You're required to file SR-22 after a DUI in Montana, but the state doesn't mandate collision or comprehensive coverage. Here's how to decide whether liability-only meets your needs or full coverage is worth the cost.
Montana SR-22 Filing Requires Liability Coverage Only
Montana's SR-22 filing requirement mandates proof of liability coverage at state minimum limits: $25,000 bodily injury per person, $50,000 per accident, and $20,000 property damage. The state does not require collision or comprehensive coverage to satisfy SR-22 compliance, even after a DUI conviction.
Your SR-22 filing obligation in Montana typically lasts 3 years from your license reinstatement date, not from your conviction date. If you let your liability policy lapse even one day during this period, your insurer cancels the SR-22 filing electronically with the Motor Vehicle Division, your license suspends immediately, and the 3-year clock resets to zero when you refile.
Liability-only coverage for DUI-SR-22 drivers in Montana runs $140–$260/month through non-standard carriers like The General, Dairyland, and Bristol West. Full coverage with collision and comprehensive adds $80–$180/month depending on your vehicle's value and your deductible selections. Estimates based on available industry data; individual rates vary by conviction class, prior violations, and county.
When Your Lender Requires Full Coverage Regardless of SR-22 Rules
If you financed or leased your vehicle, your loan or lease agreement requires collision and comprehensive coverage regardless of what Montana's SR-22 rules permit. This lender mandate applies whether you financed the vehicle before or after your DUI conviction.
Most drivers who carry a loan assume they can drop to liability-only after a DUI to save money during the SR-22 period. Your lender will send a force-placed insurance notice within 30–45 days of detecting the coverage gap, and force-placed policies cost 2–4 times standard comprehensive premiums while providing no liability protection. You remain responsible for your original loan payment plus the force-placed premium.
If you own your vehicle outright with no lien, you control the collision and comprehensive decision entirely. Montana does not mandate physical damage coverage for SR-22 compliance, and no state authority will penalize you for carrying liability-only on a paid-off vehicle.
Find out exactly how long SR-22 is required in your state
Liability-Only Makes Sense If Your Vehicle Value Is Low
Collision and comprehensive coverage pays to repair or replace your vehicle after an accident, theft, weather damage, or vandalism. If your vehicle is worth less than $4,000, the annual cost of full coverage often exceeds 25–40% of the vehicle's actual cash value, making liability-only the rational financial choice.
Use this test: multiply your monthly full-coverage premium by 12, then add your collision and comprehensive deductibles (typically $500–$1,000 each). If that total exceeds half your vehicle's current value, you're effectively self-insuring at a lower cost by carrying liability-only and banking the premium difference.
Montana DUI-SR-22 drivers with older vehicles — 2010 models or earlier with over 120,000 miles — typically see collision/comprehensive premiums of $60–$140/month. If your vehicle is worth $3,500, you'll pay $720–$1,680 annually to insure an asset that depreciates faster than your premium protects it.
Full Coverage Protects You If You Cause Another Accident During SR-22
A second at-fault accident during your SR-22 filing period creates compounding consequences. Montana requires SR-22 for 3 years after a DUI, but a second incident — even a minor property-damage collision — extends your high-risk classification and may trigger a second SR-22 filing requirement if your license suspends again.
Liability-only coverage pays for damage you cause to other vehicles and injuries to other people, but it pays nothing to repair your own vehicle. If you're at fault and carry only liability, you'll pay out-of-pocket to replace your vehicle while still owing your SR-22 premium for the remaining filing period with no car to drive.
Collision coverage pays to repair your vehicle after an at-fault accident minus your deductible, regardless of fault determination. For drivers commuting daily to work or managing restricted license conditions in Montana, losing your vehicle creates a second crisis on top of your existing SR-22 obligation. Full coverage for $80–$140/month often costs less than replacing a $6,000 vehicle after a single mistake.
How Aggravated DUI and Repeat Offenses Change the Calculation
Montana distinguishes between first-offense DUI (BAC 0.08–0.15 with no aggravating factors), aggravated DUI (BAC 0.16+, refusal, minor in vehicle, or injury), and repeat-offense DUI. Aggravated and repeat convictions extend SR-22 filing periods to 5 years in some cases and move you into the highest-risk tier for non-standard carriers.
Carriers price aggravated DUI and repeat offenses 30–60% higher than first-offense standard DUI. If you're already paying $220/month for liability-only SR-22 coverage after an aggravated conviction, adding collision and comprehensive might cost $140–$200/month rather than the $80–$120 range for first-offense drivers. Your total monthly obligation reaches $360–$420 for full coverage.
Drivers in this category who own vehicles outright often choose liability-only during the SR-22 period, then add collision and comprehensive after the filing obligation ends and they can transition back to standard or preferred-risk carriers at lower rates. That strategy only works if you can absorb the financial risk of replacing your vehicle out-of-pocket during the 3–5 year SR-22 window.
Non-Standard Carriers in Montana That Write DUI-SR-22 Policies
Most mainstream carriers — State Farm, Geico, Allstate, Progressive — will file SR-22 for existing Montana customers after a DUI but typically non-renew the policy at the end of the current term. New DUI-SR-22 policies require the non-standard market.
Bristol West, Dairyland, The General, and GAINSCO write DUI-SR-22 coverage in Montana and offer both liability-only and full-coverage options. Acceptance Insurance and National General also provide SR-22 filing but availability varies by county. Not all non-standard carriers offer collision and comprehensive — some write liability-only SR-22 policies exclusively, which eliminates the coverage choice entirely if that's your only acceptance.
Quote at least three non-standard carriers before deciding between liability-only and full coverage. Rate spreads for DUI-SR-22 drivers in Montana range 40–70% between the lowest and highest quotes for identical coverage limits. One carrier may price liability-only at $160/month and full coverage at $340/month, while another offers liability at $180/month and full coverage at $280/month, reversing the value calculation completely.
Switching from Liability-Only to Full Coverage Mid-SR-22 Period
You can add collision and comprehensive coverage to an existing liability-only SR-22 policy at any point during your Montana filing period. Your SR-22 filing remains active and continuous as long as you maintain at least state minimum liability limits without a lapse.
Adding physical damage coverage mid-term does not reset your SR-22 clock or trigger a new filing fee. Your carrier adjusts your premium, and the SR-22 on file with Montana MVD continues uninterrupted. Most non-standard carriers allow coverage upgrades with 24–48 hours notice and no underwriting review if you've maintained continuous liability coverage.
If you start with liability-only to minimize cost immediately after your DUI, then secure stable income or pay down your vehicle loan, upgrading to full coverage later protects you without restarting your SR-22 compliance timeline. The reverse is also true: you can drop collision and comprehensive and return to liability-only during your SR-22 period, though your lender's requirements override this option if you carry a loan.
