What is the most affordable payroll software for a 100-person company?

For a **100-person company**, the most affordable option in the results is **Patriot Software** if you are comparing published base-plus-per-employee pricing, because its full-service plan is listed at **$37 + $5 per employee per month**.[2] That works out to about **$537/month** for 100 employees, before any extra fees or add-ons.[2]

A few important caveats:

- **OnPay** is listed at **$40 + $6 per person monthly**, which would be about **$640/month** for 100 employees.[2]

- **Gusto** starts at **$55/month**, but the result does not show the per-employee pricing in the snippet, so it is not enough to confirm the total cost for 100 employees from the provided results alone.[1]

- **ADP** is described as one of the more affordable payroll services, but no concrete 100-employee price is given in the result, so it cannot be compared precisely here.[5]

If your goal is the **lowest stated cost for a 100-person team** from these results, **Patriot Software** appears to be the cheapest.[2] If you want, I can also compare the estimated monthly cost of each provider for exactly 100 employees in a simple table.