In Depth
A self-insured retention is the first layer of loss the insured agrees to absorb before the insurer has any obligation on a claim. Set the SIR higher and you retain more risk, which lowers your premium. Set it lower and you hand more of the risk to the insurer, which raises the premium. It is a straightforward trade of cash now against cash at claim time.
The difference from a deductible is technical but real, and it shows up most in how a claim is handled. With a deductible, the insurer usually administers and pays the whole claim, then bills the insured back for the deductible portion, so the carrier is in charge from the first dollar. With an SIR, the insured handles and funds the claim up to the retention amount, and the policy only engages once spending crosses it. That often puts the SIR layer, including early defense decisions, in the insured's hands before the insurer's duty to defend kicks in. The two labels get used loosely in conversation, but the mechanics are not the same.
Choosing the SIR comes down to loss tolerance and available cash. A retention you can comfortably fund on the claims you actually expect is efficient, because you are not paying the insurer to handle small, predictable losses. A retention set too high for your cash position is a trap: the coverage looks cheap until a claim arrives and you cannot fund your way up to the point where the policy responds.
What It Looks Like
Say a policy carries a $50,000 SIR (illustrative). A claim comes in and resolves for $300,000. The insured funds the first $50,000, including the early legal and investigation costs inside that layer, and the policy responds to the remaining $250,000 up to its limits.
Now compare two versions of the same buyer. One picks a $25,000 SIR and pays a higher premium. The other picks a $100,000 SIR and pays less. In a quiet year with no claims, the second buyer comes out ahead on cash. In a year with three claims that each pierce the retention, the second buyer funds $300,000 of retentions before coverage does much at all. The cheaper policy was only cheaper until the claims showed up.
Why It Matters For AI Vendors
The SIR is one of the few coverage terms a buyer sets deliberately, and it is easy to treat it as a knob for shrinking the premium. The better way to think about it is capacity: pick the layer you can reliably self-fund across the realistic range of claims, given your cash position, rather than the one that makes the quote look smallest. The retention you can actually pay during a bad quarter is the one that keeps the coverage real.