We cannot tell your friend definitively. There are many variables to consider. Such as the difference in pay from moving. The exact location in CA they are moving into. Tax bracket. And future plans. But I can give some high-level suggestions on what to consider.
It sounds like your friend will have a higher salary in CA than in NC. This is likely to be true. But you need to consider the additional costs proportional to those salary gains and determine if you find yourself progressing ahead or falling behind financially.
Again, I don’t know where in CA your friend plans to locate. But that’s fine. I’ll just pick San Francisco to demonstrate my point. And SF isn’t too off-base here of an assumption, for it is the hottest location for tech in the state.
First, consider the fact that the average rent in SF is $3,306 where as in Durham, NC it is only $1,810. That is a $17,952/yr price difference alone.
Second, consider income taxes. CA is #1 at 7.75%. NC is 5.25%. Since you mentioned TX, it is 0% — something to keep in mind.
Third, consider capital gains tax. Predictably, again, CA is #1 at 13.3%. NC at 5.25%. TX at 0%.
Fifth, consider home ownership. Average cost of a home in SF is $1.61 million. The rest of the Bay Area is no too far off from this price. Durham, NC is at $398K and Austin, TX at $676K.
Sixth, consider federal tax bracket. If your pay increases, you may move into a new tax bracket. The jump from one bracket to the next can be significant.
So, given these numbers, I’d hope your friend gets a nice pay bump from the move. Else, I am afraid, the numbers don’t work out too well in their favor.
You also need to consider politics. The Bay Area is the country’s most Democratic metropolitan enclave. Progressivism is the prevailing ideological strain. The electorate is a Democratic super majority. Your friend has to be fine with this if they want to fit in.
You also need to consider the homelessness. It’s prolific. Doesn’t matter now if you are in SF, San Diego, LA, or any other major city at this point in CA. But this can be balanced with other positives from the state, such as its amazing natural beauty.
Hope this helps you out with your decision making.