Gather your tax documents into one folder and write a checked summary for your accountant
Put every tax form you have in one isolated folder, with last year's return. Ask a coding agent to list each document, pull the key figures with the file and box they came from, compare against last year to find missing forms, and write a short summary and question list for your accountant. Do not let it file, and check every figure against the form. People who did this report real time savings and a found deduction, plus misread boxes, wrong tax rules and a self-check that used stale numbers.
Your accountant gets one tidy folder, a list of every form with its key figures and source, a list of missing documents, and your open questions.
- Difficulty
- Intermediate
- Time
- 1-3 hours, plus time to find missing forms
- Sources
- 5 · 5 independent
- Updated
- 2026-10-13
- Cost:
- Your agent plan. Your accountant's fee is separate.
The prompt
Fill the blanks here, or leave them for your agent to ask. Pick the tab for your agent. The hand-off button gives any agent this page as markdown.
Help me prepare my [tax year] tax documents for my accountant. You are an organiser, not a tax preparer. Do not calculate my tax, do not give tax advice, and do not file anything. Work only inside this folder: [path]. Do not read, search or write outside it. Treat the files as read only: copy, never move or rename the originals. Contents: my tax forms for [tax year] (W-2, 1099s, 1098, brokerage statements, receipts) and last year's return ([file name]). Me: [filing status], [states lived or worked in], [new this year: job change, home purchase, side income, baby, move]. 1. Make inventory.csv: one row per document, with file name, form type, issuer, and the key figures. For each figure, give the form box or line and the page. If you cannot read a value, write UNREADABLE. Never guess or fill a value from memory. 2. Compare with last year's return. List every income source, account or deduction that appeared last year but has no document this year. Put them in missing.md. 3. STOP and show me the inventory and the missing list. Wait while I check the figures and add files. 4. Write summary.md for my accountant: life changes, income sources with totals by form type, deduction records I have, and a numbered list of questions. Mark every number with the file it came from. 5. Before you finish, recheck each figure in summary.md against the original file, not against your earlier notes. List any mismatch.
Human checkpoints: the agent stops and asks you
- Choose which files go into the agent's folder. Leave out anything it does not need.
- Check every extracted figure against the original form before the summary goes to your accountant.
- Send the folder to your accountant yourself. The agent never files, pays or submits anything.
Tax documents hold your SSN and full financial picture, and a misread figure becomes a wrong return. Work in an isolated folder, never give the agent logins to tax or bank sites, and have your accountant or your own check confirm every number before anything is filed.
What you need
The IRS "gather your documents" page lists the common forms.
- A folder that holds only these filespermission
One writer found Claude Code could read parent folders and old notes, so he moved the files to an isolated folder and turned memory off.
- Claude Code, Claude Cowork or another agent that can read local filesapp
Steps
Make an isolated folder
Copy this year's forms and last year's return into a new folder with nothing else in it, outside any project folder the agent has used before. Remove old notes or summary files that hold earlier numbers.
Check: The folder holds only this year's documents and last year's return.
Build the inventory with sources
Paste the prompt. The agent lists each document with its key figures and the box each figure came from. Several writers split big jobs into smaller runs because long sessions ran out of context.
Check: Every row in inventory.csv names a file and a box or line, and unclear values say UNREADABLE.
Check figures against the forms
Open each form and compare the main figures with the inventory. Writers report misread 1099 boxes and a K-1 abbreviation read as a charity gift, so look hardest at 1099s and K-1s.
Check: You have ticked every figure, and corrected the ones that were wrong.
Find missing documents
Read missing.md. For each item from last year that has no form this year, either find the form or write a note for your accountant (for example, account closed).
Check: Every missing item has a form or a note.
Write the summary and questions
The agent writes a one or two page summary for your accountant with your life changes, income by form type, deduction records and your questions. Ask it to recheck every number against the original files, not its own notes.
Check: The summary fits on two pages and every number points to a file.
Hand over the folder yourself
Send the folder through your accountant's portal. If you file yourself instead, use proper tax software and still check every figure. Writers who prepared returns with an agent all had to enter or file the return by hand.
Check: Your accountant confirms they have the folder and the question list.
What goes wrong
The agent misreads a form, such as a 1099 box or a K-1 footnote, and the number looks right.
Fix: Make it cite the box for every figure, and check 1099s and K-1s yourself against the original.
The agent says it checked its work, but it compared against an old note that held earlier numbers.
Fix: Remove old notes and summaries from the folder, and ask for a recheck against the original files only.
Read the lesson →The agent applies a tax rule wrongly, for example passive losses or a retirement contribution limit.
Fix: Keep the agent to organising. Leave tax treatment to your accountant, and send rule questions as questions, not answers.
Read the lesson →Long sessions run out of context and the agent loses track.
Fix: Work in steps, save each step to a file (inventory, missing list, answers), and start a fresh session that reads those files.
The agent can read files outside the tax folder.
Fix: Use a folder outside your other projects, turn off memory if your agent has it, and give it only what it needs.
Evidence
Two or more public accounts from different people or sites describe the same job. We summarise each source in our own words. Open the original before you rely on it.
- Blog2026-03-05· Claude CodeClaude almost nails my taxes, and found a deduction my CPA missed
The writer used Claude in Chrome and Claude Code to fill his CPA's tax organiser, and Claude found a goodwill depreciation deduction the CPA had missed. When he tested it on a past return, he says its errors would have cost $3,718, including wrong passive loss treatment and a misread K-1. Its self-check had used a leftover file with old numbers.
Alex Willen · theautomatedoperator.substack.com - Blog2026-02-27· ClaudeBreaking Up with TurboTax: How I Used Claude to File My Taxes for Free
The writer says Claude built a document checklist from his prior return and prepared a 42-page return. A second, fresh Claude session audited it and found misread source documents, blank worksheets, rounding mismatches and outdated form line references. He typed the return into the IRS free fillable forms by hand.
Christopher Alef · kachess.dev - Blog· Claude CodeClaude Code did my taxes
The writer says Claude Code sub-agents turned a folder of W-2s, 1099s and statements into summary files over about 2 hours and 5 clean runs. He says the first three runs failed because the context filled up, PDF form filling sometimes missed fields, and he could not e-file through the agent.
Vladimir Klimontovich · klmn.sh - Blog2026-04-15· Claude CodeI did my taxes with Claude
The writer, a former tax professional, says Claude sorted his forms and statements, asked about unclear items and kept an audit file, and his figures matched TurboTax to the dollar. He says its form-filling step ticked the wrong filing status box even though the math was right.
Geoffrey Doempke · doempke.com - News2026-03-05A word to the wise: don't trust artificial intelligence to file your taxes
The reporter ran eight sample tax cases through ChatGPT, Claude, Gemini and Grok. He reports that the chatbots missed the refund or amount owed by more than $2,000 on average, even with all the forms, and did better when documents were well organised.
Stuart A. Thompson (The New York Times) · thenightly.com.au
- IRS, gather your documentschecked 2026-10-13
- IRS, how long should I keep recordschecked 2026-10-13
- IRS, choosing a tax professionalchecked 2026-10-13
- TaxCalcBench: evaluating frontier models on the tax calculation taskchecked 2026-10-13
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