Concerns that the Federal Reserve could suffer losses on its massive bond holdings may have driven the central bank to adopt a little-noticed accounting change with huge implications: it makes insolvency much less likely.

The significant shift was tucked quietly into the Fed’s weekly report on its balance sheet and phrased in such technical terms that it was not even reported by financial media when originally announced on Jan. 6.

But the new rules have begun to catch the attention of market analysts. Many are surprised that the Fed can set its own guidelines  and relieved that the remote but dangerous possibility that the world’s most powerful central bank might need to ask the U.S. Treasury or its member banks for money is now more likely to be averted.

“Could the Fed go broke? The answer to this question was ‘Yes,’ but is now ‘No,’ ” said Raymond Stone, managing director at Stone & McCarthy in Princeton, N.J. “An accounting methodology change at the central bank will allow the Fed to incur losses, even substantial losses, without eroding its capital.”

The change essentially allows the Fed to denote losses by the various regional reserve banks that make up the Fed system as a liability to the Treasury rather than a hit to its capital. It would then simply direct future profits from Fed operations toward that liability.

This enhances transparency by providing clearer, more frequent, snapshots of the central bank’s finances, analysts say. The bonus: the number can now turn negative without affecting the central bank’s underlying financial condition.

“Any future losses the Fed may incur will now show up as a negative liability as opposed to a reduction in Fed capital, thereby making a negative capital situation technically impossible,” said Brian Smedley, a rates strategist at Bank of America-Merrill Lynch and a former New York Fed staffer.

“The timing of the change is not coincidental, as politicians and market participants alike have expressed concerns since the announcement (of a second round of asset buys) about the possibility of Fed ‘insolvency’ in a scenario where interest rates rise significantly,” Smedley and his colleague Priya Misra wrote in a research note.