Missouri hardship license requires IID installation in most DUI cases. Installation runs $70–$150, monitoring $60–$90/month, and removal $50–$100—totaling $500–$800 for a 6-month minimum period.
What IID Installation, Monitoring, and Removal Cost on a Missouri Hardship License
Installation fees for ignition interlock devices in Missouri range from $70 to $150, monthly monitoring runs $60 to $90, and removal costs $50 to $100. For a first-offense DUI hardship license with a 6-month minimum IID requirement, total cost reaches $500 to $800 before accounting for calibration visits or violation resets. Second or subsequent offenses require 12 months minimum, pushing total IID cost to $850 to $1,300.
Missouri courts mandate IID as a condition of the Limited Driving Privilege (the state's term for hardship license) in nearly all DUI cases, regardless of BAC level or prior record. The device must remain installed for the entire court-ordered period, and any failed breath test or circumvention attempt resets the clock to zero. Monthly monitoring fees compound faster than most drivers expect because the minimum period is longer than neighboring states.
Estimates based on state-approved provider pricing as of current Missouri DOR requirements; individual costs vary by provider, county, and violation complexity. Installation and removal fees are one-time charges. Monthly monitoring is the recurring cost that determines total spending.
Why Missouri Hardship Licenses Require IID Even for First-Time DUI
Missouri law requires IID installation on any Limited Driving Privilege granted after a DUI arrest, including first offenses with BAC under 0.15%. Missouri Revised Statutes 302.309 ties IID to the privilege itself, not the offense severity. If you're granted a hardship license to drive to work after a DUI, the device is mandatory.
This differs from most states, where first-offense DUI with low BAC may allow restricted driving without IID. Missouri eliminated that discretion in 2016. Court and DMV align: the privilege exists only if IID is installed and monitored. Refusal to install the device forfeits the privilege entirely.
The 6-month minimum for first offense applies from the date the device is installed and calibrated, not the date the privilege is granted. Any failed test, missed calibration, or tampering alert resets the 6-month clock. Second offense minimum jumps to 12 months, and third or subsequent offenses require 24 months minimum.
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How Monthly Monitoring Fees Add Up Over Court-Mandated Periods
Monthly monitoring fees cover data downloads, calibration visits (typically every 30–60 days), and reporting to the Missouri Department of Revenue and court. Providers charge $60 to $90 per month depending on device type, reporting frequency, and county. Most contracts require payment in advance for the full monitoring period.
For a 6-month first-offense requirement, monthly fees alone total $360 to $540. Add installation ($70–$150) and removal ($50–$100), and total cost reaches $480 to $790. For a 12-month second-offense period, monthly fees climb to $720 to $1,080, with total device cost hitting $840 to $1,330.
Calibration visits are included in the monthly fee but require you to drive to the provider location during approved hardship hours. Missing a scheduled calibration triggers a violation alert sent to the court and DOR. Most violations add 30 to 90 days to the required period, which increases total cost by $60 to $270 depending on the extension length.
IID Cost Stacks on Top of SR-22 Premium and Hardship License Fees
The IID device is one cost layer among several. Missouri requires SR-22 filing for the entire Limited Driving Privilege period and typically 2 years beyond license reinstatement. SR-22 insurance for drivers with DUI runs $100 to $200 per month for state-minimum liability coverage—$600 to $1,200 over a 6-month hardship period.
Hardship license application fee is $45 (petition filing) plus $20 (Limited Driving Privilege issuance). Reinstatement fee after the suspension period ends is $45. Court costs, DUI program fees, and attorney fees (if you hire one for the hardship hearing) add $1,000 to $3,000 depending on county and legal complexity.
Total cost to drive legally during a first-offense DUI suspension with 6-month IID and SR-22 typically reaches $2,500 to $5,000. That breaks down as: IID installation and monitoring ($500–$800), SR-22 insurance premium ($600–$1,200), court and reinstatement fees ($1,100–$1,500), and DUI program ($200–$500). Budget for the full stack before applying for the privilege.
Choosing an IID Provider: State-Approved Vendors and Contract Terms
Missouri maintains a list of approved IID providers on the Department of Revenue website. Only devices from approved vendors satisfy court and DOR requirements. Common providers include Intoxalock, Smart Start, LifeSafer, and Monitech. Installation networks vary by region—urban counties have multiple locations, rural counties may require driving 30+ miles.
Providers charge similar base fees but differ on contract terms. Some require full prepayment for the monitoring period, others allow monthly billing. Cancellation policies vary: if you remove the device before the court-mandated period ends, you forfeit the privilege and typically owe the remaining contract balance. Read the service agreement before signing.
Device features are standardized—all Missouri-approved units test breath alcohol before engine start and require rolling retests while driving. Camera-equipped models (required in some states) are optional in Missouri but cost $10 to $20 more per month. Providers cannot waive fees or shorten the monitoring period; those terms are set by court order and statute.
What Happens If You Miss a Calibration or Fail a Breath Test
Missed calibration appointments, failed breath tests above 0.025% BAC, or circumvention attempts trigger violation reports sent to the court and Missouri DOR within 48 hours. The court may extend the IID requirement by 30 to 90 days per violation, and repeat violations can result in privilege revocation and return to full suspension.
Each violation extends the monitoring period, which increases total cost. A single 30-day extension adds $60 to $90 in monthly fees. Three violations over a 6-month period can extend the requirement to 9 or 10 months, increasing total IID cost from $500 to $750+. Violations also reset eligibility for full license reinstatement, delaying the end of SR-22 filing.
Providers charge lockout override fees ($50 to $75) if the device enters permanent lockout due to repeated failures. The only path forward is court petition to modify the order or wait out the full suspension period without driving. Most judges do not reduce IID periods after violations—they extend them.
When IID Requirement Ends and How Removal Works
The IID requirement ends only when the court-mandated period is complete and verified by the provider's final report to the DOR. You cannot remove the device early, even if you stop driving or surrender the hardship license. Early removal is treated as a violation and extends the period.
Once the period ends, schedule removal with the same provider who installed the device. Removal fees run $50 to $100 and include final data download and compliance certificate sent to the court and DOR. The certificate is required for full license reinstatement. Most providers complete removal within 1 to 3 business days of final period verification.
SR-22 filing continues after IID removal. Missouri typically requires 2 years of SR-22 from the reinstatement date, not the privilege grant date. If you completed a 6-month IID period during suspension, expect SR-22 to remain in place for 2 years after full reinstatement, which extends total high-risk insurance cost well beyond the device period.
