How much did New Mexico raise the weight-distance tax in 2026?

About 35% in every weight bracket. Senate Bill 2 (Laws 2026, Chapter 4), signed February 5, 2026, amended the rate schedule in NMSA 7-15A-6 effective July 1, 2026: the bottom bracket rose from 11.01 to 14.86 mills per mile and the top bracket (78,001 lbs and over) from 43.78 to 59.10 mills — about 4.378¢ to 5.91¢ per mile.

What is the New Mexico WDT rate for an 80,000-lb truck now?

5.91 cents per mile on the full-haul schedule in force since July 1, 2026 — up from 4.378 cents. A carrier registered as a one-way hauler pays two-thirds of that, about 3.94 cents per mile.

Which quarter files at the new NM WDT rates first?

Q3 2026 (July–September miles), due at the end of October, is the first return computed on the new schedule. Q1 and Q2 2026 filed on the old rates, and an amended return for any pre-July quarter stays on the schedule that was in force then — don't apply the new rates to first-half miles.

Did the one-way haul discount survive the increase?

Yes. A vehicle that customarily hauls loaded one direction and empty the other, with 45% or more of its registration-year miles run empty, can still be classified by sworn application for two-thirds of the standard rate. The mechanism didn't change — but at the higher schedule the election is worth about a third more in absolute dollars.

Did the WDT permit fee or the port-of-entry trip tax change too?

No. The annual weight-distance permit is still capped at $10 per vehicle by statute, and the per-trip trip tax collected at ports of entry sits in a separate act — it still runs 12 to 16 cents a mile for vehicles over 26,000 lbs that aren't WDT-registered. The bus rate schedule in NMSA 7-15A-7 wasn't raised either; SB 2 rewrote the truck table in 7-15A-6.

Costs

New Mexico raised its weight-distance tax 35%: the new rate table, and the quarter where it starts

By TruePermitReviewed by the TruePermit compliance teamUpdated August 19, 2026

On July 1, 2026, every bracket of New Mexico's weight-distance tax went up about 35% — the first schedule change in years, passed in February as Senate Bill 2 and now the law your Q3 return files on. An 80,000-lb truck that paid 4.378¢ a mile through June pays 5.91¢ from July 1. Most rate sheets floating around online still show the old numbers. Here is the complete new table next to the old one, straight from the amended statute, and the mid-year filing boundary that decides which schedule each quarter uses.

What changed on July 1 — and by exactly how much

Senate Bill 2 of the 2026 regular session (Laws 2026, Chapter 4, signed February 5, 2026) rewrote the rate table in NMSA 7-15A-6, the section that prices every mile a vehicle over 26,000 lbs declared gross weight runs on New Mexico highways. The statute quotes rates in mills — thousandths of a dollar — per mile: the bottom bracket (26,001–28,000 lbs) moved from 11.01 to 14.86 mills, the top bracket (78,001 lbs and over) from 43.78 to 59.10 mills, and every bracket between rose by the same roughly 35%. Section 7 of the act made it effective July 1, 2026.

Just as important is what SB 2 left alone. The one-way haul classification still pays two-thirds of the standard rate. The 26,000-lb threshold, the quarterly filing calendar, and the $10-a-year permit didn't move. The bus schedule in 7-15A-7 wasn't raised. And the trip tax charged at ports of entry to unregistered vehicles lives in a separate act at its old 12–16¢ a mile — which means the gap between being registered and paying the port rate got smaller, but registered is still roughly a third the cost.

The full table: every bracket, old vs new

Full-haul rates per mile by declared gross weight. The last column is what the increase adds per 1,000 New Mexico miles in that bracket. One-way haulers registered as such pay two-thirds of each figure.

New Mexico weight-distance tax rates by declared gross weight: the schedule through June 30, 2026 versus the schedule from July 1, 2026, with the added cost per 1,000 miles
Declared GVW (lbs)	Through Jun 30, 2026	From Jul 1, 2026	+ per 1,000 mi
26,001–28,000	1.101¢	1.486¢	$3.85
28,001–30,000	1.188¢	1.604¢	$4.16
30,001–32,000	1.277¢	1.724¢	$4.47
32,001–34,000	1.364¢	1.841¢	$4.77
34,001–36,000	1.452¢	1.96¢	$5.08
36,001–38,000	1.539¢	2.078¢	$5.39
38,001–40,000	1.673¢	2.259¢	$5.86
40,001–42,000	1.805¢	2.437¢	$6.32
42,001–44,000	1.936¢	2.614¢	$6.78
44,001–46,000	2.069¢	2.793¢	$7.24
46,001–48,000	2.201¢	2.971¢	$7.70
48,001–50,000	2.333¢	3.15¢	$8.17
50,001–52,000	2.465¢	3.328¢	$8.63
52,001–54,000	2.596¢	3.505¢	$9.09
54,001–56,000	2.729¢	3.684¢	$9.55
56,001–58,000	2.862¢	3.864¢	$10.02
58,001–60,000	2.993¢	4.041¢	$10.48
60,001–62,000	3.124¢	4.217¢	$10.93
62,001–64,000	3.258¢	4.398¢	$11.40
64,001–66,000	3.39¢	4.577¢	$11.87
66,001–68,000	3.521¢	4.753¢	$12.32
68,001–70,000	3.652¢	4.93¢	$12.78
70,001–72,000	3.786¢	5.111¢	$13.25
72,001–74,000	3.926¢	5.3¢	$13.74
74,001–76,000	4.071¢	5.496¢	$14.25
76,001–78,000	4.221¢	5.698¢	$14.77
78,001 and over	4.378¢	5.91¢	$15.32

These are the same period-stamped rows our tax engine files returns on — the pre-July and current schedules are both kept, because both are still needed (amended returns, late filings, and Q2 stragglers all price at the old rates). If you'd rather not read a table, the free NM WDT calculator prices any weight and mileage on either schedule.

The mid-year boundary: Q2 files old, Q3 files new

New Mexico's WDT is filed quarterly, by the last day of the month after each quarter closes — April 30, July 31, October 31, January 31. The increase took effect exactly on a quarter boundary, so the split is clean: miles through June 30 price at the old schedule, miles from July 1 at the new one. The Q3 2026 return, due at the end of October, is the first computed on the new rates.

Two ways carriers get this wrong. Applying the new rates backward — an amended Q1 or Q2 return, or a late first-half filing, stays on the schedule that was in force during those quarters. And applying the old rates forward, usually because a rate card printed in 2025 is still taped to the office wall: underpay Q3 by the ~26% difference and the balance comes back with penalty (2% a month, capped at 20%, $5 minimum) and interest on top. Check the effective date on any NM rate sheet you didn't generate this quarter — as of this writing, most of the top search results for "New Mexico weight distance tax rates" still show the pre-July table.

What 35% means in dollars

At 80,000 lbs, the jump from 4.378¢ to 5.91¢ is $15.32 more per 1,000 New Mexico miles. Crossing the state on I-40 — about 370 miles — went from roughly $16.20 to $21.87 per crossing. A truck that runs 20,000 New Mexico miles a year was paying about $876; the same miles now cost about $1,182, an extra $306 per truck per year. Mid-weight rigs scale the same way: at 48,000 lbs the rate moved from 2.201¢ to 2.971¢ — $7.70 more per 1,000 miles.

For context on where that puts New Mexico among the five per-mile states: still well under Oregon's 25.1¢ and Connecticut's 10¢ at 80,000 lbs, now ahead of New York's 5.46¢, and about twice Kentucky's flat 2.85¢ — the full comparison is in what each state really costs per mile.

Two legitimate ways to blunt it

The one-way haul election. If a vehicle customarily runs loaded one direction and empty the other, and 45% or more of its registration-year miles are empty, a sworn application classifies it at two-thirds of the standard rate — 3.94¢ instead of 5.91¢ at the top bracket. The election existed before the increase, but the higher the schedule, the more real money it returns. If your operation qualifies and never filed for it, that's the single largest legitimate cut available.

An honest look at declared weight. The tax brackets on the declared gross weight — the highest weight the vehicle will operate at in New Mexico. The law requires declaring the highest weight you actually run, and operating above the declaration is its own violation. But the reverse costs quiet money: a declaration padded "to be safe" above anything the truck really grosses prices every mile in a bracket you never use. At 2,000-lb steps and ~35% higher rates, one unnecessary bracket is now worth more than it was in June.

Rate changes shouldn't be your job to notice

TruePermit versions every state schedule by period — your Q2 New Mexico miles price at the old rates and Q3 at the new ones automatically, alongside IFTA and the other four weight-distance states. When a legislature moves a rate, the engine updates and your next return is simply right. Free for one truck.

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This post is general information for compliance planning, not legal or tax advice. Rates and rules change; verify against tax.newmexico.gov and nmlegis.gov before filing.