How Pay-Per-Mile Car Insurance Works

What pay-per-mile insurance is and how it charges you

Pay-per-mile insurance charges you based on how many miles you drive each month, rather than a flat monthly premium. You pay a base fee plus a per-mile rate — typically between 10 and 25 cents per mile — so a driver who travels 500 miles in a month pays less than one who travels 2,000 miles. The insurer tracks your mileage through a mobile app, a plug-in device you install in your car's diagnostic port, or by reading your odometer at renewal.

This model works best for people who drive infrequently: retirees, people who work from home, those who use public transit most days, or households with a second car used only occasionally. If you drive more than 12,000 to 15,000 miles per year, a traditional policy usually costs less. The math shifts further in traditional insurance's favor if you drive 20,000 miles or more annually.

Pay-per-mile policies cover the same things as standard car insurance — liability, collision, comprehensive — and you still choose your deductible and coverage limits the same way. The difference is only in how you pay for it.

Key Takeaways

• Pay-per-mile insurance charges a base monthly fee plus a per-mile rate, making it cheaper only if you drive fewer than 12,000 to 15,000 miles per year.
• The insurer tracks your miles through a mobile app, a plug-in device, or odometer readings, and you can see your charges in real time on most platforms.
• Not all insurers offer pay-per-mile policies in South Carolina, and availability changes by region and company.
• You still choose your own deductible and coverage limits, and the policy covers liability, collision, and comprehensive damage the same way traditional insurance does.
• If you drive more than expected in a given month, you can switch back to a traditional policy, though some companies charge a small fee for the change.

Which insurers offer pay-per-mile policies in South Carolina

The largest pay-per-mile insurer in the United States is Metromile, which operates in South Carolina and uses a plug-in device or mobile app to track mileage. Milewise, owned by Allstate, also offers pay-per-mile coverage in South Carolina and tracks miles through a mobile app. Insure (formerly Arity) is another option in some areas. Availability varies by ZIP code and changes over time, so you will need to enter your address on each company's website to see whether they serve your location.

Traditional insurers like State Farm, GEICO, and Nationwide do not offer pay-per-mile policies, though some have introduced low-mileage discounts on standard plans. If you drive very little, asking your current insurer about a low-mileage discount may be simpler than switching to a specialized company.

How mileage tracking works and what data is collected

Most pay-per-mile insurers use one of three methods to count your miles. Plug-in devices connect to your car's onboard diagnostic port (usually located under the steering wheel) and send mileage data to the insurer via cellular connection. Mobile apps use your phone's GPS to track when you drive and how far, and you start and stop the tracking manually or the app does it automatically. Odometer readings require you to report your mileage at signup and renewal, with the insurer calculating your monthly usage based on the difference.

Plug-in devices and apps collect more data than just miles driven — they also record when you drive, how fast you drive, and how hard you brake. Some insurers use this information to adjust your rate or offer discounts for safe driving. You can usually see what data is being collected by logging into your account on the insurer's website or app.

Privacy is a real concern with any tracking method. Read the insurer's privacy policy before signing up to understand what data they collect, how long they keep it, and whether they share it with third parties. You have the right to ask the company what information they hold about you.

Calculating whether pay-per-mile saves you money

To know whether pay-per-mile insurance will cost less than a traditional policy, you need three numbers: your expected annual mileage, the base monthly fee the pay-per-mile insurer charges, and the per-mile rate. Then multiply your annual miles by the per-mile rate, divide by 12 to get a monthly cost, and add the base fee.

Example: Metromile's base fee in some areas is around $25 per month, and the per-mile rate is roughly 20 cents. If you drive 6,000 miles per year, that is 500 miles per month. Your monthly cost would be $25 (base) plus (500 miles × $0.20) = $125 per month, or $1,500 per year. A traditional policy for a low-risk driver in South Carolina might cost $800 to $1,200 per year, so pay-per-mile would be more expensive in this case.

If you drive only 3,000 miles per year (250 per month), the same pay-per-mile policy would cost $25 + (250 × $0.20) = $75 per month, or $900 per year — potentially cheaper than traditional insurance. The break-even point depends on your insurer's specific rates and your driving profile, so get a quote from both a pay-per-mile company and a traditional insurer before deciding.

Switching from traditional insurance to pay-per-mile

You can switch to a pay-per-mile policy at any time, though the process varies slightly by insurer. Most companies let you start a new policy online in about 15 to 20 minutes. You will need your driver's license, vehicle identification number (VIN), current insurance information, and a valid payment method. If you are switching mid-policy from a traditional insurer, you may be able to cancel without penalty, but check your current policy's cancellation terms first — some have early termination fees.

Once you are approved, you will receive a plug-in device in the mail (if the insurer uses one) or instructions to download the mobile app. Installation of a plug-in device takes a few minutes. Your new policy typically starts within a few days, and your old policy ends on the date you specify. Keep proof of your new insurance card in your car before the old policy expires.

If you realize mid-month that you are driving more than expected and pay-per-mile will not save you money, some insurers let you switch back to a traditional policy or to a different plan. Ask about this before signing up so you know what your options are if your driving habits change.

What happens if you drive more miles than you expected

Pay-per-mile insurance charges you for every mile you drive, so if you take a long road trip or your commute changes, your bill will be higher that month. You can see your mileage and charges in real time through the insurer's app or website, so you will not get a surprise bill at the end of the month. If you notice you are driving significantly more than you thought, you have a few options.

Some insurers let you switch to a traditional policy mid-term with little or no penalty. Others offer the option to "pause" your pay-per-mile coverage for a month if you know you will be driving more. A few will let you adjust your plan to a higher mileage tier or switch to unlimited mileage for a set monthly fee. Contact your insurer directly to ask what flexibility they offer — the answer depends on the company and your specific policy.

If you find yourself consistently driving more than 15,000 miles per year, pay-per-mile insurance is probably not the right fit, and a traditional policy will cost less over time.

Comparing pay-per-mile to low-mileage discounts on traditional policies

Before switching to a pay-per-mile insurer, compare the cost to a traditional policy with a low-mileage discount. Many major insurers — including State Farm, GEICO, Allstate, and Progressive — offer discounts of 10 to 30 percent if you drive fewer than a certain number of miles per year, usually 7,500 to 15,000. The discount is applied to your standard premium, so you pay a flat monthly rate rather than a per-mile charge.

The advantage of a low-mileage discount is simplicity: you do not need to install a device or use an app, and your rate does not fluctuate month to month. The disadvantage is that the discount is fixed, so if you drive very little one month and more the next, you pay the same rate either way. With pay-per-mile, you only pay for the miles you actually drive.

Get quotes from both a pay-per-mile insurer and a traditional insurer offering a low-mileage discount, using your actual expected annual mileage. The cheaper option depends on your specific situation, your insurer's rates, and how consistently you drive.

Frequently Asked Questions

Do I have to use a plug-in device, or can I use the app instead?

It depends on the insurer. Metromile offers both a plug-in device and a mobile app, and you can choose which one to use. Milewise uses a mobile app. Check the insurer's website to see what tracking methods they support in your area before signing up.

Will pay-per-mile insurance affect my credit score?

No. Pay-per-mile insurers perform a soft credit check when you apply, which does not affect your credit score. Hard inquiries that lower your score only happen when you apply for credit like a loan or credit card.

What if I do not drive my car for a month?

You still pay the base monthly fee, but you will have zero per-mile charges. This is one reason pay-per-mile works well for people with a second car they use rarely — the base fee is usually lower than a traditional policy's monthly premium.

Can I get pay-per-mile insurance if I have had an accident or ticket?

Yes. Pay-per-mile insurers use the same underwriting process as traditional insurers, so your driving record affects your rate the same way. An accident or ticket will increase your premium, but it will not disqualify you from pay-per-mile coverage.

What happens to my data if I cancel the policy?

The insurer stops collecting new data once your policy ends. Existing data is typically kept for a set period (usually three to seven years) for record-keeping and dispute resolution. Read your insurer's privacy policy to understand their specific data retention practices.