Is it a good idea to ask an interviewer what the salary range is for a position after you told them your current salary? If so, how would you approach doing this?
Never share your present wage. It's none of their business.
They may not do it, but it gives them every opportunity to reduce your salary from what you might have gotten.
Best response is to know your value on the market, how much you value your time, and try to find out how much they're getting paid. Then you negotiate your rate with them having as much knowledge as possible. You can ask what they pay their current people, but you'll have to take it with a little more salt than usual.
If you have already told them what you make now, your best bet is to clearly indicate that with position change you also expect a noticeable step up in compensation, to compliment the next step in your career growth. Do not ask what the range is.
Knowing what the salary range is is important to you in making the decision to accept the job if it's offered to you. Why this seems to be taboo is something I've never understood. I see no problem with asking what the salary range is. That information is one of the most important factors in deciding to accept a job. I personally try to find this out before participating in interviews. I don't want to waste my time nor the interviewers time. If their salary range doesn't meet what I'm willing to accept then I explain that to them and politely decline the offer to interview for the position.
Unfortunately, you've tipped your hand by telling them your current salary. If your current salary happens to be on the low end of their range then they may offer you nothing more than a token increase over what you're currently making, so you may have effectively "low-balled" yourself. If they ask, redirect the question by telling them that you're more interested in understanding what their salary range is rather than in discussing your own salary.
Know what your skill set is worth in the current market and know what similar jobs are paying in your area before going into interviews. Your best "weapon" in negotiating your salary is knowing what you, or someone with similar skills and experience, is worth in the market.
I wouldn't ask what the salary range is at an interview, that would however be a question I'd ask a recruitment consultant if they contacted me and I was interested.
It's a good idea to check up on salary ranges using one of the many sites like payscale so that you know your worth if an interviewer asks you what your expectations are.
Just because they know your existing salary range doesn't mean you need to accept an offer at the same level if you are wanting more.
Ask them what the expected salary and benefits for that position is. If they low ball you just tell them you aren't interested at that pay but that you would be interested at $x. The trick here is to know what $x you are willing to accept and sticking to it.
I know people say to never answer the question of what you are making now; and in general I agree with that. However just revealing your existing pay doesn't mean you can't negotiate a higher pay.
You are still in control of whether you accept their offer.