New Mexico truck permits: what to buy before you cross
New Mexico taxes heavy trucks by the mile, through an annual account or at the port, and it sells oversize permits only online. Knowing which applies to each truck decides what you buy and when.
New Mexico truck permits in numbers
New Mexico truck permits come in three kinds. Trucks over 26,000 pounds that are registered or apportioned for New Mexico need a weight distance tax permit and quarterly returns. Out-of-state trucks without New Mexico registration pay trip tax per mile instead. Oversize or overweight loads need an NM-OPS permit before entry.
New Mexico splits truck credentials between two agencies. The Taxation and Revenue Department (TRD) runs the weight distance tax. NMDOT runs the ports of entry and NM-OPS, the online system for oversize, overweight, and trip permits.
This guide covers which of them applies to your truck, what each costs today, and what to settle before the truck reaches the state line.
The full briefing, read aloud
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Key takeaways
Over 26,000 pounds means weight distance tax
Trucks registered in New Mexico or apportioned for it pay 11.01 to 43.78 mills per mile, plus a $10 permit per truck each calendar year.
Returns are quarterly, even with no miles
They are due April 30, July 31, October 31, and January 31. TRD expects a return even if the truck never entered the state.
No New Mexico registration means trip tax
Out-of-state trucks over 12,000 pounds pay 7 to 16 cents a mile by weight, in lieu of registration fees and weight distance tax.
Oversize permits come first, and online
OS/OW permits are sold only through NM-OPS and must be in hand before entry. Ports do not sell them.
A single-trip OS/OW permit lasts five days
It costs $25 plus a weight fee above 86,400 pounds. A multiple-trip permit costs $250 for up to a year.
Buy from official sites only
NMDOT warns that bogus sites have sold fake OS/OW and weight distance permits, and it will not refund them.
In this articleContents
Which New Mexico truck permits do you need?
The New Mexico truck permits you need depend on where the truck is registered, what it weighs, and what it hauls. Most carriers deal with three.
| Permit or tax | Who needs it | Where to get it |
|---|---|---|
| Weight distance tax permit | Trucks over 26,000 lbs registered in New Mexico or apportioned for it | TRD, through its TAP portal |
| Trip tax permit | Out-of-state trucks over 12,000 lbs without New Mexico registration | A port of entry, or NM-OPS online |
| Oversize/overweight permit | Loads over legal size, or over 86,400 lbs gross | NMDOT, through NM-OPS only |
Fuel tax is separate. Ports sell fuel tax permits to carriers without IFTA credentials, which our guide to temporary fuel permits explains. For how state permits fit with IRP, IFTA, and UCR, see truck permits explained.
Who runs what in New Mexico
Since a 2021 law (Laws 2021, chapter 59), NMDOT has issued oversize and overweight permits and run the ports of entry, and it collects trip tax for TRD. Some older state pages still name the State Police's Motor Transportation Police, so rely on the current NMDOT and TRD pages linked in this guide.
How does the New Mexico weight distance tax work?
The weight distance tax is a per-mile tax on motor vehicles over 26,000 pounds declared gross weight that are registered in New Mexico or under proportional (IRP) registration, under Section 7-15A-3 NMSA 1978. The rate rises with weight and is set in mills per mile. A mill is a tenth of a cent.
| Declared gross weight | Mills per mile | Tax per 1,000 NM miles |
|---|---|---|
| 26,001 to 28,000 lbs | 11.01 | $11.01 |
| 40,001 to 42,000 lbs | 18.05 | $18.05 |
| 54,001 to 56,000 lbs | 27.29 | $27.29 |
| 70,001 to 72,000 lbs | 37.86 | $37.86 |
| 78,001 lbs and over | 43.78 | $43.78 |
A truck customarily used for one-way hauls, with 45 percent or more of its miles run empty, can apply to pay two-thirds of the rate. Register at the highest weight you will run in New Mexico, because operating above the declared weight is a violation.
Permits, returns, and deadlines
- Permit: one weight distance tax identification permit per truck, valid for the calendar year, with a $10 administrative fee for each permit and renewal. You can buy it in TAP with your FEIN, weight distance account number, and USDOT number.
- Returns: due April 30, July 31, October 31, and January 31 for the quarter just ended. TRD says a return is due even if the truck did not travel in New Mexico.
- E-filing: required once you pay the tax on two or more trucks.
- Annual option: if last year's tax was under $500 (combined with special fuel tax, if you owe it), you can elect by April 1 to pay once a year, by January 31.
- Records: keep them for four years. Under-reporting found in an audit adds a penalty of $100 to $4,000 per period.
Trucks at 55,000 pounds or more also need proof of the federal heavy vehicle use tax at registration. Our Form 2290 guide covers it.
What does a New Mexico trip permit cost?
A New Mexico trip permit for a truck is a per-mile trip tax. It applies to out-of-state commercial vehicles that are not registered or apportioned for New Mexico and not covered by reciprocity, and it is paid in lieu of registration fees and the weight distance tax.
| Gross vehicle weight | Trip tax per mile | Example: 400 NM miles |
|---|---|---|
| 12,001 to 26,000 lbs | $0.07 | $28 |
| 26,001 to 54,000 lbs | $0.12 | $48 |
| 54,001 to 72,000 lbs | $0.15 | $60 |
| Over 72,000 lbs | $0.16 | $64 |
Miles count from the point where you enter the state to your destination or exit. Pay at a port of entry, or set up an account and buy a single trip permit online through NM-OPS, as NMDOT's ports page directs.
Carriers hauling between New Mexico and Mexico, custom harvesters, and trucks that cannot name their exit point can use prepaid trip permits, sold in increments of at least $50. Unused balances are not refundable after a year and cannot be transferred to another carrier.
How do New Mexico oversize and overweight permits work?
A load over legal size or weight needs a special permit from NMDOT before it enters New Mexico. NM-OPS, the New Mexico Operating Permit System, is the only way to buy one: NMDOT says OS/OW permits must be bought online, before entry, and be in hand.
When you need one
- Wider than 8 feet 6 inches, the 102-inch federal width standard on the National Network
- Taller than 14 feet
- A single vehicle over 40 feet, or on designated highways a semitrailer over 57 feet 6 inches
- A load projecting more than 3 feet in front or 7 feet behind
- Gross weight over 86,400 pounds
The load must be irreducible. If it can reasonably be dismantled or reduced, New Mexico expects that instead of a permit.
Fees and validity
| Permit | Fee | Term and limits |
|---|---|---|
| Single trip | $25, plus 2.5 cents per mile for each 2,000 lbs (or major fraction) over 86,400 lbs | One one-way move, valid 5 days |
| Multiple trip | $250 | Up to 1 year or the insurance end date; up to 14 ft wide, 15 ft high, 120 ft long, and 140,000 lbs, within four contiguous counties and three interstates |
By our reading of the formula, a 120,000-pound load running 300 miles is 33,600 pounds over, which rounds to 17 units of 2,000 pounds. That is 17 × 2.5 cents × 300 miles, or $127.50, plus the $25 base: $152.50.
Movement rules to plan around
- Daylight only, from 30 minutes before sunrise to 30 minutes after sunset, unless the permit allows continuous movement (possible up to 10 feet wide, 14 feet 6 inches high, 120 feet long, and 140,000 pounds)
- No movement on New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving, or Christmas, or in inclement weather
- Weekday rush-hour bans in Albuquerque, Rio Rancho, Santa Fe, Las Cruces, and on I-25 between Santa Fe and Los Lunas, unless the permit says otherwise
- Escorts at 14 feet wide or more, or over 110 feet 1 inch long, using New Mexico-certified escort vehicles; some routes require them at narrower widths
- Over 170,000 pounds: an NMDOT engineering analysis of the route before a permit is issued
A permit with incorrect information is void, so check dimensions and axle spacings before you pay. You may carry the permit electronically if it is legible. Our oversize load permit guide covers planning across several states.
NMDOT also warns that bogus websites have sold fake OS/OW and weight distance permits at inflated prices, and it will not refund them. Buy through NM-OPS and TAP only.
What happens at a New Mexico port of entry?
New Mexico's ports of entry check credentials and weights, and they sell trip tax and fuel tax permits by credit card. They do not sell oversize or overweight permits. A truck subject to the weight distance tax must show its permit when it passes through a port.
NMDOT lists 12 ports. Four are open 24 hours, seven days a week:
| Port | Location | Direction |
|---|---|---|
| Anthony | I-10, mile marker 159 | Westbound |
| Lordsburg | I-10, mile marker 23 | Eastbound |
| Gallup | I-40, mile marker 12 | Eastbound |
| San Jon | I-40, mile marker 357 | Westbound |
The others, including Raton on I-25, Santa Teresa, Texico, and Oro Grande, keep shorter hours. Check NMDOT's port list before planning a night crossing on a smaller route.
How to get a truck ready for New Mexico
Four decisions cover most New Mexico runs. Make them before dispatch, not at the port.
Step 1: Choose weight distance or trip tax
If a truck runs New Mexico regularly, price adding the state to its IRP account and opening a weight distance account. Occasional trips can run on trip tax. Our trucking permits team can check each unit.
Step 2: Buy this year's weight distance permits
One per truck, each calendar year, and only through TRD's TAP portal.
Step 3: Order OS/OW permits in NM-OPS first
Confirm the route, escorts, holidays, and the five-day window before the load leaves the yard.
Step 4: Put the returns on the calendar
The next weight distance return, for July through September 2026, is due October 31, 2026.
How Simplex helps with New Mexico permits
Each truck can need a different mix of New Mexico credentials. We help you sort out which ones before dispatch.
State permits, truck by truck
Our trucking permits team identifies the permits each truck needs in each state, including trip and temporary fuel permits, and handles the paperwork.
Oversize and overweight moves
Our oversize permits service handles over-dimensional and overweight permits and helps plan the route before the load moves.
The annual registration
Running interstate? Our UCR registration and renewal service keeps the yearly filing current.
Frequently asked questions
What is NM-OPS?+
Can I buy a New Mexico trip permit online?+
How much is a New Mexico trip permit for a semi truck?+
Do I need a weight distance permit if I only cross New Mexico occasionally?+
Can I buy an oversize permit at a New Mexico port of entry?+
Where this information comes from
The requirements below come from New Mexico statute and rule, the Taxation and Revenue Department, and NMDOT, checked on September 24, 2026.
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1
TRD — Regulations Pertaining to the Weight Distance Tax Act (3.12 NMAC, rev. July 2023)
Sections 7-15A-3 to 7-15A-16: who pays, the rate schedule, one-way hauls, due dates, the annual option, records, the $10 permit fee, and penalties.
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2
TRD — Weight Distance Tax
The 26,000-pound threshold, quarterly due dates, filing even without New Mexico miles, e-filing, and the annual electronic permit.
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3
New Mexico Legislature — HB 806 (2005), Laws 2005, ch. 258
Section 7-15-3.1: who pays trip tax, the four per-mile rates, and prepaid trip permits.
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4
New Mexico Legislature — SB 186 (2021), Laws 2021, ch. 59
The transfer of ports of entry and oversize permits to NMDOT, the Section 66-7-413 permit fees, and semitrailer length limits.
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5
18.19.8 NMAC — Size and Weight of Vehicles and Loads
Permit before entry, validity, multiple-trip limits, movement hours, holidays, escorts, and the 170,000-pound engineering review.
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6
NMDOT — NM-OPS (New Mexico Operating Permit System)
OS/OW permits online only and before entry, what ports sell, and the fraudulent permit site warning.
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7
NMDOT — Ports of Entry
Online trip permits, the weight distance account link, and port locations and hours.
Written by
Simplex Group
Permits & Fuel Tax Team, Simplex Group
Reviewed for technical accuracy by a Simplex permitting manager before publication. Simplex has registered and filed permits and fuel taxes for interstate carriers across all 50 states for more than 20 years.
Published · Updated
Related articles and services
Settle New Mexico before the truck reaches the line
For heavy trucks, New Mexico taxes the miles one way or the other: through a weight distance account or through trip tax at the port. Oversize loads add a permit that has to be bought before the truck arrives.
If you want a second check on which New Mexico permits and accounts your trucks need, talk to our team.