This safe debt, called a general-obligation bond, is said to be the next strongest thing to Treasuries because it is backed by a “full faith and credit” pledge. That means the government that issued it will pay it on time, no matter what.

But now Jefferson County, Ala., has stopped paying such debt, breaking with convention and setting up a fundamental test of what full faith and credit truly means.

“We all want to know, ‘What’s the truth here?’ ” said Richard A. Ciccarone, chief research officer at McDonnell Investment Management. “The way I learned it, full faith and credit was considered all the taxing power of a community, and that means there’s an infinite pledge. When you get into bankruptcy court, truth is something that can be revealed in a new way.”

Jefferson County filed the biggest Chapter 9 bankruptcy in United States history last month, raising new uncertainty about the safest municipal bonds. Court precedent offers few answers. Municipal bankruptcies are rare, and most have involved tiny, special-purpose districts that did not even have general-obligation bonds, having issued revenue bonds, which are considered riskier because they guarantee repayment solely from money generated by a specific project like a toll road.

The few places that have gone bankrupt with general obligations outstanding have sent reassuring signals, making payments even though they were not required to in bankruptcy. Orange County, Calif., the previous Chapter 9 record-holder, took a few extra months to pay some maturing debt, but it compensated investors for the delay by giving them almost a full percentage point more interest than it otherwise owed them.

The small city of Central Falls, R.I., has been duly paying its general-obligation debtholders in Chapter 9 this year, bolstered by a new state law giving those investors priority over everybody else.

Jefferson County, by contrast, is taking advantage of the automatic stay granted in bankruptcy, which bars creditors from demanding payments or grabbing collateral. Officials say they stopped sending cash to the county’s paying agent in November and will not send any money this month, either.

Bankruptcy experts have long known that in theory a municipality could use the stay to revoke its full faith and credit pledge, but they have not watched a big distressed city or county go through with it. “You’ve got a case here where the rubber has hit the road,” said Kenneth N. Klee, a bankruptcy lawyer representing Jefferson County, whose debt grew out of poorly conceived efforts to finance a court-ordered rebuilding of its sewer system.

The county’s nonpayment is not its only surprise. Like many places, it used newfangled instruments to circumvent constitutional limits on how much debt it could legally issue. In Alabama, counties are required to hold a referendum before issuing any general-obligation bonds. So Jefferson County has not issued such bonds since the 1950s. Instead, it issues warrants, which look nearly identical but do not require the referendum.

Official disclosures promote the county’s warrants as “general obligations,” toward which “its full faith and credit have been irrevocably pledged.” Sounds good, but what does it really mean? Conventional wisdom has it that if a government defaults on a general obligation, its creditors can take it to court, where the judge will order it to raise taxes — as much as it takes, no matter how painful.

But that now appears to be a hollow threat in Jefferson County. Counties in Alabama do not have the legal authority to raise taxes. Only the state can do that.

“There’s a lot of uncertainty, generally, about what full faith and credit means,” said David A. Skeel Jr., a law professor at the University of Pennsylvania. “There’s a whole debate about whether these obligations are ever enforceable. And this is even apart from the weird situation you’re referring to, where the county is pledging its full faith and credit but doesn’t really have the ability to do that.”

Kyle Whitmire contributed reporting.

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