Smog Check for Registration Renewal: When It's Due and When It Isn't

Your DMV renewal notice tells you whether you need a smog check. That's the answer. Not your county, not what your last car needed, not what a coworker said. If the notice asks for a smog certificate, get one. If it doesn't, don't.

I know that sounds dismissive of the question. It isn't. The reason people get this wrong is that they try to reason it out from the general rule, and the general rule has enough exceptions that reasoning from it produces the wrong answer maybe a third of the time. So read the notice first, then read this to understand why it says what it says.

The basic rule: every other year

California's Smog Check Program is biennial. Registration renews annually, but the smog requirement comes around every other renewal. Test this year, skip next year, test the year after.

It runs in 34 of California's 58 counties, which covers essentially all of urban and suburban California. Some counties are partial, covered only in certain ZIP codes.

Here's what trips people up about "every other year": the cycle is tied to the vehicle, not to the calendar. It doesn't reset because you moved, and it doesn't reset because you got a new plate. If you bought a car mid-cycle from someone who had it tested last spring, your first renewal might not need a test at all. The DMV is tracking the vehicle's record, not your ownership of it.

Why the notice is the authority

The DMV knows things you don't. It knows the vehicle's inspection history, whether the last test was a pass or a gross polluter result, whether BAR has flagged the vehicle as a directed vehicle, and where the cycle currently sits.

Your notice reflects all of that. It'll tell you three things worth reading carefully:

• Whether a smog certificate is required at all
• Whether you're required to go to a STAR station specifically
• The fee breakdown, including the smog abatement fee if your car is inside the 8 year exemption

That STAR line matters. Most people don't need a STAR station. You only need one if the notice says so, or if the vehicle is a gross polluter or a directed vehicle. BAR directs vehicles that have a high statistical probability of failing. If your notice doesn't mention STAR, any licensed station will do, and you shouldn't pay extra for a certification tier you don't need. There's more on that in our post on STAR stations versus regular smog check stations.

The 90 day certificate window, and why testing early is a waste

A smog certificate is valid for 90 days. The station transmits it electronically to the DMV, and you keep the printed Vehicle Inspection Report as your receipt.

Ninety days is generous, but it's not forever, and every year people get ahead of themselves. They see the renewal notice arrive, feel productive, and go get tested that afternoon. Then registration isn't due for another four months, the certificate expires, and they pay for a second test.

Don't do that. Get tested inside the 90 day window before your registration expires. There's no advantage to being early, and there's a real financial penalty for being too early. At a statewide average of about $68 for the inspection plus the $8.25 certificate fee, an unnecessary second test costs you around $74 for nothing.

The 8 model year exemption

Gasoline and hybrid vehicles that are 8 model years old or newer skip the renewal test. In 2026 that means 2019 and newer, and it means 2018 model year vehicles are getting their first renewal test this year.

Instead of testing, those vehicles pay a smog abatement fee with registration: $20 per year for roughly the first six model years, $25 per year for model years seven and eight. It's on the renewal notice as a line item, and it's annual, unlike the test.

One more time, because it comes up constantly: hybrids and plug-in hybrids are not exempt on their own merits. They're exempt only if they're inside that 8 year window, exactly like any gasoline car. Battery electric vehicles are permanently exempt.

Change of ownership is a separate trigger

Renewal is not the only thing that triggers a smog requirement. A change of ownership triggers one too, with its own, much shorter exemption window.

At a sale or transfer, vehicles 4 model years old and newer are exempt. For 2026 transfers, that's model years 2023 through 2026. Everything older needs a valid certificate, and on a private-party sale the seller is legally responsible for providing it. If no test is due, the buyer pays an $8 smog transfer fee at the DMV.

The overlap is where people get caught. A 2020 car is exempt from the renewal test but needs a smog for a sale. Its owner may never have had it tested, so the sale is the first time they've dealt with any of this, and they find out three days before the buyer's deposit clears.

Dealers have to provide a certificate issued within the past 90 days, so on a dealer purchase this isn't your problem. On a private sale, whichever side you're on, it's worth pulling the vehicle's smog check history by plate or VIN to see what's actually on record.

Out-of-state and newly registered vehicles

If you're bringing a vehicle into California and registering it here for the first time, it needs a smog check as part of that initial registration, unless it falls into a permanent exemption category (1975 or older gas, 1997 or older diesel, EV, motorcycle) or is inside the 4 model year new-vehicle window.

This catches people moving from states with no emissions testing. Your car has never been tested in its life, it runs fine, and California wants a certificate before it'll issue plates. Get the test before you're standing at a DMV counter with an appointment you waited three weeks for.

Once registered, the vehicle joins the normal biennial cycle.

What happens if you renew late

Registration doesn't quietly wait for you. California charges late fees that escalate with how far past the expiration date you are, and those are separate from anything smog-related. Driving on expired registration is its own citation.

The smog side of a late renewal is simpler than people fear: the requirement doesn't get worse, and the fee doesn't go up. You still need the same certificate. But you can't complete the renewal without it, so a failed test in the middle of a late renewal means you're accruing late fees while you sort out repairs. That's the actual cost of procrastinating here.

If your car does fail, don't assume you're stuck paying twice. There's no state-mandated free retest, but plenty of stations offer one within a set window as their own policy. Ask before you hand over a card. Our post on what to do after a failed smog check covers the retest question and the Consumer Assistance Program repair funding.

The short version

Read the notice. If it asks for a certificate, get tested within 90 days of your expiration date, at any licensed station unless the notice specifically says STAR. Compare prices first, because the same inspection ranges from about $30 to $90 depending on where you pull in, and you can find stations near you in a couple of minutes. The only number that's identical everywhere is the $8.25 state certificate fee, and you only pay that if you pass.