Back in October the Bureau Of Engraving And Printing announced the issue date of the redesigned $100 bills would be delayed citing a manufacturing problem:

The Bureau of Engraving and Printing manufactures Federal Reserve notes and has identified a problem with sporadic creasing of the paper during printing of the new $100 note, which was not apparent during extensive pre-production testing. As a consequence, the Federal Reserve will not have sufficient inventories to begin distributing the new $100 notes as planned.

CNBC talked to unnamed persons familiar with situation for more details:

  • 1.1 billion of the new bills have been printed

  • officials don’t know exactly how many of the 1.1 billion bills include the flaw

  • speculation is as many as 30% of the bills included the flaw

  • per-note cost of about 12 cents

  • $120 million in spoilage

The Bureau is looking into automated inspection to find the defective bills:

Because officials don’t know how many of the 1.1 billion bills include the flaw, they have to hold them in the massive vaults until they are able to develop a mechanized system that can sort out the usable bills from the defects.