How to politely withdraw from a final stage interview

[Stressednc]

I have a final stage interview scheduled for this week Friday. After reflecting on the second interview I realised it’s not the right fit for me, and it doesn’t seem worth leaving my current role for.

We’re very short staffed too and it’d be hard to get time off work anyway

Does anyone have tips for phrasing a polite apologetic email back, should I include an excuse eg been given another job offer or keep it vague like ‘due to a change in circumstances, no longer available to attend’ and then just apologise for the inconvenience

I’m maybe overthinking but I don’t want to burn bridges or break professional etiquette

I’d just say reflecting on the first interview you don’t feel it’s the right job for you and that you wish to withdraw. No need for excuses, they can unravel.

I’d thank them for their time and the opportunity to be involved in the process so far. Say that regretfully you are not in a position to proceed any further and are therefore not available for interview, apologise for any inconvenience that this may cause.

Absolutely this. It is the truth. Sooner the better just to give someone else the chance and for them to do their admin, and for it to free your mind. You won't go for another role there so no bridges burned unless you are in a very niche market. The only exception worth a thought is a) if you have someone coaching you through the interviews from within, who maybe was invested (whether by a bonus for recruiting or just wanted to help) or b) from an agency who may tire of you not being a serious contender. I actually had a) situation, someone I considered a friend who had wanted to join from a competitor, lots of friendliness, did the coaching and the chats, did the research on who was interviewing, wished them luck, never heard anything more. Wasn't a biggie, was busy at the time and never gave it much more thought, but found out later internally that they were wanting too much money, so could not be offered the job, they went to a competitor. Never contacted me again. Got to admit, I felt a bit used. In this instance, a 2 second whatsapp to say "isn't going to work for me" might have been the thing.

Very polite but don’t give reasons/excuses.
I’d thank them for their time but, on reflection, you no longer wish to proceed further in the recruitment process and therefore will be cancelling your upcoming interview.
Wish them well in their recruitment

Honestly, I’d just keep it simple and professional rather than making up an excuse like another job offer. Something vague like “after careful consideration I’ve decided not to continue with the process due to a change in circumstances” is completely fine, then thank them for their time and apologise for any inconvenience. You won’t be burning bridges at all, it’s much better to withdraw now than go through the final interview when you already know the role isn’t right for you.

There is absolutely no reason to lie.

Years ago, I accepted a job then got a better more interesting offer!

I wrote to the original company and politely turned it down. No excuses, just said I’d given it thought & decided it wasn’t the right role for me.
No harm done.

Think this is perfect. An interview is an opportunity for both parties to see if they’re a good fit, completely normal to realise it isn’t right role for you having got more of an idea of what it entails.

I agree no excuses, be polite, and acknowledge any inconvenience. If you've recognised the job is not for you, in a way you are being considerate for them.

If it one where you can phone to let them know and then follow up, would seem better in my opinion.