The short version
Treat the two as witnesses with different vantage points, not competitors. The government record is the authority on brands, total losses, and junk-yard trips, and cheap enough to run on every candidate; Carfax is the authority on the accidents, service, and owners that never reach a title office, and expensive enough to save for the finalist. Screen with the first, confirm with the second, and let the conflicts between them — not the summary at the top of either — decide whether the car in front of you is the one it claims to be. Neither can prove a clean car. Both can prove a dirty one, and that is what you're paying for.
Carfax and NMVTIS answer the same question — what happened to this car before you met it — from opposite directions. NMVTIS is the federal title database: the record itself, fed by state titling agencies and by insurers and salvage yards that report because the law says they must. Carfax is a commercial aggregation: state records plus whatever its private network of repair shops, dealers, auctions, and police departments has agreed to share, assembled into one timeline with a verdict-shaped summary at the top.
Buyers who treat either one as the complete story get burned in a specific way. The Carfax-only buyer misses the junk-yard event that never reached a vendor; the NMVTIS-only buyer misses the collision that never became a total loss. This guide lays out what each report is built from, where each is the stronger witness, how the prices compare, and the one rule that makes the choice easy: screen with the cheap one, and read both on the car you're about to pay for.
What each report is built from
The difference is upstream of the report, in who is obligated to speak. Three kinds of organizations feed NMVTIS, and two of them report by legal requirement rather than by business arrangement:
- State titling agencies — the title itself: the issuing state, the date, and every brand applied, such as salvage, junk, flood, rebuilt, lemon-law buyback, or an odometer brand like Not Actual Mileage
- Insurance carriers — vehicles they have declared total losses, reported whether or not the car is ever re-titled
- Junk and salvage yards, dismantlers, and the auctions that handle salvage — vehicles that enter their inventory, flagged as parts-only or possibly repairable
- Odometer readings disclosed at each title transfer, since federal odometer disclosure is part of transferring a title on most vehicles
Where the government report is stronger
Carfax starts with a similar state layer and adds everything its own network is willing to share: police accident reports where it has access, service visits from enrolled shops, dealer and auction records, fleet and rental flags, recall status. Every line exists because a source with a reporting relationship passed it on — and that relationship is the product's strength and its ceiling in the same sentence.
The federal record is narrow, and inside that narrow lane it carries more authority than any commercial report can:
- Brands travel with the record, not the paper. A state logs a brand when it applies it, and a later clean title from a state with looser rules does not erase the entry — the salvage brand from three states ago still sits in the trail
- Insurer total losses are mandatory. A car an insurer wrote off shows up whether or not it was ever branded, and whether or not that insurer shares data with any vendor
- Junk and salvage-yard events are mandatory too. A car that physically passed through a dismantler's inventory is on record even if it was bought back, rebuilt in a driveway, and re-titled somewhere else
- It is the primary source. A commercial report relays what it learned from the states; the federal record is what the states reported, with one less step in which a line can go missing
- It costs a few dollars, so you can pull it on every car that earns a phone call instead of rationing it to the finalist
Where Carfax is stronger
That combination makes NMVTIS the right tool for title washing: a total-loss record beneath a clean current title, or a junk-yard event followed by a fresh title in another state, is the signature of a washed car, and the federal trail is where that signature is most likely to survive. But most of a car's life never touches a title office. That is Carfax's territory, and inside it the commercial report shows things the federal record cannot hold at all:
- Accidents that stayed below a total loss — a police-reported collision, an insurance claim repaired and returned to the road, an airbag deployment noted by a shop
- Service history from enrolled shops — oil changes, timing belts, brake jobs, each with a date and a mileage
- A denser odometer trail: readings from service visits, state inspections, and dealer listings between title events, not only at transfers
- Owner count and usage — how many hands the car has passed through, and whether it spent time as a rental, fleet, or taxi vehicle
- Open recalls and lemon-law flags, pulled from the manufacturer and the states
- The Buyback Guarantee, which under its terms covers specific DMV-reported title brands the report missed — not accidents, not odometer fraud, not damage nobody reported
The price shape
Read the coverage the way the company prints it. "No accidents reported" is not "no accidents"; it means none reached the network. An unenrolled body shop or a cash repair generates nothing, and the report stays clean. Carfax's strength is breadth, and breadth is sampled, not complete. The government record has the opposite shape: no breadth to speak of, and depth you can rely on within its lane.
The two are priced like different products because they are. At the time of writing, an NMVTIS report from an approved provider runs a few dollars, with some providers selling packs for buyers checking several cars. A single Carfax runs roughly forty-some dollars, with multi-report bundles that lower the per-report price but still cost several times a title record. Both figures drift, so treat them as the shape of the market rather than a quote. The federal report has one wrinkle of its own: it must come from the official provider list, and buying it from the right place is the whole procedure, since plenty of paid "title check" sites have no connection to the database.
The shape decides the order. A search that produces five or six candidates can't afford a Carfax on each, and doesn't need one: the cheap title record disqualifies the salvage, flood, and washed-title cars first, so the expensive report is bought once, on the car that survived. A dealer's free Carfax follows the same logic: it shows what reached one network, and the few-dollar federal pull is the cheapest second opinion you will ever buy.
Read both on the finalist
The rule that makes the choice easy: the two reports are different samples of the same life, and neither is a superset of the other. A car can be clean in one and dirty in the other in either direction — an insurer's total loss that the vendor's feed lacked, or a police-reported collision that never became a brand. For any car you're about to hand money to, pull both and read them against each other. The conflicts are the useful part:
- A total-loss or junk event in the federal record with no accident in the commercial one: the damage happened and the network never saw it — price the car as a rebuilt wreck or walk
- An accident in the commercial report with a clean federal record: expected, and the reason you bought the second report — the question now is how well it was repaired
- Odometer readings that disagree between the two, or a reading that drops anywhere in either: the highest credible figure is the floor, because mileage only accumulates
- A brand in either report that is missing from the paper title in the seller's hand: the document is telling you less than the record does
- Nothing on either: still not proof of a clean car, only that nothing was reported — a test drive and a pre-purchase inspection do the qualifying
Where AutoCheck fits, and what comes before any of it
The commercial side of the pair has a second vendor. AutoCheck is built the same way as Carfax — state records plus a private network — with stronger auction feeds and a lower price, and the head-to-head between the two covers which to buy when. Either one fills the same slot: the breadth report you read against the federal record on the finalist.
Before any of this costs money, the listing itself is free to read: reused photos, a price nobody else can match, a story built for urgency, a seller who won't text the VIN. Pasting the ad into a free browser check sorts out the listings that never deserved a VIN pull, so the reports go to cars that are at least real.