Washington's UIM written-rejection rule, explained

Quick answer. Under Washington law (RCW 48.22.030), underinsured motorist (UIM) coverage generally must be provided on an auto policy unless the named insured rejects it in writing. A companion regulation, WAC 284-20-300, prescribes specific bold acknowledgment language that must appear directly above the signature line on that rejection. If an insurer cannot produce a properly signed rejection, the coverage is generally treated as included at the policy's liability limits. This is a general overview, not legal advice.

What RCW 48.22.030 requires

Washington's insurance code, at RCW 48.22.030, addresses underinsured motorist coverage on auto policies issued in the state. In general terms, UIM coverage is meant to be part of the policy by default, providing it unless the named insured affirmatively declines it. The statute's exact text, definitions, and any exceptions control over any summary here. The current version is published by the Washington State Legislature.

Why the acknowledgment language in WAC 284-20-300 matters

A separate insurance regulation, WAC 284-20-300, gets specific about how a valid rejection has to look. It prescribes bold, conspicuous acknowledgment language that must sit directly above the line where the policyholder signs, language designed so a rejection can't be buried in fine print or mixed in with unrelated paperwork. The idea behind that formatting requirement is straightforward: a policyholder giving up UIM coverage should be doing so with clear notice of what they are declining, not signing something general that happens to include a coverage waiver.

Because the regulation is specific about form as well as substance, a rejection that does not follow the prescribed format is more likely to be questioned. The current regulatory text is published by the Washington State Legislature's WAC site and is the definitive source for the exact required language.

What happens if the insurer can't produce a signed rejection

If a dispute arises over whether UIM coverage applies, and the insurer is unable to produce a rejection that was properly signed under WAC 284-20-300, the coverage is generally treated as included in the policy, commonly at the same limits as the policy's liability coverage. As with Nevada's parallel rule, the resolution turns on documentation the insurer is expected to keep, not on what either side remembers about a conversation at the time the policy was issued.

The rejection generally attaches to the original policy, not each renewal

One detail that is easy to miss: the written-rejection requirement is generally tied to when a policy is originally issued, not to every subsequent renewal. In practice, this means a rejection signed years ago when a policy was first written can still govern coverage today, even though the policyholder has renewed many times since without seeing that paperwork again. Whether a specific renewal changed the coverage depends on that policy's actual history, which is again something the paperwork, not memory, resolves.

Why this is worth confirming before it matters

Because UIM coverage can be the primary source of meaningful compensation when an at-fault driver's own insurance is inadequate, confirming what a policy actually includes, and whether any rejection on file was properly executed, is worth doing before an accident forces the question. What UM/UIM coverage is and why it matters explains what the coverage is designed to do, and Nevada's version of this same written- rejection framework is covered in Nevada's UM/UIM written-rejection rule.

Frequently asked questions

Is UIM coverage automatic on a Washington auto policy? Washington law generally requires UIM coverage to be provided unless the named insured rejects it in writing. The specifics depend on what the policy's issuance paperwork actually shows.

What does WAC 284-20-300 require the rejection form to say? WAC 284-20-300 prescribes specific bold acknowledgment language that must appear directly above the signature line on a UIM rejection, so a policyholder cannot later say the rejection was buried or unclear. The regulation's text is the definitive source for the exact wording.

Does the written-rejection requirement apply every time I renew my policy? Generally, the written-rejection requirement attaches to the original issuance of the policy, not to each renewal. Whether a particular renewal changed anything depends on the specific policy history and any changes in coverage.

This article is general information about a Washington statute and regulation, not legal advice, and it does not cover every situation or policy. No attorney-client relationship is formed until a signed agreement, and results vary by case. A licensed Washington attorney can advise on the facts of a specific policy or claim.