Outsource Payroll Processing: What Actually Happens During Each Pay Run

Not why to outsource payroll — the actual mechanics of what happens between "hours worked" and "money in an employee's account," and where the real risk sits.

Payroll looks simple from the outside — hours in, paycheck out — but the actual process between those two points involves enough calculation and compliance detail that errors compound quickly if any single step is rushed or unreviewed. Here's what a properly run outsourced payroll process actually does, step by step.

The pay run, step by step

1. Time and hours collected. Hourly and salaried time data pulled from your timekeeping system, with any manual adjustments (PTO, corrections) applied.
2. Gross pay calculated. Regular hours, overtime (calculated per relevant jurisdiction's rules, not a flat multiplier), bonuses, and commissions computed per employee.
3. Deductions and withholding applied. Federal, state/provincial, and local tax withholding, benefits deductions, garnishments, and retirement contributions calculated correctly per employee.
4. Review before processing. A second person checks totals against the prior run, flagging anomalies — a sudden large bonus, an unusual hours spike — before anything is actually paid.
5. Direct deposit initiated. Net pay disbursed to employee accounts, timed to land on the actual pay date.
6. Tax filings submitted. Withheld taxes reported and remitted to the relevant authorities on their required schedule — this doesn't wait until year-end.

Where payroll errors actually happen

• Overtime miscalculated — especially for employees working across multiple roles or locations with different overtime rules
• Incorrect tax jurisdiction for remote or multi-state employees, especially after someone relocates mid-year
• Benefit deduction changes missed after open enrollment or a life event
• Anomalies processed without review — a data entry error inflating hours or pay goes through unquestioned

Timing: why payroll data needs to arrive before you think it does

Direct deposit itself takes 1-2 business days to actually move through the banking system once initiated, and review needs to happen before that — which means payroll data typically needs to be finalized 2-3 business days before the actual pay date, not on the pay date itself. Businesses new to outsourced payroll sometimes assume same-day submission is workable; a properly run provider sets this expectation clearly during onboarding rather than letting it become a surprise on the first pay run.

What happens when an error is caught after processing

An underpayment typically requires an immediate off-cycle correction run, since wage payment timing is legally regulated in most jurisdictions — you generally can't just wait until the next regular cycle to make an employee whole. An overpayment is usually corrected in the next regular pay cycle with the employee's agreement, rather than an immediate clawback, both for practical reasons and because unilateral deduction from a future paycheck carries its own legal restrictions in many jurisdictions.

Frequently asked questions

Further reading and official resources

• Payroll outsourcing services: the complete guideBroader scope, pricing, and provider selection.
• US DOL: Fair Labor Standards ActOfficial federal wage and overtime rules underlying payroll calculations.