intern in Big4 no need OT ,if im not wrong.

First of All, i am not from big4, but midtier instead, but i think thing work similarly.
If at Office
Answer : I would suggest you ask the senior whether is there any urgent thing need help if you have the job booking on that day. If she /he does not have urgent task for you, i guess you can leave first.

If at client place
Answer : try ask your senior whether can you back first , or anything urgent that need you to help up on the day. Otherwise try ask the senior whether they still need you or not when you already completed your section AWP.

For me:
If let say got dinner / dates, i will just tell the senior , i would like to leave early today due blablabla. (*provided you go client place by your own, not car pooling with the senior)

But it is better to stay up and help up other team member's work even though you already completed those section allocated to you. (especially during audit fieldwork period)
Just my 2cent.

Wondering if someone willing to share insight on KPMG Tax.

My uni batch mate got offer for KPMG tax. Supposed to do medical next week. BUT we just heard from friend in another Big 4 that kpmg tax department is "collapsing", bad bonuses in Feb and now some big restructuring because bosses all fighting and always blame and bully staff. Is this true or exaggeration? Sounds very scary if it's true but need to verify rumour or truth.

Now my friend big dilemma because she's still waiting for other firms to reply her but now dunno if she should do her medical now and reject kpmg if other firms offer her. If big 4 don't take her, are small firms ok? She thinking BDO maybe.

If you are from kpmg can you help confirm the situation in tax? I thought tax normally quite ok.