How to estimate car insurance before you buy a used car

The short answer

Get a real quote on the exact car before you agree to buy it. Use your state's average to set a starting budget while you browse, then quote each finalist by its VIN with two or three insurers, using the same coverage and deductibles. Put the quote into your monthly budget before you work out how much car you can afford, because every dollar of insurance is a dollar that can't go to the loan payment.

What sets your premium

Every insurer weighs things differently, but the Texas Department of Insurance lists the factors most companies use: your claims history, where you live and how much you drive, age, gender and marital status, occupation, the cost to replace the car you drive and your credit score. Your driving record matters too: tickets and at-fault accidents usually raise the price.

The car itself changes the quote. Maryland's insurance regulator notes that high-performance vehicles usually cost more to insure, and Experian's data shows new cars cost more to insure than used ones. The deductible you choose matters as well: a higher deductible lowers the premium, but you pay more out of pocket after a claim.

Start with your state's average

Before you have a quote, a state average is a reasonable placeholder. Here's Experian's average for full coverage (liability plus comprehensive and collision, which lenders require on a financed car) in the states around ten big metros, per month:

Atlanta (Georgia): $320. New York: $288. Los Angeles (California): $249. Houston and Dallas (Texas): $241. Miami (Florida): $228. Denver (Colorado): $226. Chicago (Illinois): $212. Phoenix (Arizona): $210. Salt Lake City (Utah): $205. Charlotte (North Carolina): $182. The national average is $243.

These are statewide averages across all ages and driving records. Rates in a big city are often different from the state's average, and your own quote can be far higher or lower. Use the average to plan, never to sign.

What insurance does to the car you can afford

Say your total budget for the car is $500 a month, loan plus insurance. Whatever insurance takes, the loan can't use. At 8.81% APR for 72 months, here's how much you could borrow after each state's average premium:

Georgia ($320 insurance): $180 left for the loan, about $10,040 financed. New York ($288): $212 left, about $11,820. Texas ($241): $259 left, about $14,440. Arizona ($210): $290 left, about $16,170. North Carolina ($182): $318 left, about $17,730.

That's a gap of more than $7,600 in how much you can borrow on the same $500 budget, from insurance alone. As a rule of thumb, at these loan terms every $100 a month of insurance is about $5,580 less you can finance. Taxes and fees then come out of the amount financed, so the car's price has to be lower still.

Get a quote on the exact car (its VIN)

You don't need to own a car to get a quote; you can quote the one you plan to buy. GEICO notes you'll need the vehicle's VIN for the quote, and the VIN identifies the exact year, model and trim. LotGauge shows the VIN for every car in its results, so you can copy it straight into an insurer's quote form.

To compare insurers fairly, give each one the same information and ask for the same liability limits, the same comprehensive and collision deductibles and the same extras. Otherwise the cheapest quote may just be less coverage.

Comparing models before you have VINs? The Highway Loss Data Institute (part of IIHS) publishes insurance losses by make and model: how often each vehicle has claims and how much they cost, compared with the average vehicle in its class. Compare models in the same class, and look closely at collision and comprehensive (which covers theft, among other things).

If you're financing, the lender sets the minimum

States require liability coverage (some also require extras like personal injury protection), but no state requires comprehensive or collision. A lender will almost always require comprehensive and collision so the car can be repaired or replaced if it's damaged or totaled. Some lenders also require uninsured motorist coverage, so check the loan's insurance requirements before you choose the cheapest option.

If you put little or nothing down, you may owe more than the car is worth for the first year or two. GAP coverage pays that difference if the car is totaled. Insurers often sell it for less than a dealer does; see what dealer add-ons, including GAP, do to your payment and how much to put down.

Does your credit affect your insurance?

In most states, yes: insurers can use a credit-based insurance score, and weaker credit can mean a higher premium. Some states limit that. California, Hawaii, Massachusetts and Michigan don't allow credit to set auto insurance rates. Maryland, Oregon and Utah allow it only in limited ways, such as on a new policy or for discounts.

If your credit is fair or poor, that can raise both your loan rate and your insurance, so leave more room in the budget. See how APR and credit score change your payment.

Put the estimate into the calculator

In the LotGauge car payment calculator, enter your monthly quote (or your state's average) in the Insurance field. The calculator shows the true monthly cost (loan payment plus insurance), checks it against your monthly target and, under "How much car can you afford?", works out the highest price that still fits after tax and fees. The term comparison shows the payment with insurance at every loan length.

Example: a $500 monthly target in Houston with Texas-average insurance ($241), $2,500 down, 72 months at 8.81%, 6.25% Texas tax, a $35.50 title fee and a $225 doc fee supports a car up to about $15,700. Open this example and change the insurance to your quote to see the difference.

If you search with LotGauge, save your insurance estimate in your search. Every car is then ranked by its true monthly cost, insurance included.

Sources

Texas Department of Insurance, How are your auto and homeowners insurance costs calculated? Maryland Insurance Administration, Tips on Shopping for Automotive Insurance. Experian, Average Cost of Car Insurance (October 2026; marketplace policy data as of September 2026), Which states restrict credit-based insurance scores (2025) and average used-car loan rates (Q2 2026). GEICO, How to shop for car insurance. Progressive, Financed car insurance requirements. IIHS-HLDI, Insurance losses by make and model. Checked October 2026. Loan amounts were calculated with LotGauge's calculator and are examples, not offers or insurance quotes.