wealthschema / benchmark / items / fb-rmd-0011
ITEM PROVENANCE · RMD-MECHANICS

fb-rmd-0011

status: publishedversion: v1corpus: 2026.9key: derivedseverity: medium
Scenario (all facts stipulated)
{
  "person": "IRA owner born March 14, 1957",
  "question_context": "The owner asks at what age required minimum distributions must begin under section 401(a)(9)."
}
Question posed to the model under test

Under the current regulations, what is this owner's applicable age for required minimum distributions? Answer with exactly one option id.

Answer options
  • age-70-halfAge 70½
  • age-72Age 72
  • age-73Age 73
  • age-75Age 75
Answer key

age-73

Derivation from the cited text

The owner was born March 14, 1957, which is on or after January 1, 1951 and before January 1, 1959. Under 26 CFR 1.401(a)(9)-2(b)(2)(iv), the applicable age for an employee born in that range is age 73. The same applicable-age definition governs IRAs through 26 CFR 1.408-8's incorporation of the section 401(a)(9) rules.

Rubric

Selects age-73 based on the 1951–1958 birth-year band.

Cited primary sources (quote-gated)
In the case of an employee born on or after January 1, 1951, but before January 1, 1959, the applicable age is age 73

Each quoted passage is exact-matched, after typographic normalization, against the corpus text fetched from the issuing authority (hashes in the corpus manifest). An item whose quote stops matching fails the build.

Verification record
generator: claude-fable (session 2026-09-01)disagreements: 0controls: fb-2026-09-a (5/5 caught)adjudicated by: — (none required or pending)
gemini-3.1-pro-previewagrees the key is correctquote matched
In the case of an employee born on or after January 1, 1951, but before January 1, 1959, the applicable age is age 73cfr-1-401a9-2

The owner was born on March 14, 1957, which falls within the range of January 1, 1951, to December 31, 1958. According to the provided regulation, the applicable age for an individual born in this timeframe is 73. The key correctly identifies this and derives the correct answer.

deepseek-v4-proagrees the key is correctquote matched
In the case of an employee born on or after January 1, 1951, but before January 1, 1959, the applicable age is age 73;cfr-1-401a9-2

The IRA owner was born March 14, 1957, which falls on or after January 1, 1951 and before January 1, 1959. The cited regulation directly assigns applicable age 73 to that birth range, so the key's value of age-73 is correct.

Version history & errata

v1; no errata. Demonstrate a key error and the correction is published here, credited — challenge policy.