Foreign Housing Deduction
It's a deduction on your foreign housing / utilities for self-employed individuals working overseas. You have to be making over $80k for it to kick in (because you can't deduct parts of the 80k twice). You also can't deduct more than you make (obviously).
There are some calculations on that page, but I believe they only apply to your foreign housing exclusion (provided by your employer) which you don't have, since you are self-employed.