BUT, you can open a sole proprietorship, fill out some forms, and voila: you pay 4% taxes. After all the healthcare and stuff, you end up with 1068 euro net on a $20k (17k eur) yearly revenue.
At $48k/year, you get 3040 euro/month net. Now you're getting paid almost as much as the president. Your taxes will go up a bit next year, so save up, but for the first year you have plenty of extra money in the bank that you can leverage for making even more money.
And if you target San Francisco, you're competing with people who are asking for $130k+/year.
;)