How to run your own numbers on a telematics trial before you commit

A telematics trial is worth joining when the guaranteed sign-up discount, plus the average renewal result weighted by how likely each outcome is, beats both what you would pay without the program and what a flat low-mileage discount would save. You can estimate all three before you install anything, using four inputs: your current price, the sign-up discount, the odds of each renewal outcome, and the size of the worst one.

The weak point is the third input. Insurers publish discount ceilings readily and outcome odds rarely, so most of this method is about getting those odds from the carrier, or from the public numbers that do exist, and checking them against how your household really drives.

What you are actually weighing

A trial has a certain part and an uncertain part, and mixing them up is the commonest error.

• The certain part. Most programs give a discount just for enrolling. As of November 2026, State Farm's Drive Safe & Save page describes a "10% initial participation decrease," provided you complete setup. Progressive's Snapshot page says there is an automatic discount at sign-up, credited on the first policy period, which "expires when you renew." Nationwide's SmartRide page offers an instant discount that lasts "until a driving behavior discount can be calculated, which could be zero."
• The uncertain part. At renewal the sign-up discount is replaced by a rate based on your driving. That can be lower than the sign-up discount, equal to no program at all, or higher, depending on whether the program can charge more. Progressive's page says "your rate may increase with high-risk driving"; State Farm's says the adjustment "may increase or decrease at each renewal"; Nationwide describes SmartRide as a discount program.
• The non-dollar part. You give the insurer trip data. That is a cost even though it has no price tag, and a later section treats it as a deliberate line in the decision.

Notice that "up to 30%" or "up to 40%" is not an input. Those are the best results the program can produce. They tell you the size of the prize, not your chance of winning it.

Step 1: Record a baseline before you enroll

You cannot judge a trial against a household you have not measured. Spend two to four weeks collecting a few numbers. Nothing here needs special equipment.

1. Mileage. Photograph the odometer on a fixed day each week. Multiply the weekly average by 52 for a first estimate of annual mileage. Low mileage matters because some programs price on it directly; State Farm's page notes that a low-mileage reduction for drivers under 7,500 miles a year can turn into a higher premium if actual driving exceeds that.
2. Trip times. Write down every trip that starts between 10 p.m. and 5 a.m., and separately any between midnight and 5 a.m. Nationwide's page defines night driving as midnight to 5 a.m.; Progressive's page singles out late-night weekend trips. Late trips are the behavior most households underestimate.
3. Braking and acceleration. Programs measure hard braking and acceleration. You will not match their thresholds, which are not published, but you can learn your pattern: how often you brake hard at a particular intersection, how much of your driving is stop-and-go. Nationwide's page says it tracks idle time, which may indicate congested traffic, so a commute through slow traffic is worth noting.
4. Phone handling. GEICO's DriveEasy page says the app measures how hard you brake, how fast you go around corners and how often you use your phone, and it does not block phone use. Count how often you touch the screen while moving, and who else uses your phone in the car. State Farm's FAQ says a passenger using the recording phone can be flagged as phone distraction.
5. Who drives what. List every driver on the policy and what share of the household's miles each one drives. GEICO's page says all enrolled drivers need to participate.

Keep the notes in one place. You will use them twice: to decide whether to enroll, and to judge the program's score if you do.

Step 2: Ask the carrier four questions, in writing

Ask by email or chat so you have the answer on record. Agents often know the discount but not the distribution, so be ready to ask for a supervisor or the underwriting contact.

1. What is my sign-up discount, in dollars, and how long does it last? Ask whether it is guaranteed for the first term if you finish setup, and what happens to it if you drop out early. State Farm's page says the initial discount depends on completing setup. Progressive's app terms say that if you opt out within 45 days of enrolling, your Snapshot experience is not considered at all; after 45 days without enough data for a score, you may get a surcharge or lose a discount in some states.
2. Can my renewal price go up because of the score, and what is the maximum increase? Get a number or a cap, or an answer that there is none.
3. What share of participants get a decrease, no change and an increase at renewal? Progressive's page says only about 2 out of 10 drivers actually get an increase. That is a participation-wide figure, not a promise for you, but it is the kind of figure to ask other insurers for.
4. When is my score computed, and for how long does it apply? Programs vary. Nationwide says its program lasts about four to six months and the discount stays while you insure with the company. State Farm's page says the adjustment is recalculated at each renewal, typically every six months, using up to the prior 12 months of data.

If the carrier will not provide odds, use public ones as a floor of realism. The Maryland Insurance Administration's July 2025 telematics report found that, of 263,703 policies in telematics programs at 16 insurers during 2023 renewals, 31.16% had a decrease from the telematics adjustment, 23.6% had an increase, and 45.24% had no change. The agency cautions that the "no change" group is inflated, because some 2023 enrollments had not yet reached a renewal. These are Maryland numbers across many programs, not any one insurer's odds.

Step 3: Compute the break-even

The method needs only arithmetic. Define each outcome as a change relative to what you would pay at renewal with no program, so that a sign-up discount that lapses counts as "no change" and not as a loss.

Say your annual premium without a program is $2,000. These numbers are invented for the example and are not market data.

• Guaranteed sign-up discount: 5%, or $100, for the first policy term.
• Renewal outcomes, relative to the no-program price: 30% chance of a 15% decrease ($300 saved), 45% chance of no change ($0), 25% chance of a 10% increase ($200 more).

Expected renewal effect. Multiply each outcome by its probability and add:

0.30 x (-$300) + 0.45 x $0 + 0.25 x (+$200) = -$90 + $0 + $50 = -$40

So on average the renewal result saves $40 a year. Over the first term plus one renewal term, the expected saving is $100 + $40 = $140.

Scenarios, over two terms.

The average is positive, but a quarter of households in this example finish behind. If the program were discount-only, the bottom row would read +$100 and the average would rise, which is why the "can my rate rise?" question carries so much weight.

The break-even probability. Hold the good-score chance at 30% and the size of each outcome fixed. The renewal effect equals zero when the chance of an increase reaches 45% (the no-change group would shrink to 25% to make room): 0.30 x $300 = $90 saved, and $90 / $200 = 45% needed to cancel it. If the chance of an increase in this example climbed toward 45%, the program would be worth only the sign-up discount. Run the same calculation with your carrier's real percentages and caps, and the car insurance quote comparison worksheet tool can hold the results beside your other quotes.

Step 4: Compare it with a flat low-mileage discount

If your baseline shows you drive little, a flat mileage-based discount can beat a behavior program on risk alone. A flat discount has no score to fail.

Using the same $2,000 premium, say your insurer offers an 8% low-mileage discount for driving under a set number of miles. That is $160 a year, or $320 over two years, with no renewal gamble. Against it the trial example above averaged $140 over two years, with a range from -$100 to +$400. On average the flat discount wins; the trial wins only if you believe your chance of a good score is higher than the 30% assumed.

Three practical points apply:

• Check whether they combine. Some insurers let you hold a mileage discount and enroll in a behavior program; State Farm's Drive Safe & Save formula already folds annual mileage into the adjustment. Ask rather than adding the two.
• Check how mileage is verified. A flat discount may rely on a stated estimate, an odometer reading or a device. Some programs, State Farm's among them in some states, require an odometer reading before renewal. The low-mileage discounts: how insurers reward driving less guide and pay-per-mile car insurance: how the pricing works cover verification, and pay-per-mile, low-mileage discount or telematics: which fits? compares all three approaches side by side. The pay-per-mile break-even calculator handles the per-mile product.
• Check which fits your drivers. A low-mileage household that brakes hard through city traffic is a candidate for the flat discount; a high-mileage household that rarely drives at night and glides on the highway is where behavior scoring can pay.

Step 5: Fit it to who drives in the household

A score is only as useful as its match to the people being scored. Review these before you enroll.

• Every driver is in. GEICO says all enrolled drivers need to participate. The Maryland report found that where only one driver or vehicle opts in, most insurers average the participants' scores with a neutral score for the others. A single high-risk driver, such as a teenager, can therefore move the whole policy's number. See telematics in households with several drivers: who is scored?.
• Phones are shared. If a spouse tends to hold or use the driver's phone, the app may log distraction. State Farm's FAQ says a passenger using the recording phone can trigger it. If your household shares phones, the in-app corrections described in when a driving app scores a trip wrong: how to dispute it become part of the cost.
• Night and shift work. A household member working nights will be scored on that driving.
• The car. Nationwide's page notes a plug-in device may be recommended if a vehicle was already enrolled in another usage-based program, and that a connected car may already have earned a discount. Ask about duplication before installing anything.
• Where you drive. Progressive's app terms say "where you drive is not used in determining your personalized rate," though location may be used for other purposes such as accident detection. Check whether that holds for the program you are considering.

Step 6: Set the calendar reminders

Most losses in a trial come from missed dates, not bad driving. Put these in your calendar the day you enroll.

1. Day 30 after enrollment: confirm every driver has completed setup. Nationwide's page says the app must be activated by all drivers within 30 days of the policy effective date and stay active for 80 days. State Farm's FAQ says that if setup is not completed in time, the discount is removed back to the date it was added.
2. Day 40: decide whether to stay. Under Progressive's terms, leaving within 45 days means your Snapshot experience is not considered.
3. Monitoring end date: note when the scoring period closes. After that date, new driving may not change the result.
4. 60 days before renewal: look up your renewal price and ask for the telematics part of it. Use the renewal rate increase checker to separate the program's effect from general rate changes. The Maryland report counts a rise in the telematics factor as an increase "despite" the total premium falling for other reasons, so ask which part of the change is the program.
5. The week after renewal: compare the new declarations page with the old one and with the numbers you wrote down.

If you live in Maryland, an insurer must give 45 days' written notice of a premium increase, and for one based on a telematics program the agency says the notice must state the percentage attributable to the program and list the behaviors measured (Bulletin 24-26). Other states have their own rules, so check with your state department of insurance.

Counting the data as a cost

The trial's price is not only the premium. Progressive's Snapshot privacy statement says device data is deleted from the device once sent but that the company retains it indefinitely, and its app terms list underwriting, servicing, marketing, research and claims among the uses. GEICO's page says it never sells or shares driving data with third parties. The Consumer Federation of America, in an August 2025 analysis, argued that most enrolled drivers do not save and that data protections are thin.

You do not need to settle that argument, only to decide whether the expected saving is worth it to you. If the expected saving in your calculation is small, say under $50 a year, the data is probably the larger consideration. The what driving apps collect and how insurers use it guide covers what the apps collect.

Common questions

Should I trust the "average savings" number on the insurer's page?

Treat it as a ceiling or an average across everyone, not as your result. Progressive's page quotes averages of $164 at sign-up and $328 at completion, but nothing about your driving. Plug in your own probabilities from step 2 instead.

What if the carrier will not tell me the odds of an increase?

Ask for the maximum increase instead, and use the Maryland shares as a rough prior. Also ask whether the program is discount-only. If neither answer is available, assume the worst case when you compute the break-even.

Can I leave the trial early without a penalty?

It depends on the program and the state. Progressive's terms say leaving within 45 days means your Snapshot experience is not considered, but leaving later without enough data may bring a surcharge or loss of a discount in some states. Read the exit terms before you start, and see leaving a telematics program: what happens to your data and discount.

Do I need the plug-in device or the app?

Compare both if offered. Progressive's page says the app is the only option that considers phone use, and that the plug-in device connects to the OBD-II port. Choose based on your baseline: if you handle your phone often, a device-only scoring method may look better, but check whether it is available in your state.

Key takeaways

• Treat the sign-up discount as certain and the renewal result as a probability, measured against the price you would pay without the program.
• Record two to four weeks of mileage, late-night trips, braking and phone use before enrolling so you can judge the score.
• Ask the carrier, in writing, whether the rate can rise, by how much at most, and what share of participants get each outcome. Maryland's 2023 data (31% down, 24% up, 45% no change) is a public benchmark, not your odds.
• Compare the expected saving with a flat low-mileage discount, which carries no score risk.
• Calendar the setup deadline, the early-exit window, the end of monitoring and the renewal date, and count the data you give up as a cost.