How quickly do I need to complete Form I-9?
Within 3 business days of the employee's start date — this is a firm federal deadline, not a suggestion.
Do I need a payroll provider, or can I run payroll myself?
You can run payroll manually, but most small businesses find a payroll provider worthwhile once they have even one employee — it handles tax withholding, remittance, and filing deadlines automatically.
What happens if I miss a payroll tax deadline?
The IRS charges penalties and interest on late payroll tax deposits, and they escalate the longer the delay continues — this is one area where staying on schedule matters a lot.
Is this checklist different if I'm in Canada?
Yes — see the Canada version of this checklist, which covers TD1 forms, CPP/EI remittances, and T4 filing instead.