With 10,000 small businesses using them to process billions of dollars in payroll annually ZenPayroll just landed $60M from Google Capital valuing the business at $560M
Launched two years ago, ZenPayroll aims to reduce the pain and possibility of error for business owners who hand-process payroll. The San Francisco-based company offers a cloud-based system to automate tax calculations and payroll payments. ZenPayroll's web-based services are already used by 10,000 small businesses.
http://uk.businessinsider.com/zenpayroll-raises-60-million-2015-4?r=US