Michigan Delivery Insurance: $4,282 to $6,851 by ZIP

The usual objection to pricing reimbursement by ZIP is that insurance is insurance: a driver in Detroit and a driver in St. Joseph both buy a policy, both drive the same route, and a single company-wide rate ought to cover both. That is a fair position, and for most costs it holds. Fuel moves a few cents between markets. Maintenance barely moves at all.

Insurance does not behave that way in Michigan, and this piece sets out what the filed rates actually say: where Michigan sits against other states, how far the number moves inside the state, what the Sixth Circuit did to the usual defense, and what all of that does to a per-mile rate.

Michigan and California price new cars alike, then part company

The honest headline is not that Michigan is the most expensive state. On current filings it is second, and the margin at the top is almost nothing. For a new full-size sedan California averages $5,324 a year delivery-rated against Michigan's $5,314, a difference of ten dollars. The same holds for new mid-size and new compact: the two states are within a fraction of a percent.

They separate on older cars, and they separate hard:

These are filed figures, averaged by class, not estimates: Michigan from a four-carrier SERFF blend effective March 2026 across 280 ZIPs, California from a three-carrier blend effective May 2026 across 1,864, North Carolina from the 2025 bureau filing.

In Michigan the car's age is the lever. In California it barely moves

Read down each column and the difference is stark. A Michigan operator whose drivers run older full-size cars pays $2,863 against $5,314 for new ones: the old car costs 46 percent less to insure. In California the same swap saves 12 percent, from $5,324 to $4,695. California prices an old car almost like a new one. Michigan does not.

That is the argument for pricing per vehicle rather than per store, and it is strongest exactly where you would least expect it. In a flat-rate state the car a driver happens to own matters less. In Michigan it is most of the answer, and a single rate across a mixed fleet is wrong by a wider margin than anywhere else we hold filings for.

Correction, 22 September 2026. An earlier version of this page said Michigan carried the highest filed premium in every new vehicle class, and put California at $4,888 for a new full-size sedan. That California average was computed across three filing vintages at once, mixing 2023 and 2024 rows into a 2026 figure and understating it. Measured on current filings alone, California is slightly higher than Michigan in every class. The table and the surrounding text have been corrected.

Inside one state, the same car moves 60 percent

The spread within Michigan is wider than the gap between most states. For a new full-size sedan, the filed delivery-rated premium runs from $4,282 a year in ZIP 49085, St. Joseph, to $6,851 in ZIP 48225, Harper Woods. That is the same car, the same coverage and the same year, separated by about 180 miles of road.

At 20,000 miles a year, insurance alone is 21.4 cents a mile for the first driver and 34.3 cents for the second. Before a drop of fuel, the gap between two drivers in one state is nearly 13 cents a mile. A store paying one flat rate is absorbing that difference in one direction or handing it to a driver in the other.

Parker v. Battle Creek Pizza is binding here, and it removes the usual answer

The familiar response is to pay the IRS standard mileage rate, currently $0.76 a mile, and treat the question as closed. In the Sixth Circuit that is no longer a safe answer. In Parker v. Battle Creek Pizza (6th Cir. 2024), the court held that paying the IRS rate is not automatically reasonable, and that these disputes turn on case-specific evidence of what the vehicle actually costs. Bradford v. Team Pizza was decided alongside it.

That holding is binding in Michigan, Ohio, Kentucky and Tennessee, and persuasive elsewhere. This is where Michigan genuinely stands apart. California prices new cars about the same and older cars considerably higher, but California sits in the Ninth Circuit, where Parker is persuasive rather than binding. Michigan pairs near-top insurance costs with the one circuit that has already rejected the shortcut. A Michigan operator asked to justify a flat rate has to do it on evidence, across a fleet where the evidence varies more by vehicle than anywhere else we hold filings for.

What it does to a per-mile rate

Insurance is a fixed annual cost, so its per-mile weight depends entirely on how far the car is driven. The widget above does that arithmetic against the filed premiums. The pattern it shows is worth stating plainly, and the figures in this section are modeled and illustrative:

• Low-mileage drivers are the expensive ones. The same $5,195 premium in Novi is 26 cents a mile at 20,000 miles and 43 cents at 12,000. A part-timer costs more per mile than a closer, not less.
• The ZIP moves the answer more than the car does in some cases. A new compact in Harper Woods can cost more to insure than a new full-size in St. Joseph.
• Insurance alone can eat half the IRS rate. At 12,000 miles in a high-premium ZIP, the insurance line on its own passes 55 cents against a $0.76 reimbursement, leaving very little for fuel, depreciation, maintenance and tyres.

What to do with this

None of this argues for paying more. It argues for paying the right amount per driver, which in a state like Michigan is sometimes less than a flat rate and sometimes considerably more. The operators who get caught are the ones paying a single number into a market where the underlying cost varies by 60 percent across their own footprint.

RatesReady calculates a defensible per-mile rate for each driver from the vehicle they actually drive, filed insurance data for the store's ZIP, local fuel, and depreciation, registration, maintenance and tyres for that vehicle in that state. It refreshes monthly and keeps the documentation an auditor or a plaintiff's expert would ask for. It starts at $49 per location per month. If you run stores in Michigan or anywhere else in the Sixth Circuit, request a demo and we will run your ZIPs against the filed data.

Sources and limits. Premiums are delivery-rated figures derived from carrier filings: Michigan from a four-carrier SERFF blend effective March 2026, California from a three-carrier blend effective June 2023, North Carolina from the 2025 bureau filing. Delivery rating applies a uniform 1.2 multiplier to the personal-use premium. Per-mile conversions are modeled at the stated annual mileage and are illustrative. This is general information for operators and is not legal, tax or insurance advice.