Nearly two times as many startup business owners cite the U.S. tax structure over health care reform as the issue they anticipate having the biggest impact on their business this year, according to a new survey by the payroll technology provider Paychex.

Of the more than 250 business owners surveyed, 47 percent ranked the U.S. tax structure as the top issue affecting their small business, nearly double the number that selected health care reform (25 percent).

Overall government regulation (20 percent), potential government inaction (6 percent), and immigration reform (2 percent) ranked below those among the top issues.

To view an infographic on the survey findings, click here.

Separately, Paychex released Paychex Accounting Online, a mobile app for the iPhone, iPad and iPod Touch that allows small business users to access their Paychex Accounting Online account from a device running Apple’s iOS operating system.

For more information, visit www.paychex.com.