# Checkout-driven scheduling

Source: https://lemon.cy/glossary/checkout-driven-scheduling/  
Publisher: Lemon.cy (Red Tribe Media Ltd, Limassol, Cyprus)  
Updated: 2026-09-10 · Verified against production: 2026-09-10

**Short answer:** The principle that only a booking's checkout determines the cleaning job. A change to the check-in alone never resets a job, never drops a confirmed cleaner and never fires a "dates changed" message, because the clean happens on the day the guest leaves.

Checkout-driven scheduling is rule 4 of Lemon's sync and the reason its booking identity is anchored on the checkout date (rule 1). Forward-trims move the check-in daily; merges move the check-in; a guest arriving a day late moves the check-in. None of those change when the flat needs to be cleaned. In the 30 days to 2026-09-10 Lemon logged 67 check-in-only changes that did nothing to any job, against 29 checkout changes that rescheduled one.

The principle also decides what a cleaner is told. A check-in change produces no message, because nothing about the cleaner's day changed; a checkout change produces one message with the old and new time. Late checkouts are the one exception in the same direction: the checkout stays on the same day but the start time moves, so the cleaner receives the new time and is asked to acknowledge it.

## Related

- [Turnover](https://lemon.cy/glossary/turnover/)
- [Forward-trim](https://lemon.cy/glossary/forward-trim/)
- [What happens to the cleaning job when a guest gets a late checkout or extends?](https://lemon.cy/learn/late-checkout-and-guest-extension-handling/)