Marriage/domestic partnership discounts
One plus one can equal cheaper car insurance. Premiums can drop when you get married, because insurance companies believe that drivers who are coupled up tend to be safer than those who are footloose and fancy-free.
Some insurers, such as Safeco and Travelers, extend car insurance couples discounts to unmarried same-sex partners, says Knight. "It can afford them so much savings," she adds.
Other unmarried couples might insure their vehicles together to receive a multicar discount, which almost all providers offer. Or, if the two of you own property together and have homeowners insurance, there's usually a bundling discount to insure your car with the same company.
Whether you're married or single, do some research before you renew an auto policy to make sure you're getting all the discounts you can, says Michael Barry, a spokesman for the Insurance Information Institute.
"Look and see where you are getting discounts with your current policy," he says. "Are there discounts that other agencies are offering that you're not seeing? Ask them about it."
And while car insurance discounts are great, don't get carried away, because a company that offers few discounts may still have a lower overall price.