How Much Does It Cost to Add a Teen to Car Insurance?

Cost example updated October 24, 2026

What those words mean, in plain words

Premium is the price you pay for the policy, usually quoted per month or per year. Liability-only coverage pays for injury and damage to other people and their property when the driver is at fault; it does not pay to repair your own car. Full coverage is liability plus collision (damage to your own car in a crash) and comprehensive (damage from things other than a crash, like theft, hail, or hitting an animal). A deductible is the amount you pay first on a claim before the insurer pays the rest. When this page says "added cost," it means the increase in the parents' premium after the teen is listed, nothing else.

How the added cost varies by age

The youngest drivers cost the most to add, and the added cost falls each year. CarInsurance.com averages for the added cost, full coverage, by the teen's age:

• Age 16: $4,050 a year (about $338 a month)
• Age 17: $3,740 a year (about $312 a month)
• Age 18: $3,478 a year (about $290 a month)
• Age 19: $3,105 a year (about $259 a month)

The drop from 16 to 19 is $945 a year ($4,050 minus $3,105). In other words, the first year on the policy is typically the most expensive added year, and the added line usually eases as the teen builds a driving record.

Son or daughter: what the published averages show

On a parent's policy, CarInsurance.com averages show a son costing more to add than a daughter of the same age. These are monthly added-cost averages:

• Age 16: son $350 a month, daughter $325 a month, a $25-a-month gap
• Age 17: son $323 a month, daughter $300 a month, a $23-a-month gap

As a cross-check, the age-16 pair averages to $337.50 a month, or $4,050 a year, exactly the published age-16 added average above. Some states do not allow pricing by gender, so this gap does not apply everywhere. Where it does apply, it reflects published crash and claim patterns for each group, not any judgment about an individual teen.

Full coverage or liability-only for the teen

Insurify quote averages for a teen on a parent's policy show how much the coverage choice moves the teen's share of the bill:

• Daughter on a parent's policy: $129 a month liability-only, $226 a month full coverage, a $97-a-month gap, or $1,164 a year
• Son on a parent's policy: $152 a month liability-only, $266 a month full coverage, a $114-a-month gap, or $1,368 a year

That is the teen's share on the family policy in Insurify's quote data, not a before-and-after increase for one family, and the two studies measure different things, which is why their numbers are not identical. The trade is straightforward to state: liability-only costs less each month but does not pay to repair your own car, while full coverage costs more and does. Families also find that a car with a loan usually has to carry full coverage, because the lender requires it, that is a loan rule, not a Driveonomics recommendation.

A worked family example: before and after adding the teen

Inputs, stated plainly so the math can be checked: the parents' premium before adding the teen is $2,400 a year ($200 a month), an illustrative round example, not a published average. The added cost uses the two published averages from the top of this page: $3,435 a year (Insurify) and $3,594 a year (CarInsurance.com). Nothing else is added in this example: no new car, no gas, no upkeep, this page is only the insurance line.

• Before: $2,400 a year, or $200 a month
• Added (Insurify average): $3,435 a year, or about $286 a month → after: $5,835 a year, or about $486 a month
• Added (CarInsurance.com average): $3,594 a year, or about $300 a month → after: $5,994 a year, or about $500 a month

So in this example the household bill roughly doubles and a bit more: $5,835 is about 2.4 times $2,400, and $5,994 is about 2.5 times $2,400. With a different starting premium the multiple changes, the added dollars are the part to carry into your own quote, not the multiple. Published totals also vary a lot by carrier: CarInsurance.com's carrier table shows total annual policies with a teen ranging from $2,441 to $4,872 across the carriers listed, which is why two families with the same teen can get very different quotes.

Formula

The added cost is the increase in the parents premium after the teen is listed, nothing else. Two separate studies land in the same narrow range: CarInsurance.com puts the average added cost at $3,594 a year, or about $300 a month, and Insurify puts it at about $3,435 a year, or about $286 a month, a rise of about 90% on the household bill. That is the added line only, not the family whole bill and not the teen whole first-year driving bill.

By age, CarInsurance.com averages for the added cost with full coverage: age 16 $4,050 a year, about $338 a month; age 17 $3,740 a year, about $312 a month; age 18 $3,478 a year, about $290 a month; age 19 $3,105 a year, about $259 a month. The drop from 16 to 19 is $4,050 minus $3,105, which is $945 a year. By gender at 16, a son averages $350 a month and a daughter $325 a month, a $25 a month gap; at 17, $323 against $300, a $23 a month gap. The age-16 pair averages to $337.50 a month, or $4,050 a year, exactly the published age-16 added average.

The worked family example starts from a parents premium of $2,400 a year, or $200 a month, an illustrative round example, not a published average. With the Insurify added average, $2,400 plus $3,435 is $5,835 a year, or about $486 a month. With the CarInsurance.com added average, $2,400 plus $3,594 is $5,994 a year, or about $500 a month. In this example $5,835 is about 2.4 times $2,400, and $5,994 is about 2.5 times $2,400. With a different starting premium the multiple changes, so the added dollars are the part to carry into your own quote, not the multiple.

Coverage choice moves the teen share on the family policy in Insurify quote averages: a daughter $129 a month liability-only against $226 a month full coverage, a $97 a month gap, or $1,164 a year; a son $152 a month liability-only against $266 a month full coverage, a $114 a month gap, or $1,368 a year. Discount illustrations are worked from published percentages only: a good-student discount of 8% to 20% is about $288 to about $719 a year on the $3,594 added average, and a driver-education discount of 5% is about $180 a year, if the discount applied to the full added amount, which it may not.

Why teens cost more to insure, in neutral terms

Insurers price a new driver on the pattern for their age group, because the teen has no driving record of their own yet. The pattern behind the price is experience, not character. Federal safety data summarized by the CDC show that drivers ages 16 to 19 have a fatal crash rate nearly three times that of drivers age 20 and older, per mile driven, and that a 16-year-old's crash rate per mile is about one and a half times that of an 18- or 19-year-old. The first months of independent driving carry the highest risk, and the risk eases as experience builds, the same shape as the price table above, where the added cost falls every year from 16 to 19. That is the whole explanation for the added line: more crashes per mile in the group means more claims, and the premium reflects the group's claim pattern until the individual teen builds a record of their own.

What actually lowers the added cost

Published discounts and choices that move the added line, described here, not prescribed. What any family qualifies for depends on its own insurer's rules, and discount percentages apply to the premium under that insurer's rules, not automatically to the whole added amount.

• Good-student discount: 8% to 20% in CarInsurance.com's guide, with an average of about 12% reported from CarInsurance.com's 2026 report. As an illustration only, 8% of the $3,594 added average is about $288 a year, and 20% is about $719 a year, if the discount applied to the full added amount, which it may not.
• Driver-education discount: 5% to 20% in Insurify's under-25 discount table, for completing an insurer-approved driver-education course. As an illustration only, 5% of $3,594 is about $180 a year.
• Student-away discount: 5% to 35% in CarInsurance.com's guide, when a teen is away at school (typically 100 miles or more) without a car.
• Telematics (a driving app or device that scores driving): 10% to 40% in Insurify's under-25 table. Some programs can also raise a rate if the driving scores poorly, so the range runs both ways.
• The car the teen is listed on: published guides note that an older, lower-value sedan generally costs less to insure for a teen than a high-powered car, and that a car old enough to carry liability-only costs less than one carrying full coverage.
• Comparing carriers: the carrier table above shows total policies with a teen spanning $2,441 to $4,872 a year, so the same household can see very different quotes from different insurers.

One timing note: with a learner's permit, many insurers cover the teen under the parents' policy at no extra charge, but rules vary by insurer and state. Once the teen is licensed, insurers generally require licensed drivers in the household to be listed. Families check this with their own insurer rather than assuming it.

Where the numbers stop: gaps stated honestly

Three gaps are worth stating rather than papering over. First, there is no single published national before-and-after figure for adding a teen on liability-only coverage alone, the liability-only figures above are Insurify's quote averages for the teen's share on a parent's policy, not an added-increase split, so this page does not present one as if it were. Second, discount dollars on this page are illustrations worked from published percentages, not promises: the percentage an insurer applies, and what it applies to, varies. Third, the state spread is wide: CarInsurance.com's state table shows the added increase ranging from $56 a year in Hawaii, where state rules prevent age-based pricing, to $3,373 a year in Louisiana, so a national average is a starting point for a quote, never a substitute for one.

Calculation transparency

Scope. The added insurance line only, the increase in the parents premium after a teen is listed, on published 2026 averages, by age, by gender, by coverage level, and in one worked family example.

Rules and time period. CarInsurance.com averages, full coverage, by the teen age, updated August 2026, Quadrant Information Services rates; Insurify quote averages, October 23, 2026, from 500+ partners; worked example starts from an illustrative $2,400 a year parents premium, not a published average. Discount percentages apply to the premium under each insurer own rules, not automatically to the whole added amount.

Scope and limitations. Educational estimate only. There is no single published national before-and-after figure for adding a teen on liability-only coverage alone, so this page does not present one. Discount dollars are illustrations worked from published percentages, not promises. The state spread is wide, from $56 a year in Hawaii to $3,373 a year in Louisiana in CarInsurance.com state table, so a national average is a starting point for a quote, never a substitute for one. Insurance quotes, gas prices, and local rates vary by driver and address. Get a real quote for the same car, coverage, and loan before you decide.

Source links checked November 6, 2026. Figures: CarInsurance.com, How Much Does it Cost to Add a Teenager to Car Insurance, updated August 2026, Quadrant Information Services rates, full coverage, 100/300/100 limits, $500 deductibles; Insurify, Cheapest Car Insurance for Teenagers (2026), updated October 23, 2026, quote data from 500+ partners; CDC teen-driver crash data, fatal crash rate nearly three times drivers 20 and older per mile, ages 16 to 19. The CarInsurance.com age and state tables and the Insurance Information Institute range are named only, not linked.

Primary sources: MoneyGeek cheapest car insurance for teen drivers; Insurify cheapest car insurance for teenagers; CDC teen drivers. How the numbers are calculated is written down on the methodology page, and every source is listed on the sources page.

Definitions

Premium. The price you pay for the policy, usually quoted per month or per year.

Added cost. The increase in the parents premium after the teen is listed, nothing else. On this page, about $3,435 to $3,594 a year on published 2026 averages.

Liability-only coverage. Coverage that pays for injury and damage to other people and their property when the driver is at fault; it does not pay to repair your own car.

Full coverage. Liability plus collision, damage to your own car in a crash, and comprehensive, damage from things other than a crash, like theft, hail, or hitting an animal.

Collision. The part of full coverage that pays for damage to your own car in a crash.

Comprehensive. The part of full coverage that pays for damage from things other than a crash, like theft, hail, or hitting an animal.

Deductible. The amount you pay first on a claim before the insurer pays the rest.

Good-student discount. A discount of 8% to 20% in CarInsurance.com guide, with an average of about 12% reported from CarInsurance.com 2026 report, for good grades.

Telematics. A driving app or device that scores driving. Discounts of 10% to 40% in Insurify under-25 table, and some programs can also raise a rate if the driving scores poorly.

Questions people actually ask

How much does it cost to add a teen to car insurance?

On published 2026 averages, adding a teen to a family policy adds about $3,435 to $3,594 a year, or about $286 to $300 a month. Your own quote can land well above or below that range, because state, insurer, car, and the teen's age all move the number.

How much does adding a teen cost at 16, 17, 18, and 19?

The added cost falls as the teen gets older: about $4,050 a year at 16, $3,740 at 17, $3,478 at 18, and $3,105 at 19, in CarInsurance.com averages. That is about $338, $312, $290, and $259 a month.

Does a son cost more to add than a daughter?

On average, yes, in the published figures. On a parent's policy, a 16-year-old son averages $350 a month and a 16-year-old daughter $325 a month; at 17, it is $323 a month for a son and $300 a month for a daughter. Some states do not allow pricing by gender, so the gap is not the same everywhere.

Is full coverage or liability-only cheaper for a teen?

Liability-only is cheaper in the published averages. For a teen on a parent's policy, Insurify quote averages are $129 a month liability-only and $226 a month full coverage for a daughter, and $152 a month liability-only and $266 a month full coverage for a son. Liability-only pays for damage to others, while full coverage also helps pay to repair your own car.

What lowers the cost of adding a teen?

Published discounts include a good-student discount of 8% to 20%, a driver-education discount of 5% to 20%, and a student-away discount of 5% to 35% when a teen is away at school without a car. The car matters too: an older, lower-value sedan generally costs less to insure for a teen than a high-powered car. Every discount depends on the insurer's own rules.

Related: See what a teen's first year of driving really costs, all in.

Related: See how much a first car costs a teen.

Related: See how to compare car insurance quotes before you add the teen.

Run your own numbers

For the general insurance picture, adult averages, full coverage versus liability-only for adults, and the cheapest cars to insure overall, see how much car insurance costs. To see how a second car changes a household budget beyond insurance, see is a second car worth it. For family cars that fit a monthly budget, see family cars under $400 a month. The calculator runs the same five-year math for a whole car; this page covers only the insurance line of adding a teen. For what a minor crash adds beyond the deductible, see what a fender-bender really costs beyond the deductible.

Figures: CarInsurance.com, "How Much Does it Cost to Add a Teenager to Car Insurance?" (updated August 2026; Quadrant Information Services rates, full coverage, 100/300/100 limits, $500 deductibles); Insurify, "Cheapest Car Insurance for Teenagers (2026)" (updated October 23, 2026; quote data from 500+ partners; adding a teen about $3,435 a year, about 90% rise, about 24% / $1,079 a year less than a separate teen policy); CDC teen-driver crash data (fatal crash rate nearly three times drivers 20 and older per mile, ages 16–19; 16-year-old per-mile rate about one and a half times 18- to 19-year-olds); Insurance Information Institute range (adding a teen raises a premium 50% to 100%) as reported in 2026 guides. Averages are not quotes. Insurance prices vary by state, insurer, car, coverage, and driving record, families need their own quote.