What an ignition interlock costs in California
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California does not set the price at all — it sets your share of it. State law fixes how much of the provider's standard cost falls on you, by income, and makes the provider absorb the rest. For the size of that underlying bill the national figures are the reference: NHTSA puts installation at $70 to $90 and monitoring at about $70 a month, roughly $3 to $4 a day. A quote far above that is the provider's, not the state's.
Three charges make up the bill, not one: fitting the device, keeping it on the car, and taking it out at the end. Over a full term the monthly fee is the bulk of it, which is why a cheap installation on a long requirement costs more than a dearer one on a short.
What California lets a provider charge
California does not cap what a provider may charge. It regulates the other side of the bill: how much of that price falls on you. Providers are required by law to apply this schedule, and to cover the rest themselves.
| Your income | Your share of the provider’s standard program cost |
|---|---|
| Income at or below 100% of the federal poverty level | driver pays 10% |
| Income at 101–200% of the federal poverty level | driver pays 25% |
| Income at 201–300% of the federal poverty level, or receiving CalFresh | driver pays 50% |
| Income at 301–400% of the federal poverty level | driver pays 90% |
| Everyone else | driver pays 100% |
Share of the cost set by law against the driver’s income · California Vehicle Code § 23575.3(k) — fee schedule by income · effective 2019-01 · checked 2026-08-26
- The percentages are of the provider’s own standard program cost, which California does not cap. A share of an unregulated number is still an unregulated number.
- Subdivision (k)(1)(G) puts the remainder on the manufacturer, not the state — the provider absorbs whatever the driver does not pay.
- Proof required is one of: last year’s federal tax return, three months of income statements, EDD unemployment verification, or proof of CalFresh.
- Under subdivision (l) the Department of Consumer Affairs may fine a provider up to $1,000 for failing to tell a driver this schedule exists, or for not applying it.
What decides the total in California
The monthly fee matters less than how long you pay it, and that is set by the requirement rather than the provider. In California a first offense carries none for a first non-injury offense; 1 year if it caused injury; with one prior, 1 year (2 with injury); with two, 2 years (3 with injury); with three or more, 3 years The programme is run by California DMV, on the court abstract of conviction, which is also who decides whether a recorded event extends it.
That is the part worth budgeting for: events add months, and months are what the bill is made of. What counts as a violation → · All California rules and centers →
What the California term actually adds up to
California sets 12 months for a first offense, and that is the multiplier that matters. At the national reference of about $70 a month, the monitoring alone comes to about $840 over the term, before the $70-plus fitting fee and anything charged at removal.
Which is why the monthly rate decides the bill and the installation deal does not: one extra month costs more than the gap between the cheapest and dearest fitting. And the term is a floor — events recorded by the device push it further out.
If you cannot pay for it in California
California is one of the states that wrote an answer into its own rules rather than leaving it to the provider:
- Income at or below 100% of the federal poverty level — driver pays 10%
- Income at 101–200% of the federal poverty level — driver pays 25%
- Income at 201–300% of the federal poverty level, or receiving CalFresh — driver pays 50%
- Income at 301–400% of the federal poverty level — driver pays 90%
None of it is automatic. You apply through California DMV, on the court abstract of conviction, and you apply before the device goes in rather than after.
Who operates in California, and why it changes the price
8 approved networks run in California: Intoxalock (672), Smart Start (248), Low Cost Interlock (245), LifeSafer (205), ADS Interlock (51), Guardian Interlock (49), Alcolock USA (28), RoadGuard Interlock (11). Nothing here caps what any of them may charge, so the quote is the price and two quotes are worth the phone calls.
Where it is fitted in California
1,073 certified points in our index. The busiest cities:
Cost questions in California
How much does an ignition interlock cost in California?
California does not set the price at all — it sets your share of it. State law fixes how much of the provider's standard cost falls on you, by income, and makes the provider absorb the rest. For the size of that underlying bill the national figures are the reference: NHTSA puts installation at $70 to $90 and monitoring at about $70 a month, roughly $3 to $4 a day. A quote far above that is the provider's, not the state's.
Does California cap what a provider can charge?
Not as a hard ceiling. California publishes figures, but they are guidance rather than a cap, so the number tells you what is normal rather than what is forbidden. Get a second quote if yours sits well above it.
What else does California charge on top of the device?
Beyond what the provider bills, the state has its own charges: Income at or below 100% of the federal poverty level driver pays 10%; Income at 101–200% of the federal poverty level driver pays 25%; Income at 201–300% of the federal poverty level, or receiving CalFresh driver pays 50%; Income at 301–400% of the federal poverty level driver pays 90%; Everyone else driver pays 100%. These are the lines people are surprised by, because the vendor quote does not include them.
Where can I have an interlock fitted in California?
We index 1,073 certified installation points across 396 California cities. Book with a provider the state approves rather than the nearest pin on the map: time on an unapproved device does not count toward the term.