By Jordan EllisReviewed by the DUI Lawyer Toronto defence teamUpdated 6 min read
Usually not. A first DUI conviction in Ontario carries no mandatory jail sentence; the minimum penalty is a fine, starting at $1,000, along with a driving prohibition and a criminal record. Jail becomes a real possibility when there are aggravating factors, such as a very high blood alcohol reading, a collision or someone getting hurt, and a second offence brings a minimum of 30 days behind bars.
That is the short answer. The longer answer depends on the facts of your case, the charge you are facing and how your DUI lawyer approaches the evidence. Below, we explain what the Criminal Code actually requires, what can push a first offence toward custody, and what else a conviction costs you.
Is Jail Mandatory for a First DUI in Ontario?
No. The mandatory minimum penalties in section 320.19 of the Criminal Code set a floor, and for a first offence that floor is a fine, not imprisonment. The amount rises with the blood alcohol concentration (BAC) the Crown proves:
| First offence situation | Mandatory minimum |
|---|---|
| Impaired driving or over 80, BAC 80-119 mg | $1,000 fine |
| BAC 120-159 mg per 100 mL of blood | $1,500 fine |
| BAC 160 mg or more | $2,000 fine |
| Refusing a breath, blood or drug demand | $2,000 fine |
Every first offence conviction also comes with a driving prohibition of 1 to 3 years. You can see how these penalties fit together on our first offence DUI page and in our overview of DUI fines and penalties in Ontario.
A minimum is only a starting point, though. The judge can impose more than the minimum. The maximum for a first offence with no injury is up to two years less a day if the Crown proceeds summarily, or up to 10 years if it proceeds by indictment. Those maximums are rarely approached on a first offence, but they show that the law allows custody.
When Can a First Offence Lead to Jail?
Jail for a first DUI is most likely when the facts make the offence more serious than a routine case. Judges look at the whole picture, but several factors tend to matter most.
A high blood alcohol reading
The Criminal Code treats a BAC of 120 mg or more as an aggravating factor at sentencing (s. 320.22). A reading well above that level can move a case away from a fine-only outcome, particularly when combined with other concerns. If the Crown's case rests on a breath reading, that number is often where the defence looks first, which is why the reliability of the Intoxilyzer 8000C and its records matters so much in an over 80 charge.
A collision or dangerous driving
A crash, even one with only property damage, tells the court that the risk of impaired driving actually materialized. Evidence of excessive speed, weaving across lanes on the 401 or driving the wrong way can have a similar effect.
Injury or death
When someone is hurt, the charge itself changes. Impaired driving causing bodily harm carries a maximum of 14 years by indictment, and impaired driving causing death carries a maximum of life imprisonment. In these cases, jail is a serious possibility even for a person with no record.
Other circumstances
Driving while already prohibited, an unrelated criminal record or a lack of remorse can also weigh against you. On the other side, courts may consider mitigating factors such as a clean background, early acceptance of responsibility and steps taken to address alcohol use.
What Happens on a Second or Third DUI?
The answer changes sharply for repeat offences. A second offence carries a mandatory minimum of 30 days in jail, and a third or subsequent offence carries a minimum of 120 days. Once a conviction is entered for a repeat offence, those floors limit what the judge can do.
The driving prohibitions also climb: 2 to 10 years for a second offence, and at least 3 years with no maximum for a third. If you have a prior impaired driving conviction, read our pages on a second DUI offence and a third DUI offence before your first court date.
What Else Does a First DUI Conviction Cost You?
Avoiding jail does not mean avoiding serious consequences. Even a fine-only sentence brings:
- A criminal record. A DUI conviction is a criminal conviction. A record suspension from the Parole Board of Canada is only available after a waiting period that begins once your sentence is complete. Our post on how long a DUI stays on your record explains the timeline.
- Loss of your licence. A 1-year provincial suspension applies on a first conviction, in addition to the criminal driving prohibition. We break this down in will I lose my licence for a first DUI.
- Back on Track and ignition interlock. Ontario requires the Back on Track remedial program before reinstatement, and an ignition interlock condition for at least one year afterwards.
- Insurance, work and travel. Insurance becomes harder and more expensive to obtain, jobs that involve driving can be affected, and a conviction can complicate entry to the United States.
- Immigration. Because impaired driving is now "serious criminality" under immigration law, permanent residents and foreign nationals can face inadmissibility or removal. Anyone without Canadian citizenship should get immigration advice as well.
Can a Lawyer Help Keep You Out of Jail?
Yes, a lawyer can often make a meaningful difference, both in whether you are convicted and in what sentence follows. A conviction is not automatic simply because you were charged. The Crown must prove its case beyond a reasonable doubt, and the evidence is frequently open to challenge.
Common areas of review include:
- Whether the stop and the breath demands were lawful under sections 8 and 9 of the Charter.
- Whether you were told of your right to a lawyer and given a real chance to speak with one, as section 10(b) requires.
- Whether the breath instrument was properly maintained and operated, based on the disclosure.
- Whether the case has been delayed beyond the 18-month ceiling set in R. v. Jordan for the Ontario Court of Justice.
If evidence was obtained in breach of your Charter rights, a judge may exclude it under section 24(2). Where a conviction is likely, your lawyer can still present mitigating information and argue for a sentence at the lower end of the range.
Most DUI cases in the GTA are heard in the Ontario Court of Justice, whether the charge was laid by Toronto Police Service or by a regional police force. If your case is in the east end, our Scarborough DUI lawyer page explains what to expect locally.
Talk to a DUI Lawyer Before Your First Court Date
If you are facing a first impaired driving charge, the question of jail is only one part of what is at stake. Your licence, your record and your future travel all depend on how the case is handled from the start. The earlier a Toronto DUI lawyer reviews your disclosure, the more options you are likely to have.
Our team at DUI Lawyer Toronto is available 24/7. We will explain the charge, the realistic range of outcomes and the next steps in plain language.
Common questions
Is there a mandatory jail sentence for a first DUI in Ontario?
No. For a first impaired driving or over 80 conviction, the Criminal Code sets a minimum fine rather than jail. The minimum is $1,000, rising to $1,500 for a blood alcohol reading of 120 to 159 mg and $2,000 for 160 mg or more or for a refusal. A judge can still impose jail if the facts are serious, such as a collision or a very high reading.
Can I go to jail for a first DUI if nobody was hurt?
It is possible but uncommon. The maximum for a first offence without injury is up to two years less a day on summary conviction, or up to 10 years by indictment. Jail is more likely where there was a collision, dangerous driving, a very high blood alcohol reading or other aggravating facts. Each case turns on its own evidence, so a lawyer's review matters.
What is the minimum jail sentence for a second DUI in Ontario?
A second impaired driving offence carries a mandatory minimum of 30 days in jail, and a third or subsequent offence carries a minimum of 120 days. The judge cannot go below those minimums after a conviction. Repeat offences also bring longer driving prohibitions, from 2 to 10 years for a second offence and at least 3 years for a third.
Does a first DUI give me a criminal record?
Yes. A DUI conviction in Canada is a criminal conviction, even if the sentence is only a fine. The record can affect employment, insurance and travel to the United States. You can apply to the Parole Board of Canada for a record suspension, but only after a waiting period that begins when your sentence is complete: 5 years for summary conviction or 10 years for indictable.
Will pleading guilty keep me out of jail on a first offence?
A guilty plea is often treated as a mitigating factor, and many first offences end with a fine and a driving prohibition. However, pleading guilty also means a criminal record and a licence suspension, and it gives up any defence you might have. Before deciding, have a DUI lawyer review the disclosure to see whether the evidence can be challenged.
