Can students bargain over admission date? Currently, I am a history student (MA) from Europe. I plan to pursue further education in Asia. 

Initially, I applied to university X (a 2-year research program (MA) with full funding). I also applied for a 1-year language acquisition program (also with full funding). I was shortlisted by uni X and accepted for the language program. I, then, wanted to withdraw from the uni x's shortlist, but my potential supervisor encouraged me to stay on the list and wait for a final decision.

However, after some thinking I realised that I look out to take that language program for academic (learn an extra language), personal (get some time off) and financial reasons (save some money)

My question is the following: do I, as a (potential) admitted student, have certain bargaining power to delay my possible admission for a year for example?

I'm not a potential employee, post-doc or whatsoever. I'm just a potential research student and I'm definitely not the only candidate on the waiting list

Which points do I have to consider prior to send an e-mail to uni X when dealing with such an issue?

Thanks
delay my possible admission for a year


In theory, yes, you can delay the admission for up to a year but you need to know the rules. 

As mentioned in the comments, this is called deferring. Each university/institute has certain rules regarding the deferment. At some places, you may not be able to defer the offer so long. While others, which allow the deferments for up to a term or two, it might be easier to delay for one semester/term (4 to 6 months) by providing a reasonable excuse. However, this can be extended for one more term (3 to 6 months) but in special cases and may require the agreement of the prospective supervisor, HoD etc. 


  Which points do I have to consider prior to send an e-mail to uni X when dealing with such an issue?


Try to know their rules through the website or by email. 

See what is the maximum period (P) they can allow you? 4+3=7 or 6+6=12 or ...

Does (P) satisfy you? 

If yes, then what would be the special conditions for the extension?

Would you be able to manage to deal with those special conditions?