Montana single-trip oversize permit fee
$10 OS; OW $10 / $30 / $50 + axle/25 mi
Those are the general Montana single-trip oversize/overweight permit rates. The total depends on the route. We do not calculate routes. We publish what the state publishes.
Official 2026 handbook: “Trip Oversize $ 10.00.”
MCA 61-10-125(1), single-trip overweight that is over gross allowable but does not exceed axle limits: “the department of transportation shall charge for distances traveled: (a) $10 for distances up to and including 100 miles; (b) $30 for distances from 101 to 199 miles; and (c) $50 for distances 200 miles and over.”
MCA 61-10-125(4), loads that exceed axle limits — calculated cost of 25 miles of travel:
| Total excess axle weight (lb) | Cost of 25 miles of travel |
|---|---|
| 5,000 | $3.50 |
| 10,000 | $7.00 |
| 15,000 | $10.50 |
| 20,000 | $14.00 |
| 25,000 | $17.50 |
| 30,000 | $21.00 |
| 35,000 | $24.50 |
| 40,000 | $28.00 |
| 45,000 | $31.50 |
| 50,000 | $35.00 |
| 55,000 | $38.50 |
| 60,000 | $42.00 |
| 65,000 | $45.50 |
| 70,000 | $49.00 |
| 75,000 | $52.50 |
| 80,000 | $56.00 |
| 85,000 | $59.50 |
| 90,000 | $63.00 |
| 95,000 | $66.50 |
| 100,000 | $70.00 |
| over 100,000 | $70.00 + $3.50 per 5,000 lb or part of 5,000 lb over 100,000 |
Statute: “mileage must be rounded off in units of 25 miles and mileage in excess of a 25-mile increment must be assessed at the next higher 25-mile increment.” Weight rounds the same way in 5,000-pound increments.
Example, not a quote: 80 assumed miles, overweight on gross only (not axle), is the printed $10 band (up to and including 100 miles). Example, not a quote: 100 assumed miles at the printed $3.50 per 25 miles on 5,000 excess axle pounds is 4 × $3.50 = $14.00. The desk runs its own miles. We do not take origin or destination.
When this number took effect
Source
Nearby states: Idaho, North Dakota, South Dakota, Wyoming
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