wealthschema / benchmark / items / fb-rmd-0017
ITEM PROVENANCE · RMD-MECHANICS

fb-rmd-0017

status: publishedversion: v1corpus: 2026.9key: computedseverity: high
Scenario (all facts stipulated)
{
  "account_type": "traditional IRA (owner's lifetime distribution)",
  "prior_year_end_balance": 623000,
  "age_at_year_end": 78,
  "beneficiary_context": "surviving spouse is not the sole designated beneficiary",
  "note": "The owner attains age 78 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

28318.18 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 78, 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-c (3/3 caught)adjudicated by: — (none required or pending)
gemini-3.1-pro-previewagrees the key is correctquote matched
is equal to the quotient obtained by dividing the account balance (determined under paragraph (b) of this section) by the applicable denominatorcfr-1-401a9-5

Under § 1.401(a)(9)-5(a)(1), the required minimum distribution is calculated by dividing the prior year-end account balance 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 employee who is age 78, the applicable denominator is 22.0. Dividing the account balance of $623,000 by 22.0 yields $28,318.18, which matches the answer key.

deepseek-v4-proagrees the key is correctquote matched
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 beneficiarycfr-1-401a9-9

The scenario states the surviving spouse is not the sole designated beneficiary, so the Uniform Lifetime Table applies. For age 78, the table denominator is 22.0. Dividing the prior-year-end balance $623,000 by 22.0 gives $28,318.1818..., which rounds to $28,318.18, matching the key.

Version history & errata

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