Michigan Snowbird in Arizona: How No-Fault Affects Your Coverage

Arizona mandates liability coverage only: $25,000 per person and $50,000 per accident for bodily injury, plus $15,000 for property damage. There is no requirement to carry personal injury protection, medical payments coverage, or uninsured motorist bodily injury coverage, though all three are available as optional add-ons. If you're coming from Michigan's unlimited PIP system, this feels like a massive downgrade. Arizona operates as a fault-based state. The at-fault driver's liability coverage pays the other party's medical bills and vehicle damage. If you're injured and the other driver is uninsured or underinsured, you're left filing a lawsuit or tapping your own health insurance unless you've added optional uninsured motorist coverage to your Arizona policy. Michigan snowbirds who switch registration often don't realize they've lost medical coverage until they're hurt in an accident. Arizona's $25,000 per person liability minimum is far below what a serious injury costs. A three-day hospital stay can exceed that limit. If the at-fault driver carries only the state minimum and your injuries exceed it, you're personally responsible for the difference unless you carry underinsured motorist coverage.

Arizona law requires registration if you become a resident. Residency is established by staying more than 7 months in a calendar year or taking any action that demonstrates intent to make Arizona your domicile: applying for an Arizona driver's license, registering to vote in Arizona, claiming Arizona residency for in-state tuition, or filing as an Arizona resident for state income tax purposes. If you winter in Arizona for 4 to 6 months and spend the rest of the year in Michigan, you are not required to register in Arizona. You remain a Michigan resident, your vehicle stays Michigan-plated, and your Michigan no-fault policy continues to cover you in both states. This is the most common snowbird pattern and the cleanest insurance scenario. The decision point is often driven by factors unrelated to insurance: property tax differences, vehicle registration fees, or estate planning considerations. Some snowbirds switch to Arizona registration because it's cheaper. That decision has insurance consequences. Once you register in Arizona, your Michigan carrier will require you to convert to an Arizona policy or find a new carrier that writes Arizona coverage. Your unlimited PIP coverage ends immediately, and you're purchasing liability-only coverage unless you manually add medical payments or uninsured motorist protection.

Keep your vehicle registered in Michigan and maintain your Michigan residence as your primary domicile. Do not apply for an Arizona driver's license. Do not register to vote in Arizona. Do not file Arizona state income taxes as a resident. Stay in Arizona fewer than 7 months per calendar year. Notify your Michigan carrier that you'll be in Arizona seasonally and confirm your policy covers you out of state. All Michigan policies cover you nationwide, but some carriers adjust rates or require you to list the Arizona address as a secondary location. This does not terminate your no-fault coverage as long as the vehicle remains Michigan-registered and you remain a Michigan resident. If your carrier increases your premium when you add the Arizona address, it's typically because Arizona's urban areas have higher theft and collision rates than rural Michigan, not because your coverage changed. Your PIP, liability, and comprehensive coverage remain active under Michigan rules. The rate adjustment reflects where the vehicle is parked for half the year, not a change in your coverage structure.

Arizona liability-only policies cost significantly less than Michigan no-fault policies because Arizona doesn't require personal injury protection. The average Arizona liability policy runs $80 to $130 per month for a senior driver with a clean record. Michigan policies with unlimited PIP average $180 to $280 per month, even for drivers over 65. The lower premium reflects the elimination of medical coverage, not better protection. If you switch to Arizona registration and accept the state minimum liability limits, you're saving money by shedding the coverage that protects you after an accident. To replicate anything close to Michigan's protection, you'd need to add medical payments coverage and uninsured/underinsured motorist bodily injury coverage to your Arizona policy, which brings the total premium closer to what you were paying in Michigan. Some snowbirds maintain both a Michigan-registered vehicle and an Arizona-registered vehicle to preserve no-fault coverage on one car while taking advantage of Arizona's lower registration fees on the other. This works if you're insuring two vehicles and spending significant time in both states, but it requires two separate policies and careful coordination to avoid coverage gaps.

The most dangerous gap is medical coverage. Arizona's tort system means the other driver's liability policy pays your medical bills only if they're at fault and only up to their policy limits. If you're injured in a single-vehicle accident, hit by an uninsured driver, or hurt in an accident where fault is disputed, you have no automatic medical coverage unless you've added optional medical payments or uninsured motorist protection. Michigan's PIP covers your medical bills immediately, regardless of fault, with no cap if you elected unlimited coverage. That protection disappears in Arizona unless you've purchased medical payments coverage, which typically caps at $5,000 to $25,000 per person — far below what unlimited PIP provided. Most snowbirds don't add it because they assume Medicare or their health insurance will cover accident injuries. Medicare covers some accident-related costs, but it doesn't cover everything, and it may seek reimbursement from any settlement you receive. Another gap: property damage liability limits. Michigan requires $10,000 in property damage coverage. Arizona requires $15,000. If you're accustomed to carrying Michigan's minimum and you total a $40,000 vehicle in Arizona, your $15,000 liability limit leaves you personally exposed for the remaining $25,000. Snowbirds switching to Arizona should raise property damage limits to at least $50,000 and consider adding uninsured motorist property damage coverage.

Most national carriers will write an Arizona policy for a Michigan snowbird, but not all carriers write in both states, and coverage structure changes completely when you switch registration. State Farm, GEICO, Progressive, Allstate, and Nationwide all write policies in Michigan and Arizona, but if you register in Arizona, you're issued an Arizona policy governed by Arizona law, not a Michigan policy that extends to Arizona. If you want to keep your vehicle Michigan-registered and maintain Michigan no-fault coverage while wintering in Arizona, notify your current Michigan carrier of your seasonal address. Most will continue coverage without issue. Some carriers restrict out-of-state garaging to six months or require you to list the Arizona address as a secondary location. This does not change your coverage — you're still insured under Michigan no-fault as long as the vehicle stays registered in Michigan. If you're switching registration to Arizona, shop the Arizona market separately. The carrier you used in Michigan may not offer competitive rates in Arizona, and Arizona carriers price based on metro area, vehicle theft rates, and your age differently than Michigan carriers. Drivers over 65 often qualify for mature driver discounts in Arizona, but you must request them — carriers do not apply them automatically when you switch states.