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Stacked vs. unstacked UM in Florida: uninsured motorist coverage explained

Miami-Dade has a high share of uninsured and underinsured drivers. Uninsured motorist coverage — UM — pays you when they cannot. Florida lets you stack it across cars or buy it unstacked. The rejection box on the application is the most expensive initials people scribble.

September 8, 2026 · 6 min read · Miami-Dade & Florida

UM pays you. Liability pays them.

Bodily injury liability defends you if you hurt someone. UM (and underinsured motorist, often combined) pays your injuries when the other driver has no insurance, too little, or hits and runs — subject to the policy. In a no-fault state people assume PIP is enough. PIP is $10,000. A Kendall ER and follow-up can eat it.

UM is first-party. You are the claimant. Stacking and limits decide how much room you have after PIP.

Stacked vs. unstacked, without the brochure

Unstacked UM gives you the limit on the vehicle you were in (or your policy’s UM if you were a pedestrian, depending on the form). Stacked UM adds the UM limits from other vehicles on the same policy. Two cars with $100,000 stacked UM can become $200,000 of UM for a claim. Premium is higher. In a two- and three-car Palmetto Bay household, stacking is often the cleaner way to buy a real limit.

One-car Doral files may not gain from stacking. We quote both. You pick.

The rejection form is not decoration

Florida requires a signed UM selection or rejection. Rejecting UM to save $8 a month is how a hit-and-run on 136th Street becomes a credit-card and lawsuit story. If you already rejected it, you can add it at renewal or mid-term, subject to underwriting.

Non-stacked $25,000 UM next to $100,000 bodily injury is a mismatch. We match UM to BI when the market allows.

What we quote from this desk

Household vehicles, who drives, and whether anyone rejected UM last year. Start an auto quote. The Palmetto conversation is the limit you would actually want to live on, not the cheapest box.

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Same desk that wrote the guide. Auto and home quote online. Other lines, an advisor.

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