Insurance Deductible Break-Even Calculator
Claims per year where a higher deductible breaks even with lower premium.
Find the number of claims per year where a higher deductible with lower premium breaks even with a lower deductible at higher premium.
What this tool does
This calculator shows the annual number of claims at which the premium savings from choosing a higher deductible equal the additional out-of-pocket costs you'd pay per claim. It takes two inputs: your annual premium savings by selecting the higher deductible, and the difference between the two deductibles. The result illustrates a break-even point — below this claim frequency, the lower premium typically favors the higher deductible; above it, the lower deductible may reduce total costs. The calculation assumes each claim triggers the full deductible amount and treats claim occurrence as deterministic rather than probabilistic. It does not account for claim probability, severity variation, claim denial rates, or other underwriting factors that affect real insurance outcomes. This tool is for educational illustration of the trade-off between premium and deductible structure.
Enter Values
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
200 annual premium savings with a 500 deductible increase: one extra claim in 2.5 years tips the balance. If you claim less often than once every 2.5 years, the high-deductible plan wins. More often, low deductible is better.
Rule of thumb
If your break-even is less than 1 claim every 2-3 years, the low-deductible plan is usually better if claims are common in your category. For car/home insurance where claims are rare (under one per 3 years for most people), high-deductible typically wins the cash math.
A worked example
With the defaults: annual premium savings of 200, deductible difference of 500. The tool returns 0.4 claims/yr. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.
What moves the number most
The result responds to Annual Premium Savings (Higher Deductible) and Deductible Difference. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
The formula behind this
Break-even claims is annual premium savings divided by deductible difference. Ignores claim probability distribution — treats claims as deterministic. Real expected value needs actuarial probability data. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.
Using this as a check-in
Re-run this every three months. A single reading tells you where you stand; four readings tell you whether things are improving. The trend matters more than any individual snapshot.
What this doesn't capture
The result reflects only the inputs you provide and the assumptions built into the formula. It is a simplified model rather than a complete picture, and factors specific to your situation may matter just as much.
With a £500 deductible increase and £200 annual savings, you break even at 0.4 claims/yr claims per year.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
The calculator computes break-even claims per year by dividing annual premium savings by the deductible difference. This represents the number of claims needed annually for the reduction in premiums to offset the increase in out-of-pocket costs from the higher deductible. The model assumes claims occur at a constant, predictable rate and treats each claim as equally likely. It does not account for actual claim probability distributions, claim severity variation, claim processing delays, or the timing of claims within the year. For a more complete analysis of whether a higher deductible is financially advantageous, you would need historical claim frequency data and probability-weighted expected values specific to your circumstances.
References
Frequently Asked Questions
What claim rate is realistic?
Does this include claim severity?
What's the risk of high deductible?
When does low deductible always win?
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