Rental reimbursement coverage in Massachusetts is Part 10, not Part 8, and fault decides who pays.

Rental reimbursement in Massachusetts: Part 10, not Part 8

Massachusetts DOI consumer guidance describes rental reimbursement as coverage for substitute transportation, such as a rental car, while your vehicle is being repaired from a collision or comprehensive claim. That’s the plain-English version. The policy-language version, from the Mass.gov auto-claims FAQ, is more specific: it names this optional coverage Part 10 (Substitute Transportation) available through your personal auto insurance carrier, and it’s a coverage you can claim against if you’re the one at fault for the accident.

Here’s where the common mix-up comes from. The Commonwealth Automobile Reinsurers rating manual, under Rule 16, groups Parts 7, 8, and 9 together as “DEDUCTIBLES – PARTS 7, 8 and 9,” tied to Collision, Limited Collision, and Comprehensive Coverages, including Fire, Theft, and Combined Additional Coverages. Part 8 in that grouping is Limited Collision, not rental reimbursement. Substitute transportation lives in its own section, Rule 17, entirely separate from the Part 7/8/9 collision family. If an agent, a forum post, or an old policy summary calls rental reimbursement “Part 8,” that’s simply wrong under the current CAR manual and the state’s own FAQ.

Why people call it Part 8, and what Parts 7, 8, and 9 actually cover

Understanding the Part 7/8/9 grouping helps explain the confusion. Rule 16 covers deductibles for three closely related physical damage coverages on your car: Collision, Limited Collision, and Comprehensive, the latter of which folds in fire, theft, and combined additional coverages. Higher-than-standard deductibles are separately available for all three of those parts under Rule 16. Because Part 8, Limited Collision, deals with vehicle damage the same way Collision and Comprehensive do, and because rental reimbursement is often purchased alongside those coverages, it’s easy to see how the numbering gets conflated in casual conversation.

But the CAR manual treats them as distinct rules for a reason. Rule 17, Substitute Transportation, is priced and structured separately from the Part 7/8/9 deductible rule. If you want a full rundown of the optional coverages on a Massachusetts policy and how each one fits together, the guide on optional Massachusetts auto insurance coverages walks through the full lineup so you can see where Part 10 sits relative to the others.

How a claim actually pays out: fault, daily limits, and comparable vehicles

Fault is the first branch point. If you’re found not at fault in an accident, Mass.gov’s FAQ directs you to open a third-party claim against the at-fault driver’s policy under Part 4, Damage to Someone Else’s Property, rather than tapping your own rental coverage. If you’re at fault and you purchased Part 10, you may open a claim with your own policy for substitute transportation.

Even when Part 10 applies, the payout has real limits. The FAQ states plainly that the selected daily limit is the most your carrier will pay per day, and that limit is a level you chose when you bought the coverage, referenced on your policy’s selections page. There’s no statewide standard daily cap; it’s whatever you selected. Just as important, Massachusetts insurers are not required to provide a substitute vehicle that’s comparable to your own car. A driver with a mid-size sedan shouldn’t assume the rental will be another mid-size sedan; what shows up depends on the daily limit and the rental company’s inventory.

When the rental payments stop

The most common surprise with Part 10 involves total losses. Once your insurer makes a settlement offer for a total loss, it may stop paying for the rental car, even while you’re still negotiating a higher actual cash value figure. The FAQ is direct on this point: the insurer is not obligated to continue to pay for the rental car following an offer to settle your claim. In practice, insurers typically notify you a few days in advance of the cutoff date so you aren’t caught off guard, but the exact terms of when coverage ends are policy-specific and spelled out in the “Substitute Transportation” section of your own policy, not in a universal state rule. If you’re heading toward a total-loss determination, read that section before you assume the rental keeps rolling through negotiations; the guide on how Massachusetts insurers value a total loss covers the settlement process that triggers this cutoff.

What to check before you sign a rental agreement

Whether you get a rental at all, and on what terms, depends on the agreement you sign with the rental car company as well as the language in your own policy. The state’s guidance specifically advises talking to your insurer before signing a rental agreement, since the two documents interact in ways that aren’t always obvious at the counter. There’s also a secondary layer worth checking: your credit card might offer some insurance coverage for rental cars if you use that card to pay for the rental, separate from anything Part 10 provides. Before you sign anything at the rental counter, review what your policy already covers; the guide on rental car insurance in Massachusetts breaks down what protection you may already have.

How Part 10 is priced, and your right to see the options

Under CAR’s Rule 17, the charges for substitute transportation are set on a per vehicle, per year basis, meaning the premium is fixed annually per car rather than assessed per claim. The applicable limits and premiums for the coverage are laid out on the manual’s Miscellaneous Rating Factors page rather than within Rule 17 itself, so the exact cost depends on the limit tier you choose and your carrier’s rate filing.

You also have a formal right to understand these choices. Under the Massachusetts Consumer Bill of Rights for Automobile Insurance, agents, brokers, and companies must inform you in simple language of your coverage options when you apply for a policy, or at any time upon your request if you already hold one. That includes the right to know how each optional coverage, Part 10 among them, affects your premium and what your coverage would look like in the event of an accident. Not all Massachusetts auto coverage is mandatory, but as the state’s own guidance puts it, that doesn’t necessarily mean you don’t need it. This is separate from the compulsory minimum increases that took effect July 1, 2025, which affected mandatory bodily injury and property damage limits, not optional Part 10. For a broader look at how the compulsory and optional layers fit together, see how car insurance works in Massachusetts.

Rental reimbursement vs. other optional coverages you might be bundling

Part 10 often gets bundled or confused with other optional add-ons at renewal. Towing and labor coverage for when your car breaks down is a separate optional line from substitute transportation. Accident forgiveness is listed as its own distinct optional coverage in the same state consumer overview. Roadside assistance is likewise its own separate line item. None of these three automatically includes rental reimbursement, and Part 10 doesn’t include any of them. If you’re deciding what to add at your next renewal, evaluate each one on its own terms rather than assuming one covers the others.