Insurance Deductible Savings Calculator
Calculate the true annual cost of raising your insurance deductible, weighing premium savings against the extra out-of-pocket expense when you file a claim. Use this before changing your deductible at renewal.
Last updated: September 2026
Formula below · 3 sources (medicare.gov, content.naic.org, Wikipedia) · Updated Sep 2026
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About this calculator
This calculator shows the net annual savings from switching to a higher deductible, weighing the premium discount against the extra out-of-pocket cost when claims occur. The formula is: Net Savings = current_premium × 0.15 × log₂(new_deductible / current_deductible) − claims_per_year × (new_deductible − current_deductible). The first term is the premium discount: about 15% of the premium for each doubling of the deductible ($500 → $1,000 saves 15%, $500 → $2,000 saves 30%), consistent with the 10–30% discounts insurers typically give for doubling a deductible. The second term is the expected extra out-of-pocket cost — the deductible increase multiplied by how many claims you expect per year. A positive result means the higher deductible saves money on average; a negative result means expected claim costs outweigh the premium discount.
How to use
Example: current premium = $1,200, current deductible = $500, new deductible = $1,000, claims per year = 0.5. Step 1: Deductible doubles, so the premium discount is 15%: $1,200 × 0.15 = $180. Step 2: Extra out-of-pocket per claim = $1,000 − $500 = $500; expected per year = 0.5 × $500 = $250. Step 3: Net savings = $180 − $250 = −$70. With a claim every other year, the higher deductible costs about $70 a year more. With the default 0.2 claims a year on a $1,500 premium, the same switch saves $225 − $100 = $125 a year.
Frequently asked questions
How much does raising my deductible typically reduce my insurance premium?
In this model, each doubling of your deductible reduces your premium by 15%, but real-world savings vary by insurer, policy type, and state. Auto insurance policyholders commonly see premium reductions of 10%–30% when doubling their deductible. Homeowners insurance discounts for higher deductibles are often in the 5%–20% range. The savings are more pronounced the lower your starting deductible — moving from $250 to $500 saves proportionally more than moving from $1,000 to $1,250.
When does choosing a higher deductible actually cost more money?
A higher deductible costs more in years when you file one or more claims, because you absorb a larger share of each loss. If your expected claims per year is high — for example, 1 or more — the additional out-of-pocket cost can exceed the premium savings. This calculator makes that comparison explicit by subtracting projected extra claim costs from the premium discount. High-frequency claimants or those with aging property are often better served by a lower deductible.
What is the break-even period for switching to a higher insurance deductible?
The break-even period is how long you must go without a claim before the cumulative premium savings equal the higher deductible you would have to pay if a claim occurred. Divide the deductible increase by the annual premium savings to find the break-even year. For example, if raising your deductible by $500 saves $150 per year in premiums, you break even after 3.3 claim-free years. If you expect to go longer than that without filing, the higher deductible is mathematically advantageous.