They are not released into circulation by the federal government, they are only sold at premiums above face by the united states mint. Anyone who spends them after buying them from the mint is taking a loss in doing so. Due to the premiums they hold they are not intended by the federal government to circulate as money, though since they are legal tender and the premiums are often quite small they do occasionally circulate as money rather. Most NIFC issues are extremely rare in circulation (nifc dollars, 1996w dimes, proofs, silver issues), the only reason that NIFC halves are seen frequently is that the fedderal government has not released a new issue of halves for general circulation since 2001. Therefore the base number of circulating half dollars is signifigantly lower than other denominations, leading to a higher percentage of nifc in circulation than other denominations such as nickels or pennies.




















