Think of it like the part of a repair bill you agree to cover before anyone else chips in. A deductible is the amount an insurance policy makes the policyholder pay out of pocket before the insurer starts paying on a covered loss. It is common in auto insurance, homeowners insurance, and health insurance, but it does not apply the same way to every kind of coverage. In many auto policies, for example, a deductible usually applies to collision coverage or comprehensive coverage, not to liability coverage for damage you cause to someone else.

In practical terms, the deductible affects how much money actually changes hands after a crash, storm, theft, or medical treatment. If car repairs cost $3,000 and the collision deductible is $500, the insurer typically pays $2,500 and the policyholder pays $500. A higher deductible often lowers the monthly premium, but it also means more financial risk when something happens.

For an injury claim, the key question is whose insurance is paying. If an injured person is making a bodily injury claim against an at-fault driver, that claim usually is not reduced by the injured person's auto deductible. But deductibles can matter for vehicle damage claims and for medical bills submitted through health insurance. Under the Affordable Care Act (2010), most health plans must also cap a patient's yearly out-of-pocket maximum, which limits total cost-sharing beyond the deductible.