Claude vs ChatGPT for Tax Prep: Account Terms, Modes, Folders

This piece compares Anthropic's Claude and OpenAI's ChatGPT for prep work, starting with the account and the job. The question people ask is which one is better for tax. On its own, that question has no useful answer. A return is many small jobs. For each one, start with the account the work runs under.

This piece lines the two up on the points a CPA or EA firm checks before client data goes near either one. Those are account terms, the working modes each vendor names, and folder access. It uses only the vendor statements quoted below. Read each quote within its stated scope. Whichever tool drafted the first pass, the Reviewer still reviews the workpaper and signs off.

For the Claude side on its own, with each Claude product mapped to prep tasks, start with Claude for tax preparation. This piece is the side-by-side.

Account terms, side by side

Start here, because it decides the rest.

Anthropic. Anthropic's page on model training says: "This article is about our commercial products such as Claude for Work and the Anthropic API." It then says: "We will not use your chats or coding sessions to train our models, unless you choose to participate in our Development Partner Program."

OpenAI. OpenAI's business data page says: "We don’t train our models on your organization’s data by default."

Read both lines for their scope. Anthropic's is about its commercial products and names an opt-in program as the exception. OpenAI's is about your organization's data and says "by default." Don't read either line as covering an account type it doesn't name. And both are about training, which is one question among several. Who can see the data, how long it is kept, and where it sits are others, and this piece quotes no vendor line on them.

So the practical step is the same for both vendors. Name the account type your Firm approves for client work. Read that vendor's current terms for that account. Then confirm whether anyone at the Firm has opted into something that changes the default.

Modes each vendor names

The two quotes below cover different scopes: one names modes, the other names plan availability.

ChatGPT. OpenAI's ChatGPT quickstart page says: "Select Chat to ask questions, explore ideas, and work through a topic conversationally. Select Work to research, analyze information, and create documents, presentations, spreadsheets, Sites, or other finished work."

Claude Cowork. Anthropic's Cowork help page says: "Cowork is available to paid Claude plans (Pro, Max, Team, Enterprise) only."

These quotes don't describe the same thing, so don't line them up as rivals feature by feature. OpenAI's line is about two modes inside ChatGPT. Anthropic's line is about which plans include Cowork. This piece quotes no OpenAI plan line, so check which ChatGPT account your Firm has before anyone plans around Work.

For prep, the split that matters is the one inside your office: a conversation versus a task that produces a file someone keeps. A quick question about a document set is one kind of job. A draft schedule, letter or comparison headed for a workpaper is another. For that kind, whichever mode produced it, require a citation row and name the person who checks it.

Folder access

Both vendors describe file access.

Claude. Anthropic's Cowork help page says: "On desktop, Claude can read from and write to your local files without manual uploads or downloads."

ChatGPT. OpenAI's ChatGPT quickstart page says: "ChatGPT can read and modify files in the folder you choose."

Both lines include writing or modifying, not only reading. For a tax practice, that is the part to read twice. A client folder holds originals the Firm may need to produce later. Point either tool at a copy of one client's folder for one period, never at the original and never at a parent folder that holds other clients. Write down which folder each tool gets, and who chose it.

Which fits which job, under which account

There's no winner to declare here. Match the job to the account your Firm approved, and keep the checks the same. The four tasks below are office procedure. Each one ends in a draft the Preparer checks.

Folder inventory. On a Doe practice folder, ask for a list of every file: name, document type, issuer, period and page count, with duplicates and out-of-period items flagged. Either vendor's folder line above is the relevant one. The Preparer confirms each line against a real file.

Figures with citations. Ask for every figure with its source file and page, with "could not find it" allowed as an answer. The full request and the check that follows it are in the citation piece. Apply the same check to both tools.

Missing-items request. Give the tool the organizer checklist and the confirmed inventory for Jane Doe. Ask for a plain request to the client listing what the checklist expects and the inventory doesn't show. The Preparer edits it and decides what goes out.

Readback before sign-off. Whichever tool drafted an entry, a person reads it back against its source before the Reviewer sees it. How that readback runs is laid out in the readback piece.

If your Firm approves one vendor's business account and not the other's, the client-work answer is already made: use the approved one, and keep the other to Doe files. If both are approved, pick per task and keep the same checks for both. A tool that feels easier to use doesn't earn fewer checks.

Guardrails that apply to both

Write these down before anyone opens a live client folder. Switching vendors changes none of them.

1. Name the account. One approved account type per vendor, chosen after reading its current terms. Personal accounts stay out of client folders.
2. Scope the folder. A copy of one client's folder for one period. Check each cited file against the named client and period.
3. Practice on Doe files first. Run every new prompt on a Doe Holdings practice folder, revise it, then check the output again.
4. Require citation rows. No figure without its source file and page.
5. Name who checks. The Preparer checks drafts against their sources. The Reviewer reviews the workpaper and signs off. What the Reviewer needs from the file is laid out at for reviewers.
6. Keep the trail in the workpaper. Choose where the Firm keeps its workpaper of record, and save the supporting trail there: the prompt, the citation rows and the checker's initials.

What stays with people and the tax software

Picking a vendor changes none of the following steps. For this example workflow, compute the return in the Firm's tax software. Assign a Preparer to enter the checked figures. Assign a Reviewer to review the workpaper and record sign-off. Check each draft against its sources before adding it to the workpaper.

Where TracePrep fits

In TracePrep's Reasonable Compensation Study, every figure traces to its source, occupation, geography, and period, at field level. A Reviewer signs off on each Study, and the audit log records who prepared it, who changed what, and who approved it. Finalized evidence stays with the Firm.

This is general information, not tax or legal advice. Your licensed professional and your Firm's Reviewer are responsible for every return and every conclusion. Keep client data inside the systems your Firm has approved. As general guidance only, not advice: if you use an AI tool with client data, firms generally look for a business or commercial plan whose terms cover how that data is handled; read the vendor's current terms before you do.

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