Effects of Changing Coverages on Premiums
Last week I played around with my personal details on Kanetix and we learned how the various characteristics affected the premiums you could expect to pay on auto insurance. Today, I played with the numbers some more, this time changing the various coverages and they behaved just as you’d expect.
One thing that was interesting was that when I played this game at the end of August, the companies listed weren’t the same ones that were listed today. The four companies I saw most often were Unitrin Direct, Travelers, MetLife Auto, and Electric Insurance Company (Drive Insurance from Progressive made an appearance too).
- When I took away the towing and/or rental coverage, the quotes from some companies didn’t change. That’s not to say that the coverage is free but when they’re trying to capture business, the $3 (towing) or $5 (rental) is small potatoes.
- The values in the row for bodily injury/property damage coverage for $25k/$50k/$25k is not a typo, it really only differed by a quarter! Also, $20k/$40k/$15k was also not that big. I suspect it’s because many states have minimums on how much insurance you must carry and these values are far lower than the ones at least in Maryland.
- What’s interesting is the curve that the prices take when plotted against the coverages. For example, the increase going from a $1000 deductible to a $500 deductible was only $66.88 per six months. If you go from $1000 to $250 you’re talking a price difference of $125.00. I expected the the curve would be steeper.
As a reminder, here were the baseline characteristics I input:
Benchmark - One car with one driver garaged in the zip code where I live in what can be classified as suburbia. I’m male, 26, single, own a home, Master degree, engineer, with current employer for 3 years, licensed since 16, never suspended or revoked, not been ordered to carry an SR-22, 0 violations, residential insurance policy, no defensive driving-type course. I own my 2003 Toyota Celica, I drive it to and from work (~10 miles, 5 days), putting on approximately 12k miles/yr.
The coverages I selected are $100k/$300k/$100k for Bodily Injury and Property Damage and the same for Uninsured/Underinsured Motorists and UM/UIM Property Damage. Personal Injury Protection-Medical (and Funeral) Expenses set at $2500 Basic (everyone covered). $1000 deductible on both Comprehensive and Collision, yes to Towing and Rental coverages.
Benchmark Rates: 4 results, Average rate of $617.25. The quote at the end of August was for $628.70, but I’m pretty sure the difference was because of the different companies and because I probably entered in some of my information different (not every question is covered in the benchmark information I listed above). Regardless, it shouldn’t affect the analysis, you just can’t compare the numbers today with the ones in August (not that you would anyway).
Rental and Towing Service Coverages:
| Changed | Average Quote |
$ Diff | % Diff |
|---|---|---|---|
| No Rental | $607.25 | -$10.00 | -1.62% |
| No Towing | $613.75 | -$3.50 | -0.56% |
Collision and Comprehensive (C/C) Coverage: (baseline $1000k deductible)
Collision and Comprehensive Coverage are usually connected, the deductible you select on one is the what you will use for the other.
| Changed | Average Quote |
$ Diff | % Diff |
|---|---|---|---|
| $500 Deductible C/C | $684.13 | +$66.88 | +10.83% |
| $250 Deductible C/C | $742.25 | +$125.00 | +20.25% |
| $100 Deductible C/C | $794.25 | +$177.00 | +28.67% |
| No C/C Coverage ** | $364.50 | -$252.75 | -40.94% |
** If you don’t elect collision or comprehensive insurance, you can’t have rental or towing coverage. The value in the table wasn’t changed to reflect the $8 difference, but if it were included then the price for coverage would be $372.50, a drop of 39.65%.
Bodily Injury, Property Damage Coverage (plus Uninsured/Underinsured) (baseline $100k/$300k/$100k)
Your uninsured/underinsured motorist coverage can’t exceed your regular bodily injury and property damage coverage so the two match in both instances below. So, if it says $250k/$500k/$100k then you get $250,000 personal injury, $500,000 accident coverage, and $100,000 property damage coverage. Normally, you can elect to have lower uninsured/underinsured but we didn’t in our analysis.
| Changed | Average Quote |
$ Diff | % Diff |
|---|---|---|---|
| $250k/$500k/$100k | $646.38 | +$29.13 | +4.71% |
| $100k/$300k/$50k | $613.13 | -$4.12 | -0.67% |
| $50k/$100k/$50k | $594.88 | -$22.37 | -3.62% |
| $25k/$50k/$25k | $617.50 | +$0.25 | negligible |
| $20k/$40k/$15k | $607.23 | -$10.02 | -1.65% |
Personal Injury Protection-Medical (and Funeral) Expenses – includes reimbursement for Lost Wages
This is called PIP, or no-fault coverage, and legally required in Maryland. The baseline had it set at $2500 Basic which covers everyone, the one listed in the table below is the Limited version which covers only persons under 16.
| Changed | Average Quote |
$ Diff | % Diff |
|---|---|---|---|
| Limited | $599.50 | -$17.75 | -2.87% |



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