The payroll software decision is one of the most consequential tech choices a small business makes, and I've seen enough of these go wrong to know that the common mistake happens at a specific moment: when a company grows past 20 employees.
Here's the pattern I see repeatedly.
The 20-Employee Inflection Point
Below 20 employees, almost any payroll software works. The volume is low, your edge cases are rare, and the differences between platforms are mostly UI preferences. Most companies use Gusto by default at this stage, and it mostly works fine.
At 20+ employees, complexity appears fast: multi-state tax filings, contractor vs. employee classification at scale, more complex benefits management (401k, FSA, HSA), HR policy tracking. The software that was "good enough" at 10 employees often starts showing seams at 25.
This is when I see companies either overstay on a tool that's holding them back, or rush into an enterprise platform they don't need yet.
What the Research Shows About Payroll Software Choices
The payroll software comparison guide I maintain tracks how different tools perform at different company sizes. The findings are pretty consistent:
For companies under 20 employees: OnPay and Gusto are the two strongest options. OnPay edges out for simplicity and transparent pricing (flat per-employee fee, no hidden costs). The OnPay review covers the specifics, but the short version is: OnPay doesn't try to be everything, and that's a feature, not a limitation.
For companies 20-100 employees: The decision gets harder. Rippling is worth evaluating if you need deep HR features integrated with payroll. ADP Run is a solid choice if your HR team is more comfortable with traditional payroll-first tooling. Gusto's Premium tier can work, but it's more expensive than most people expect.
For companies 100+: You're often looking at ADP Workforce Now, Paylocity, or Paychex Flex. These are full HCM platforms, not payroll software—the implementation timeline and budget requirements reflect that.
The Mistake Companies Make
Choosing payroll software based on what your accountant uses, rather than what fits your operations. Accountants often recommend platforms they're familiar with for their own workflow efficiency. That's a legitimate consideration, but it should be one input, not the deciding factor.
The other mistake: not auditing your current setup before switching. If you're running payroll in Paychex but considering switching to OnPay, do a proper comparison of what you're actually using vs. what you'd get. Paychex alternatives exist across multiple price points and capability tiers, and the right one for you depends on what you actually need—not just what costs less.
Practical Advice
Before evaluating any payroll software, write down your specific failure modes with your current system. Where does it break? What manual workarounds are you doing? That list becomes your evaluation criteria. A tool that fixes your actual problems beats a tool with a higher feature count every time.
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