How do I measure the tax benefit for an uncertain tax position using the cumulative probability approach?

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AcadiFi · Accepted Answer

The measurement step under ASC 740-10 requires you to order the possible outcomes from largest to smallest and accumulate probabilities until you reach greater than 50%. The first outcome whose cumulative probability exceeds 50% is the measured benefit — this is the 'largest amount of benefit that is cumulatively more than 50% likely to be realized'. For Stormgate: | Outcome | Probability | Cumulative | |---|---|---| | $40M | 20% | 20% | | $28M | 35% | 55% ← cross 50% | | $15M | 30% | 85% | | $0 | 15% | 100% | The $28M level is where cumulative probability first exceeds 50%, so the recognized benefit is $28M. The UTB = $40M claimed − $28M recognized = $12M, booked as a liability. ```mermaid flowchart TD A[Step 1
Recognition Test] --> B{More Likely
Than Not?} B -->|Yes| C[Step 2
Measurement] B -->|No| D[Recognize
Zero Benefit] C --> E[Rank Outcomes
Largest First] E --> F[Accumulate
Probability] F --> G[Cross 50%
Threshold] ``` This is NOT expected value (which would be 0.2×40 + 0.35×28 + 0.30×15 + 0.15×0 = $22.3M). The cumulative-probability rule is deliberately more conservative for large-benefit outcomes and less conservative for small ones, reflecting settlement negotiation dynamics.

How do I measure the tax benefit for an uncertain tax position using the cumulative probability approach?

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