Catch up on two years of overdue Dutch taxes

A user who was two years behind had Claude untangle expenses, find receipts and invoices, and handle Dutch tax filings in one afternoon. · May 1, 2026

What They Did

The user built an automated accounting system around Claude that pulled in two years of transactions from three bank accounts, scraped email to match receipts and invoices, categorized expenses, calculated what was owed and when, and generated reports in Dutch tax-agency box format for an accountant. They also had Claude do deep research on their specific Dutch tax situation and compile it into a knowledge-base wiki, then used that context to flag ambiguities and draft questions for the accountant rather than relying on Claude alone.

How It Went

They say it cleared a two-year backlog in one afternoon, should reduce future quarterly summaries to a single CLI command taking about five minutes, and had already saved them thousands of euros. It still surfaced 19 questions for the accountant, and commenters warned the output needed careful checking.

Worth Knowing

The main catch is verification: even after automating the work, they still sent 19 edge cases and ambiguities to their accountant.