All of you who are workcamping as self-employed "1099" employees, be aware that as Bethers mentioned, you DO have to pay estimated income taxes four times a year. (There is a form on
www.irs.gov to do this.)
If you underestimate and wait until they are due in April, you might get walloped not only with a big tax bill but a penalty as well!
I had a penalty a couple of years ago when I worked several self-employed bits and pieces of jobs throughout the year, and it totaled up to a lot more taxes than I expected. I had not estimated anything, thinking the amount was going to be small. Both fed and state of Michigan penalized me--money wasted because I was too lazy to estimate.
When I worked almost entirely as a self-employed person several years ago, I did a much better job of estimating. My situation in the last 2-3 years is complicated because I work one regular job and one part-time job, and was doing some freelance work in my "spare" time. Nice to make lots of money, but not nice to have a penalty. Just got lazy recently, but have learned my lesson! Also, not doing any more freelancing right now, so problem is solved at least for me.