Self-Insured Retention (SIR): The Umbrella Deductible, Explained

A self-insured retention (SIR) is the slice of a claim you pay yourself — commonly $500 to $2,500 on Canadian personal umbrella policies, though some wordings run higher — before the umbrella starts paying. And it applies in exactly one situation: when the umbrella responds to a claim that none of your underlying policies cover at all. In the ordinary umbrella claim — a car-crash judgment that blows past your $1 million auto limit — you pay nothing at the umbrella layer, because your auto policy's limit is already doing the retention's job.

That's the whole concept in two sentences. The rest of this page is why the SIR exists, how it differs from the deductible you already know, and why a $1,000 or $2,500 retention should not scare you off a policy that costs about $200–$300 a year for its first $1 million of protection (an estimate from typical Canadian broker pricing, not a quote).

What an SIR actually is#

An umbrella policy normally works as a second storey: your auto or home policy pays its full limit first, and the umbrella pays above it. In that arrangement there's nothing for you to pay — one insurer hands off to the next.

But a true umbrella can do something a plain excess policy can't: drop down and act like a primary policy when a claim falls inside the umbrella's own broader wording but outside every policy beneath it. In that situation there is no underlying insurer paying the first layer. So the wording substitutes a small one: you. You cover the first $500, $1,000, or $2,500 — the SIR — and the umbrella responds above it.

Think of the SIR as the answer to a fair question from the insurer: "If no other policy is paying first, who is?" The answer is you, but only up to a number small enough to fit on a credit card — not the $1 million a missing underlying policy would otherwise leave on your plate.

Deductible vs. SIR: same haircut, different barber#

The two get used interchangeably in casual conversation, and for a personal policy the day-to-day difference is modest. But they are mechanically different things:

The row that matters most is the third one. A home-policy deductible touches you on almost every property claim. An umbrella SIR touches you almost never — because the claims that trigger it are, by design, the rare ones.

The one time you actually pay it: the drop-down claim#

Here's what a drop-down claim looks like in real life:

• A defamation lawsuit. Someone sues you over a scathing Google review or a Facebook post. Your home policy covers bodily injury and property damage — a reputation is neither — so it pays $0. If your umbrella includes personal injury coverage (defamation, libel, slander — typically with a knowing-falsehood exclusion), it drops down and responds as if it were primary. You pay the SIR; the umbrella handles the rest.
• An incident outside your underlying policy's territory. Your auto policy stops at the Canada–U.S. border. A true umbrella with worldwide territory may respond to the claim from the moped in Portugal that no underlying policy touches.
• An underlying insurer that can't pay. Some wordings drop down if your underlying insurer becomes insolvent, or if an underlying aggregate limit has been exhausted by earlier claims. This varies a lot between policies — ask your broker whether yours does.

Notice the pattern: every one of these is a claim where, without the umbrella, you'd be paying the entire thing yourself. The SIR isn't the cost of the coverage. It's the toll booth on a road you'd otherwise have to build alone.

The times you never pay it — which is most of the time#

Now the ordinary claim, the one umbrella policies exist for. A court awards $2.5 million against you after a serious car crash. Your auto policy pays its $1 million limit. Your umbrella pays the next $1.5 million. Your SIR payment: zero.

Why? Because in an excess claim, the industry treats your underlying limit as the retention. Your auto insurer's $1 million is the "deductible" — it just happens to be a deductible someone else pays. The SIR only wakes up when that first payer doesn't exist.

This is also why pure follow-form excess policies usually have no SIR at all. A follow-form policy adopts the underlying policy's terms wholesale — covered below, covered above; excluded below, excluded above. It never drops down, so there's never a claim without an underlying insurer in front of it, so there's nothing for a retention to do. If you spot an SIR in your wording, that's usually good news: it means the policy has at least some true umbrella behaviour. (The umbrella-vs-excess distinction is its own topic, and most Canadian "umbrellas" are somewhere in between.)

How big is a personal SIR in Canada?#

Commonly $500 to $2,500 — small on purpose. Some Canadian wordings use $5,000 or even $10,000, which changes the math: a $10,000 retention makes the drop-down feature meaningfully less usable for a family than a $1,000 one, even though the policies look identical on the cover page. The number is printed in your declarations. Look it up, or ask.

For contrast: commercial umbrella and excess programs use SIRs of $25,000 to $1 million or more, because businesses can absorb and administer claims that size. Nothing about that world applies to you — if a broker quotes personal coverage with a commercial-sized retention, ask why.

Why insurers bother with a retention at all#

Three honest reasons:

1. They collected no underlying premium for the drop-down exposures. Your auto insurer priced the driving risk; nobody beneath the umbrella priced your defamation risk. The SIR is part of how the umbrella insurer keeps that broader promise affordable.
2. It filters out small claims. Without a retention, an umbrella with drop-down coverage would become a first-dollar policy for every minor personal-injury allegation. The SIR keeps the policy doing its actual job: catastrophic protection.
3. It keeps the price where it is. Roughly $200–$300 a year for the first $1 million and $50–$75 for each additional million (estimates, not quotes) is only possible because you're sharing the first sliver of the rare claims.

A retention you'll probably never pay, in exchange for millions of coverage at streaming-bill prices, is a trade worth taking every time.

Three questions for your broker#

1. "What's the SIR, exactly?" It's one number in the declarations. $1,000 is friendly; $10,000 deserves a conversation.
2. "Does this policy drop down at all?" If it's pure follow-form, the SIR question is academic — and you should know that before you need the broader coverage.
3. "Are defence costs subject to the retention?" Under many wordings the insurer defends a drop-down claim while you're only on the hook for the SIR itself — but treatment varies, and this is precisely the kind of detail brokers can confirm from the wording in minutes.

The SIR is the least scary "deductible" in insurance: small, rare, and attached to coverage you'd otherwise not have at all. The bigger question isn't the retention — it's whether your total limits match what a Canadian court could actually award against you.