Illinois truck permits: which one your truck needs
Illinois splits truck permits among three agencies: the Secretary of State for registration, the Department of Revenue for fuel tax, and IDOT for oversize loads. Each has its own rules, and all of them must be settled before the truck crosses the state line.
Illinois truck permits in numbers
Illinois truck permits come in three kinds. A truck without Illinois registration or Illinois on its IRP cab card needs a 72-hour trip permit. A truck without an IFTA license needs a $40, 96-hour fuel permit. A load over legal size or weight needs an IDOT permit. Buy each before entering Illinois.
Illinois sits on some of the busiest freight corridors in the country, so plenty of carriers cross it only now and then. Those are the trucks most likely to arrive with the wrong permit, or none.
This guide covers which Illinois credential each truck needs, Illinois's own size and weight limits, how IDOT oversize permits work, and what a wrong permit costs at the scale.
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Key takeaways
Registration and fuel are separate permits
The 72-hour trip permit covers registration. The 96-hour single trip permit covers fuel tax. A truck with neither credential needs both.
Buy before you enter
The Department of Revenue says fuel trip permits must be bought before entering Illinois. Oversize permits are issued online through IDOT's ITAP system before the move.
Legal height is 13 feet 6 inches
Not 14 feet. Width is 8 feet 6 inches and gross weight 80,000 pounds, subject to the bridge formula.
Length depends on the road
On Class I and II truck routes there is no overall limit for a 53-foot semitrailer combination; on non-designated roads it is 65 feet.
IDOT permits cover state roads only
Local roads, Chicago streets, Cook County limits, and the Illinois Tollway each need their own permission.
Off route means no permit
A permitted load off its route is treated as running without a permit, and the excess weight is fined.
In this articleContents
Which Illinois truck permits do you need?
The Illinois truck permits you need depend on how the truck is registered, whether it holds an IFTA license, and what it hauls. Each comes from a different agency.
| Permit | Who needs it | Who issues it |
|---|---|---|
| 72-hour trip permit | Trucks without Illinois registration or Illinois on their IRP cab card | Illinois Secretary of State |
| 96-hour single trip fuel permit | Qualified motor vehicles without an IFTA license | Department of Revenue, through permit providers |
| Oversize/overweight permit | Loads over legal width, height, length, or weight | IDOT, through ITAP |
| Local and toll road permits | Permitted loads that leave state highways | Local authorities and the Illinois Tollway |
A legal-size truck with Illinois on its IRP cab card and a current IFTA license needs no Illinois trip or fuel permit to cross. For how state permits fit with USDOT, UCR, IRP, and IFTA, see truck permits explained.
When do you need an Illinois trip permit?
You need an Illinois trip permit when a commercial truck will run in Illinois without Illinois registration, for example an apportioned truck whose IRP cab card doesn't list Illinois. Under 625 ILCS 5/3-403, the Secretary of State issues one-trip permits for a single trip, or one round trip into and out of Illinois, lasting no more than 72 consecutive hours or 3 calendar days.
The Secretary of State's rule, 92 Ill. Adm. Code 1010.740, sets the conditions:
- Permits are for occasional, short-term, or emergency use, not a substitute for registration a truck should have
- Each permit covers one trip or one round trip by one vehicle or combination, once
- The vehicle data must be filled in before the trip starts, and the permit must be used within 90 days of issue
- A trailer needs no permit of its own if the power unit's permit includes its weight
- No transfers, refunds, reclassifications, or replacements of lost permits
- Keep copies of used permits for four calendar years for audit
If a truck runs Illinois more than now and then, adding Illinois to its apportioned registration is the lasting fix. Trip permits are built for the exception, not the routine.
How does the Illinois fuel trip permit work?
A truck without an IFTA license can cover its Illinois motor fuel use tax with a single trip permit: $40, valid for 96 hours, under 35 ILCS 505/13a.5. It covers one trip into Illinois, through it, or from the border to a point inside and back.
The fee replaces the tax, the quarterly reports, and the decal and bond requirements for that trip. It applies to qualified motor vehicles as IFTA defines them: two axles and over 26,000 pounds, three or more axles at any weight, or a combination over 26,000 pounds.
The Department of Revenue says carriers buy these permits from a single trip permit provider, and that they must be bought before entering Illinois. Our guide to temporary fuel permits compares other states' versions and the most common mistakes.
What are Illinois's legal size and weight limits?
Illinois's legal limits are 8 feet 6 inches wide, 13 feet 6 inches high, and 80,000 pounds gross, but length depends on the class of highway. IDOT designates Class I and Class II truck routes; other roads are non-designated.
| Limit | Class I and II routes | Non-designated roads |
|---|---|---|
| Width | 8 ft 6 in | 8 ft 6 in |
| Height | 13 ft 6 in | 13 ft 6 in |
| Semitrailer length | 53 ft | 53 ft |
| Overall length | No limit | 65 ft |
| Kingpin to rear axle, trailers over 48 ft | 45 ft 6 in | 42 ft 6 in |
Combinations over 65 feet may leave a Class I route for one mile, or a Class I or II route for five miles onto a non-designated road, to load, unload, fuel, eat, rest, or repair, unless a sign prohibits it.
Axle and gross weight
Under 625 ILCS 5/15-111, the limits are 20,000 pounds on a single axle, 34,000 pounds on a tandem, and 80,000 pounds gross for combinations of five or more axles, with each axle group also capped by the bridge formula. Posted roads and bridges can carry lower limits.
How do Illinois oversize and overweight permits work?
A load over legal size or weight on a state highway needs a special permit from IDOT's Permit Office, ordered online through ITAP, the Illinois Transportation Automated Permits system. IDOT says most permits are issued immediately. Permits are discretionary and only for loads that can't reasonably be dismantled.
Have these ready: single or round trip, a load description, the loaded dimensions, the plate and state of the hauling unit, axle weights and spacings if overweight, the entry and exit points or addresses, and a USDOT number for interstate moves.
Fees for oversize loads
| Load up to | First 90 miles | Over 270 miles |
|---|---|---|
| 10 ft wide, 14 ft 6 in high, 70 ft long | $12 | $21 |
| 12 ft wide, 14 ft 6 in high, 85 ft long | $15 | $30 |
| 14 ft wide, 15 ft high, 100 ft long | $25 | $40 |
| 18 ft wide, 16 ft high, 120 ft long | $30 | $60 |
Overweight fees rise with weight in 45-mile bands under 625 ILCS 5/15-306 and 15-307, and Illinois State Police escorts are billed on top. Card payments in ITAP carry a 2.25% convenience fee.
When a permitted load may move
| Permitted load | When it may move |
|---|---|
| Overweight only, legal dimensions | 24 hours a day, 7 days a week |
| Up to 12 ft wide, 13 ft 6 in high, 200 ft long | 24/7, with one extra civilian escort after dark |
| Up to 14 ft 6 in wide, 15 ft high, 200 ft long | Half an hour before sunrise to half an hour after sunset, 7 days |
| Up to 16 ft wide, 17 ft high | Daylight Monday to Friday, Saturday until noon |
| Over 16 ft wide or 17 ft high | 9 a.m. to 3 p.m., Monday to Friday |
Escorts, signs, and limits beyond state roads
- Escorts: one civilian escort over 14 ft 6 in wide or high, or over 110 ft long; two if a load exceeds two of those; three over 16 ft wide, 18 ft high, or 145 ft long; Illinois State Police over 18 ft wide or high or 200 ft long
- Signs and lights: OVERSIZE LOAD signs front and rear over 10 ft wide, 14 ft 6 in high, or 75 ft long, red flags on the extremities, and an amber light on every permitted load
- Insurance: $500,000 per occurrence for escort vehicles and loads over 10 ft wide, 13 ft 6 in high, 110 ft long, or overweight
- Cook County: loads over 12 ft wide, 13 ft 6 in high, or 120,000 lbs are barred from most Cook County expressways
- Other roads: IDOT permits cover state highways only. Chicago streets, county and township roads, and the Illinois Tollway each need their own permission before the move
Carry the permit and the OPER 993 provisions in the truck; IDOT accepts electronic copies. ITAP also posts temporary restrictions, so check it before every move. Our oversize load permit guide covers planning a move across several states.
What happens if your Illinois permit is wrong?
A wrong Illinois permit turns a routine stop into a fine based on every excess pound. Under 625 ILCS 5/15-112, any police officer who believes a truck is overweight can weigh it on portable or fixed scales, or send it to the nearest certified scale, and hold it until the excess is removed.
Overweight without a permit
The fines in 625 ILCS 5/15-113 climb fast: $100 up to 2,000 pounds over, $520 at 3,001 to 3,500, $950 at 4,501 to 5,000, and above 5,000 pounds, $1,500 plus $150 for each extra 500 pounds. By that schedule, 6,000 pounds over is $1,800. A fourth conviction in 12 months adds $5,000.
Outside the permit's terms
- Over the permitted weight: a violation of permit plus a per-pound fine on the excess, up to 25 cents a pound past 5,000 pounds (625 ILCS 5/15-113.3)
- Wrong plate, axles, dimensions, or axle spacings off by 12 inches or more: a violation of permit; fix the load or buy a new permit before continuing
- Off the permitted route or outside its dates: treated as running with no permit at all
- A permit that doesn't cover the move: at least 10 cents a pound for every pound over the legal gross weight (625 ILCS 5/15-113.1)
- A divisible load or a fake permit: the permit is void, and a fraudulent permit is a Class 4 felony
Keep every Illinois permit with the rest of the truck's credentials. Our guide to keeping your permit book current covers what rides in the cab.
How Simplex helps with Illinois permits
One truck can need a different mix of Illinois credentials on every trip. We help sort it out before dispatch.
Trip and fuel permits
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.
Your own IFTA license
Running Illinois often? Our IFTA permits service can set up the license that replaces fuel trip permits.
Frequently asked questions
Do I need both an Illinois trip permit and a fuel permit?+
How much is an Illinois fuel trip permit?+
Can I buy an Illinois permit after I cross the state line?+
What is the legal truck height in Illinois?+
Where do I get an Illinois oversize permit?+
Where this information comes from
The requirements below come from the Illinois Vehicle Code, Illinois administrative rules, the Illinois Department of Revenue, and IDOT, checked on October 19, 2026.
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1
Illinois General Assembly — 625 ILCS 5/3-403
One-trip registration permits for up to 72 consecutive hours or 3 calendar days.
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2
Illinois Administrative Code — 92 Ill. Adm. Code 1010.740
Who can use a trip permit, the 90-day use window, no transfers or refunds, and 4-year record keeping.
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3
Illinois General Assembly — 35 ILCS 505/13a.5
The $40, 96-hour single trip permit in lieu of motor fuel use tax credentials.
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4
Illinois Department of Revenue — Motor Fuel Use Tax Single Trip Permits
Permits are bought from providers and must be purchased before entering Illinois.
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5
IDOT — OPER 753, Maximum Legal Dimensions and Weights
Legal width, height, length, and axle weights by highway class.
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6
IDOT — OPER 993, Special Vehicle Movement Permit Provisions
Movement hours, escorts, signs, Cook County and Tollway limits, and permit violations.
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7
Illinois General Assembly — 625 ILCS 5/15-305
IDOT permit fees for legal-weight, overdimension loads.
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8
Illinois General Assembly — 625 ILCS 5/15-113
The overweight fine schedule and fines for size violations.
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 Illinois before the truck reaches the line
Illinois doesn't sell its way out of a missing permit at the border. Registration, fuel tax, and oversize permits all have to be in place before the first Illinois mile.
If you want a second check on which Illinois permits your trucks and loads need, talk to our team.