Practically all the same data that I would give to an accountant. Bank transactions and the fiscal year-end balance, receipts for expenses accumulated during the year, and additionally all transactions from Nordnet. I also provided previous years’ financial statements and materials as a template. It didn’t take much effort since the corresponding materials were already ready. It also generated charts of accounts, journals, etc., which allowed me to verify what had actually happened during the bookkeeping process.
And I should also note that I have a non-calendar fiscal year, so the official baptism of fire for the AI accountant is still ahead this summer. The tests based on the previous year’s materials were so convincing that I decided to terminate my previous accounting firm right away.