If a company wants to make you an offer and they ask how much you make now

[Will Collier]

It's best to politely decline to answer that question, as most have noted above. One example, I once made the mistake of providing my salary history to a company I was applying for as a courtesy, but had no intention of actually working for (long story that isn't worth going into in detail). They wound up repaying that courtesy by using that history to lowball my rate with the subcontractor which I did go to work for.

Live and learn... I learned to ignore that kind of request, and that I was correct in not wanting to work for that company in the first place.