What is after-the-fact payroll?

After-the-fact payroll is payroll processing performed after employees have already been paid, typically to calculate proper withholdings, create payroll records, and prepare tax deposits and filings when the employer paid employees without using a payroll system. For professional service firms that paid employees informally, after-the-fact payroll creates compliant records.

Key characteristics

• Processes payroll retroactively

• Calculates proper withholdings

• Creates required records

• Prepares tax deposits

• More complex than standard payroll

• Often done when transitioning to formal payroll

Why it matters for professional service firms

Paying employees without proper payroll processing creates compliance gaps. After-the-fact payroll reconstructs required records and enables proper tax filing. Professional service firms should use proper payroll processing from the start to avoid after-the-fact complexity.

Real-world example

Kevin paid employees by check without calculating withholdings for the first quarter. Engaged payroll service for after-the-fact processing: entered all payments made, calculated what withholdings should have been, created payroll records, and determined tax deposits owed plus penalties for late deposit. Total tax liability: $18,400 plus $920 penalty. Transitioned to proper payroll going forward.