Luma Payroll Gym
← Heatmap / Gemini 3.1 Flash Lite · Task 40
Gemini 3.1 Flash Lite · Single-turn · Task 40 (Calculation, wage cap binds) Mean -40.0%
Field Expected Rollout #1 (-40%) Rollout #2 (-40%) Rollout #3 (-40%)
decision calculate calculate calculate calculate
currency LCR LCR LCR LCR
gross pay 9539.93 9539.93 9539.93 9539.93
employee contribution 200.00 200.00 200.00 200.00
allowed deduction 123.64 123.64 123.64 123.64
taxable pay 9216.29 9216.29 9216.29 9216.29
income tax 1435.26 1443.26 1443.26 1443.26
net pay 7781.03 7773.03 7773.03 7773.03
clauses R1 R2 R3 R4 R5 R6 R1 R2 R3 R4 R5 R6 R1 R2 R3 R4 R5 R6 R1 R2 R3 R4 R5 R6
Prompt
Process this monthly payroll record under the supplied rulebook. Return the R6 or R7 JSON answer.
Source documents: {"087f1008f556d1d3-payroll": {"kind": "payroll", "record": {"gross_pay": "9539.93", "payroll_month": "2026-08", "allowed_deduction": "123.64"}}}
Authoritative case reference schedule: {"first-half": {"rate": "0.06", "cap": "4000.00", "deduction": "400.00", "free": "1200.00", "upper": "3300.00", "middle_rate": "0.12", "upper_rate": "0.20"}, "second-half": {"rate": "0.04", "cap": "5000.00", "deduction": "400.00", "free": "1000.00", "upper": "3600.00", "middle_rate": "0.12", "upper_rate": "0.20"}}
Rollouts
Rollout #1 -40.0% wrong income tax · 1.0s · $0.0008
ComponentScoreClauses
decision 100.0% R1 R2 R3 R4 R5 R6
exact 0.0% R1 R2 R3 R4 R5 R6
field accuracy 50.0% R1 R2 R3 R4 R5 R6
citations 100.0% R1 R2 R3 R4 R5 R6
Assistant
{
  "decision": "calculate",
  "currency": "LCR",
  "gross_pay": "9539.93",
  "employee_contribution": "200.00",
  "allowed_deduction": "123.64",
  "taxable_pay": "9216.29",
  "income_tax": "1443.26",
  "net_pay": "7773.03",
  "clauses": ["R1", "R2", "R3", "R4", "R5", "R6"]
}
Rollout #2 -40.0% wrong income tax · 1.0s · $0.0008
ComponentScoreClauses
decision 100.0% R1 R2 R3 R4 R5 R6
exact 0.0% R1 R2 R3 R4 R5 R6
field accuracy 50.0% R1 R2 R3 R4 R5 R6
citations 100.0% R1 R2 R3 R4 R5 R6
Assistant
{
  "decision": "calculate",
  "currency": "LCR",
  "gross_pay": "9539.93",
  "employee_contribution": "200.00",
  "allowed_deduction": "123.64",
  "taxable_pay": "9216.29",
  "income_tax": "1443.26",
  "net_pay": "7773.03",
  "clauses": ["R1", "R2", "R3", "R4", "R5", "R6"]
}
Rollout #3 -40.0% wrong income tax · 1.5s · $0.0010
ComponentScoreClauses
decision 100.0% R1 R2 R3 R4 R5 R6
exact 0.0% R1 R2 R3 R4 R5 R6
field accuracy 50.0% R1 R2 R3 R4 R5 R6
citations 100.0% R1 R2 R3 R4 R5 R6
Assistant
{
  "decision": "calculate",
  "currency": "LCR",
  "gross_pay": "9539.93",
  "employee_contribution": "200.00",
  "allowed_deduction": "123.64",
  "taxable_pay": "9216.29",
  "income_tax": "1443.26",
  "net_pay": "7773.03",
  "clauses": ["R1", "R2", "R3", "R4", "R5", "R6"],
  "explanation": "Calculation based on second-half schedule: contribution 5000 * 0.04 = 200.00; taxable 9539.93 - 200.00 - 123.64 = 9216.29. Tax: (3600-1000)*0.12 + (9216.29-3600)*0.20 = 312.00 + 1123.26 = 1443.26."
}