Auto Insurance Deductible

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Disclaimer

This calculator provides estimates for informational purposes only and does not constitute financial, medical, legal, or tax advice. Always consult a qualified professional about your specific situation.

How the Deductible Break-Even Is Calculated

A higher auto insurance deductible almost always lowers your premium, but raises what you pay out of pocket if you file a claim. Enter both deductible options and their quoted annual premiums, and this calculator finds the break-even point — how many claim-free years of premium savings it takes to equal the larger deductible.

The Formula

  • Premium savings per year = Lower-Deductible Premium − Higher-Deductible Premium.
  • Deductible difference = Higher Deductible − Lower Deductible.
  • Break-even period = Deductible Difference ÷ Premium Savings per Year.
  • Expected annual cost (optional, if a claim probability is entered) = Premium + (Claim Probability × Deductible).

Worked Example

A $500 deductible at $1,200/year, versus a $1,000 deductible at $1,000/year:

  1. Premium savings per year: $200 ($1,200 − $1,000).
  2. Deductible difference: $500 ($1,000 − $500).
  3. Break-even period: 2.5 years ($500 ÷ $200).
  4. 5-year savings if claim-free: $1,000 ($200 × 5).

Key Factors to Consider

  • Comprehensive and collision often carry separate deductibles. Many policies let you set a different deductible for comprehensive coverage (theft, weather, animal collisions) than for collision coverage (an accident) — check whether you’re comparing the same coverage type on both sides of your break-even calculation.
  • A newer or higher-value vehicle changes the math. The dollar amount at stake in a claim scales with your vehicle’s value, so the same deductible difference represents a smaller relative risk on an expensive newer car than on an older vehicle worth much less.
  • Multiple claims in a short period compound the tradeoff. The break-even calculation assumes a single claim scenario — if you’re at meaningfully elevated risk of filing more than one claim in the relevant period (a higher-risk driving situation, an area prone to weather damage), that tips the math further toward a lower deductible.
  • Filing a claim can also affect your future premium, beyond just the deductible. Insurers may raise your premium after a claim regardless of which deductible you chose — this calculator’s break-even math focuses on deductible savings, not on how filing a claim might change your premium going forward.

Common Mistakes

  • Only looking at the premium difference. A small premium savings can still take many years to offset a much larger deductible — the break-even period is what actually matters for the comparison.
  • Choosing a deductible you couldn’t actually afford to pay. A higher deductible only makes sense if you’d genuinely have that amount available — check the Emergency Fund Calculator first.
  • Comparing quotes from only one insurer. The best deductible strategy still depends on finding a competitive premium in the first place — see the Auto Insurance Cost Calculator.

Useful to Know

Filing a claim can raise your premium regardless of your deductible, which sometimes makes a small claim near your deductible amount a net loss. If a repair costs only slightly more than your deductible, paying out of pocket and never filing a claim at all can leave you better off than filing — since a filed claim, even a small one, can trigger a premium increase this calculator’s break-even math doesn’t account for. Weigh a marginal claim’s near-term payout against its potential effect on your future premium, not just the deductible math alone.

Source: NAIC: A Consumer's Guide to Auto Insurance -- Deductibles.

Frequently Asked Questions

How do I decide between a lower and higher deductible?

A higher deductible almost always means a lower premium, since you're agreeing to cover more of a claim yourself. This calculator finds the break-even point: how many years of premium savings it takes to equal the extra amount you'd pay out of pocket if you filed a claim. If you expect to keep the policy claim-free longer than that, the higher deductible usually comes out ahead.

What is an expected annual cost comparison, and why is it optional?

If you enter a rough estimate of how likely you are to file a claim in a given year, this calculator also compares each option's expected annual cost (premium plus your claim probability times the deductible). This is optional because there's no reliable universal claim-frequency figure to look up -- it genuinely depends on your own driving history and risk tolerance, so it's left as your own estimate rather than a fabricated default.

Should I always pick whichever deductible has the lower break-even period?

Not necessarily -- a shorter break-even period means the higher deductible pays off sooner, but you should also make sure you'd genuinely have that higher deductible amount available in savings if you needed it. A lower deductible with a higher premium can still be the right choice if a larger unexpected bill would be a real financial strain.

Do comprehensive and collision coverage use the same deductible?

Not necessarily -- many policies let you set separate deductibles for comprehensive coverage (theft, weather, animal collisions) and collision coverage (an accident). Make sure you're comparing the same coverage type when running this calculator, since your comprehensive and collision deductibles could reasonably be set differently.

Does filing a claim affect my premium beyond just the deductible I chose?

It can -- insurers may raise your premium after a claim regardless of which deductible you had, since a claim can affect your overall risk profile in their eyes. This calculator's break-even math focuses specifically on deductible-related savings, not on how filing a claim might change your future premium.

Does raising my deductible affect my coverage limits too?

No -- the deductible only changes how much you pay out of pocket before coverage kicks in on a claim. Your policy's coverage limits (the maximum amount the insurer will pay) are set separately and aren't affected by which deductible you choose.

Can I set a different deductible for each vehicle on a multi-car policy?

Usually, yes -- most insurers let each vehicle on a multi-car policy carry its own deductible, so you can size the deductible to each vehicle's value and how large a typical claim on it would realistically be, rather than using one deductible across every car on the policy.

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