What Speed Emission Coupons Are and Who Can Use Them

A Speed Emission Coupon in Missouri is a document that lets you skip your vehicle's emissions test for one year if you meet certain conditions. You do not take a test at a certified emissions station — instead, you mail or deliver the coupon to the Missouri Department of Revenue along with your vehicle registration renewal. The coupon itself proves you have complied with emissions requirements for that year.

You can use a Speed Emission Coupon if your vehicle is registered in Missouri and you received one in the mail from the state. The state sends these coupons to vehicle owners who have passed emissions tests in previous years and whose vehicles are considered low-risk for emissions violations. Not every vehicle owner receives one, and you cannot request one — the state determines who gets them based on their testing history.

The coupon is valid for one registration year only. If you use it, you will not need to visit an emissions testing station that year, but you will still need to renew your vehicle registration with the Missouri Department of Revenue.

Key Takeaways

  • Speed Emission Coupons are mailed by Missouri to vehicle owners with clean emissions histories and allow you to skip testing for one year.
  • You use the coupon by submitting it with your vehicle registration renewal to the Missouri Department of Revenue.
  • The coupon is only valid for the registration year printed on it and cannot be transferred to another vehicle or person.
  • If you do not receive a coupon, you must take your vehicle to a certified emissions testing station as part of your regular registration renewal.
  • Losing or not using your coupon does not affect your ability to renew your registration — you straightforward take the standard emissions test instead.

How to Use Your Speed Emission Coupon

When you receive your vehicle registration renewal notice from Missouri, check whether a Speed Emission Coupon is included in the packet. The coupon will show your vehicle's VIN, license plate number, and the year it is valid for. If the coupon is there and the information matches your vehicle, you can use it.

To use the coupon, include it with your registration renewal payment when you submit your renewal to the Missouri Department of Revenue. You can renew online, by mail, or in person at a license office. If you renew online, you will enter information about the coupon during the process. If you renew by mail or in person, include the physical coupon with your renewal documents. Do not take your vehicle to an emissions testing station that year — the coupon replaces that requirement.

Keep a copy of your renewal confirmation for your records. Once the state processes your renewal with the coupon, you will receive your new registration documents, and your emissions requirement for that year is satisfied.

When You Cannot Use a Speed Emission Coupon

Even if you have a coupon, you cannot use it if the vehicle information on the coupon does not match your current registration. This can happen if you have changed your address, sold the vehicle, or transferred ownership. If the coupon shows a different VIN or license plate than your current vehicle, it is not valid for your renewal.

You also cannot use a coupon from a previous year. Each coupon is printed with a specific registration year, and using an expired coupon will not satisfy your emissions requirement. If you did not use a coupon in a prior year and still have it, you will need to take a standard emissions test instead.

If you lose your coupon before submitting your renewal, contact the Missouri Department of Revenue to ask whether a replacement can be issued. However, it is often faster to straightforward schedule an emissions test at a certified station rather than wait for replacement paperwork. You have until your registration expires to complete either the test or submit the coupon.

What Happens If You Do Not Use Your Coupon

If you receive a Speed Emission Coupon but choose not to use it, you must take your vehicle to a certified emissions testing station before your registration expires. The coupon is optional — using it is a convenience, not a requirement. Some vehicle owners prefer to test anyway to have a current emissions record, or they may not realize they have a coupon.

Failing to either use the coupon or complete an emissions test before your registration expires will result in an expired registration. You cannot legally drive the vehicle until you renew your registration and satisfy the emissions requirement. If you are stopped by law enforcement, an expired registration can result in a traffic citation.

If you discover after your registration has expired that you had a coupon, you cannot use it retroactively. You will need to renew your registration and take an emissions test to bring your vehicle into compliance.

Certified Emissions Testing Stations in Missouri

If you do not have a Speed Emission Coupon or cannot use the one you received, you will need to visit a certified emissions testing station. Missouri's Department of Natural Resources maintains a list of all certified stations on its website. You can search by county or city to find stations near you.

Emissions tests in Missouri check your vehicle's exhaust system and onboard diagnostic equipment to may support it meets state pollution standards. The test takes about 30 minutes and costs a fee set by the testing station — prices vary but typically range from $15 to $25. You will need your vehicle keys and registration documents when you arrive.

Once you pass the test, the station will provide you with a passing certificate or will electronically report the result to the Missouri Department of Revenue. You can then renew your registration without a coupon. If your vehicle fails the test, you will receive information about what repairs are needed and can retest after repairs are completed.

Emissions Testing Requirements by Vehicle Age and Type

Not all vehicles in Missouri are required to have emissions tests. The state exempts vehicles that are 25 model years old or older from emissions testing entirely. This means if your vehicle was manufactured in 2000 or earlier (as of 2025), you do not need a Speed Emission Coupon or a test — you can renew your registration without any emissions documentation.

Diesel vehicles and vehicles registered as antiques or classics may have different testing requirements. Hybrid and electric vehicles are also subject to different rules. When you receive your registration renewal notice, it will indicate whether your vehicle requires emissions testing that year. If no testing is required, your renewal notice will not include a coupon, and you will not need to arrange a test.

If you are unsure whether your vehicle is subject to testing, check your registration renewal notice or contact the Missouri Department of Revenue directly. They can tell you based on your vehicle's model year and type.

Frequently Asked Questions

Can I use someone else's Speed Emission Coupon for my vehicle?

No. The coupon is tied to a specific vehicle's VIN and license plate number. Using a coupon issued to another vehicle will not satisfy your emissions requirement and may delay your registration renewal. Each vehicle owner receives coupons only for their own registered vehicles.

What if my vehicle fails an emissions test after I already used my coupon?

If you used a coupon and your vehicle later fails an emissions test (for example, if you are tested by law enforcement or during a roadside inspection), you will need to have repairs made and retest. The coupon only satisfies your annual registration requirement — it does not prevent your vehicle from being tested at other times or may provide it will pass if tested.

Do I need to renew my registration before I can use my Speed Emission Coupon?

No. You use the coupon as part of your registration renewal process, not before it. When your registration renewal notice arrives, include the coupon with your renewal payment and documents. The coupon and renewal go together.

Can I transfer my Speed Emission Coupon to a new vehicle if I buy one?

No. Coupons are vehicle-specific and cannot be transferred. If you sell your vehicle or buy a new one, any unused coupons for the old vehicle are no longer valid. Your new vehicle will have its own emissions history with the state, and you may or may not receive coupons for it in future years.

What should I do if I lost my Speed Emission Coupon?

Contact the Missouri Department of Revenue to report the loss. They may be able to issue a replacement or provide documentation that you received one. If replacement takes time, schedule an emissions test at a certified station instead — this is often faster than waiting for replacement paperwork and will satisfy your requirement either way.