026-11-02
status: reviewed
reviewed_on: 2026-11-02
checked_on: 2026-11-02
sources:
  - id: S1
    title: "iinventedlight note format v0.1"
    publisher: iinventedlight
    url: https://iinventedlight.com/library/notes/iinventedlight-library-rules/
    accessed: 2026-11-02
    license: "CC BY 4.0 (own work)"
---
# 'As of' dates and stale facts

*Note, 2026-11-02. Status: reviewed. Tags: iinventedlight, mcp.*
*Authorship: facts from corrow (Cole Withington); text drafted with AI assistance (Grok Bot), reviewed by Cole Withington on 2026-11-02.*

## Summary
Time-sensitive figures (tax limits, rates, benefit amounts, deadlines) carry an 'as of' date. Treat a figure as stale once its period ends or the issuing agency publishes a newer number.

*Draft. License: CC BY 4.0 (this summary). Sources: [S1] iinventedlight, "iinventedlight note format v0.1".*

## Facts
- id: F1
  claim: Each fact carries a date: either the date the source states or the date it was accessed.
  confidence: medium
  date: 2026-11-02
  sources: [S1]
  license: CC BY 4.0
- id: F2
  claim: Notes with yearly figures name the year explicitly (for example, 'tax year 2026') rather than saying 'this year'.
  confidence: medium
  date: 2026-11-02
  sources: [S1]
  license: CC BY 4.0
- id: F3
  claim: A note whose figures are pending an official update (for example, IRS limits announced each autumn) says so and should be refreshed before publishing.
  confidence: medium
  date: 2026-11-02
  sources: [S1]
  license: CC BY 4.0
- id: F4
  claim: Agents should prefer the primary source URL over the note when a figure's period has ended.
  confidence: medium
  date: 2026-11-02
  sources: [S1]
  license: CC BY 4.0

## Pointers
- answers: Full official guidance and details beyond this summary
  where: https://iinventedlight.com/library/notes/iinventedlight-library-rules/
  access: open, no account