I’ve used just about every payroll processor out there (I’m a CPA and interim CFO for 150+ startups) and I can confidently say that Gusto (formerly known as ZenPayroll) is the best, for a number of reasons:
Easy Online Interface: I know this is going to sound nuts, but other interfaces make finding basic information really difficult. I’ve spent hours trying to generate simple reports from other payroll processors. (Time I could’ve been spending doing more value-add activities!) I’ve even received patently incorrect reporting from a large Business Bank payroll processor.
Late Payroll Taxes: Many other payroll processors that I’ve worked with have at some time or another forgotten to file a 941 or DE9. This has never happened with Gusto. They file all your taxes automatically and on time.
Competitive Pricing: It’s really cheap. But I’d still use if it was 3x more expensive because the peace of mind that Gusto gives is priceless.
I trust Gusto with my startups’ payroll and with my own company’s payroll.