New Mexico doesn't charge regular sales tax on a used car. It charges a 4% motor vehicle excise tax when you title the car at MVD, on the price paid minus any vehicle trade-in. In a private sale, MVD won't go below 80% of the N.A.D.A. average trade-in value, so writing $500 on the bill of sale for a car worth $8,000 won't lower your tax. A real gift is tax-free with a notarized affidavit, and the deadlines are 30 days for a $20 late fee and 90 days before a 50% tax penalty.
I read MVD's vehicle titles page, the excise tax chapter of MVD's procedures manual and the state rule 3.11.4 NMAC on Oct 19, 2026. All figures below are as of that date. For the forms and signatures in a private deal, see our New Mexico private-sale title transfer guide.
The 4% excise tax and when you pay it
MVD's titles page says the excise tax applies to the sale of every vehicle that has to be registered in New Mexico, and that MVD presumes a sale happened every time a vehicle is titled. The tax is 4% of the price paid, less trade-in credit. It's due when you apply for the title. A dealer may handle that and collect the tax for you; in a private sale you pay MVD or one of its agents.
One date matters if you're cleaning up an old purchase. MVD's manual says the rate went from 3% to 4% on July 1, 2019, and the purchase date decides which applies. Oddly, the manual's reprint of the statute, marked revised November 20, 2017, still says three percent. Go by the 4% that MVD applies now.
How MVD values a private sale
This is where most buyers get surprised. For a used car not sold by a dealer, MVD uses the higher of the declared purchase price or 80% of the N.A.D.A. average trade-in (wholesale) value. The manual tells MVD agents to look up the value by VIN and actual mileage, without options. So the clerk, not your bill of sale, sets the floor.
A few exceptions are written into the manual. If the title has a salvage brand, MVD accepts the stated price. If no N.A.D.A. value exists for the vehicle, it accepts the price on the title or bill of sale. For motorcycles, which often show only rough and clean trade-in values, it uses 80% of the rough figure. And if your car really is worth less, because of a blown engine or body damage, you can't argue it at the counter. You pay, then file a Request for Refund (MVD-10208) with proof such as a body shop estimate or a written value from a dealer or appraiser.
Quick math: a car with an $8,000 N.A.D.A. average trade-in value has a floor of $6,400. Buy it privately for $5,000 and MVD taxes $6,400, so you owe $256 instead of $200.
Trade-ins: vehicles only
State rule 3.11.4.13 NMAC lets you deduct the value of a vehicle traded in on the purchase, and only vehicles count. The rule's own example is that you can't deduct the value of a horse traded in for a vehicle. I'm not making that up. Most trade-ins happen at dealers, but if you swap cars in a private deal, write both vehicles and the trade value on the bill of sale.
Gifts, family and exemptions
New Mexico doesn't have a blanket family exemption. What it has is the gift rule: if a vehicle is legitimately given away, no sale has happened and no excise tax is due. MVD requires a notarized Affidavit of Gift of Motor Vehicle or Boat (MVD-10018), signed by both the giver and the person receiving it, under penalty of perjury. Without it, MVD treats the transfer as a sale and taxes the higher of the price or reasonable value. The manual says outright that sales get disguised as gifts to dodge the tax, so don't try it with a car you paid for.
The statutory exemptions in 7-14-6 are narrow: a car bought out of state for personal use at least 30 days before you moved to New Mexico, a car you previously titled in New Mexico and kept owning, vehicles modified for a buyer's disability, certain veterans who lost the use of a leg or arm, and some lease vehicles. If you paid sales tax to another state on the same car, 7-14-7 allows that as a credit.
Deadlines and penalties
Apply for the title within 30 calendar days of the sale or MVD adds a $20 late transfer fee, and the date on the original bill of sale controls. Wait past 90 days and the excise tax gets a 50% penalty, which MVD notes works out to 6% instead of 4%. Plates stay with the owner in New Mexico, so the seller should take them off. For comparison with other states, see our used car sales tax overview.
Before you hand over cash
MVD only gives the salvage exception if the brand is on the title, and a brand can go missing when a car moves between states. Our New Mexico salvage and rebuilt title rules explain the brands. Check the history on NMVTIS and in a CARFAX or AutoCheck report. We resell both under license and aren't affiliated with CARFAX, AutoCheck or Experian. In mid October 2026 it was about $5.50 a report as a guest, about $4.50 as a member and about $6.75 for both, while retail sits around $39.99 to $44.99. Confirm at checkout.
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