When is it best to tell your manager/boss about a job you applied for?

You don't, unless you need a reference check from them.

Otherwise there's no need to tell them until you have a confirmed job offer from the new place that you can then choose to accept or decline.

Providing you either work out your notice period, or the employer elects to pay you out straight away in lieu of notice, and return any property that belongs to the employer (clothes/uniform, devices, keys/security, vehicle, etc.) you're not bound to the old employer in any way once your tenure ends.

Ensure you clear your personal data off any devices (and from any work-based computer systems you log into), and do a full factory reset on them prior to hand-back, and if you have a vehicle get everything that's yours out of it.

If you have a private vehicle on any sort of novated lease you need to talk to the leasing provider and the new employer to see if the new employer supports novated leasing arrangements with the place your existing employer uses, otherwise start working out how to transfer the lease to a new leasing company.

Do not tell your current boss you are actively looking. Wait until you are already hired and give 2 weeks notice if possible. If your new boss wants you sooner than 2 weeks, you need to do what's best for you, not your current employer.

I always wait until I have the job offer.

Not until you are hired and on your way out the door.

When you have an accepted offer.

My recommendation for anyone is never close the door before another one opens. Else you may be trapped with no door as an option. Accept an offer before resigning from another. Or even mentioning it.

Don't tell them anything.
As long as you follow procedures outlined in your contract or employee manual that's all they're legally required to know

When ur hired and putting in notice. Don’t do it before that. They will fire you and you’ll be without a job

When you have an offer, but before you accept.

Ack. Never tell a current job about a job search. They can find out when you put in your 2 weeks notice.

When hired

When you get the offer of a new job and have a start date. Would they give you a two weeks notice if they were letting you go? It is a courtesy to give them two weeks, nothing more.

When you've decided to leave no matter what. Assuming you need or want to work, the smart thing to do is wait until you have accepted a new position and have a start date.

After you have the new joining letter in hand and have drafted your release date letter. Any shortfall of notice pay will invite penalty and hope your new employer will cover that cost.

As soon as you get the new job you need to gather papers, throw them in the air and say "fuck this shit. Im out!"

I like my managers and my coworkers. If I begin looking for a new job, it's probably something I'll bring up in conversation

When you accept the new job, and it's a sure thing. Then give a 2-week notice.

Depends on the boss and organization really... I have had some bosses that I could talk with and we talked about potential future jobs years in advance before I was ready for them and they help try to educate you.

Other bosses... it's best to tell them absolutely nothing, as they'll hold it against you, make your life harder.

So I think it all depends on the situation and people and organization involved.

Don’t do it, not even as a joke

Duh

Take a shit on his desk, he'll get the message.

When you have signed the new contract

Never tell your employer that you're seeking employment elsewhere. The day you do, is when they officially decide that you're on your way out whether you get the new job or not.

When you have been hired and putting in your two weeks.