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Replace a bookkeeper with ChatGPT guidance, then Claude Code on QuickBooks

WorkedEvidence: Described by posterPosted Last checked

Alex Willen used ChatGPT to set up books for about 200 transactions, then gave Claude Code a QuickBooks API key to post entries.

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Prompt

Original prompt

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What the prompt labels mean

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I need your help with bookkeeping. My new fund is incredibly simple financially, and I’m already tracking performance on a per-brand basis on Excel sheets, so my only bookkeeping need is to have something to give to my CPA come tax time.
So far this year I only have ~200 transactions, and moving forward I expect 30-40/month. They are basically all:
- Disbursements from my Amazon Seller accounts
- Amazon ads payments
- COGS and freight payments to suppliers
- Insurance payment
- Quickbooks payment
- One brand has a Shopify account (otherwise they’re all pure FBA), so money in from Shopify and money out to pay Shopify subscription
- Money in from investors for purchases and distributions out to investors
- Money going out to escrow for purchases of new brands
I keep talking to bookkeepers who want me to pay $500+/month and promise they’ll give me helpful financial insight yada yada yada which I don’t need or want from them. So I’m thinking I can just do this myself - it can’t be that hard, right? Since it’s just for taxes, seems like the easiest thing is to do cash accounting. Is that right? And then what else do I need to know + do here? I’ll bring you individual questions about how to handle particular transactions but for right now just give me the high level. I’m using QBO on a cheap subscription.

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ChatGPT Used in sourceGemini Grok Claude

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Optional stronger version

Our rewrite with extra checks. The poster didn't test it.

Before you start, ask me 1–3 short questions about the details below and wait for my answers. Once I've answered, confirm the plan in one line and run the whole task start to finish.

Goal: Set up and keep simple small-business books that are good enough for my CPA at tax time.

Questions to ask me first:
- Cash or accrual, and what does your CPA need at year end?
- Which transaction types make up most of your activity?
- Which accounting software and plan are you on?

Inputs (fill in or confirm):
- Business type and entity: [DETAILS]
- Transaction types: [SALES PAYOUTS / ADS / SUPPLIERS / INVESTORS / ESCROW]
- Software: [QUICKBOOKS ONLINE / OTHER]
- Year-to-date volume: [NUMBER]

Rules:
- Recommend the simplest method that is still correct for taxes, and explain the trade-offs.
- Give exact steps for account setup and each transaction type.
- Say when a menu location may differ in my software version.
- Flag anything that needs my CPA's sign-off.

Checkpoint: Show the chart of accounts and how each transaction type maps to it before I enter anything.

If you get stuck: If a transaction doesn't fit, ask for the source document instead of guessing.

Verify before you finish: Compare the P&L to platform revenue and my expected margin before sending it to the CPA.

Output: A setup checklist, a transaction mapping table and a year-end CPA package list.

Done when: My books reconcile and my CPA has what they need.

AI tools

ChatGPTClaude Code

Outcome

Alex Willen runs small Amazon e-commerce brands. After a slow Upwork bookkeeper and pitches for $500-plus monthly services, Willen asked ChatGPT (GPT-5) to walk through books for a new entity with about 200 transactions so far. ChatGPT recommended cash accounting, walked through account setup and answered every transaction question; it only got QuickBooks Online menu locations wrong. Reviewing the old books, Willen found the bookkeeper had been manually splitting Amazon fees that the CPA didn't need. The resulting P&L lined up with Amazon revenue and expected margins. Because Willen was still doing all the clicking, Willen then gave Claude Code (Opus 4.5) a QuickBooks API key, which meant creating an app and filling out a security questionnaire, so it now posts entries directly. Willen still supplies context such as escrow releases for acquisitions.

Evidence: Described by posterThe person describes what happened in words, without screenshots or video.

Source

Posted
by Alex Willen
Last checked
Method:
How we verify

https://theautomatedoperator.substack.com/p/can-ai-do-my-bookkeeping

Context: Original prompt quoted from the post. Willen calls the businesses very simple and checks the P&L before sending it to a CPA. The ChatGPT section was written around October 2025. Self-reported.

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