Claude Code checks a read-only Moneybird VAT return
Braadbaart reports that Claude Code found tax-label and unmatched-payment issues in his quarterly Moneybird review through read-only MCP; he fixed them and filed the return himself.
Suggested prompt
Suggested prompt written by Agents In Use, not the source author. Replace bracketed inputs and review tool permissions first.
Review [quarter] through read-only Moneybird access. Trace discrepancies to the underlying records and show your calculations. Do not change entries or submit anything; I will resolve flagged issues and request a recheck.
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Sourced account- Source author
- Jonas Braadbaart
- Original account
- Read the source ↗
- Published
- Source link checked
- Reported result
- Braadbaart reports that Claude Code found tax-label and unmatched-payment issues in his quarterly Moneybird review through read-only MCP; he fixed them and filed the return himself.
- Human involvement
- Braadbaart deliberately keeps MCP read-only, fixes every issue himself and submits the filing. The source does not independently establish tax compliance or a universal replacement for professional advice.
A linked account supports attribution. It does not mean we independently reproduced its result.
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How the agent did it
- Let accounting software process recurring records through its own tools.
- Give Claude Code read-only Moneybird MCP access.
- Inspect quarterly records and the prepared statement for discrepancies.
Jonas Braadbaart uses Claude Code as a review layer over Moneybird for his business's quarterly administration. Moneybird processes recurring invoices and transactions through its own automations. Claude receives read-only access through the first-party MCP server, so it can inspect records without changing the books.
In the most recent reported review, the agent flags wrongly selected tax percentages, incorrectly applied tax, payments without corresponding bookings and a service line needing different treatment. Braadbaart resolves those issues manually. Claude then performs its own calculations to check the prepared statement, and he submits the filing through the accounting software.
The source describes a completed review-and-fix cycle, not an autonomous accountant or a general guarantee of tax compliance. Its reported monthly savings and hour-per-quarter workload are personal observations. The useful separation is that specialised software handles processing, the agent inspects evidence and discrepancies, and the owner owns corrections and submission. This entry records the author's workflow rather than prescribing tax treatment for a reader's jurisdiction. The suggested prompt consequently asks for traceable discrepancies and calculations while preserving the same read-only boundary.
Prompt
Suggested prompt (written by Agents In Use, not the author's)
Source: Blog · Jonas Braadbaart
Frequently asked questions
Who processes incoming invoices?
Moneybird’s own automations process and tag recurring invoices and transactions; the source explicitly separates that from Claude’s review.
Can Claude edit the books?
No. The author configures the Moneybird MCP server as read-only.
Who resolves errors and files?
Braadbaart fixes flagged issues manually and submits the return after the agent’s recheck.
More details
Remaining steps
- Have the owner fix flagged issues in the accounting software.
- Recheck calculations and let the owner submit the return.
About this account
Claude Code retrieves financial administration through MCP, identifies inconsistencies and recalculates the prepared statement, without modifying or submitting it.
Firsthand account by Jonas Braadbaart; original publication date verified against Primary Substack Sep 14, 2026. Outcomes are the author’s reports, not independently reproduced. Suggested prompt written by Agents In Use; not the author’s original prompt.
Credit: Jonas Braadbaart
Source published
Added to Agents In Use
Source checked
Tools and topics
Claude Code · Read-only Moneybird MCP · Moneybird accounting records
Quarterly review · Read-only financial checks · Human corrections
Editorial completeness: 100/100. Measures documented fields, not agent performance or verified outcomes.