BUYING INSURANCE CAN BE confusing, but when the unexpected happens – a house fire, a fender bender or a broken bone – it’s a relief to know that some of those financial losses will be covered. But how do you know how much coverage you need? And what questions should you ask before buying a policy? Many consumers aren’t sure. Insurance coverage is far from one size fits all, so here’s a look at mistakes some consumers make when buying insurance.

1. Assuming insurance is out of reach. The U.S. Census Bureau reports that 48 million Americans had no health insurance in 2012. And about 30 percent of U.S. households have no life insurance, according to LIMRA, a worldwide research and consulting organization for insurance and financial services. In some cases, consumers skip insurance because they think it’s out of their budget. Often, that’s not the case, according to Marvin Feldman, president and CEO of the LIFE Foundation, a nonprofit organization that educates consumers about financial planning and insurance. The LIFE Foundation collaborated with LIMRA on the 2013 Insurance Barometer Study, which found that the average consumer thinks life insurance is three times more expensive than it actually is. “[Consumers are] not researching it to determine what the cost is,” Feldman says.

When buying health insurance or property and casualty insurance, ask about potential discounts. “Two-thirds of consumers don’t realize they can get financial help if they buy their own health insurance, and they can get financial help if they go and buy in these health insurance marketplaces,” says Lynn Quincy, senior policy analyst with Consumers Union, a division of Consumer Reports. “You may be way overpaying if you don’t investigate this possibility.” While health insurance discounts are often income-based, homeowners and auto insurers offer discounts for everything from being a member of groups like AARP, to being a good student or a good driver, to having a home security system.

[Read: Is Your College Student Properly Insured?]

2. Relying on assumptions or outdated figures. Changing economic conditions mean you might need more insurance coverage than you had in the past. Take life insurance. In the past, consumers might have based their life insurance coverage on their current income, but “if something happens and you’re no longer around, you need more capital at work to provide the same income [to your beneficiaries],” Feldman says. Disability and long-term care insurance are even more complicated than traditional life insurance. “For disability, do you want coverage that lasts forever? Are there health issues in your family?” Feldman asks. “That’s where you need to speak to somebody to get some guidance.”

In the case of homeowners insurance, your home could be underinsured if you’ve renovated or if the cost to build a home has increased due to higher material costs or other factors. That’s why experts recommend reviewing insurance coverage once a year to make sure it still fits your needs. Talk to your insurance agent if you’re unsure.

3. Shopping on price alone. Comparing insurance policies can be confusing, but resist the urge to simply choose the policy with the lowest premium. Consider the company’s reputation and the coverage you’d get for that premium. “As a general rule with health insurance, the higher the premium, the lower the amount you pay when you go to the doctor,” Quincy says. Private health insurance plans must provide coverage examples showing what your estimated out-of-pocket costs would be for, say, having a baby or managing Type 2 diabetes. Some examples might not apply to you, but they can help you compare plans and see how much you might pay in coinsurance and copays.

“Make sure you’re shopping apples to apples and getting quotes based on the same coverage that you have,” says Lori Conarton, a spokeswoman for the Insurance Institute of Michigan. Your property and casualty insurance may not cover things like food spoilage in the event of a power outage or stolen electronics worth more than $1,000, so you may want to purchase extra endorsements to cover those possibilities, she adds.

[See: 10 Costs Homeowners Insurance Doesn’t Always Cover.]

With disability or long-term care insurance, prices can vary depending on the length of the elimination period – the amount of time you must wait before coverage kicks in – and whether the policy includes inflation protection, so consider these factors, too.

4. Glossing over the details. Make sure you understand what your insurance policy covers. For health insurance, it’s cheaper to see doctors who are in-network and buy prescription drugs covered by the formulary, so Quincy suggests checking to see if your doctor is in-network and if your prescription drugs are covered before you buy a policy. Otherwise, you could get an expensive surprise.

Read your insurance policy and contact your insurance agent if anything is unclear. “Unfortunately, a lot of people don’t find out what coverage they should have had until they have a loss,” Conarton says. “Here in Michigan, we’ve had a lot of winter weather, and some people don’t know that flooding is not covered under a regular homeowners insurance policy.” However, you can usually buy a separate flood insurance policy. Many people also assume that drain and sewer backups are covered by insurance, but often they’re not, Conarton adds.

[Read: How to Get Your Insurance Claim Paid.]

5. Setting your deductible too low. Setting a low deductible typically means higher premiums, and in the case of property and casualty insurance, a greater likelihood of small claims that could ultimately raise your premiums. Insurance is designed to protect against losses you could not cover yourself, so if you can afford to pay the first $500 or $1,000 in losses yourself, you may not need a lower premium. “Consider your own financial situation,” Conarton says. “How much of the risk are you willing to assume before you make a claim and the insurance company pays on your claim? You really have to think about how much of that loss you could pay yourself.”