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.
About this calculator
This calculator shows the net annual cost after switching to a higher deductible, accounting for both the premium discount and the additional out-of-pocket cost when claims occur. The formula is: New Cost = current_premium × (1 − ((new_deductible − current_deductible) / current_deductible) × 0.15) − (claims_per_year × (new_deductible − current_deductible)). The first term calculates your revised premium: each dollar increase in deductible relative to the current level reduces the premium by 15% of that proportional change. The second term subtracts expected additional out-of-pocket costs — the deductible gap multiplied by how many claims you expect per year. A lower result than your current premium means the higher deductible saves money overall; a higher result means the extra 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 change = 1,000 − 500 = $500. Step 2: Premium reduction factor = (500 / 500) × 0.15 = 0.15. Step 3: New premium = 1,200 × (1 − 0.15) = 1,200 × 0.85 = $1,020. Step 4: Extra claim cost = 0.5 × 500 = $250. Step 5: Net new cost = 1,020 − 250 = $770. Compared to the original $1,200 premium, this represents a net saving of $430 per year.
Frequently asked questions
How much does raising my deductible typically reduce my insurance premium?
In this model, each proportional increase in your deductible reduces your premium by 15% of that ratio, 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.