California Ignition Interlock (IID): Rules, Durations, and How Insurance Fits In

If a California DUI means you need an ignition interlock device (IID), here's the reassuring part: for many first-time offenders, an IID is the fastest way to keep driving anywhere while you handle everything else. Under California's IID law (SB 1046, in effect since January 1, 2019), an IID — a small breathalyzer wired to your car's ignition — is required for 1 to 3 years depending on the offense, and for a first DUI with no injury it's optional. This page explains the durations, the difference between an IID-restricted and a regular restricted license, what it costs, and how it works alongside your SR-22 insurance.

We help California drivers pair their SR-22 filing with IID situations every day, so this reflects the real questions people ask us.

TL;DR: Under SB 1046, IID duration is optional (~6 months) for a first DUI with no injury, 1 year for a first-with-injury or second offense, 2 years for a third, and 3 years for a fourth. An IID-restricted license lets you drive anywhere; a non-IID restricted license limits you to work and your DUI program. You'll also need an SR-22 on file — the IID and the SR-22 are separate requirements that run in parallel.

What is an ignition interlock device?

An IID is a breathalyzer connected to your vehicle's ignition. Before the car starts, you provide a breath sample; if alcohol is detected above the set limit, the car won't start. The device also requests periodic "rolling retests" while you drive and logs results, which are reported to the DMV and monitoring authorities. It's installed and serviced by a state-approved provider. Historically California reserved the IID mainly for repeat offenders; since SB 1046 took effect in January 2019, first-time offenders can choose to install one to keep driving throughout their suspension period rather than wait it out.

IID durations by offense (SB 1046)

Offense	IID requirement
1st DUI, no injury	Optional — ~6-month IID gets you an IID-restricted license (drive anywhere) vs. a ~12-month non-IID restricted license (work/program only)
1st DUI with injury	1 year
2nd DUI	1 year
3rd DUI	2 years
4th or subsequent DUI	3 years

For a first DUI without injury, the choice is yours: install an IID for about six months and drive anywhere, or accept a longer restricted license limited to essential trips. Many drivers choose the IID for the freedom it restores.

IID-restricted vs. regular restricted license

This distinction trips people up, so here's the plain-English version:

• IID-restricted license: you install an IID and can drive anywhere, for any purpose, as long as the device is in your vehicle. For a first no-injury DUI, this is typically the ~6-month path.
• Non-IID restricted license: without an IID, a first-DUI restricted license generally limits you to driving to and from work and your DUI program for about 12 months.

Both paths require you to have filed an SR-22 and enrolled in your DUI program first. See our SR-22 for a first DUI in California page for how these pieces line up for first offenders.

What an IID costs

IID pricing comes from the state-approved installer, not the DMV, and generally includes:

• Installation fee (a one-time charge).
• Monthly monitoring/lease fee for the duration of your requirement.
• Periodic calibration/service visits.

Costs vary by provider and region, and income-based fee reductions are available for eligible drivers, so it's worth asking your installer. We can't quote IID pricing — that's the installer's role — but we make the insurance side simple.

How the IID and your SR-22 insurance work together

The IID and the SR-22 are two separate requirements that usually run at the same time:

• The IID is a device requirement, arranged with a state-approved installer, that lets you (or requires you to) drive with the interlock.
• The SR-22 is a certificate of financial responsibility your insurer files with the DMV to prove you carry at least California's 30/60/15 minimum liability coverage. You typically keep it active for three years; a lapse triggers an SR-26 and can re-suspend you.

You generally need the SR-22 on file to obtain the restricted or IID-restricted license in the first place. In other words, the IID gets you driving, and the SR-22 keeps you legal to drive. For how this fits the overall DUI timeline, see our SR-22 after a DUI in California and California license reinstatement pages.

Does an IID raise your insurance? Not directly — insurers price on your record (the DUI itself), not on the presence of a device. What raises cost is the high-risk classification after a DUI, which is exactly why comparing carriers matters. As an independent agency, we shop multiple high-risk insurers to find you the lowest rate you qualify for.

Frequently asked questions

Is an IID required for a first DUI in California? For a first DUI with no injury, an IID is optional. Installing one for about six months earns an IID-restricted license that lets you drive anywhere; skipping it means a restricted license limited to work and your DUI program for about a year.

How long do I need an IID in California? Under SB 1046: optional (~6 months) for a first no-injury DUI, 1 year for a first-with-injury or second offense, 2 years for a third, and 3 years for a fourth or subsequent DUI.

Does an ignition interlock raise my insurance rates? Not directly — insurers rate on your driving record (the DUI), not on the device itself. The high-risk classification after a DUI is what affects your premium, so it pays to compare carriers.

Do I need both an IID and an SR-22? Often yes. They're separate requirements: the IID is a device installed in your car, and the SR-22 is an insurance filing with the DMV. You typically need the SR-22 on file to get an IID-restricted or restricted license.

Who installs the IID and sets the cost? A state-approved IID provider installs and services the device and sets the price (installation plus monthly monitoring). Income-based fee reductions may be available for eligible drivers.

This page is general information, not legal advice. IID rules, durations, and costs can change — verify your specific requirements with the California DMV, the courts, or a qualified attorney. Woodward Agency is a licensed independent insurance agency (CA Department of Insurance License #6013015), not the DMV or an IID provider.