How California DUI license suspension actually works
California DUI license suspension is two separate processes that run in parallel: the DMV Administrative Per Se (APS) action triggered by the arrest, and the court action triggered by conviction. Most people do not realize these are independent. You can win the criminal case and still lose your license through the DMV. You can lose the criminal case and have the DMV suspension already running concurrent with whatever the court orders. The interaction between the two paths determines your real-world driving status.
The APS action is the more time-critical of the two. The arresting officer takes your physical license and issues a pink "Notice of Suspension" that doubles as a 30-day temporary license. Under Vehicle Code 13353.2 and 13558, you have ten calendar days from the arrest to request a DMV hearing to challenge the suspension. If you do not request the hearing in that window, the suspension automatically goes into effect on the 31st day after arrest. There is no later opportunity. This 10-day rule is the single most consequential deadline in any California DUI case.
What the actual suspension lengths are
For a first DUI offense with a BAC of 0.08% or higher, the APS suspension is four months. After 30 days of no-driving (the "hard suspension"), most drivers can apply for a restricted license that allows driving to and from work and to the DUI program. That restricted license requires SR-22 financial responsibility insurance, enrollment in a DUI program, and in most cases, installation of an ignition interlock device under Vehicle Code 23575.3.
For a first-offense refusal (you refused chemical testing under Vehicle Code 23612), the suspension is one full year with no restricted license available for the entire year. Refusal cases have the harshest suspension framework in California DUI law and are why prosecutors and DMV hearing officers take refusal allegations seriously.
For a second DUI within 10 years, the APS suspension is one year. For a third, it is two years. For a fourth or more, it is three years. Each priorable offense (including wet reckless under VC 23103.5) counts toward this 10-year window.
If you are under 21, the zero-tolerance law in Vehicle Code 23136 applies: any detectable alcohol (0.01% or higher) triggers a one-year suspension. The under-21 framework is harsher than the adult standard because the legal threshold is essentially zero.
How a restricted license changes the math
The restricted license is the practical difference between a suspended license you cannot use and one you can use to keep your job. For first offenses, after the 30-day no-driving period, most drivers qualify for an ignition interlock device (IID) restricted license that allows driving anywhere as long as the IID is installed. This option under Vehicle Code 23575.3 has become the standard since 2019, replacing the older "to and from work" restricted licenses for most drivers.
The IID restricted license requires: a working IID installed in any vehicle you drive, SR-22 insurance filed by your insurer with the DMV, enrollment in an approved alcohol program (3-month for under 0.15% BAC, 9-month for 0.15% or higher, 18-month or 30-month for repeat offenders), and a reissue fee. The total cost adds up: IID installation runs $60 to $150, monthly monitoring is $60 to $80, SR-22 adds $300 to $1,500 per year to insurance, and the DUI program is $500 to $2,000.
For refusal cases, the restricted license framework is more restrictive. A first refusal is a hard one-year suspension. There is no IID restricted license available during the suspension period for refusals. This is one reason defense counsel often litigates refusal allegations aggressively at the DMV hearing.
The DMV hearing matters more than most people think
The DMV hearing is the only opportunity to challenge the APS suspension before it takes effect. The hearing is conducted by a DMV employee (a "hearing officer"), not a judge. The standard of proof is "preponderance of the evidence" rather than the criminal "beyond reasonable doubt" standard. The DMV must prove three things: that the officer had reasonable cause to believe you were driving under the influence, that you were lawfully arrested, and that you had a BAC of 0.08% or higher (or refused testing).
Each of those three elements is a battleground. The stop can be challenged on Fourth Amendment grounds. The arrest can be challenged on probable cause grounds. The BAC can be challenged through Title 17 violations in breath testing, rising BAC arguments, or partition ratio issues. Refusal allegations can be challenged through Trombetta admonishment problems, language barrier issues, or medical inability to complete the test.
Winning the DMV hearing means the APS suspension is set aside. You keep your license while the criminal case proceeds. The criminal court can still impose a license suspension if you are convicted, but that is a separate process and typically a shorter period than the APS would have been. Losing the DMV hearing means the suspension goes into effect immediately. There is a limited right to appeal but the appellate process is slow and rarely changes the result.
What the calculator estimates and what it does not
This calculator estimates the suspension length, restricted license timeline, and IID requirements based on the facts you enter. It is informational only. The actual outcome depends on facts not visible here: the contents of the police report and DUI investigation report, the specific DMV hearing officer assigned, the strength of the chemical test documentation, and whether you are represented by counsel at the hearing.
The free written report we email back walks through your specific factors, gives you a calibrated estimate of the suspension length, explains the restricted license timeline, and tells you what concrete steps to take. If you are still inside the 10-day window, that is the single most important action item.