New Driver? Your BAC Limit Might Be Zero

In Australia and Canada, holding a learner, novice or provisional licence comes with one non-negotiable rule: zero alcohol. Not “below 0.05%” or “just one drink.” Zero. Any measurable BAC while driving on a learner permit or P-plate is an offence — regardless of your age. The United Kingdom is the exception, and it catches people out for a different reason — see below.

Many new drivers know this in theory. Most underestimate how quickly even a small amount of alcohol can push them over a 0.00% limit.

Australia: L-Plates and P-Plates

Australia’s graduated licensing system has two stages before a full licence. The BAC rule is the same at both stages, and it’s the same across all eight states and territories:

This applies at any age. A 28-year-old who recently moved to Australia and is completing their P-plate stage has the same 0.00% limit as a 17-year-old learner. The licence stage determines the rule, not the age.

Canada: Novice Driver Rules

Each Canadian province runs its own graduated licensing program, but the zero alcohol rule for novice drivers is consistent across the country — and most provinces extend it to all drivers under 22 (under 21 in New Brunswick), whatever licence they hold:

Getting caught with any alcohol on a novice licence in Ontario means an immediate 30-day suspension, a $250–$450 fine, and an insurance rate impact that lasts for years.

United Kingdom: No Separate Learner Limit

The UK works differently, and this is widely misreported. There is no separate BAC limit for learner, provisional or newly qualified drivers in any UK nation. The general limit applies to everyone: 80 mg/100 ml (0.08%) in England, Wales and Northern Ireland, 50 mg/100 ml (0.05%) in Scotland.

What new drivers do face is the Road Traffic (New Drivers) Act 1995: six penalty points within two years of passing your test revokes the licence, and you go back to a provisional one. A drink-driving conviction carries 3–11 points plus a mandatory disqualification — so for a new driver, a single offence ends the licence outright. The limit is the same; the consequence is not.

Northern Ireland did legislate a 50 mg general limit and a 20 mg limit for novice and professional drivers in the Road Traffic (Amendment) Act (Northern Ireland) 2016, but that section has never been commenced; the Commencement No. 4 Order taking effect on 1 October 2026 covers graduated driver licensing only. England and Wales consulted on a 50 mg general limit with a lower figure for new drivers (consultation closed 11 May 2026), but nothing has been enacted as of September 2026. Alcophone therefore does not apply a zero limit to UK provisional drivers — it shows the limit that is actually in force, plus a reminder about the two-year rule.

Ireland: 0.02% Rather Than Zero

Ireland does have a separate limit for new drivers, but it is not zero. Learner permit holders, drivers within two years of the issue of their first full licence and anyone driving without a licence for the vehicle are held to 20 mg/100 ml (0.02%), against the general 50 mg/100 ml (0.05%). The two years run from the date the first full licence was issued, however long you held a learner permit before it.

Why “Just One Drink” Is a Myth Here

A standard drink raises BAC by roughly 0.02–0.03% in an average adult. For someone subject to a 0.00% limit, “one drink an hour ago” is not reliably safe. How high one drink takes you depends on body size, body composition and food, and how fast it clears varies from person to person. There is no reliable way to estimate it without a measurement.

The only number that guarantees you’re under a 0.00% limit is zero drinks. That’s the point of the rule.

How Alcophone Handles This

When you select a region in Australia or Canada, Alcophone asks whether you hold a learner, novice or provisional licence — and in Canada, whether you are under the provincial age threshold (22 in most provinces, 21 in New Brunswick), because there the zero limit follows age as well as licence stage. If either applies, it sets your legal threshold to 0.00% — meaning any BAC reading above zero triggers a warning immediately, not a green light.

In Ireland the same question sets your limit to 0.02% rather than zero. A separate switch covers driving a truck, a bus, a car towing a heavy trailer, a work vehicle or a taxi at work, where 0.02% applies to any driver for as long as they are driving it.

In the UK there is no such toggle, because there is no such limit. In the United States the zero-tolerance rule is age-based (under 21) rather than licence-based, and Alcophone is a 21+ app, so it shows the under-21 figure for reference only.

It’s one toggle in the app. One tap and the thresholds recalibrate for your actual legal situation, not the general adult limit that applies to fully licenced drivers.

Whether you’re an Australian on their P2, a Canadian G1 holder, or a UK learner — Alcophone shows you the limit that actually applies to you, not a rule of thumb.

Full limit tables by country: USA (50 states + DC) · Canada · Australia · United Kingdom · India · Ireland