The payment of principal is never a deductible expense. However, check the payoff information to see whether there were any fees paid in addition to principal; the fees may be considered a selling expense.
For 2007, a high deductible health plan is a health plan with an annual deductible that is not less than $1,100 for self-only coverage or $2,200 for family coverage, and with annual out-of-pocket expenses that do not exceed $5,600 or $11,200, respectively.