Flood Insurance Deductible Gap Calculator

Size the cash cushion you will need if a flood claim triggers your deductible or exceeds NFIP limits. Provide estimated building and contents losses to see the insurer payout after applying coverage caps, basement exclusions, and the deductible, plus the remaining out-of-pocket exposure.

Structural repairs, drywall, electrical, HVAC, and other building components.
Furniture, appliances, and personal property lost in the flood.
Combined building and contents deductible applied to the claim.
Optional. Defaults to $250,000, the NFIP maximum for dwellings.
Optional. Defaults to $100,000, the NFIP personal property maximum.
Optional. Portion of building damage not covered (e.g., finished basement or landscaping).

This estimate simplifies NFIP rules. Verify coverage terms, exclusions, and deductibles with your insurance agent before relying on the output.

Examples

  • $180,000 building damage, $60,000 contents, $10,000 deductible, $250,000 building limit, $75,000 contents limit, $15,000 ineligible basement work ⇒ Projected flood insurance payout: $215,000.00 • Homeowner cash needed: $25,000.00 • Coverage rate: 89.58%.
  • $310,000 building damage, $85,000 contents, $5,000 deductible, optional fields blank ⇒ Projected flood insurance payout: $330,000.00 • Homeowner cash needed: $65,000.00 • Coverage rate: 83.54%.

FAQ

How do I handle separate building and contents deductibles?

If your policy applies two deductibles, run the calculator twice—once for building and once for contents—and add the out-of-pocket totals together.

Does the tool account for increased cost of compliance coverage?

No. ICC payments that help bring a property up to current codes are not included. Add any approved ICC payout to the insurer amount if you know it will apply.

Can I model private flood insurance enhancements?

Yes. Update the building and contents limits to match your private policy to see how much additional loss those higher limits could absorb.

Additional Information

  • NFIP dwelling policies cap building coverage at $250,000 and contents at $100,000; private markets may offer higher limits.
  • Basement finishes, fences, decks, and landscaping are generally excluded from standard flood coverage and increase the homeowner share.
  • Deductibles apply once per claim even when both building and contents coverage pay out.

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