If it's an issue that only an expat faces or will face, then yes. And similarly moving home is like being an expat for the second time.
For example, recent-expats may have questions about filing tax return from overseas if they still need to do so, now that they're no longer living in that country.
However, rather than a blanket statement, as there's always likely to be exceptions, basically - once again, follow the guide of - if the problem faced is not unique to an expat, it's possibly off topic. Of course no harm in asking, it can always be closed if off-topic as the site evolves. There's also the chat to ask in, if you don't feel it's suitable for the site, although it's not as busy a chat room as some of the other sites...yet.