Claude to prepare two salaried tax returns
Umino used Claude Cowork to prepare tax returns for herself and her husband, both salaried workers. The source material was varied: withholding PDFs, brokerage XML, photographed insurance certificates, medical paperwork and donation records from eight municipalities.
Original prompt
Shared by the source author. See source notes for context.
確定申告を助けてほしい
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Sourced account- Source author
- ウミノ|AIとマーケティングの専門家
- Original account
- Read the source ↗
- Published
- Source link checked
- Reported result
- The author reports two prepared and filed returns totaling approximately ¥120,000 of refund amounts; actual bank receipt is not documented.
- Human involvement
- Umino authenticated and entered e-Tax herself, using prepared figures and asking about unclear screens.
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How the agent did it
- Gather salary, investment, insurance, medical and donation records in the folder.
- Have Cowork organize figures and compare them with year-end adjustments.
- Authenticate and enter the tax forms yourself, checking unclear fields with Claude.
Umino used Claude Cowork to prepare tax returns for herself and her husband, both salaried workers. The source material was varied: withholding PDFs, brokerage XML, photographed insurance certificates, medical paperwork and donation records from eight municipalities.
Cowork read the working folder and organized the amounts into Excel. Around forty scanned medical documents were part of the preparation. It also compared three ways of treating investment and dividend information and helped explain which figures belonged in the filing screens. Those comparisons were specific to the couple's documents; the account does not establish a generally best tax choice.
One useful cross-check involved insurance deductions. Her husband's year-end adjustment showed no deduction despite three insurance certificates, while her own documents already reflected an adjustment. The workflow surfaced the missing information without simply claiming the same certificates twice.
Umino performed the actual e-Tax entry. She authenticated with My Number and used the browser herself, copying prepared figures and asking Claude about confusing screens. The author reports roughly ¥78,000 for her return and ¥41,000 for her husband's, summarized as about ¥120,000 combined. The post describes the return amounts as confirmed but provides no bank-deposit date. Its roughly thirty-minute filing account also follows document collection and scanning, rather than proving the entire preparation took thirty minutes.
Prompt
Original prompt
Source: note.com · ウミノ|AIとマーケティングの専門家
Frequently asked questions
Did Cowork file the returns itself?
No. Umino handled My Number authentication and the e-Tax browser entry.
What specific omission did it find?
Her husband's documents showed no year-end insurance deduction despite three certificates, unlike her already-adjusted records.
Is the refund already a verified bank payment?
The post reports confirmed return amounts but does not supply a deposit date or bank-payment evidence.
More details
About this account
Cowork extracted tax-document information into Excel and assisted with return calculations and screen questions.
Firsthand source opened and read. Prompt is a verbatim excerpt of the published original instruction.
Credit: ウミノ|AIとマーケティングの専門家
Source published
Added to Agents In Use
Source checked
Tools and topics
Claude Cowork · Excel · PDF scans · Broker XML · e-Tax
Tax document extraction · Deduction checks · Human e-Tax entry
Editorial completeness: 100/100. Measures documented fields, not agent performance or verified outcomes.