Should you report a fender bender?

You and your SUV are in a minor accident. Luckily, no one is injured, but there’s a little damage to your vehicle — more than just a scratch — and maybe to someone else’s car or property. Should you inform your insurance company about it or keep the matter quiet and pay any repair costs out-of-pocket?

Fear of an insurance rate hike is often the concern behind that question. But there are some important factors to weigh as you determine your best course of action.

Seven in 10 auto accidents in 2011 involved another vehicle, according to Department of Transportation data. If your mishap falls in that category, always report it, especially if you may have been at fault, because your coverage also protects you against liability for harming others.

Your insurance company and some state laws might require you to report in such cases. But officially documenting the facts is also in your own best interests whenever you’re involved with a stranger in a potential damage claim situation — even if you and another reasonable person work out a private arrangement to keep the insurance companies out of it.

Repairs often cost more than people anticipate. For example, when a 2010 Toyota Corolla rearended a 2010 Toyota RAV4 at 10 mph in testing by the Insurance Institute for Highway Safety, the Corolla had more than $3,800 in front-end damage and the SUV incurred more than $6,000 in rear damage, because of the vehicles’ bumper height mismatch.

And the lack of immediate injury can be deceiving. The adrenaline rush accompanying even a low-impact crash can mask injury symptoms, and soft-tissue damage can take 24 to 48 hours to show up. Bogus injury claims are another possibility worth considering.

If you don’t report and big costs surprise you later, your insurance company might not pay because its ability to investigate the claimed damage, when time was of the essence, has been lost.

Your toughest decisionmaking challenge comes when the damage is to your own vehicle and property. Filing a claim would probably produce a tempting payout after the deductible. You must consider an unknown factor of how your claim might impact your premiums.

If the damage is minor and confined to your own vehicle and property, you’re typically not required to report it to your insurer.

Unfortunately, Consumer Reports points out, it’s impossible for consumers to know in advance how much their premiums will increase, and for how long, to weigh that against a claim payout. But among its subscribers, 7 percent of claimants felt that their insurer unfairly raised their premium as a result of their claim.

Most states regulate “chargeable” accidents, which are loss payouts that auto insurers are allowed to count against your driving record in calculating your risk and setting your premiums. The rules vary, but payout thresholds of $500 to $1,000 are typical.

Major insurers also apply their own loyalty programs based on how long you’ve been with the company and your good driving and payment record.

If the damage is minor and confined to your own vehicle and property, maybe from backing into your fence or garage door, you’re typically not required to report it to your insurer if you’re not making a claim.

It also doesn’t make economic sense to do so if the repair cost is smaller than or not sufficiently bigger than your collision coverage deductible.