Here is the border, in two numbers. The average dealer doc fee in Massachusetts is $558. In New Hampshire it is $604, so Massachusetts wins the fee line by $46. But Massachusetts charges 6.25 percent sales tax on a car purchase and New Hampshire charges none, which on a $40,000 vehicle is $2,500 against $0. The fee gap is real. The tax gap is 54 times larger. CarThrive has graded the fee transparency of 103 New Hampshire dealers and 266 Massachusetts dealers from their own published pricing, and this article tables both states honestly: what the average fee is, who charges the least and the most, what the rules require in each state, and what a $40,000 purchase actually costs on each side of the line.

Run your own number

Enter a vehicle price and pick a fee basis. The calculator applies each state's average doc fee, or the uniform $499 fee charged by one dealer group with stores in both states, plus the state title fee and Massachusetts sales tax. Registration is left out on purpose: Massachusetts registration varies by plate type, and New Hampshire registration is set by your town and the vehicle, so no single honest number exists for either state.

The scoreboard

Two patterns stand out. First, the ranges overlap almost completely: both states have dealers under $200 and dealers approaching $900 or more, so the state line predicts far less about your fee than the store you pick. The spread inside New Hampshire, $0 to $899, is wider than the $46 gap between the state averages. Second, Massachusetts dealers cluster at the top of the transparency grades at more than twice the New Hampshire rate, 71 of 266 against 11 of 103. The likely reason is in the rulebook section below: Massachusetts law dictates exactly where the fee has to appear, and that placement is the single largest category in our grading rubric.

The $40,000 sale, line by line

At the same dealer group in both states the comparison gets cleaner, not closer. Quirk Auto Dealers charges a uniform $499 doc fee, published on a dedicated fee page and itemized inside its advertised prices, at its four Manchester, New Hampshire stores and its thirteen graded Massachusetts stores. At $499 on both sides of the line, the entire remaining difference is the tax and the title fee: $40,534 in New Hampshire against $43,074 in Massachusetts on the same $40,000 car. That is worth knowing if you cross the border to shop: the store group cannot change the tax, and neither can you, because sales tax follows where you register the car, not where you buy it. A Massachusetts resident who buys in New Hampshire still owes Massachusetts tax when registering at home. The border only helps people who actually live on the New Hampshire side of it.

What the doc fee actually pays for

The doc fee, called a documentation fee, dealer doc fee, or administrative fee depending on the store, is the dealer's charge for the paperwork side of the sale: preparing and filing the title application, handling the registration, processing the lien if you finance, and keeping the transaction records the state requires the dealer to keep. It is not a state fee, and the state does not set its size in either New Hampshire or Massachusetts. The dealer sets it, prints it, and, at a well run store, charges the same amount to every buyer. The government charges in the tables above are separate and much smaller: the title fee is $35 in New Hampshire (raised from $25 on January 1, 2026, under RSA 261:20) and $75 in Massachusetts, and registration is extra in both states.

One New Hampshire cost surprises Massachusetts shoppers. New Hampshire has no sales tax, but it does charge an annual municipal permit fee at registration, set by RSA 261:153 at 18 mills on the vehicle's original list price in its first year and falling each year to a floor of 3 mills. On a vehicle with a $40,000 list price that is $720 the first year, paid to your town, and it comes back every year at a lower rate as the vehicle ages. Massachusetts has its own annual motor vehicle excise tax. Neither annual charge changes the purchase day math above, but New Hampshire's is the one that catches cross border shoppers off guard, because it is billed as a registration fee rather than a tax.

Two states, two rulebooks

Massachusetts regulates placement, not size. Under the Attorney General's motor vehicle advertising regulations, 940 CMR 5.02(3), an advertised price must include every charge the dealer necessarily imposes, the doc fee expressly among them. In June 2026 the Attorney General's office advised every dealer in the Commonwealth that disclosing the doc fee separately, even prominently, does not comply: the fee has to be inside the advertised price. Massachusetts sets no cap on the amount, which is why a state with the stricter advertising rule still produces the region's highest published fee, $982, at four western Massachusetts stores. The rule governs where the number sits, and our grades show most Massachusetts dealers following it.

New Hampshire has no equivalent all in advertised price rule and no cap either. A New Hampshire dealer's obligations on pricing run through the state's general consumer protection law, RSA 358-A, which prohibits unfair or deceptive acts without prescribing where a doc fee must appear in an ad. In practice that makes the dealer's own published stack the whole story, which is exactly what our grades measure. It also explains the strangest line in the New Hampshire data below: the state's only $0 doc fee belongs to a dealer graded C, because one of its own pages quotes a different fee than its price stacks do.

How CarThrive grades each state

Every dealer above was scored on the same five part rubric, from its own published pricing: fee level (30 points), the fee itemized inside the advertised price (30), public disclosure (20), consistency across the dealer's own site (10), and no forced add ons (10). A grade of A starts at 88. The rubric is why a cheap fee alone does not win. Portsmouth Ford in New Hampshire itemizes a $0 documentation fee in its payment panels, the lowest fee in either state, yet scores 72, a C, because its Ford Certified page states that prices exclude a $280 doc fee: the store contradicts itself, and consistency is worth 10 points and placement credit suffers with it. Place Motor Inc. in Webster, Massachusetts charges the state's lowest fee, $175, itemized inside the price on its stacks, and still lands at 91 rather than higher because its disclaimer says the fee is not included. At the top of both states sit dealers who pair a low fee with one consistent story: Betley Chevrolet in Derry, New Hampshire at $200 in combined title and administrative fees and a 96, and in Massachusetts a three way tie at 96 among Hiller Company Chrysler Dodge Jeep Ram in Marion ($295), K-M Toyota in North Adams ($200), and Tuck's Trucks GMC in Hudson ($299).

The extremes in each state

New Hampshire: lowest published fees

New Hampshire: highest published fees

Massachusetts: lowest published fees

Massachusetts: highest published fees

Where the transparency grades point

The top graded dealers in each state, with Quirk stores shown where their grades place them, listed with each store's published fee and its Google rating. Every dealer here itemizes its fee inside the advertised price unless the card says otherwise.

Disclosure: CarThrive's publisher also handles marketing for Quirk Auto Dealers, which operates six of the eleven stores above. The highest grade in each state belongs to a dealer with no connection to the publisher, and every store shown was graded on the same published rubric applied to every dealer CarThrive grades, scored from its own published pricing and checked in October 2026.

Method and sources

Fees and grades are from CarThrive's Price Transparency Grades, scored from each dealer's own published vehicle pages, specials, and disclaimers and checked in October 2026; the graded sets are 103 New Hampshire dealers and 266 Massachusetts dealers. State average doc fees, New Hampshire $604 and Massachusetts $558, are the CarEdge state averages printed on every CarThrive grade page. Sales tax and title figures are from the Massachusetts Registry of Motor Vehicles (buyer is responsible for the registration fee, the title fee, and 6.25 percent sales tax on a dealer purchase; title fee per the RMV fee schedule) and New Hampshire RSA 261:20 (title fee $35 effective January 1, 2026). The New Hampshire municipal permit fee schedule is RSA 261:153. The Massachusetts advertising rule is 940 CMR 5.02(3) and the Attorney General's June 2026 advisory on motor vehicle documentary preparation fees. The $40,000 comparison excludes registration (which varies by plate type in Massachusetts and by town and vehicle in New Hampshire), excludes any trade-in credit (which reduces the Massachusetts taxable price), and treats the state average fee as the dealer's fee; your dealer's actual fee is in its grade. Nothing here is legal advice; it is a pricing comparison built from published figures.

Related reading

• Dealer Doc Fees in Massachusetts and New Hampshire: Who Charges What
• Massachusetts Dealer Fees and Transparency Grades
• How CarThrive Grades Dealer Fees and Price Transparency
• All dealer fee transparency grades