Starting a Payroll Processing Business?

I've been doing payroll for a family business for about two years. I've decided that I should start a small payroll processing company on the side. I already have a few small companies that I'm positive will give me their business. What payroll software do you know of that will allow me to keep up with... show more I've been doing payroll for a family business for about two years. I've decided that I should start a small payroll processing company on the side. I already have a few small companies that I'm positive will give me their business. What payroll software do you know of that will allow me to keep up with multiple companies payrolls (i.e Quickbooks)? I plan on reporting taxes, printing payroll checks, w2, filing the different forms, etc. Thanks for your help.
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