Switching payroll providers mid-year: a checklist
Changing providers mid-year is common and safe when year-to-date data moves cleanly. Here is what to gather and when.
- 01
Pick the right start date
The cleanest switch is at the start of a quarter, so quarterly returns are filed by one provider. A mid-quarter switch works too, but both providers must agree on who files what.
- 02
Gather year-to-date data
Export YTD wages, taxes withheld, and deductions for every employee, including anyone terminated this year, so W-2s are complete. You also need prior quarterly returns (941 and state) for the current year.
- 03
Collect tax account details
List federal and state withholding account numbers, state unemployment account numbers and rates, and any local tax IDs. Missing accounts are the most common cause of delays.
- 04
Confirm deductions and garnishments
Benefit deductions, 401(k) elections, and active garnishment orders all need to be set up before the first run.
- 05
Run a parallel payroll
Run one cycle in both systems and match net pay, taxes, and deductions to the cent before you go live.
General information, not legal or tax advice. Rules change; confirm current requirements with the relevant agency or your advisor.