IFERROR can make a report look tidy while concealing a broken formula. Inspect the unwrapped expression before deciding which failures deserve a substitute result.
Expose the original error in a test cell
Copy the inner expression to a safe helper cell without IFERROR. Determine whether it returns a missing match, invalid reference, unsuitable value, or another error. Keep the production formula intact while investigating.
A fallback of zero can be particularly misleading in totals and performance reports. It makes a calculation failure resemble a measured zero, changing how readers interpret the data.
Use the narrowest intended handling
For an expected #N/A result, IFNA handles that error specifically. A lookup’s own missing-value argument can also express normal absence. For a zero denominator, an explicit condition explains the mathematical limitation more clearly.
IFERROR remains useful when every possible error from the wrapped expression should receive the same reviewed treatment. Document that decision, and choose a fallback whose meaning remains clear in later calculations and exports.
Test more than the successful case
Use a valid record, an intentionally missing record, and a deliberately broken reference in a test copy. Verify that expected absence receives its label while an unexpected structural failure remains detectable.
Keep an exception count or audit output if presentation cells suppress errors. A blank-looking report should not prevent maintainers from noticing that an entire source stopped working. After repairing the cause, check whether old pasted fallback values remain in downstream reports. Removing visible errors is a presentation outcome; establishing that the calculation still represents the correct inputs requires separate evidence.
References
Reviewed against the linked official product guidance on November 3, 2026. Features, limits, screen labels, and access can vary by account, platform, region, and organization policy.