TRIA insurance refers to terrorism coverage governed by the Terrorism Risk Insurance Act, a 2002 federal law that creates a government backstop for commercial property and casualty claims tied to certified acts of terrorism. The program shares losses between private insurers and the U.S. Treasury once a certified attack causes more than $200 million in aggregate insured losses across the industry. It applies only to commercial lines, not to personal policies like homeowners or auto, and its current authorization runs through December 31, 2027.
How the Backstop Works
TRIA is not a policy the government sells. It’s a loss-sharing arrangement that activates only after a specific sequence of thresholds is met. Three pieces have to line up: certification, an industry-wide trigger, and each insurer’s own deductible.
Certification of the Event
No federal dollars move until the Secretary of the Treasury formally certifies an event as an act of terrorism, in agreement with the Secretary of Homeland Security and the Attorney General. The act must be violent, dangerous to people or property, and intended to coerce the civilian population or influence government policy. It must also cause more than $5 million in property and casualty insurance losses.1U.S. Department of the Treasury. Terrorism Risk Insurance Program
The original 2002 law limited certification to acts committed on behalf of a foreign person or interest. The 2015 reauthorization removed that restriction, so the program now reaches domestic acts of terrorism as well, provided the other criteria are met.
The Program Trigger
Even after certification, the federal backstop does not activate until industry-wide insured losses from certified acts exceed $200 million in a calendar year.2Federal Register. 2026 Terrorism Risk Insurance Program Data Call Below that number, insurers pay their claims without any federal reimbursement.
Insurer Deductibles and Federal Cost-Share
Once the $200 million trigger is crossed, each insurer still has to satisfy its own deductible before the government pays anything. That deductible equals 20% of the insurer’s direct earned premiums from the prior year in TRIA-eligible lines. Above the deductible, the federal government reimburses 80% of an insurer’s losses and the insurer pays the remaining 20%. The split continues until industry losses reach $100 billion in a calendar year. Beyond that cap, there’s no federal coverage and no further insurer obligation unless Congress acts.1U.S. Department of the Treasury. Terrorism Risk Insurance Program
What TRIA Covers
The program applies to commercial property and casualty lines: commercial property, general liability, workers’ compensation, and excess or surplus lines coverage. Covered losses from a certified attack can include damage to buildings, equipment, and inventory, plus business interruption losses and liability claims arising from the event.1U.S. Department of the Treasury. Terrorism Risk Insurance Program
Workers’ compensation follows slightly different rules. Unlike other commercial lines, workers’ comp policies generally cannot exclude terrorism as a cause of injury. If an employee is hurt or killed in a terrorist attack during the course of employment, the workers’ comp policy responds whether or not the employer bought optional terrorism coverage.
What TRIA Does Not Cover
Personal insurance sits entirely outside the program. Homeowners policies, personal auto coverage, and individual life insurance are not backstopped by TRIA. Damage to a private home from a terrorist attack falls to whatever the personal policy covers on its own.
Acts of war are excluded from most commercial policies and from TRIA itself. Workers’ compensation is the exception here too: in most states, workers’ comp responds to injuries regardless of whether the cause is classified as war or terrorism.
Nuclear, biological, chemical, and radiological attacks are a more nuanced case. TRIA itself does not exclude these events from certification, so the federal backstop can apply if the criteria are met. The complication is that many underlying commercial policies contain their own exclusions for these hazards. If the private policy doesn’t cover the loss to begin with, there’s nothing for the backstop to reimburse. Workers’ comp is less likely to carry those exclusions.
What Commercial Policyholders Should Know
The Make-Available Requirement
Every insurer writing commercial property and casualty coverage in the United States must offer terrorism insurance to its policyholders. The terms and conditions cannot differ materially from the rest of the policy, so an insurer cannot offer terrorism coverage but cap it at a small fraction of the property limit.1U.S. Department of the Treasury. Terrorism Risk Insurance Program
You are not required to buy it. Many businesses in lower-risk areas decline. But the insurer has to disclose both the availability of the coverage and the premium it would cost, and the decision to decline is worth thinking through carefully if a lender or lease requires terrorism coverage as a condition of the deal.
What It Costs
Terrorism premiums vary widely based on the property’s location, use, and perceived risk. A warehouse in a rural area costs far less to insure than an office tower in a major city. The terrorism premium is disclosed separately from other policy charges, so you can see exactly what the coverage adds. For many businesses outside major metropolitan areas, the cost is modest.
The Recoupment Surcharge
Federal payments under TRIA are not necessarily free money for the industry. After a certified event triggers the backstop, Treasury can recover some or all of its outlays through a surcharge imposed on commercial property and casualty policyholders nationwide, not just those who suffered losses.
A mandatory recoupment applies when federal payments exceed a calculated threshold tied to aggregate industry premiums. Treasury must collect 140% of the mandatory recoupment amount, and that surcharge is passed through directly to policyholders as a line item on their premium bills.3eCFR. 31 CFR 50.92 – Establishment and Publication of Federal Terrorism Policy Surcharge Even policyholders who declined terrorism coverage can be hit with the surcharge, because it applies to property and casualty policies broadly. Treasury also has discretionary authority to recoup amounts below the mandatory threshold, at a slower pace.
The 2027 Sunset
TRIA has always been a temporary program on paper. Congress has reauthorized it four times, most recently in 2019, and the current authorization expires December 31, 2027. Each renewal has shifted more financial responsibility onto private insurers through higher deductibles, larger co-pays, and a higher program trigger than the original law required.1U.S. Department of the Treasury. Terrorism Risk Insurance Program
If Congress lets the program expire, insurers will no longer be required to offer terrorism coverage on commercial policies. The likely outcome would mirror the post-9/11 market: fewer insurers offering the coverage, higher premiums where it is offered, and businesses in high-profile locations left with fewer options to manage terrorism risk.