Surplus Lines Insurance Guide: Everything Brokers Need to Know

Surplus lines insurance generated $115.4 billion in direct written premium in 2025, representing 11.2% of the total U.S. P&C market. The surplus lines market exists to cover risks that admitted carriers cannot or will not write: high-hazard operations, emerging risks like cyber liability, catastrophe-exposed coastal property, and specialty programs for niche industries. For brokers, surplus lines placement involves specific regulatory requirements including diligent search, surplus lines tax, and stamping office filings that do not apply to admitted market transactions. This surplus lines insurance guide covers the entire placement workflow from risk identification through binding and compliance.

Key Takeaways

• The U.S. surplus lines market reached $115.4 billion in direct written premium in 2025, growing 12.8% year-over-year, per WSIA 2025 Market Report
• 270+ surplus lines carriers operate in the U.S., with Lloyd's syndicates writing 24% of all surplus lines premium
• Every surplus lines placement requires a diligent search documenting that admitted carriers declined or cannot provide the coverage
• Surplus lines tax rates range from 0% (Hawaii) to 6% (Nevada), with most states between 3-5%, per NRRA tax tables
• Non-admitted carriers are not backed by state guaranty funds, making carrier financial strength evaluation a direct broker responsibility
• 46 states require surplus lines brokers to hold a specific surplus lines license separate from their standard P&C license

How the Surplus Lines Market Works

The surplus lines market operates as a parallel insurance system alongside the admitted (standard) market. Admitted carriers file their rates and forms with state DOIs and participate in state guaranty funds. Non-admitted (surplus lines) carriers operate with rate and form flexibility, setting their own pricing and coverage terms without state rate approval.

This flexibility is the point. Risks that admitted carriers cannot price within their filed rate structures move to the surplus lines market where carriers can price each risk individually.

Market structure:

The surplus lines distribution chain has three tiers.

1. Retail broker/agent (insurance producer): The broker who represents the client. If the risk cannot be placed in the admitted market, the retail broker works with a surplus lines broker.

2. Surplus lines broker (wholesale): Licensed to place business with non-admitted carriers. The surplus lines broker accesses markets the retail broker cannot reach directly. In most states, only a licensed surplus lines broker can bind coverage with a non-admitted carrier.

3. Non-admitted carrier: The insurance company that underwrites and issues the policy. Examples include Lloyd's of London syndicates, Lexington Insurance (AIG), Scottsdale Insurance (Nationwide), Nautilus Insurance (Berkley), and Markel.

The Diligent Search Requirement

Before placing any risk in the surplus lines market, the broker must document that the admitted market cannot accommodate the risk. This documentation is called a diligent search.

What the diligent search involves. The broker must approach a minimum number of admitted carriers (typically 3-5, depending on the state) and document their declinations. Each declination must be genuine. A carrier declining because the broker did not submit complete information does not count.

State variations. Requirements differ by state:

• Florida requires three admitted carrier declinations
• New York requires documentation that coverage is not available in the admitted market but does not specify a minimum number
• Texas requires a diligent effort to obtain coverage from admitted carriers
• California requires a diligent search with specific documentation of each admitted market approach

Exempt commercial purchaser exception. The Nonadmitted and Reinsurance Reform Act (NRRA) of 2010 created an exemption for sophisticated commercial buyers. Companies meeting specific criteria (net worth over $20M, revenue over $50M, or 500+ employees) can waive the diligent search requirement. This exemption applies in all states but the qualifying criteria are strict.

Documentation. Maintain a diligent search record for every surplus lines placement. Record the admitted carrier name, date of approach, coverage requested, and reason for declination. Retain this documentation for the policy period plus the applicable statute of limitations (typically 3-6 years depending on state).

Surplus Lines Tax and Compliance

Every surplus lines transaction triggers tax obligations. The surplus lines broker (not the retail broker) is responsible for collecting and remitting surplus lines tax to the state.

Tax calculation. Surplus lines tax applies to the total premium. Rates vary by state:

NRRA tax allocation. For multi-state risks (a policy covering operations in multiple states), the NRRA simplified tax allocation. Tax is due to the insured's home state, not to every state where the risk is located. This eliminated the complex multi-state tax allocation that existed before 2011.

Stamping office filings. Fifteen states require surplus lines transactions to be filed with a stamping office, which reviews each transaction for compliance. The stamping office verifies the carrier's eligibility, checks that the surplus lines tax is calculated correctly, and confirms the diligent search documentation exists.

Evaluating Non-Admitted Carriers

Non-admitted carriers do not participate in state guaranty funds. If a non-admitted carrier becomes insolvent, policyholders have no state-backed recovery mechanism. This makes carrier financial strength evaluation a direct broker responsibility.

AM Best ratings. AM Best rates insurance carriers on financial strength. For non-admitted carriers, an A- (Excellent) or better rating is the industry standard. Most state eligible surplus lines carrier lists require a minimum AM Best rating (typically B++ or better).

Key financial metrics:

• Policyholder surplus (the carrier's net worth available to pay claims)
• Combined ratio (loss ratio + expense ratio; below 100% indicates underwriting profit)
• Reserve adequacy (are loss reserves sufficient for outstanding claims?)
• Premium-to-surplus ratio (how much premium the carrier writes relative to its surplus)

Lloyd's syndicates carry a collective AM Best rating of A (Excellent). Individual syndicates vary in specialty and capacity, but the Lloyd's Central Fund provides an additional layer of security for policyholders.

Placement Process Step by Step

1. Risk assessment. Evaluate the client's risk. Identify the coverage needs, limits, and any unique characteristics that make admitted market placement difficult.

2. Admitted market approach. Conduct the diligent search. Approach the required number of admitted carriers. Document declinations with carrier name, date, and reason.

3. Surplus lines market submission. Prepare the submission for surplus lines carriers through your wholesale broker. Include complete underwriting information: applications, loss runs (5 years minimum), financial statements (for large accounts), and specific risk details.

4. Quote comparison. Evaluate quotes from surplus lines carriers on coverage terms, pricing, carrier financial strength, and claims handling reputation. Surplus lines quotes have more variability than admitted market quotes because carriers customize terms.

5. Client disclosure. Most states require a written disclosure to the insured that the policy is being placed with a non-admitted carrier not backed by the state guaranty fund. The insured must acknowledge this disclosure before binding.

6. Binding. The surplus lines broker binds coverage with the selected carrier. The wholesale broker issues the binder.

7. Surplus lines tax and filing. The surplus lines broker calculates and collects the surplus lines tax, files the transaction with the applicable stamping office (in states that require it), and remits the tax to the state on the required schedule.

8. Policy issuance. The carrier issues the policy. The surplus lines broker reviews it for accuracy and forwards it through the distribution chain to the retail broker and insured.

Building Wholesale Broker Relationships That Improve Placement Results

Your wholesale broker relationships are among the most important assets in your surplus lines practice. The quality of those relationships directly affects how quickly you get quotes, how favorable the terms are, and whether underwriters make exceptions for borderline submissions.

Three behaviors build strong wholesale relationships over time:

Submit complete, organized packages. Wholesale brokers measure retail agencies by the quality of their submissions. Agencies that send complete ACORD applications, current loss runs, and supporting documentation get faster quotes and better terms. Agencies that send incomplete submissions get put in a lower-priority queue. The difference in turnaround time can be 3-5 days on the same risk.

Provide honest account characterization. Surplus lines underwriters are sophisticated. They have seen every variation of every risk class. Brokers who present accounts accurately, including adverse loss history and operational challenges, earn trust. Brokers who spin unfavorable accounts get caught when underwriters pull public data and find discrepancies. The trust relationship, once damaged, affects every future submission.

Communicate bind/no-bind decisions promptly. When you receive a quote and decide not to bind with that carrier, let the wholesale broker know immediately. Underwriters hold capacity for accounts they have quoted. Holding capacity that is never bound damages your agency's standing with the market. A quick email saying "client went elsewhere, releasing this account" takes 60 seconds and maintains the relationship.

FAQ

What are surplus lines in insurance?

Surplus lines insurance covers risks that admitted (standard market) carriers decline or cannot write within their filed rates and forms. The surplus lines market provides rate and form flexibility, allowing carriers to price and structure coverage for high-hazard, emerging, or specialty risks. The U.S. surplus lines market wrote $115.4 billion in premium in 2025.

What are surplus lines insurance policies?

Surplus lines insurance policies are issued by non-admitted carriers that are not licensed in the insured's state but are authorized to write surplus lines business. These carriers can set their own rates and design custom policy forms. Unlike admitted carriers, surplus lines carriers do not participate in state guaranty funds.

What are excess and surplus lines of insurance?

Excess and surplus lines (E&S) is the collective term for the non-admitted insurance market. "Excess" refers to coverage above standard market limits. "Surplus" refers to coverage for risks the standard market cannot or will not write. Together, E&S represents 11.2% of the total U.S. P&C market and serves as the safety valve that maintains coverage availability for all insurable risks.

What does surplus lines mean in insurance?

Surplus lines means the insurance is placed with a non-admitted carrier because the admitted market cannot provide the needed coverage. The term originates from the concept that the admitted market's capacity is "exhausted" and the excess (surplus) capacity is needed. Surplus lines placement requires specific regulatory compliance including diligent search and surplus lines tax.

What does surplus lines insurance mean for policyholders?

Surplus lines insurance means the policyholder's coverage is underwritten by a non-admitted carrier. This has three practical implications: the carrier sets its own rates (no state rate approval), the policy forms may differ from standard admitted market forms, and the state guaranty fund does not protect the policyholder if the carrier fails. Surplus lines premiums are typically 15-40% higher than admitted market premiums for comparable risks.

What is a surplus lines insurance policy?

A surplus lines insurance policy provides coverage through the non-admitted market for risks declined by admitted carriers. Common surplus lines placements include coastal property in catastrophe zones, cyber liability for technology companies, environmental liability, special events, and professional liability for high-risk professions. The coverage is regulated but through a different framework than admitted insurance.

Written by Javier Sanz, Founder of BrokerageAudit. Last updated April 2026.

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