Re: meaning of "expect" here?
Paying taxes, registering your business etc are all the things that you can reasonably expect to have to do in order to fulfil all the requirements of starting a job in the US. It is simply warning you that there is a long list of things to do (register as a business, get a certificate, apply for a permit) and you may as well prepare yourself now for the fact that it is a very long list and you must expect to do all of them before you can start to work.
Originally Posted by hossein31
I think "presto change-o" is used ironically here. As you say, the change does not happen suddenly. In fact, it takes a long time and a lot of work so actually the sudden impressive change seen in a magic act is a long way from the truth in this scenario. The piece says that "most states say you've automatically turned yourself into a business". There is clearly nothing automatic about it!
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.