United States
Environmental Protection
Agency
Office of Transportation and Air Quality
EPA-420-B-17-001
January 2017
Filing Vehicle and Engine Declarations by
Original Equipment Manufacturers (OEMs)
EPA Declaration Form 3520-1 covers the importation of light-duty motor vehicles (including on-
highway motorcycles, disassembled vehicles, kit cars, light-duty vehicle/on-highway motorcycle
engines)
For light-duty motor vehicles that ARE covered by an EPA Certificate of Conformity
•	EPA Declarations Form 3520-1 is not required to be filled out or filed with Customs
and Border Protection (CBP) for light-duty motor vehicles that are imported by their
OEM, and are new and are covered by an EPA certificate of conformity and bear an
EPA emissions control label.
•	EPA Declarations Form 3520-1 is not required to filled out or filed with CBP for non-
chassis mounted engines to be used in a light-duty vehicle or a light-duty truck or
motorcycle which are currently covered by an EPA certificate of conformity or will
be covered by an EPA certificate prior to introduction to commerce ONLY if they are
imported by their OEM.
For light-duty motor vehicles that are NOT covered by an EPA Certificate of Conformity
•	EPA Declarations Form 3520-1 is required to be filed with CBP for light-duty motor
vehicles that are imported, owned, and controlled directly by an OEM for all other
exemptions covered by 3520-1.
EPA Declaration Form 3520-21 covers the importation of stationary, nonroad or heavy-duty engines
including engines incorporated into vehicles or equipment.
On December 27, 2016, CBP issued a final rulemaking (81 FR 94974) to include a provision which
aligns the exemption from filing 3520-21 for OEMs who are importing their own certified and
labeled products with the same exemption allowed for OEMs for form 3520-1. Therefore, for
stationary, nonroad or heavy-duty engines including engines incorporated into vehicles or
equipment that ARE covered by an EPA Certificate of Conformity
•	EPA Declarations Form 3520-21 is not required to be filled out or filed with CBP for
stationary, nonroad or heavy-duty engines including engines incorporated into
vehicles or equipment that are imported by their OEM, and are new and are
covered by an EPA certificate of conformity and bear an EPA emissions control label.
For stationary, nonroad or heavy-duty engines including engines incorporated into vehicles or
equipment that are NOT covered by an EPA Certificate of Conformity

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January 2017
• EPA Declarations Form 3520-21 is required to be filed with CBP for stationary,
nonroad or heavy-duty engines including engines incorporated into vehicles or
equipment for all other exemptions covered by 3520-21.
The EPA declarations forms are required to be submitted to CBP as applicable. EPA does not require
that either of the declaration forms ever be submitted to EPA except upon request. More information
on EPA's imports policies and procedures, including the declaration forms, can be found on EPA's web
site at: http://www.epa.gov/otaq/imports/forms-resources.htm.
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