This is the closing step of the process outlined in From Spreadsheets to Systems: How HR Leaders Can Escape Broken, Disconnected Tooling. Run this after your new system has been live and verified, not before.

Before You Start

Confirm the replacement system has run in parallel with the spreadsheet for a full process cycle and produced matching results. Retiring a spreadsheet before that comparison is complete means you’re guessing that nothing was missed, not confirming it.

Step 1: Export the Full History

Before touching anything, export the spreadsheet in its current state, along with any version history your file storage retains. This export is your record of what the spreadsheet contained the day it was retired, and it’s the reference point if a question comes up later about historical data.

Step 2: Interview Whoever Maintained It

Sit down with the person who’s been keeping the spreadsheet running and ask them to walk through every formula, every manual adjustment, and every exception they’ve learned to handle over time. Spreadsheets patched for years almost always contain undocumented logic: a formula that accounts for a specific edge case, or a manual override for a situation the original design never anticipated.

Step 3: Document Every Piece of Undocumented Logic

Write down every exception and workaround uncovered in Step 2, in plain language, not just as a formula. Confirm the new system either handles each one automatically or has a documented manual process for it. This is the step most teams skip, and it’s the one most likely to cause a problem months later.

Step 4: Confirm the New System Handles Every Edge Case

Test the new system specifically against the exceptions documented in Step 3, not just against the standard, common-case workflow. A system that handles the typical case perfectly but fails on the edge cases the spreadsheet absorbed without anyone noticing isn’t actually ready to replace it yet.

Step 5: Archive, Don’t Delete

Move the spreadsheet to a clearly labeled archive location rather than deleting it outright. Keep it accessible for at least a full year, even after the new system takes over. This gives you a reference point if a historical question comes up that the new system, built going forward, doesn’t have data for.

Step 6: Communicate the Cutover Date

Set a specific date the spreadsheet stops being updated and announce it clearly to everyone who’s ever touched it. An ambiguous, gradual transition means people keep updating the old file “just in case,” which recreates the two-source-of-truth problem you’re trying to eliminate.

How to Know It Worked

You’ll know the retirement worked when nobody opens the old spreadsheet after the cutover date, and every edge case it used to handle shows up correctly in the new system without anyone escalating a gap. If people keep checking the old file without saying so, some piece of undocumented logic is still missing from the new system.

Common Mistakes

• Deleting instead of archiving. You’ll want the history again eventually, usually sooner than you expect.
• Skipping the maintainer interview. The person who’s been patching the spreadsheet knows exceptions nobody else does.
• Setting a soft cutover instead of a hard date. Ambiguity is what keeps a retired spreadsheet alive in practice.
• Retiring before the parallel run finishes. A partial comparison hides exactly the gaps this whole process exists to catch.

For the change management side of this transition, including how to build trust in the new system before you retire the old one, see Point Solutions vs. Integrated HR Stack: Which Fits Your Team?