You get to "write off" all of the above via your LLC reimbursements, the valid expenses. BTW (watch your Schedule C computers above $1,000, you are supposed to depreciate at that level). The only difference is the "tax planning" (in quotes on purpose this time). You pay 15% in Self Employment tax to be able to defer your taxes, not eliminate them. There is a lot of "hocus pocus" with those selling retirement plans. I can speak directly as to having been talked into such "defined benefit plans" myself, which go over-funded and taxed horribly. I just prefer to keep things as simple as possible, and to keep payments to others at a minimum. Good Luck!