Idaho Surplus Lines Tax: Rates, Filing Deadlines, and Penalties

The Idaho surplus lines tax is 1.5 percent of the gross premium, paid to the Idaho Department of Insurance, plus a 0.5 percent stamping fee collected by the Surplus Line Association of Idaho. Brokers file each policy with the association within 30 days of receiving it and submit an annual Statement of Premium Taxes to the Department of Insurance by March 1. Miss either deadline and the penalties stack fast.

How the Rate and Fee Work

Idaho Code § 41-1229 sets the premium tax at 1.5 percent of the gross premium charged for the policy. Gross premium means the total amount paid, minus any sums collected to cover federal or state taxes and examination fees.¹ Everything else bundled into the premium counts toward the taxable base.

The Surplus Line Association of Idaho adds a 0.5 percent stamping fee on the taxable premium for reviewing each transaction.² A policy with a $100,000 taxable premium produces $1,500 in state tax and $500 in stamping fees, for $2,000 total. The state tax goes to the Department of Insurance; the stamping fee goes to the association.

Filing Each Policy Within 30 Days

Brokers must submit an electronic filing with the Surplus Line Association within 30 days of receiving each surplus lines policy.² This runs per policy, not in quarterly batches. Filings go through the Idaho SLA Broker Portal.

Each filing includes the full legal name of the insured, the broker’s license number, the policy number, the effective date, the type of coverage, and the gross premium. The portal calculates the state tax and stamping fee from the premium entered. Matching those numbers exactly to the insurer’s declarations page prevents discrepancies that get flagged during review.

The Annual Statement of Premium Taxes

Separate from the per-policy filings, every Idaho surplus lines broker must file an annual Statement of Premium Taxes with the Department of Insurance on or before March 1, covering all surplus lines business transacted during the preceding calendar year. The full premium tax payment accompanies the filing.¹

Even brokers who wrote no surplus lines business during the year must still file a return showing $0 in premiums. The Department of Insurance requires electronic filing for all tax and fee submissions. Returns that are incomplete, unsigned, or submitted on outdated forms get rejected and treated as unfiled until corrected.³

Mid-Term Cancellations and Endorsements

When a policy is canceled or amended mid-term in a way that changes the premium, the broker files an amended report with the association. For return-premium endorsements or flat cancellations, a copy of the endorsement must be uploaded to the Idaho SLA Broker Portal within 30 days of the broker receiving it. Filings submitted after the 30-day window incur a $25 late filing fee.²

The stamping fee is treated as fully earned once the original policy is filed. The association refunds the stamping fee only if the policy is canceled flat, meaning voided entirely as though it never existed. Partial cancellations or mid-term reductions do not generate a stamping fee refund, even when the premium drops significantly.

What Late Filing Actually Costs

Idaho’s penalty structure hits from multiple angles, and brokers who fall behind can rack up charges quickly.

Late annual premium tax return: the Department of Insurance assesses a $25-per-day penalty starting April 2 for any broker who misses the March 1 deadline. This applies to both late payments and late reports, including zero-premium returns.³
Late policy filings: a $25 fee for any policy, audit, or endorsement filed more than 30 days after the broker receives the documentation.²
Late invoice payment: a $25-per-month fee for any association invoice paid even one day past its due date, recurring every 31 days until paid.
Unfixed flagged filings: if the association flags a filing for errors and the broker doesn’t correct and resubmit within 10 days, a $10 weekly fee begins accruing.

The daily penalty on the annual return is the one that catches brokers off guard. A broker who forgets to file a zero-premium return and doesn’t notice until June is looking at roughly $2,275 in penalties for a filing that reported no tax owed. Filing on time, even with nothing to report, is the easiest money to save.

Multi-State Policies and the Home State Rule

When a surplus lines policy covers risks in more than one state, Idaho only collects the premium tax and stamping fee if Idaho is the insured’s home state. The federal Nonadmitted and Reinsurance Reform Act gave the home state exclusive authority to tax surplus lines premiums, replacing the old system where multiple states could each demand a share.⁴

Idaho defines home state as the state where the insured maintains its principal place of business, or for individuals, their principal residence. If 100 percent of the risk sits outside that state, the home state becomes whichever state receives the largest share of the premium allocation.⁵ If Idaho is not the home state, the broker owes Idaho nothing on that policy.²

Coverage Bought Without a Broker

When a business or individual buys coverage directly from a non-admitted carrier without going through a surplus lines broker, the policy is classified as independently procured, and the tax obligation does not disappear. The insured is personally responsible for filing a written report with the Surplus Line Association and paying the premium tax to the Department of Insurance within 30 days of receiving, continuing, or renewing the policy. A stamping fee is owed to the association at the same time.⁶ The rate is the same 1.5 percent that applies to broker-placed policies.¹ Life and disability insurance are excluded from the independently procured coverage requirements.

1
Idaho State Legislature. Idaho Code 41-1229 – Tax on Surplus Lines
2
Surplus Line Association of Idaho. FAQ and Resources
3
Idaho Department of Insurance. Instructions for Completing and Filing Statement of Premium Taxes
4
Office of the Law Revision Counsel. 15 USC 8206 – Definitions
5
Idaho State Legislature. Idaho Code 41-1213 – Definitions
6
Idaho State Legislature. Idaho Code 41-1233 – Report and Tax of Independently Procured Coverages