Asking my advisor about our lab’s funding situation It seems like funding in the lab in which I am working is getting tight. Since I usually end up spending a fair amount of said funding to buy supplies for the lab and my coworkers, it’d be nice to have an accurate picture of the lab’s financial situation so that I can make more informed decisions.

I’ve pretty directly indicated to my adviser that I’m interested in more details about how the funding situation in the lab is, but it seems my adviser doesn’t want to talk about it. On the couple cases I’ve mentioned it, they’ve avoided directly talking about it or have given me very vague and not very useful responses. I'm sure there's always a great deal of uncertainty in the future of the funding situation, but it would feel helpful to know where we stand at the present moment if nothing else.

I’m currently self-funded, so I’m not particularly concerned about losing my job or anything. I’m sure my adviser would tell me before things got too crazy bad, but I’d just rather not be so in the dark about these things. How unusual is it for advisers to hide this info from their students? Would it be appropriate / inappropriate for me to push further? I realize that funding is probably a somewhat sore and frustrating subject for many professors.
The cultures differ on this point. In some countries, a PI's lab is a bit like his "private" business, or an extension of his/her house. The success of the lab fully depends on the PI's recognition, achievements, and sheer luck with the funding bodies. Naturally, PIs can be over-protective about what happens in "their kingdom", particularly if things are not going well (do they ever?)

In other places the Lab "belongs" to a University, and PI's simply inhabit it, just like postdocs, PhD students and technicians. They have some academic powers and are still responsible for finding the money to keep the place running, but the management powers are to a large extent taken away by HRs, Finance's, Senior Management, etc. It is often, but not always, lead to a better transparency, because University acts in the best interests of all employers, or at least tries to make it look like this. However, in this case PIs may not be fully aware what the situation with their funding is, particularly if University is not doing well.

In theory, as someone working in the Lab, you are a stakeholder and have all the rights to know what's going on and how long the place will run. In practice, the situation can be terribly unpredictable, and even you PI may not know what is going to happen.