Massachusetts Comparative Negligence: The 51 Percent Rule Explained
One of the most important concepts in Massachusetts personal injury law is comparative negligence. If the other side argues you were partially at fault for your injuries, comparative negligence determines whether you can still recover compensation and how much your recovery will be reduced.
Massachusetts follows what is known as a modified comparative negligence rule with a 51% bar. Understanding how this rule works is critical to evaluating the strength of your personal injury claim and anticipating how the insurance company will approach your case.
How Comparative Negligence Works in Massachusetts
Under M.G.L. c. 231, Section 85, Massachusetts uses a modified comparative negligence system with two key rules:
- Your recovery is reduced by your percentage of fault. If a jury finds that your total damages are $200,000 but you were 25% at fault, your recovery is reduced to $150,000.
- If you are 51% or more at fault, you recover nothing. This is the “51% bar.” If the jury finds you were more at fault than the defendant, your claim is completely barred.
This system creates a clear threshold. You can be partially at fault and still recover, but you cannot be mostly at fault.
Practical Examples
Here is how comparative negligence plays out in common scenarios:
| Scenario | Your Fault | Total Damages | Your Recovery |
|---|---|---|---|
| Rear-ended at a red light | 0% | $100,000 | $100,000 |
| T-bone collision where you entered intersection without fully stopping | 20% | $100,000 | $80,000 |
| Slip and fall where you were looking at your phone | 40% | $100,000 | $60,000 |
| Multi-car collision where you were speeding | 50% | $100,000 | $50,000 |
| Collision where you ran a yellow light | 51% | $100,000 | $0 (barred) |
The difference between 50% fault and 51% fault is the difference between recovering $50,000 and recovering nothing. This is why the fault determination is often the most contested issue in a Massachusetts personal injury case.
How Fault Percentages Are Determined
Fault percentages are not arbitrary. They are based on the evidence in the case:
During settlement negotiations, your attorney and the insurance adjuster argue over fault percentages based on the police report, witness statements, photographs, medical records, and any available video footage. The adjuster will try to assign as much fault to you as possible to reduce the claim value.
At trial, the jury reviews all the evidence and assigns a specific fault percentage to each party. The judge then applies the comparative negligence reduction to the verdict. If the jury assigns 51% or more fault to the plaintiff, the judge enters a verdict for the defense.
Evidence that commonly affects fault determinations includes:
- Police reports and citations: A citation issued to the other driver is strong evidence of fault. Conversely, if you were cited, the defense will use it against you. Obtaining the police report early is essential.
- Witness statements: Independent witnesses carry significant weight with juries.
- Photographs and video: Dashcam footage, surveillance cameras, and photographs of the scene can establish or disprove fault.
- Physical evidence: Skid marks, vehicle damage patterns, and debris locations help accident reconstructionists determine what happened.
- Expert testimony: Accident reconstruction experts can analyze the physical evidence and provide opinions on speed, direction, and point of impact.
Common Comparative Negligence Arguments in Car Accidents
Insurance companies routinely raise comparative negligence to reduce claim values. Here are the most common arguments and how they apply:
Speeding: If you were exceeding the posted speed limit, the insurer will argue you had less time to react and your speed contributed to the severity of the collision. Even a few miles over the limit can be used against you.
Distracted driving: Phone records showing you were texting or calling at the time of the collision can be devastating to a claim. Massachusetts bans handheld phone use while driving under the Hands-Free Law (M.G.L. c. 90, Section 13B).
Failure to wear a seatbelt: Massachusetts law requires seatbelt use (M.G.L. c. 90, Section 13A), but there is an important nuance. Adjusters sometimes raise seatbelt nonuse, yet the statute does not make a violation evidence of negligence, and Massachusetts courts have generally refused to let defendants use seatbelt nonuse to establish comparative negligence. Do not let an adjuster discount your claim on this basis without talking to an attorney.
Following too closely: In rear-end collisions, there is a strong presumption that the following driver is at fault. However, the lead driver can share fault if they stopped suddenly without reason or had non-functioning brake lights.
Failure to mitigate: The insurer may argue you are partially at fault for the severity of your injuries because you delayed medical treatment. Seeking prompt medical attention after a collision protects your health and your claim.
Comparative Negligence in Slip and Fall Cases
Premises liability cases often involve significant comparative negligence disputes. Property owners frequently argue that the injured person should have seen the hazard and avoided it.
Common comparative negligence arguments in slip and fall cases include:
- You were not paying attention to where you were walking
- You were wearing inappropriate footwear for the conditions
- The hazard was “open and obvious” and you should have avoided it
- You ignored warning signs or barriers
- You were in an area where you were not expected to be
In snow and ice cases, the defense will almost always argue that the plaintiff knew the conditions were slippery and should have been more careful. Massachusetts courts hold property owners to a duty of reasonable care for snow and ice hazards. The Supreme Judicial Court’s 2010 decision in Papadopoulos v. Target Corp. abolished the old distinction between “natural” and “unnatural” accumulation, so owners can no longer avoid liability simply because the snow or ice accumulated naturally.
Comparative Negligence and the Tort Threshold
For car accident claims in Massachusetts, comparative negligence interacts with the tort threshold. Before comparative negligence even becomes relevant, you must first meet the tort threshold: your reasonable and necessary medical expenses must exceed $2,000, or your injuries must include death, a fracture, loss of a body member, permanent and serious disfigurement, or qualifying loss of sight or hearing (M.G.L. c. 231, Section 6D).
Once you clear the tort threshold, comparative negligence determines how much of your damages you can actually recover.
Multiple Defendants and Shared Fault
When more than two parties are involved, fault percentages are divided among all parties, including the plaintiff. For example, in a three-car collision:
- Plaintiff: 10% at fault
- Defendant A: 60% at fault
- Defendant B: 30% at fault
The plaintiff’s $200,000 in damages would be reduced by 10%, resulting in a $180,000 recovery. Note that the plaintiff’s fault is compared against the combined fault of all defendants, so a plaintiff who is less at fault than the defendants together can still recover.
Massachusetts follows joint and several liability for defendants. A plaintiff can collect the entire judgment from any one of the liable defendants, and a defendant who pays more than its share can seek contribution from the others under M.G.L. c. 231B. Contribution among defendants is generally divided in equal shares, without regard to their relative degrees of fault. This rule protects plaintiffs when one defendant is uninsured or cannot pay.
How Insurance Companies Exploit Comparative Negligence
Insurance adjusters use comparative negligence as one of their primary tools to reduce claim values. Common tactics include:
Inflating your fault percentage during negotiations: An adjuster might claim you were 40% at fault when the evidence supports 10%. This is a negotiation strategy designed to lower the settlement offer.
Seeking recorded statements: Adjusters ask detailed questions designed to elicit admissions that can be used to argue comparative negligence. Saying “I didn’t see them coming” can be twisted into evidence that you were not paying attention.
Using social media against you: Posts showing physical activity after the collision can be used to argue you are exaggerating injuries or failed to mitigate damages.
Arguing the 51% bar: In borderline cases, the insurer may argue you were 51% or more at fault specifically to deny the claim entirely, knowing that the threat of a complete bar gives them enormous leverage in negotiations.
An experienced personal injury attorney knows how to counter these arguments. In many cases, the difference between a low settlement and full compensation comes down to how effectively comparative negligence arguments are neutralized.
Exceptions to Comparative Negligence
Not all personal injury claims in Massachusetts are subject to comparative negligence. Important exceptions include:
Dog bite cases: Massachusetts has a strict liability dog bite statute (M.G.L. c. 140, Section 155). The dog owner is liable regardless of negligence unless the victim was trespassing, tormenting the dog, or committing another tort at the time.
Workers’ compensation: Workers’ comp benefits are available regardless of fault. You do not need to prove negligence, and comparative negligence does not reduce your benefits. However, comparative negligence does apply to third-party claims against parties other than your employer.
Product liability: In defective product cases, Massachusetts follows a warranty-based theory of liability. The analysis differs from standard negligence, though a plaintiff’s conduct can still affect recovery in certain circumstances.
Protecting Your Claim When Fault Is Shared
If there is any possibility that you share some fault for your injuries, take these steps:
- Do not admit fault at the scene. Tell the police what happened factually, but do not say “it was my fault” or “I should have been paying more attention.”
- Do not give a recorded statement to the other driver’s insurance company without speaking to an attorney first.
- Preserve all evidence. Photographs, dashcam footage, and witness contact information can all help establish what actually happened.
- Get the police report. A police report documenting the other driver’s violations strengthens your position.
- Consult an attorney early. An attorney can begin investigating immediately and preserve evidence before it disappears.
Frequently Asked Questions
What is the comparative negligence rule in Massachusetts?
Massachusetts follows a modified comparative negligence rule under M.G.L. c. 231, Section 85. If you are partially at fault for your injuries, your recovery is reduced by your percentage of fault. However, if you are 51% or more at fault, you are barred from recovering anything. For example, if you are 30% at fault and your damages are $100,000, you recover $70,000.
Can I still recover compensation if I was partially at fault?
Yes, as long as you are 50% or less at fault. Your compensation will be reduced by your percentage of fault. If a jury finds you 20% at fault for a car collision and your total damages are $150,000, you would recover $120,000.
Who decides the fault percentages?
During settlement negotiations, fault percentages are argued between your attorney and the insurance company based on the evidence. If the case goes to trial, the jury assigns fault percentages to each party. The judge then reduces the verdict by the plaintiff’s percentage of fault.
Does comparative negligence apply to all personal injury cases?
Comparative negligence applies to most negligence-based personal injury cases, including car collisions, slip and falls, and workplace injuries. However, some claims have different rules. Dog bite cases in Massachusetts use strict liability under M.G.L. c. 140, Section 155, meaning the owner is liable regardless of negligence unless the victim was trespassing, tormenting the dog, or committing another tort.
How do insurance companies use comparative negligence against me?
Insurance adjusters routinely argue that the injured person shares fault in order to reduce the claim’s value. Common tactics include blaming the victim for speeding, not wearing a seatbelt, failing to avoid the hazard, or contributing to the severity of injuries by delaying treatment. An experienced attorney can counter these arguments with evidence and legal analysis.
About the Author
Christopher Murphy, Esq. is the Managing Partner of Scalli Murphy Law with offices in Everett and Danvers, Massachusetts. Attorney Murphy has represented personal injury victims across Massachusetts since 1999 and has been recognized as a Massachusetts Super Lawyer in Personal Injury. He has helped thousands of clients and families recover compensation after car accidents, premises liability incidents, wrongful death cases, and other personal injury claims.
Contact Scalli Murphy Law
If you have been injured and the insurance company is arguing that you were partially at fault, do not accept their assessment without legal guidance. Scalli Murphy Law has decades of experience fighting comparative negligence arguments and maximizing recoveries for injury victims across Massachusetts.
Call 617-387-7000 or 1-833-933-HURT for a free consultation. There is no fee unless we recover for you.
Everett Office: 537 Broadway, Everett, MA 02149
Danvers Office: 1 Webb Street, Danvers, MA 01923
Related Resources:
- Average Car Accident Settlement in Massachusetts (2026)
- Insurance Company Tactics: How Insurers Lowball Your Claim
- What to Do After a Car Accident in Massachusetts
- PIP Coverage in Massachusetts
This article provides general information about Massachusetts law and is not legal advice. Every case is different. For advice about your specific situation, contact Scalli Murphy Law, P.C. at 617-387-7000 for a free consultation.