HRIS Data Migration: A Step-by-Step Playbook for SMBs
- Jul 30
- 5 min read
Implementing a new Human Resources Information System (HRIS) is often touted as the "silver bullet" for organizational efficiency. It promises to automate onboarding, streamline payroll, and provide the data-driven insights your leadership team craves. However, there is a silent killer that derails more implementations than bad software or poor training: dirty data.
For small and mid-sized businesses (SMBs), data migration is the most vulnerable phase of the transition. If you move inaccurate, outdated, or poorly formatted information into a brand-new system, you aren't upgrading; you're simply relocating your headaches to a more expensive platform.
Clean data is the foundation of every successful HRIS. At JHHR, LLC, we’ve seen how a structured migration strategy can turn a high-stress transition into a seamless "go-live." This playbook walks you through the exact steps needed to migrate your data like a pro.
Step 1: Governance and Preparation
Before you export a single spreadsheet, you need a plan. Data migration isn’t just an "IT thing" or an "HR thing": it is a business-wide project.
Appoint Your Stakeholders
In an SMB, you likely don't have a dedicated "Data Migration Officer." However, you do need clear ownership. Identify a Project Lead (usually an HR Manager or Director) and a Technical Lead (someone from Ops or IT who understands how your current systems talk to each other).
Define the Scope
What exactly are you moving? Many companies make the mistake of trying to migrate twenty years of historical performance reviews and every single address change an employee ever made.
Must-Haves: Current employee profiles, tax information, emergency contacts, current salary, and benefits elections.
Nice-to-Haves: Last 2–3 years of performance data or compensation history.
Archived: Terminated employees from 10 years ago. (Keep these in a secure backup, but don't clutter your new system with them).
Step 2: The Audit & The Great Data Scrub
This is the most time-consuming part of the process, but it is also the most critical. You must inventory every data source you currently use. This includes your legacy payroll provider, scattered Excel spreadsheets, the "desk drawer" file for I-9s, and your benefits platform.
Identify Your "Source of Truth"
When you find conflicting data: for example, the payroll system says "John Smith" and the benefits file says "Jonathan Smith": which one is correct? Establish your "Source of Truth" for each data category before you begin cleaning. Usually, payroll is the most reliable for legal names and SSNs, while HR files are better for job titles and reporting lines.
Standardize the Mess
Old systems often allow for free-text entry, leading to a mess of formats. You might find "M" for Male, "Male," and "M-1" all in the same column. You need to standardize:
Dates: (MM/DD/YYYY vs DD/MM/YYYY)
Phone Numbers: (555-555-5555 vs (555) 555-5555)
States: (NY vs New York)
Job Titles: (Ensure "Sales Associate" isn't also "Sales Assoc." or "Junior Sales")
For more on how to identify these gaps, check out our guide on how to audit your HR tech stack.
Step 3: Mapping the Logic
Once your data is clean, you have to tell it where to go. Every HRIS has a different structure. Your old system might have a single field for "Address," but your new one might require "Street Address 1," "Street Address 2," "City," "State," and "Zip Code" to be separate.
Create a Crosswalk Document
This is essentially a map that links Source Field A to Target Field B.
Transformation Rules: If you are moving from a system that used codes (e.g., Dept 101) to one that uses names (e.g., Marketing), your mapping document must include the rule: "Change 101 to Marketing."
Picklists: Ensure the "drop-down" options in your new HRIS match your cleaned data. If your new system only offers "Full-Time" and "Part-Time," but your data has "Contractor," you need to decide how to handle those records before the import.
Proper mapping is one of the critical HRIS settings most consultants miss during configuration. Getting this right prevents "orphaned" data that doesn't show up in reports after launch.
Step 4: Sandbox and Sandbox Again
Never, under any circumstances, should your first data import be into your live production environment.
The Test Import
Use a "Sandbox" or "Staging" environment provided by your HRIS vendor. Take a representative sample of your data: perhaps 10–15% of your employees: and run a test import.
What to Look For:
Data Truncation: Did long job titles get cut off?
Formula Errors: Did the system correctly calculate tenure or PTO accruals based on the hire dates you imported?
Permissions: Can managers see the data they are supposed to see? Can employees see things they shouldn't?
If the test import fails or produces weird results, go back to Step 2 or 3. It is much easier to fix a spreadsheet than it is to bulk-delete 500 records from a live system.
Step 5: The Safety Net (Parallel Payroll Cycles)
If your HRIS includes a payroll module, the stakes are significantly higher. A mistake in data migration could mean someone doesn't get paid or gets taxed incorrectly.
Running Parallel Cycles
The industry gold standard is to run at least two parallel payroll cycles. This means you calculate payroll in your old system and your new system simultaneously.
Reconcile the Differences
You should compare the "Net Pay" for every single employee. If there is a discrepancy of even a few cents, you need to find out why. Often, it’s a small data migration error: like a missing tax checkbox or an incorrectly mapped benefit deduction. Do not turn off your old system until the two systems match 100%.
Step 6: Cutover and Go-Live
The "Cutover" is the final weekend or evening when you perform the full data migration and officially switch systems.
Blackout Period: Inform your employees that HR systems will be down for a specific window. No one should be requesting PTO or updating their address during the cutover.
Final Backup: Take one last "snapshot" of your legacy data.
The "Big Load": Import the full, cleaned, and tested data set into the production environment.
Validation: Run a "Headcount Report" in both systems. If the old system says you have 142 employees and the new one says 141, someone is missing. Find them before you send out the welcome emails.
Step 7: Hypercare and Support
The first 30 days after go-live are known as "Hypercare." Even with the best preparation, a few data anomalies will slip through.
Create a clear channel for employees to report issues. "My start date is wrong" or "My middle initial is missing" are common feedback items. Addressing these quickly builds trust in the new system. If employees feel the data is "wrong," they will stop using the system, and your investment will go to waste.
Continuous Improvement
Data hygiene is not a one-time event. Once you are live, establish clear processes for how data is entered moving forward. An HRIS is only as good as the information you put into it.
Ready to Navigate Your Migration?
Data migration is a daunting task for any SMB, but you don't have to do it alone. At JHHR, LLC, we specialize in HRIS Implementation and fractional HR support. We’ve guided dozens of companies through the complexities of state-specific compliance and technological transitions.
Whether you are choosing your first HRIS or migrating from a legacy platform that no longer serves your needs, our certified experts can help ensure your data is clean, your system is compliant, and your team is ready for the future.
Contact JHHR, LLC today for a consultation and let's build your scalable HR infrastructure together.
Comments