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Professional Liability Deductible Tradeoff Calculator

The Professional Liability Deductible Tradeoff Calculator compares two deductible choices using the annual premium and the amount you expect to retain when covered professional-liability claims occur. It turns a lower-premium/higher-deductible decision into an expected annual cost comparison rather than judging the deductible on premium alone.

Use it when reviewing errors-and-omissions or other professional liability quotes with different retentions. The result is a planning estimate, not a prediction of claims or a substitute for policy wording: defense treatment, limits, exclusions, claims-made provisions, and whether the deductible applies to defense costs can materially change the real economics.

Inputs

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Result
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Lower expected annual cost option
Expected annual cost — lower deductible—
Expected annual cost — higher deductible—
Annual premium savings with higher deductible—
Break-even claims per year—

1. Enter both deductibles
Use the amount your business would pay or retain per covered claim under each quote.

2. Add annual premiums
Enter the full-year premium for each deductible option on the same coverage basis.

3. Estimate claim frequency
Use a planning estimate for covered professional-liability claims per year; decimals are allowed.

4. Estimate claim size
Enter the average covered loss before applying the deductible.

5. Compare expected cost
Review premium plus expected retained claim cost for each option and the calculated break-even frequency.

Formula: Expected annual cost = Annual premium + Expected claims × min(Deductible, Average covered loss) Break-even claims = Premium savings ÷ [min(High deductible, Loss) − min(Low deductible, Loss)]

Where:

  • Expected claims — estimated covered claims per year
  • Deductible — retained amount per covered claim, in dollars
  • Average covered loss — estimated covered loss before the deductible, in dollars
  • Premium savings — lower-deductible premium minus higher-deductible premium, in dollars

Assumptions: Claims are modeled with a constant average loss and the deductible is assumed to apply per claim. Policy-specific defense costs, aggregates, and deductible structures are not modeled.

What the result means

Use this as a planning comparison only; actual claim costs depend on policy terms and claim circumstances.

Review the actual policy, quote, endorsements, exclusions, limits, and applicable requirements before making an insurance decision.

Given:

  • Lower deductible: $2,500; premium: $7,200
  • Higher deductible: $10,000; premium: $5,400
  • Expected claims: 0.35 per year
  • Average covered loss: $30,000

Calculation:
Lower option = 7,200 + 0.35 × 2,500 = $8,075. Higher option = 5,400 + 0.35 × 10,000 = $8,900.

Result:
The lower deductible has the lower expected annual cost by $825.

The $1,800 premium saving on the higher deductible is not enough to offset its extra expected retained claim cost under these assumptions.

What does the break-even claim frequency mean?

It is the annual claim frequency at which the two modeled options have the same expected premium-plus-deductible cost. A frequency above or below that point can favor a different option depending on the quote values.

Should I enter defense costs in the average loss?

Only if the policy applies the deductible to defense costs and your loss estimate is intended to include them. Policy wording differs, so keep the input consistent with the retention structure you are comparing.

Can the cheaper expected option still create cash-flow risk?

Yes. Expected cost averages outcomes; a high deductible can require a much larger payment after a single claim. Liquidity and risk tolerance matter in addition to the modeled average.

What if the average loss is smaller than a deductible?

The calculator caps retained loss at the entered average covered loss. That prevents a deductible from being treated as a payment larger than the modeled claim itself.

Is this the same as choosing a professional liability coverage limit?

No. A deductible affects the amount retained on a covered claim, while the policy limit concerns the maximum insurer payment subject to policy terms. Review both decisions separately.