A self-insured retention is the dollar amount the insured must pay on a covered loss before the policy obligates the insurer to respond. Unlike a deductible, which the insurer typically fronts and bills back, an SIR leaves the first layer of each claim, often including defense costs, entirely in the insured's hands.
Brokers run into SIRs in two places: commercial umbrella forms, where the SIR is a defined term on the declarations, and large-account casualty programs, where carriers use retentions instead of deductibles on the primary layer.
Self-Insured Retention
The dollar amount stated in the declarations that the insured must pay before the insurance applies, with the insurer's coverage and typically its defense obligation sitting above that amount.
How is an SIR different from a deductible?
The money can look identical on a proposal, but the mechanics differ on every claim. With a deductible, the insurer handles the loss from dollar one, pays it, then collects the deductible back from the insured. The insurer controls defense and settlement throughout, and on liability forms the deductible often erodes nothing but the insured's wallet.
With an SIR, the insured pays first. The insured funds the retention, frequently including defense costs within it, and the insurer's limit sits above the retention rather than being reduced by it. The practical consequences matter to your client: under an SIR the insured usually must manage or fund its own defense inside the retention, prove the retention has been exhausted with actual payments, and carry the credit risk of its own claim handling.
Carriers also care about collectability. An insured that cannot fund a $250,000 SIR mid-claim becomes the insurer's problem, which is why underwriters ask for financials before granting one.
How does the SIR work on a commercial umbrella?
The Commercial Liability Umbrella form CU 00 01 04 13 defines self-insured retention as the amount listed in the declarations that the insured pays before the umbrella applies, but only for occurrences or offenses not covered by the underlying insurance. When the umbrella is broader than the underlying policies, it drops down and becomes primary for that loss, subject to the SIR.
The SIR does not apply when the umbrella pays excess of an exhausted underlying aggregate limit, because that loss was covered by underlying insurance. Sizing matters when you place the account: a $10,000 SIR on a drop-down claim is a nuisance, a $100,000 SIR is a balance sheet event.
What should you check before recommending an SIR program?
Read the retention wording, not just the number. Confirm whether defense costs erode the SIR, whether the insurer has any duty to defend within it, and what proof of payment the carrier requires before its layer attaches. Adjusters on SIR programs routinely ask for paid loss documentation, not reserves, before contributing a dollar.
Then match the retention to the client's loss runs and cash flow. A retention that saves 15% of premium but sits below the client's working layer of claims just converts insurance into a payment plan with extra administration.
Frequently asked questions
Is an SIR the same as a deductible?
No. With a deductible the insurer pays the claim from the first dollar and recovers the deductible from the insured. With an SIR the insured pays first, often including defense costs, and the insurer's coverage and defense duty attach only above the retention.
Does an SIR reduce the policy limit?
Typically no. The limit sits above the retention, so a $1,000,000 policy over a $100,000 SIR can pay a full $1,000,000. Liability deductibles, by contrast, sometimes reduce the limit depending on the endorsement wording, so read the form.
Who defends a claim inside the SIR?
Usually the insured. Most SIR wording gives the insurer no duty to defend until the retention is exhausted, so the insured hires counsel and pays defense costs within the retention. Some forms let the insurer participate earlier at its own option.
Why do umbrellas have an SIR at all?
The SIR only applies when the umbrella is broader than the underlying policies and drops down to pay as primary. It keeps the insured responsible for a first layer on losses no underlying insurer covered, and it never applies when underlying limits are simply exhausted.
This definition is for educational purposes. Your policy's specific terms, conditions, and endorsements control. Talk to a licensed broker about your actual exposures.