Claude reconciles a tax return against TurboTax
Former PwC tax professional Geoffrey Doempke used Claude to organize source records, build traceable return calculations and compare the result with TurboTax.
doempke.com
Suggested prompt
Suggested prompt written by Agents In Use, not the source author. Replace bracketed inputs and review tool permissions first.
Extract each tax document into a source-linked working file, ask me about ambiguous items, and keep every calculation traceable to its input. Flag uncertainties and prepare a review copy; do not sign or file anything.
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Sourced account- Source poster / publisher
- Geoffrey Doempke
- Original account
- Read the source ↗
- Published
- Source link checked
- Reported result
- Doempke reports that his Claude-assisted return reconciled to the dollar with TurboTax, while he caught an incorrect filing-status selection before anything was mailed.
- Human involvement
- Doempke is an experienced tax professional. He reviewed the extracted material, compared the return against TurboTax and caught a filing-status error before mailing; Claude did not file the return.
A linked account supports attribution. It does not mean we independently reproduced its result.
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How the agent did it
- Place wage forms, 1099s, brokerage records, tax instructions and blank forms in a working folder.
- Ask Claude to classify each document and extract figures into plain-text files that can be inspected.
- Add relevant bank, card and order-history exports; resolve ambiguous transactions through follow-up questions.
Geoffrey Doempke, a former individual tax professional at PwC, tested Claude on his own 2025 return. He placed wage forms, 1099s, a brokerage summary and blank IRS forms with their instructions in a folder. Claude classified the documents, extracted figures into plain-text working files and asked follow-up questions when bank, credit-card and order-history records were ambiguous.
Doempke and Claude also built a workbook with live formulas so he could trace each return figure, plus a small page for signing PDFs. Claude noticed a health-insurance detail that prompted him to retrieve another form, and it identified a deduction approach he then researched. When a form-filling skill marked his filing status as “Married Filing Separately” instead of “Single,” he caught the error before anything was mailed.
He prepared the return separately in TurboTax and reports that the two results reconciled to the dollar. The author says the comparison surfaced useful differences, but he does not claim Claude filed the return. His tax experience and review were central to the process; the post describes his own workflow, not a verified method for preparing someone else’s taxes. The reusable idea is to preserve source links and formula-level traceability, then compare any agent-produced return against an independent filing path before signing.
Prompt
Suggested prompt (written by Agents In Use, not the author's)
Source: Blog · Geoffrey Doempke
Frequently asked questions
Did Claude submit the tax return to the IRS?
No. Doempke says he used TurboTax as the filing engine and was unwilling to rely on browser automation to submit a return.
What error did Doempke catch?
A form-filling skill selected “Married Filing Separately” instead of “Single.” He caught it before mailing anything.
How did he check Claude’s result?
He prepared the return separately in TurboTax and reports reconciling the two calculations to the dollar.
More details
Remaining steps
- Build formula-linked return workbooks and supporting documentation, then reconcile the result with an independent filing tool.
About this account
Claude classified supplied documents, extracted figures, asked follow-up questions about ambiguous records and helped build traceable workbooks and supporting files.
Original article by Geoffrey Doempke opened and read on 2026-10-18; the article identifies him as a former PwC individual tax professional and describes his own return. Claude’s output contained a filing-status error that the author caught; the return was compared with TurboTax and not submitted by Claude. Suggested prompt written by Agents In Use; the source did not publish the original working prompt.
Credit: Geoffrey Doempke
Source published
Added to Agents In Use
Source checked
Tools and topics
Claude · Local tax documents · Plain-text working files · Spreadsheet · TurboTax
Tax preparation · Document extraction · Human review
Editorial completeness: 100/100. Measures documented fields, not agent performance or verified outcomes.