Overview
What changes the bill is the base, not the rate: dealers and private sellers both get to subtract a trade-in first, a private-party price that looks suspiciously low gets compared against 80% of the vehicle's N.A.D.A. value, a true gift owes nothing if both sides sign a notarized affidavit, and if you already paid vehicle tax in another state, that payment is credited against what New Mexico would otherwise charge.
01 - Official fees
New Mexico car sales tax fees at a glance
| Fee | Amount | Notes |
|---|---|---|
| Standard rate | 4% | dealer and private sales statewide |
| Taxable base | price − trade-in | |
| Private-sale floor | max(price, 80% × N.A.D.A. value) | |
| Legitimate gift (Form MVD-10018) | $0 | any relationship, notarized affidavit required |
| Out-of-state tax already paid | Credited against MVET | |
| Late-titling penalty (90+ days) | +50% of tax owed |
Figures verified June 2026 against official sources (listed below). Always confirm the final amount with an MVD field office or authorized MVD Express/MVD Now partner (New Mexico Motor Vehicle Division) - counties can add small local fees.
03 - Same state, other costs
More New Mexico vehicle costs
04 - Common questions
New Mexico car sales tax FAQ
Why did the MVD tax me on more than what I actually paid?
You likely hit the N.A.D.A. floor. On private-party sales, New Mexico taxes the higher of your declared price or 80% of the vehicle's N.A.D.A. average trade-in/wholesale value. Pay $6,000 for a car with a $10,000 N.A.D.A. value and you're taxed on $8,000, not $6,000.
Can I contest the N.A.D.A. value if the car is in rough shape?
The statute allows the excise tax to be based on the 'reasonable value' of the vehicle in its actual condition rather than a blanket N.A.D.A. figure - bring documentation of the condition (repair estimates, photos) to make that case at the MVD counter.
Does a trade-in reduce the excise tax?
Yes, for both dealer and private-party transactions - the 4% applies to price minus the trade-in allowance, unlike states that only allow the trade-in credit at a dealership.
Is gifting a car really tax-free, even to a friend?
Yes. Unlike states that only waive tax for close family, New Mexico exempts any legitimate gift from the MVET - the requirement is a notarized Affidavit of Gift of Motor Vehicle or Boat (MVD-10018) signed by both the giver and recipient, not a specific relationship.
I just moved to New Mexico with a car I already own - do I owe 4%?
You owe the 4% MVET when you title it here, but any vehicle tax you already paid to your prior state is credited against it. If that tax was 4% or more, you owe nothing further; if it was less, you pay the difference.
What's the penalty for paying the excise tax late?
A 50% surcharge on the tax itself if you (as a New Mexico resident) don't title the vehicle within 90 days of taking ownership - in state or after bringing it in from elsewhere. A $1,000 tax bill becomes $1,500. That's separate from the $20 flat late-title fee that starts at 30 days.
Are any sales fully exempt from the MVET besides gifts?
Yes - transfers to certain governmental entities, some nonprofit and tribal transactions, and vehicles inherited through an estate are handled outside the standard MVET, though the paperwork differs by case. Ordinary private sales, including deliberately low ones, still face the 80% N.A.D.A. floor.
05 - Receipts
Official sources
Every number on this page comes from these documents - check them yourself.