AI Bookkeeping Agent Developer (n8n, Xero, QuickBooks, OpenAI)

I run a UK accountancy practice and am looking to build an AI-powered bookkeeping workflow using n8n.

The objective is not to replace bookkeepers, but to automate the majority of transaction coding while escalating uncertain items for review.

The system should work with both Xero and QuickBooks and follow a client-specific "bookkeeping blueprint" which contains coding rules, VAT treatment, known suppliers and account mappings.

The ideal outcome is a workflow that can automatically process a large proportion of bookkeeping transactions, ask questions when required, learn from responses and then complete the bookkeeping process.

Preferred stack:

n8n
OpenAI and/or Claude
Xero API
QuickBooks API
Microsoft 365 / Teams integration

I am open to suggestions if there is a better architecture.

Required Workflow
1. Transaction Retrieval

Retrieve transactions from:

Xero
QuickBooks

Potentially:

Bank feeds
Purchase invoices
Sales invoices
Receipts

2. Bookkeeping Blueprint

The system should use a client-specific blueprint which we will provide for each client containing information such as:

Chart of accounts
VAT rules
Known suppliers
Director expense rules
Payroll rules
Account mappings
Typical coding decisions
Escalation rules

3. Transaction Classification

The agent should:

Categorise transactions
Suggest nominal codes
Suggest VAT treatment
Provide a confidence score
Record reasoning

4. Human Review Process

When confidence is below a defined threshold:

The system should generate a question and send it to a team member via:

Microsoft Teams
Email
Other suitable option

Example:

"Payment of £127.50 to Amazon could relate to software, office supplies or equipment. Please confirm."

5. Wait for Response

The workflow must pause and wait for a response.

Once a response is received, the workflow should continue automatically.

6. Post Transactions

After confirmation:

Post transaction
Update bookkeeping records
Maintain audit trail

7. Learning Capability

The system should store previous decisions so future coding improves.

Examples:

Supplier → account code
Supplier → VAT treatment
Common bookkeeping decisions
User corrections

I would like advice on the best approach for this.

8. Review & Exception Reporting

Generate reports identifying:

Uncoded transactions
Duplicate transactions
VAT anomalies
Suspicious postings
Items requiring review
Important Requirements
Audit trail
Human-in-the-loop review
Confidence scoring
Scalable across multiple clients
Secure handling of accounting data
UK bookkeeping and VAT awareness
Developer Requirements

Please apply only if you have experience with:

n8n
AI agents or workflow automation
Xero API
QuickBooks API
Accounting or bookkeeping workflows

Bonus if you have:

Worked with accountancy firms
Built finance automation systems
Experience with RAG/vector databases
Experience with Microsoft 365 integrations
Proposal Requirements

Please include:

Relevant examples of similar projects.
Recommended architecture.
Suggested tech stack.
Potential risks or limitations.
Estimated phase-based delivery plan.
Whether you would use n8n or recommend an alternative, and why.