[hand] in {one's} (notice|resignation)

to inform one's employer of one's intentions of leaving one's job after a certain period of time

I decided to hand in my notice at the company after accepting a new job offer.
She met with her boss to hand in her resignation and discussed her last working day with the company.
After years of dedicated service, he handed in his notice to retire and spend more time with his family.
He realized that his current job wasn't aligned with his career goals, so he officially handed in his resignation letter.
The team was surprised when Jane suddenly handed in her notice.