I stick to what I know, so I venture very little outside the retirement plan space. I do that because I believe it is less likely to cause trouble. The two largest payroll providers don’t follow that philosophy -- they are also two of the biggest 401(k) third party administrators (“TPAs”) in the country. While it may look good on paper to hire a payroll provider as a 401(k) TPA, it’s actually a terrible idea, and this article will tell you why.