I have a friend who is wanting me to mow their town home complex. It would just be the one job, but over time I would be willing to look into adding a couple more. I was told that if I make $400/yr. I need to claim it on taxes, so I am considering getting a tax i.d. number as this job will pay about 3-4K/season. If I get an i.d. how much can I write off in taxes. I figure it would help pay for start up costs, including a mower, trimmer, etc. Ideas on this part of the business?