Reminders should come from records
A reminder is strongest when it is tied to the last confirmed service event. Otherwise it becomes a generic calendar guess.
When an invoice is confirmed, the asset's next due date should update automatically or prompt the owner for review.
Commercial reminders need categories
HVAC, fire, roof, elevator, generator, plumbing, and parking lot work do not follow one universal interval.
The owner should be able to override defaults based on vendor recommendations, property condition, and local requirements.
Do not over-notify
Small owners do not need a noisy technician dispatch system. They need clear upcoming and overdue items that can be handled with vendors.
A weekly digest plus critical due-date alerts is often more useful than constant pings.