# Payroll migration checklist: switch providers without breaking W-2s

[Home](/) / [Checklists](/checklists) / [Payroll](/checklists/payroll) / Payroll migration

By [Arthur Teboul](/authors/arthur-teboul), Founder, DokuTrak. Published 2026-11-03, updated 2026-11-03.

> **In brief:** A payroll migration checklist covers moving payroll to a new provider: exporting the old records, authorizing the new provider, loading year-to-date wages and checking the first live run. Get the exports before the old account closes, because the business must keep those records for years.

## The checklist: Payroll migration checklist

Send the export list to the client and the old provider as soon as the switch date is set. Tick the cutover and go-live lines in order.

### Plan the switch

- [ ] Switch date set: Start of a year or a quarter where possible.
- [ ] Written split of who files the switch quarter and the W-2s
- [ ] Old provider’s notice period and access end date noted

### Export before access ends

- [ ] Payroll registers for every pay date of the year
- [ ] Quarterly Forms 941 and state returns filed this year
- [ ] Year-to-date totals per employee and per tax
- [ ] Prior-year Forms W-2, W-3 and Form 940
- [ ] Deposit history and any open IRS or state notices
- [ ] Employee master data and leave balances
- [ ] Recent pay statements as a check on the exports

### Collect from the client

- [ ] State withholding and unemployment account numbers
- [ ] Latest state unemployment rate notice
- [ ] Signed Form 8655 for the new provider
- [ ] Direct deposit forms for any employee with missing bank data
- [ ] Social Security card for any SSN that fails validation

### Cutover and go-live

- [ ] Employees, rates and deductions loaded
- [ ] Year-to-date wages loaded per employee
- [ ] Parallel run matched employee by employee
- [ ] First live deposit confirmed in EFTPS
- [ ] Net pay confirmed on the payroll bank statement
- [ ] Payroll liabilities in the books tied to the new provider’s report
- [ ] Old provider’s filing authority ended after its last period
- [ ] All exports archived with the employment tax records

Download: [PDF](https://dokutrak.com/downloads/pseo-v2/f5-checklists/payroll/migration.pdf) · [Word](https://dokutrak.com/downloads/pseo-v2/f5-checklists/payroll/migration.docx) · [Excel tracker](https://dokutrak.com/downloads/pseo-v2/f5-checklists/payroll/migration.xlsx)

## Pick the switch date with the tax forms in mind

Put simply, **payroll migration** is the move of payroll from one provider, or from spreadsheets, to another system, with the history the new system needs to keep the year’s forms right.

Form 941 is the quarterly return for withheld income tax and both shares of social security and Medicare tax ([IRS, About Form 941, Employer’s Quarterly Federal Tax Return](https://www.irs.gov/forms-pubs/about-form-941)). So the cleanest start is the first payroll of a calendar year: the old provider files the last quarter and the Forms W-2, and the new one starts from zero.

The next best is the first payroll of a quarter, so each Form 941 comes from one system. A mid-quarter switch works too, but only if both sides agree in writing who files that quarter’s returns and who issues the year’s Forms W-2.

## What to export from the old provider

Access to the old account often ends with the contract. The business still has to keep employment tax records for at least 4 years ([IRS Publication 15 (2026), Circular E, Employer’s Tax Guide](https://www.irs.gov/publications/p15)), so download everything before the last day, such as the registers, the returns and the deposit history.

| Export | Why you need it |
| --- | --- |
| Payroll registers for every pay date this year | They are the source of the year-to-date totals you load. |
| Quarterly Forms 941 and state returns filed this year | They prove what was already reported for each quarter. |
| Year-to-date totals by employee and by tax | Gross pay, taxable wages per tax, withholding, deductions. |
| Prior-year Forms W-2, W-3 and Form 940 | Answers to employee and IRS questions about last year. |
| Deposit history and open notices | Shows which liabilities are paid and which are still open. |
| Employee master data | Addresses, pay rates, W-4 elections, deductions, bank details. |
| Leave balances and benefit elections | Rarely on the tax reports, easily lost in a switch. |

## Authorize the new provider and keep the liability in view

A provider that files and deposits for the client is a reporting agent: a **reporting agent** is a payroll service that acts under the employer’s EIN once the employer signs Form 8655 ([IRS Publication 15 (2026), Circular E, Employer’s Tax Guide](https://www.irs.gov/publications/p15)).

Signing it does not move the liability. Publication 15 states that an employer using a payroll provider remains liable for its employment taxes ([IRS Publication 15 (2026), Circular E, Employer’s Tax Guide](https://www.irs.gov/publications/p15)). The employer can still log in to EFTPS to confirm the deposits made on its behalf ([IRS Publication 15 (2026), Circular E, Employer’s Tax Guide](https://www.irs.gov/publications/p15)).

States have their own authorization forms. Ask the client for each state account number and the latest unemployment rate notice, since the new provider needs both before the first run.

## Load year-to-date wages so the limits and W-2s stay right

Year-to-date wages are what stop the social security tax at the right point. For 2026 the wage base is $184,500 ([IRS Publication 15 (2026), Circular E, Employer’s Tax Guide](https://www.irs.gov/publications/p15)). If the new system starts each employee at zero in the middle of the year, it will withhold past that base.

An acquisition adds its own rule. A **successor employer** is a business that buys another and keeps its employees, and when the purchase meets the IRS conditions, the seller’s wages count toward the wage base as if the buyer paid them ([IRS Publication 15 (2026), Circular E, Employer’s Tax Guide](https://www.irs.gov/publications/p15)).

Who files Forms W-2 after a sale follows Rev. Proc. 2004-53, which the W-2 instructions point to ([IRS, General Instructions for Forms W-2 and W-3 (2026)](https://www.irs.gov/instructions/iw2w3)). Transferred employees also give the buyer new Forms W-4 unless that procedure’s alternative applies ([IRS Publication 15 (2026), Circular E, Employer’s Tax Guide](https://www.irs.gov/publications/p15)).

## Run one payroll in both systems

A parallel run is the best test you have. Compute the same pay date in the old and new systems and compare them employee by employee before any money moves.

Differences usually trace back to a setup field, for example a deduction marked pre-tax in one system and after-tax in the other, or a state code. Fix the setup, not the output.

1. Load employees, rates, deductions and year-to-date totals.
2. Run one pay date in both systems from the same timesheets.
3. Compare gross pay, each tax, each deduction and net pay per employee.
4. Fix every difference in the setup and rerun until they match.
5. Release the first live payroll from the new system only.

## After the first live payroll

Check that the deposit for the first run shows up in EFTPS under the business EIN, and that each employee received net pay in the right account.

Then close the loop with the old provider. End its filing authority after its last period, keep the exports with the payroll records and reconcile the liability accounts in the books to the new provider’s tax report.

The exports hold Social Security numbers and bank details for every employee. Move them through a secure channel, in line with the safeguards in [IRS Publication 4557](/blog/irs-publication-4557).

## Questions people ask

### When is the best time to switch payroll providers?

The start of a calendar year is simplest, because one system produces all of the year’s returns and Forms W-2. The start of a quarter is the next best. A mid-quarter switch needs a written split of who files what.

### What reports should I download from the old payroll provider?

Download the registers for each pay date of the year, the quarterly and state returns, year-to-date totals per employee, last year’s Forms W-2 and Form 940, the deposit history, any open notices and the employee master data.

### Who files Form 941 for the quarter of the switch?

Either provider can, as long as one return covers the whole quarter for the EIN. Agree in writing which one files, and give that provider the other’s registers for the quarter.

### Do year-to-date wages carry over to the new provider?

They should be loaded by hand or by import for each employee. Without them, the new system restarts tax limits at zero and the W-2 shows only part of the year.

**Not advice.** This page is general information, not tax, legal or HR advice. Rules change: check the cited source and ask your own professional before you rely on it. Last reviewed October 25, 2026.

## Sources

- [IRS Publication 15 (2026), Circular E, Employer’s Tax Guide](https://www.irs.gov/publications/p15): Sets the 2026 social security rate and wage base, the monthly and semiweekly deposit schedules, the $100,000 next-day rule, the FUTA deposit rule, Form W-4 timing, Form 8655 and the 4-year record rule for employment taxes.
- [IRS, General Instructions for Forms W-2 and W-3 (2026)](https://www.irs.gov/instructions/iw2w3): Forms W-2 for 2026 go to employees and, with Form W-3, to the SSA by February 1, 2027; e-filing is required at 10 or more information returns; Forms 941 should agree with Form W-3; Rev. Proc. 2004-53 governs who files after a business sale.
- [IRS, About Form 941, Employer’s Quarterly Federal Tax Return](https://www.irs.gov/forms-pubs/about-form-941): Employers use Form 941 to report income tax and the employee and employer shares of social security and Medicare taxes.

## More on this topic

- [Payroll checklist](/checklists/payroll)
- [Payroll audit checklist](/checklists/payroll/audit)
- [Year-end payroll checklist](/checklists/year-end-close/payroll)
- [Voided check: what it is](/documents/voided-check)

## About the author

Arthur Teboul (Founder, DokuTrak) is building DokuTrak after watching professionals lose hours chasing clients for documents over email. [Arthur Teboul](/authors/arthur-teboul).

How this page was made (methodology): it is built from the primary sources listed under Sources, and every rule and figure on it links to the source it comes from. Last updated October 25, 2026. Spotted an error or a rule that changed? [Contact us](/contact).

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