A missing lookup is not the same as a broken calculation
When a formula tries to compute 1 ÷ 0, the expected calculation is a division error. Wrapping it in IFERROR substitutes the displayed text Check divisor. This conclusion follows from the documented IFERROR semantics and independent reasoning; none of the destination application’s formula examples in this new guide were natively executed.
By contrast, a product lookup for SKU-999 may fail because the item isn’t in the table. A function such as IFNA, where documented, can catch #N/A while leaving division, reference and other formula errors visible. That matters when distinguishing “item not found” from “report is broken.”
Why catch-all handling can damage an audit
A common formula design is to wrap an entire sheet of calculations in IFERROR and return empty text. This makes incomplete data appear clean, and can hide missing ranges, wrong types or broken formula references. If a customer price cannot be computed, a visible error and a separate exception list may be safer than a blank cell.
| Situation | Example error type | Recommended decision |
|---|---|---|
| No match for a valid product identifier | #N/A |
Show “Not found” if an appropriate not-available-only handler exists |
| Units is 0 and unit price divides by units | #DIV/0! |
Investigate invalid denominator; show “Check divisor” only if desired |
| An expected reference was deleted | #REF! |
Repair the workbook rather than suppress the error |
Migration checklist
- Test a valid calculation as well as the failing case; IFERROR should leave valid values unchanged.
- Check a deliberately missing lookup independently of a zero-denominator test.
- Do not infer that a specific error name or code is spelled identically across all eight programs.
- Check whether the target application even documents IFNA rather than presuming equivalence.
- Record an exception count outside the IFERROR formula if suppressing an error would hide material problems.
If the failure is caused by a missing key rather than an arithmetic error, start with exact-match lookup migration.
Documentation and testing disclosure
Official vendor sources and version scopes appear beside each software candidate above. Expected outputs are independently reasoned from the shared sample; the five new comparisons do not claim native execution in any of the eight applications. Read more about how we distinguish documentation from execution in our editorial standards.