PEO Options for a CPA Firm's Busy-Season Staffing

Staff accountants below the exempt threshold who work sixty-hour weeks in March need every overtime hour calculated correctly, and a payroll error during the highest-stress stretch of your year erodes trust fast. Both vendors run standard overtime calculations, but ask each one directly how they handle a sudden spike in hours across dozens of staff simultaneously, since that's a very different load than steady, predictable payroll.

A single miscalculated overtime check in the middle of a ninety-hour work week can undo months of goodwill with a staff accountant you're trying to retain past their second or third busy season, so treat this as a question worth pressing each vendor on directly rather than assuming a standard payroll engine handles it well by default.

The median annual wage for accountants and auditors nationally runs around $83,680, with wide variation by experience and market¹. Firms that don't track where their own comp sits against that kind of benchmark risk losing mid-level staff to a competing firm or to industry right after they've invested two or three busy seasons training them. TriNet's dedicated HR contact is generally more useful for this kind of ongoing benchmarking conversation than Justworks' more self-service model.

Accounting and CPA practices carry payroll costs that make up a large share of revenue, consistent with professional services generally², which means a PEO's own fee structure deserves the same scrutiny you'd apply to any other line item eating into partner distributions. Justworks' flat per-employee fee is simpler to model against a firm with a large, stable staff-accountant base. TriNet's percentage-of-payroll or custom pricing can work well too, particularly if your partner-to-staff compensation spread is wide.

Nothing about a PEO relationship affects your firm's state CPA licensing, your peer review status, or your professional liability insurance, those all stay entirely separate from co-employment. What a PEO can affect is turnover, and turnover during a busy season restaffing scramble is genuinely expensive, both in direct recruiting cost and in the client-facing disruption of a mid-tax-season handoff.

A staff accountant who leaves in February, right before the heaviest filing weeks, costs a firm far more than the same departure in a quieter month, since there's rarely time to backfill and train someone before the deadline crush hits. That timing risk is worth factoring into how much you invest in retention year-round, not just in the weeks before busy season starts.

• How does each vendor handle a payroll run where dozens of staff suddenly log significant overtime in the same week?
• Does either vendor provide compensation benchmarking data specific to accounting roles, or only general market data?
• What's each vendor's actual support response time during your firm's busiest weeks, not their advertised SLA?
• How does seasonal part-time or temporary tax-season staff get handled differently from your permanent team?

A smaller firm running under fifteen staff, with a predictable annual busy season and low turnover, may do fine on a self-serve PEO such as Justworks, since the operational complexity is manageable without a dedicated HR contact, but compare current pricing and support with both vendors. A larger, multi-office practice managing compensation bands across several markets, recruiting laterally from bigger firms, and navigating more frequent performance conversations tends to get more value out of TriNet's assigned HR support, even at a higher cost.

Neither choice is permanent, and it's worth revisiting as the practice adds partners or offices. A firm that picked the simpler, cheaper option at ten staff shouldn't assume it's still the right fit once it's running three offices and a much wider spread of compensation bands to manage.