Rule

Eight-year retention

Invoices, receipts, payments and bookings are not deleted automatically while your space runs. They carry the eight-year retention duty for accounting documents.

Accounting documents have to be kept for eight years. Selfdesk therefore does not delete them by itself. A nightly sweep clears other data once its window has passed but leaves the tax-relevant records standing.

Not deleted automatically	Swept after its window
invoices, kiosk and guest receipts	the person link in the door log
payments	the audit log
contracts and contract documents	consent evidence
reservations, room bookings, kiosk purchases	withdrawn import rows and closed deletion requests

What follows from that:

When a member deletes their account, their invoices do not disappear. The person link is anonymised, the documents stay. Anything else would tear your bookkeeping apart.
You are responsible for retention, not Selfdesk. Pull the documents out regularly instead of relying on access.
When a space is deleted for good, the receipts stay locked. That happens six months after it became inactive, or 30 days after you deleted it yourself. Nobody sees them in Selfdesk any more, your members neither. Ask at hilfe@selfdesk.app and we send them to you as a ZIP. At the end of the eight years, counted from the end of the year of the newest receipt, Selfdesk deletes them. See Cancel the trial or the subscription.
The monthly export delivers a ZIP with all invoices, kiosk and guest receipts of a month as PDFs plus a CSV list. Missing PDFs are produced along the way.
The month is the document date, not the billed period. The membership invoice for the coming month is created in the current one and booked there.
Every export is logged. It is a bulk access to the invoice data of all members.
Incoming invoices do not run through Selfdesk. Your rent, your electricity and your payment provider's statement come from elsewhere.

What is stored for how long is described in What is stored and for how long.