Cancellation and reapplication
The holder or EA cancels immediately when the Singapore stint ends. An expired pass needs no cancellation, but an STVP is required while still in Singapore to avoid an overstay fine.
Apply for another Work Holiday Pass only at least twelve months after the previous pass was cancelled or expired.
Departure and cancellation steps
Check airline health/visa requirements and home-country embassy entry requirements or MFA travel guides before booking.
Cancel through Singapore EP eService in myMOM and request an STVP for up to thirty days from application if still in Singapore. It is emailed; show it and a valid passport on departure. Cut the old card in half and discard it.
Official source
Written independently from official MOM source material.