October 13, 2014 Blake Oliver Accounting Xero + QBO share just 2% market penetration in U.S. accounting software [chart] October 13, 2014 Blake Oliver Accounting Xero and QBO together have a market penetration of close to 2%. That's in a total market of 29 million small businesses in the United States. The market penetration is less than 12% if you only count businesses already using desktop software.