Trace Formula Errors in an Inherited Workbook with Claude for Excel
What the source describes
Anthropic's documentation describes Claude for Excel as an add-in for Pro, Max, Team and Enterprise plans that brings Claude into Excel. It can answer questions about an open workbook with cell-level citations, adjust assumptions while keeping formula relationships intact, identify errors and their root causes, and work across multi-tab workbooks. It can also sort, filter, edit pivot tables and add data validation dropdowns. The documentation warns that files from external sources can contain hidden instructions that try to manipulate the add-in, and says to start with a trusted copy before asking Claude to edit widely.
Result or outcome
According to the source, Claude asks you to confirm before it runs a risky operation, and Anthropic recommends reviewing changes before finalizing, being specific about what you want changed, and checking outputs against your organization's standards and your own judgment.
How to run it
- Make a copy of the inherited workbook and work only in the copy, as Anthropic advises starting from a trusted copy before broad edits.
- Install the Claude for Microsoft 365 add-in from Microsoft AppSource (Get it now), sign in with a Pro, Max, Team or Enterprise plan, and open the copy.
- Paste the prompt on this page into the Claude sidebar, with the schedule type and the trial balance figure filled in.
- Use the cell citations in Claude's answer to check each problem it reports, and approve fixes one at a time.
- Read every confirmation before you allow a change, then recheck the tie-out total once the fixes are in.
Try it yourself
Copyable prompt
This workbook is [client]'s [schedule, e.g. fixed asset and depreciation schedule], built by someone else. Before changing anything: 1. Map the workbook: list each tab, what it does, and which tabs feed which, with cell references. 2. Find every error value (#REF!, #N/A, #VALUE!, #DIV/0!), every number typed inside a formula, every formula that breaks the pattern of its row or column, and every total that leaves out rows. For each, give the cell, what is wrong, the root cause and a proposed fix. 3. Check that [key total, e.g. ending net book value] ties to [amount from the trial balance]. Do not edit any cells yet. Wait for me to approve each fix by cell reference.
Replace the [bracketed] placeholders. Remove client names, account numbers, and personal data before pasting into any AI tool.
What to review
Check each proposed fix in the cell itself, because a formula that clears an error can still point at the wrong range. If the workbook came from outside your firm, watch for hidden instructions, as Anthropic warns, and refuse any action that sends data elsewhere or deletes sheets. Keep a list of changed cells.
Related free download: 50 AI Prompts for Bookkeepers (Prompt pack (PDF))
Source: Claude Docs (Claude for Excel)
Not professional advice. This is general information, not accounting, tax, legal or financial advice. Check AI output yourself and consult a licensed professional for your situation. See our Terms of Use.
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