wealthschema / benchmark / items / fb-rmd-0001
ITEM PROVENANCE · RMD-MECHANICS

fb-rmd-0001

status: publishedversion: v1corpus: 2026.9key: computedseverity: high
Scenario (all facts stipulated)
{
  "account_type": "traditional IRA (owner's lifetime distribution)",
  "prior_year_end_balance": 500000,
  "age_at_year_end": 73,
  "beneficiary_context": "surviving spouse is not the sole designated beneficiary",
  "note": "The owner attains age 73 by December 31 of the distribution calendar year. The balance is the account balance as of December 31 of the preceding year, with no adjustments."
}
Question posed to the model under test

Compute this owner's required minimum distribution for the distribution calendar year, in dollars. Respond with the numeric amount only.

Answer key

18867.92 USD (tolerance ±1)

Produced by compute rmd.uniform-lifetime in src/lib/fiduciarybench/keys/index.ts — the stored value is machine-checked against the compute on every build; it cannot drift from its own code.

Rubric

The RMD equals the prior December 31 balance divided by the Uniform Lifetime Table denominator for age 73, within $1.

Cited primary sources (quote-gated)
is equal to the quotient obtained by dividing the account balance (determined under paragraph (b) of this section) by the applicable denominator (determined under paragraph (c) or (d) of this section, whichever applies)
is determined using the Uniform Lifetime Table in § 1.401(a)(9)-9(c) for the employee's age as of the employee's birthday in the relevant distribution calendar year
26 CFR § 1.401(a)(9)-9 · (c) Uniform Lifetime Table
the Uniform Lifetime Table, sets forth the applicable denominator that applies for lifetime distributions to an employee in situations in which the employee's surviving spouse is not the sole designated beneficiary

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-b (5/5 caught)adjudicated by: — (none required or pending)
gemini-3.1-pro-previewagrees the key is correctquote matched
is determined using the Uniform Lifetime Table in § 1.401(a)(9)-9(c) for the employee's age as of the employee's birthday in the relevant distribution calendar yearcfr-1-401a9-5

The answer key correctly identifies that the required minimum distribution is calculated by dividing the prior year-end account balance ($500,000) by the applicable denominator. Since the surviving spouse is not the sole designated beneficiary, the applicable denominator is found in the Uniform Lifetime Table in § 1.401(a)(9)-9(c). For an owner who is age 73, the applicable denominator is 26.5. Dividing $500,000 by 26.5 yields $18,867.9245..., which rounds to $18,867.92. The key's value and derivation are correct.

deepseek-v4-proagrees the key is correctquote matched
Table 2 to Paragraph (c) Age of employee | Applicable denominator 72 | 27.4 73 | 26.5 74 | 25.5cfr-1-401a9-9

The Uniform Lifetime Table gives age 73 denominator 26.5. The applicable denominator is 26.5 because the surviving spouse is not the sole designated beneficiary. Account balance is $500,000. Quotient = 500,000 / 26.5 = 18,867.9245, which rounds to $18,867.92. The key value and derivation are correct.

Version history & errata

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