EPA Form 3520-1: Importation Codes, Filing, and Penalties

EPA Form 3520-1 is the emission declaration you file with U.S. Customs and Border Protection for almost every motor vehicle brought into the United States. The Environmental Protection Agency uses it to confirm that your car, truck, motorcycle, or light-duty engine either meets Clean Air Act standards or qualifies for a specific exemption. Get the form wrong and your vehicle can be held at the port, exported at your expense, or destroyed, with civil penalties currently reaching $59,114 per violation.¹

Which Vehicles Need Form 3520-1

The form is required for each passenger car, light-duty truck, highway motorcycle, disassembled vehicle, kit car, and light-duty vehicle or motorcycle engine entering the country.² The organizing idea is highway use in a light-duty weight class.

One narrow group is exempt from filing: brand-new vehicles imported by their original manufacturer, covered by a valid EPA certificate of conformity, and already bearing an EPA emission control label.³ That covers automakers shipping new inventory to their U.S. dealers. Everyone else files.

Heavy-duty highway engines, off-road equipment, ATVs, snowmobiles, and stationary engines use a different declaration, EPA Form 3520-21, not this one.⁴ If your vehicle sits near the line between light-duty and heavy-duty, its weight rating and engine configuration decide which form is correct.

What to Gather Before You File

Have the paperwork on the desk before you start. The core identifier is the seventeen-character Vehicle Identification Number, which federal rules require to be readable through the windshield on the driver’s side of passenger vehicles.⁵ You also need the engine family name or serial number, the make, model, model year, and the date and country of manufacture.

Whoever signs the form is the Importer of Record and carries full legal responsibility for the accuracy of the declaration and the vehicle’s compliance status. If the vehicle owner is someone other than the importer, both parties’ contact details go on the form. A valid physical address for the vehicle’s final U.S. destination is required so the EPA can conduct follow-up inspections.

The form itself is a downloadable PDF from the EPA’s publications page.⁶ A licensed customs broker can also provide and file it for you.

Choosing the Right Importation Code

The most consequential decision on Form 3520-1 is the letter code. Each code tells CBP and the EPA the legal basis on which your vehicle is entering, and each code carries its own documentation requirements. Pick the wrong one and CBP can hold the shipment or open an enforcement file.

Vehicles That Already Meet U.S. Standards

Code B is the cleanest path. It applies to vehicles originally manufactured to comply with U.S. EPA emission standards and carrying a U.S. emission control label in the engine compartment or on the motorcycle frame.⁷ If you’re bringing back a U.S.-spec vehicle that was previously exported or bought abroad, this is usually your code.

Codes EE and FF cover vehicles identical in all material respects to a U.S.-certified version, most often Canadian-market cars. Code EE is for personal use and needs proof of Canadian origin, such as a Canadian emission label or a letter from the manufacturer’s U.S. representative. Code FF covers Canadian-identical models on the EPA’s approved list imported for resale or lease, with the importer taking on labeling, warranty, and fuel economy obligations.⁷

Non-Conforming Vehicles Through an ICI

A vehicle that doesn’t meet U.S. emission standards and doesn’t qualify for an exemption has to come in through an Independent Commercial Importer, a company with EPA credentials to modify, test, and certify specific makes and models for U.S. compliance.⁸ The applicable codes are A, C, J, and Z:

Code A: the ICI holds a valid EPA certificate of conformity for the specific make, model, and model year and will modify the vehicle to match.
Code C: the ICI will modify and test the vehicle under a separate regulatory pathway, and the vehicle must be at least six years old.
Code J: the ICI is importing the vehicle for pre-certification testing, has 180 days to obtain the certificate or export the vehicle, and must post a customs bond.
Code Z: the ICI will modify the vehicle to be identical to an OEM-certified U.S. version using written instructions from the original manufacturer.

The conditional admission period for completing ICI modifications is 120 days from the date of entry.⁹ ICI authority is limited to specific makes and models, so finding one that handles your particular vehicle matters before you ship.

Age-Based Exemptions

Code E covers vehicles at least 21 years old, calculated by subtracting the calendar year of manufacture from the year of importation. These vehicles are exempt or excluded from EPA emission requirements as long as they remain in their original, unmodified configuration.⁷ This is the standard code for most classic and collector imports.

Read the age carefully. The EPA’s 21-year emission threshold is not the same as the DOT’s 25-year safety threshold. A 22-year-old vehicle clears EPA but still has to satisfy federal safety standards. Each form has to reflect the correct exemption status on its own terms.

Temporary and Personal-Use Imports

Code O covers vehicles imported by a nonresident for personal use for up to one year, with an EPA letter of approval attached and no resale in the U.S.⁷ Code M handles miscellaneous situations, including Canadians permanently emigrating to the U.S., inherited vehicles, and EPA hardship approvals.

Other temporary codes cover import for repair, testing, or display. Code G, for example, allows entry for repair or alteration but prohibits registering, licensing, or driving the vehicle on public roads, and it requires a customs bond and an EPA approval letter. The EPA recommends bonding for at least the vehicle’s full value.⁷

The DOT Companion Form You Also Need

Form 3520-1 does not travel alone. Every vehicle import also requires DOT Form HS-7, the safety, bumper, and theft prevention declaration administered by NHTSA. Both forms go to CBP at the time of entry.²¹⁰

DOT has its own compliance route for non-conforming vehicles, using a DOT Registered Importer rather than an ICI. Vehicles at least 25 years old are exempt from DOT safety standards entirely.¹¹ The four-year gap between the EPA’s 21-year cutoff and the DOT’s 25-year cutoff is where private importers often trip up.

Submitting the Form to CBP

The completed form is presented to CBP at the port of entry when the vehicle arrives. Many importers now file through the Automated Commercial Environment, CBP’s electronic trade processing system, which the EPA’s publications page points filers toward.⁶ Whether on paper or electronic, transmit the declaration before or at the time the vehicle physically arrives.

Miss the window and there are consequences. If the required EPA declaration form is not submitted within 60 days of entry, CBP issues a notice of inadmissibility for the vehicle.³ Keep a signed copy and all supporting documentation. General CBP record-retention rules require importers to hold these records for five years from the date of entry, and agents can audit the import anywhere in that window.

Penalties for Getting It Wrong

The Clean Air Act sets civil penalties of up to $25,000 per non-conforming vehicle imported in violation of emission requirements, with each vehicle counting as a separate offense.¹² After mandatory inflation adjustments, that figure now stands at $59,114 per violation.¹ Individual importers who aren’t manufacturers or dealers face a lower penalty tier, though still a serious one.

A vehicle conditionally admitted that isn’t brought into compliance or granted final admission within the 120-day conditional period is treated as unlawfully imported unless it’s delivered to customs for export or other disposition.⁹ A vehicle denied admission will not be released in any way that could let it reach a consumer in non-conforming condition, so the realistic outcomes are export at your expense or destruction.³ Falsifying information on the form compounds the exposure and can invite criminal referral on top of the civil penalty.

1
eCFR. 40 CFR 19.4 – Adjustment of Civil Monetary Penalties for Inflation
2
U.S. Customs and Border Protection. Vehicle – How Can I Obtain EPA Form 3520-1 and DOT Form HS-7
3
eCFR. 19 CFR 12.73 – Importation of Motor Vehicles and Motor Vehicle Engines
4
Environmental Protection Agency. EPA Form 3520-21 – Importation of Engines, Vehicles, and Equipment
5
eCFR. 49 CFR Part 565 – Vehicle Identification Number (VIN) Requirements
6
U.S. Environmental Protection Agency. Publications and Forms for Importing Vehicles and Engines
7
Environmental Protection Agency. EPA Form 3520-1 – Importation of Motor Vehicles and Motor Vehicle Engines
8
U.S. Environmental Protection Agency. Independent Commercial Importers (ICIs)
9
eCFR. 40 CFR Part 85 Subpart P – Importation of Motor Vehicles and Motor Vehicle Engines
10
U.S. Customs and Border Protection. Importing a Motor Vehicle
11
National Highway Traffic Safety Administration. Importation and Certification FAQs
12
Office of the Law Revision Counsel. 42 USC 7524 – Civil Penalties