It runs in three directions, and only one of them is what people picture. The first is fraud against the insurer, committed by an applicant or a claimant: a claim that never happened, a claim inflated beyond the actual loss, an application understating a risk. The second is fraud by someone inside the business, which is aimed at insurers, at consumers, or at both: a producer pocketing premium and never placing the policy, a repair or medical provider billing for work not done, an officer misstating a company's condition to a regulator. The third is fraud by an entity that is not an insurer at all, selling coverage that does not exist, which leaves the buyer with no coverage and no guaranty-fund protection because the seller was never admitted.
Federal law aims squarely at the second of those, and it says so in the statutory text. 18 U.S.C. section 1033 is headed "Crimes by or affecting persons engaged in the business of insurance whose activities affect interstate commerce". Subsection (a) makes it an offense for a person engaged in the business of insurance to knowingly, with intent to deceive, make a false material statement or willfully and materially overvalue property in connection with financial reports presented to an insurance regulator for the purpose of influencing that regulator, punishable by a fine or up to 10 years, rising to 15 where it jeopardized an insurer's safety and soundness and significantly caused it to be placed in conservation, rehabilitation or liquidation. Subsection (b) covers embezzlement of an insurer's funds and subsection (c) false entries about financial condition. Both of those subsections carve out, in terms, a person involved "other than as an insured or beneficiary under a policy of insurance". Subsection (e) then bars anyone convicted of a felony involving dishonesty or breach of trust from willfully engaging in the business of insurance without written consent. So the federal statute most often cited in this area is not the law a policyholder breaks by padding a claim; the claimant-side offenses are state law.
Soft fraud is where most of the volume sits, and calling it soft describes the intent rather than the legal exposure. Padding a real claim with an item that was not damaged, adding a pre-existing dent to a collision claim, describing a car as garaged at a cheaper address, understating who drives it: these are opportunistic rather than planned, and they are prosecutable in the same way as a staged loss. Hard fraud, the deliberately manufactured loss, is rarer and attracts the attention, which is part of why the soft end is underestimated by the people committing it.
The consequence that catches people is contractual, and it arrives whether or not anyone is prosecuted. Property policies carry a concealment or fraud condition. The federal government's Standard Flood Insurance Policy is the version whose text is published, at 44 CFR Part 61 Appendix A, and it is instructive because it is unusually explicit. The policy provides that "with respect to all insureds under this policy, this policy is void and has no legal force and effect if at any time, before or after a loss, you or any other insured or your agent have, with respect to this policy or any other NFIP insurance", concealed or misrepresented a material fact or circumstance, engaged in fraudulent conduct, or made false statements. It adds that policies voided in that way "cannot be renewed or replaced by a new NFIP policy"; that policies "are void as of the date the acts described in A.1 above were committed"; and that "fines, civil penalties, and imprisonment under applicable Federal laws may also apply."
Read the four elements together and the exposure is much larger than the amount in dispute. The voidance reaches every insured on the policy, not only the one who lied. It reaches acts committed before the loss as well as after it, so a misstatement on the application counts. It reaches other policies with the same insurer, in that case any other NFIP insurance. And by dating the voidance to the act rather than to the discovery, it removes coverage for losses that had nothing to do with the deception. Private policies carry their own concealment and fraud conditions and their terms vary, so the specific policy is the thing to read; what does not vary is that the condition exists and that it is a separate consequence from anything a prosecutor does.
The warning on the claim form is there because a state put it there. New York requires, by regulation at 11 NYCRR 86.4, that claim forms and applications for commercial and accident and health insurance carry a prescribed statement: "Any person who knowingly and with intent to defraud any insurance company or other person files an application for insurance or statement of claim containing any materially false information, or conceals for the purpose of misleading, information concerning any fact material thereto, commits a fraudulent insurance act, which is a crime, and shall also be subject to a civil penalty not to exceed five thousand dollars and the stated value of the claim for each such violation." A separate, longer version applies to automobile insurance and adds false theft or damage reports to law enforcement or the motor vehicle department. The sentence most people skip is the last clause of it: the civil penalty is on top of the criminal exposure, and it is measured per violation.
One arrangement is specific enough to name, and it is where honest people get into trouble. A contractor offering to "cover", "waive" or "eat" the deductible on a repair paid from insurance proceeds is not a discount. Texas addressed it in 2019 by requiring a 12-point boldface notice on any contract for goods or services of $1,000 or more that is reasonably expected to be paid from a property insurance claim, and by making it an offense, a Class B misdemeanor, for the seller to pay, waive, absorb or decline to collect the deductible without the insurer's consent, to give an offsetting rebate or credit, or "in any other manner" to assist the insured in avoiding payment of it. Two details matter for accuracy. The offense as amended is on the seller, since the insured-side offense in the previous version of that section was deleted by the same act, although a separate Texas provision requires the insured to pay the deductible. And this is Texas. Florida approaches related conduct from a different angle, prohibiting a public adjuster from offering a residential property owner a rebate, gift, gift card, cash, coupon or a waiver of any insurance deductible in exchange for allowing a roof inspection or for making a roof damage claim. What a reader elsewhere should take from this is not that the practice is illegal everywhere, which is a claim nobody can support, but that it is regulated somewhere, that the money is coming from an insurance claim either way, and that a contractor who proposes it is proposing something their own state may treat as a crime.
Reporting runs through the state. Insurance fraud is investigated by state insurance departments, which maintain their own fraud units and public reporting routes, and in serious cases by state prosecutors. Both the Texas Department of Insurance and Washington's Office of the Insurance Commissioner carry a fraud reporting channel on their own sites. Where the conduct is by a licensed producer or adjuster, the same department is also the licensing authority.