Yes Virginia, some debt can be good, and here's how to tell

Yes Virginia, some debt can be good, and here's how to tell · CNBC

Whether they're keeping up with the Joneses or keeping up with the Kardashians , Americans have become big spenders. And many are in over their heads in debt.

Of course, not all debt is necessarily bad. Some degree of debt can open doors and economic opportunities: paying for a college education, buying a car to get to work, obtaining a home in a nice community. The questions then become, how much debt is too much and what is the right amount of red?

Over the past 30 years, American families have taken on increasing amounts of debt, even as incomes failed to keep pace. About 80 percent of American households now hold some form of debt, according to the Pew Charitable Trusts' survey of American family finances.

Nearly 7 in 10 said that debt is a necessity, even though they would rather not have it. Almost exactly the same percentage also said that loans and credit cards have expanded their opportunities, according to the Pew report.

Here's a look at four common types of debt Americans take on and how best to manage it.

Auto debt

Given America's obsession with motor vehicles, one of the first things many people do is rack up debt when buying a car. More than 33 percent of American households are making car payments, according to Pew, with nearly $1 trillion in auto loans now outstanding .

In some cases, borrowing money to buy a car makes sense. Having a vehicle, for example, may let you commute to a job where alternative transportation may be lacking. Loan rates currently average 4.8 percent nationally, but could be as low as zero percent for those with excellent credit.

For an average auto loan, which is just over $28,000, payments are about $400 a month, according to Experian, a credit monitoring firm.

To reduce that cost, buy a 2-year-old car, advises Scott Tucker, president and founder of Tucker Solutions in Chicago. "The price drops like a rock initially," he said, "so if you have to finance it, keep the purchase price down."

"Look at it like a device, not a status symbol," he said.

Mortgages

Most Americans' largest liability is their home mortgage. Currently, a median priced house costs $222,700. With 20 percent down, a buyer would need to earn at least $51,114 just to afford the monthly payments , according to an analysis by mortgage research firm HSH.com. In many parts of the country, costs are much higher.

To ease that burden, Tucker said homebuyers should scale down their expectations. "Don't go crazy and buy a home you barely qualify for," he said. For a starter home, a "three-bedroom, two-bath is a good target."